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mpv/demux/demux_mkv.c

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/*
* Matroska demuxer
* Copyright (C) 2004 Aurelien Jacobs <aurel@gnuage.org>
* Based on the one written by Ronald Bultje for gstreamer
* and on demux_mkv.cpp from Moritz Bunkus.
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <float.h>
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdbool.h>
#include <math.h>
#include <assert.h>
#include <libavutil/common.h>
#include <libavutil/lzo.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/avstring.h>
#include <libavcodec/avcodec.h>
#include <libavcodec/version.h>
#include "config.h"
#if HAVE_ZLIB
#include <zlib.h>
#endif
#include "mpv_talloc.h"
#include "common/av_common.h"
#include "options/m_config.h"
#include "options/m_option.h"
#include "misc/bstr.h"
#include "stream/stream.h"
#include "video/csputils.h"
#include "video/mp_image.h"
#include "demux.h"
#include "stheader.h"
#include "ebml.h"
#include "matroska.h"
#include "codec_tags.h"
#include "common/msg.h"
static const unsigned char sipr_swaps[38][2] = {
{0,63},{1,22},{2,44},{3,90},{5,81},{7,31},{8,86},{9,58},{10,36},{12,68},
{13,39},{14,73},{15,53},{16,69},{17,57},{19,88},{20,34},{21,71},{24,46},
{25,94},{26,54},{28,75},{29,50},{32,70},{33,92},{35,74},{38,85},{40,56},
{42,87},{43,65},{45,59},{48,79},{49,93},{51,89},{55,95},{61,76},{67,83},
{77,80}
};
// Map flavour to bytes per second
#define SIPR_FLAVORS 4
#define ATRC_FLAVORS 8
#define COOK_FLAVORS 34
static const int sipr_fl2bps[SIPR_FLAVORS] = { 813, 1062, 625, 2000 };
static const int atrc_fl2bps[ATRC_FLAVORS] = {
8269, 11714, 13092, 16538, 18260, 22050, 33075, 44100 };
static const int cook_fl2bps[COOK_FLAVORS] = {
1000, 1378, 2024, 2584, 4005, 5513, 8010, 4005, 750, 2498,
4048, 5513, 8010, 11973, 8010, 2584, 4005, 2067, 2584, 2584,
4005, 4005, 5513, 5513, 8010, 12059, 1550, 8010, 12059, 5513,
12016, 16408, 22911, 33506
};
enum {
MAX_NUM_LACES = 256,
};
typedef struct mkv_content_encoding {
uint64_t order, type, scope;
uint64_t comp_algo;
uint8_t *comp_settings;
int comp_settings_len;
} mkv_content_encoding_t;
typedef struct mkv_track {
int tnum;
uint64_t uid;
char *name;
struct sh_stream *stream;
char *codec_id;
char *language;
int type;
uint32_t v_width, v_height, v_dwidth, v_dheight;
bool v_dwidth_set, v_dheight_set;
double v_frate;
uint32_t colorspace;
int stereo_mode;
struct mp_colorspace color;
uint32_t a_channels, a_bps;
float a_sfreq;
float a_osfreq;
double default_duration;
double codec_delay;
int default_track;
int forced_track;
unsigned char *private_data;
unsigned int private_size;
bool parse;
int64_t parse_timebase;
void *parser_tmp;
AVCodecParserContext *av_parser;
AVCodecContext *av_parser_codec;
bool require_keyframes;
/* stuff for realaudio braincancer */
double ra_pts; /* previous audio timestamp */
uint32_t sub_packet_size; ///< sub packet size, per stream
uint32_t sub_packet_h; ///< number of coded frames per block
uint32_t coded_framesize; ///< coded frame size, per stream
uint32_t audiopk_size; ///< audio packet size
unsigned char *audio_buf; ///< place to store reordered audio data
double *audio_timestamp; ///< timestamp for each audio packet
uint32_t sub_packet_cnt; ///< number of subpacket already received
/* generic content encoding support */
mkv_content_encoding_t *encodings;
int num_encodings;
/* latest added index entry for this track */
size_t last_index_entry;
} mkv_track_t;
typedef struct mkv_index {
int tnum;
int64_t timecode, duration;
uint64_t filepos; // position of the cluster which contains the packet
} mkv_index_t;
struct block_info {
uint64_t duration, discardpadding;
bool simple, keyframe, duration_known;
int64_t timecode;
mkv_track_t *track;
// Actual packet data.
AVBufferRef *laces[MAX_NUM_LACES];
int num_laces;
int64_t filepos;
struct ebml_block_additions *additions;
};
typedef struct mkv_demuxer {
struct demux_mkv_opts *opts;
int64_t segment_start, segment_end;
double duration;
mkv_track_t **tracks;
int num_tracks;
struct ebml_tags *tags;
int64_t tc_scale, cluster_tc;
uint64_t cluster_start;
uint64_t cluster_end;
mkv_index_t *indexes;
size_t num_indexes;
bool index_complete;
int index_mode;
int edition_id;
struct header_elem {
int32_t id;
int64_t pos;
bool parsed;
} *headers;
int num_headers;
int64_t skip_to_timecode;
int v_skip_to_keyframe, a_skip_to_keyframe;
int a_skip_preroll;
int subtitle_preroll;
bool index_has_durations;
bool eof_warning, keyframe_warning;
// Small queue of read but not yet returned packets. This is mostly
// temporary data, and not normally larger than 0 or 1 elements.
struct block_info *blocks;
int num_blocks;
// Packets to return.
struct demux_packet **packets;
int num_packets;
bool probably_webm_dash_init;
} mkv_demuxer_t;
#define OPT_BASE_STRUCT struct demux_mkv_opts
struct demux_mkv_opts {
int subtitle_preroll;
double subtitle_preroll_secs;
double subtitle_preroll_secs_index;
int probe_duration;
bool probe_start_time;
};
const struct m_sub_options demux_mkv_conf = {
.opts = (const m_option_t[]) {
{"subtitle-preroll", OPT_CHOICE(subtitle_preroll,
{"no", 0}, {"yes", 1}, {"index", 2})},
{"subtitle-preroll-secs", OPT_DOUBLE(subtitle_preroll_secs),
M_RANGE(0, DBL_MAX)},
{"subtitle-preroll-secs-index", OPT_DOUBLE(subtitle_preroll_secs_index),
M_RANGE(0, DBL_MAX)},
{"probe-video-duration", OPT_CHOICE(probe_duration,
{"no", 0}, {"yes", 1}, {"full", 2})},
{"probe-start-time", OPT_BOOL(probe_start_time)},
{0}
},
.size = sizeof(struct demux_mkv_opts),
.defaults = &(const struct demux_mkv_opts){
.subtitle_preroll = 2,
.subtitle_preroll_secs = 1.0,
.subtitle_preroll_secs_index = 10.0,
.probe_start_time = true,
},
};
#define REALHEADER_SIZE 16
#define RVPROPERTIES_SIZE 34
#define RAPROPERTIES4_SIZE 56
#define RAPROPERTIES5_SIZE 70
// Maximum number of subtitle packets that are accepted for pre-roll.
// (Subtitle packets added before first A/V keyframe packet is found with seek.)
#define NUM_SUB_PREROLL_PACKETS 500
static void probe_last_timestamp(struct demuxer *demuxer, int64_t start_pos);
static void probe_first_timestamp(struct demuxer *demuxer);
static int read_next_block_into_queue(demuxer_t *demuxer);
static void free_block(struct block_info *block);
static void add_packet(struct demuxer *demuxer, struct sh_stream *stream,
struct demux_packet *pkt)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
if (!pkt)
return;
pkt->stream = stream->index;
MP_TARRAY_APPEND(mkv_d, mkv_d->packets, mkv_d->num_packets, pkt);
}
#define AAC_SYNC_EXTENSION_TYPE 0x02b7
static int aac_get_sample_rate_index(uint32_t sample_rate)
{
static const int srates[] = {
92017, 75132, 55426, 46009, 37566, 27713,
23004, 18783, 13856, 11502, 9391, 0
};
int i = 0;
while (sample_rate < srates[i])
i++;
return i;
}
static bstr demux_mkv_decode(struct mp_log *log, mkv_track_t *track,
bstr data, uint32_t type)
{
uint8_t *src = data.start;
uint8_t *orig_src = src;
uint8_t *dest = src;
uint32_t size = data.len;
for (int i = 0; i < track->num_encodings; i++) {
struct mkv_content_encoding *enc = track->encodings + i;
if (!(enc->scope & type))
continue;
if (src != dest && src != orig_src)
talloc_free(src);
src = dest; // output from last iteration is new source
if (enc->comp_algo == 0) {
#if HAVE_ZLIB
/* zlib encoded track */
if (size == 0)
continue;
z_stream zstream;
zstream.zalloc = (alloc_func) 0;
zstream.zfree = (free_func) 0;
zstream.opaque = (voidpf) 0;
if (inflateInit(&zstream) != Z_OK) {
mp_warn(log, "zlib initialization failed.\n");
goto error;
}
zstream.next_in = (Bytef *) src;
zstream.avail_in = size;
dest = NULL;
zstream.avail_out = size;
int result;
do {
if (size >= INT_MAX - 4000) {
talloc_free(dest);
dest = NULL;
inflateEnd(&zstream);
goto error;
}
size += 4000;
dest = talloc_realloc_size(track->parser_tmp, dest, size);
zstream.next_out = (Bytef *) (dest + zstream.total_out);
result = inflate(&zstream, Z_NO_FLUSH);
if (result != Z_OK && result != Z_STREAM_END) {
mp_warn(log, "zlib decompression failed.\n");
talloc_free(dest);
dest = NULL;
inflateEnd(&zstream);
goto error;
}
zstream.avail_out += 4000;
} while (zstream.avail_out == 4000 && zstream.avail_in != 0
&& result != Z_STREAM_END);
size = zstream.total_out;
inflateEnd(&zstream);
#endif
} else if (enc->comp_algo == 2) {
/* lzo encoded track */
int out_avail;
int maxlen = INT_MAX - AV_LZO_OUTPUT_PADDING;
if (size >= maxlen / 3)
goto error;
int dstlen = size * 3;
dest = NULL;
while (1) {
int srclen = size;
dest = talloc_realloc_size(track->parser_tmp, dest,
dstlen + AV_LZO_OUTPUT_PADDING);
out_avail = dstlen;
int result = av_lzo1x_decode(dest, &out_avail, src, &srclen);
if (result == 0)
break;
if (!(result & AV_LZO_OUTPUT_FULL)) {
mp_warn(log, "lzo decompression failed.\n");
talloc_free(dest);
dest = NULL;
goto error;
}
mp_trace(log, "lzo decompression buffer too small.\n");
if (dstlen >= maxlen / 2) {
talloc_free(dest);
dest = NULL;
goto error;
}
dstlen = MPMAX(1, 2 * dstlen);
}
size = dstlen - out_avail;
} else if (enc->comp_algo == 3) {
dest = talloc_size(track->parser_tmp, size + enc->comp_settings_len);
memcpy(dest, enc->comp_settings, enc->comp_settings_len);
memcpy(dest + enc->comp_settings_len, src, size);
size += enc->comp_settings_len;
}
}
error:
if (src != dest && src != orig_src)
talloc_free(src);
if (!size)
dest = NULL;
return (bstr){dest, size};
}
static int demux_mkv_read_info(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
stream_t *s = demuxer->stream;
int res = 0;
MP_DBG(demuxer, "|+ segment information...\n");
mkv_d->tc_scale = 1000000;
mkv_d->duration = 0;
struct ebml_info info = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &info, &ebml_info_desc) < 0)
return -1;
if (info.muxing_app)
MP_DBG(demuxer, "| + muxing app: %s\n", info.muxing_app);
if (info.writing_app)
MP_DBG(demuxer, "| + writing app: %s\n", info.writing_app);
if (info.n_timecode_scale) {
mkv_d->tc_scale = info.timecode_scale;
MP_DBG(demuxer, "| + timecode scale: %"PRId64"\n", mkv_d->tc_scale);
if (mkv_d->tc_scale < 1 || mkv_d->tc_scale > INT_MAX) {
res = -1;
goto out;
}
}
if (info.n_duration) {
mkv_d->duration = info.duration * mkv_d->tc_scale / 1e9;
MP_DBG(demuxer, "| + duration: %.3fs\n",
mkv_d->duration);
demuxer->duration = mkv_d->duration;
}
if (info.title) {
mp_tags_set_str(demuxer->metadata, "TITLE", info.title);
}
if (info.n_segment_uid) {
size_t len = info.segment_uid.len;
if (len != sizeof(demuxer->matroska_data.uid.segment)) {
MP_INFO(demuxer, "segment uid invalid length %zu\n", len);
} else {
memcpy(demuxer->matroska_data.uid.segment, info.segment_uid.start,
len);
MP_DBG(demuxer, "| + segment uid");
for (size_t i = 0; i < len; i++)
MP_DBG(demuxer, " %02x",
demuxer->matroska_data.uid.segment[i]);
MP_DBG(demuxer, "\n");
}
}
if (demuxer->params && demuxer->params->matroska_wanted_uids) {
if (info.n_segment_uid) {
for (int i = 0; i < demuxer->params->matroska_num_wanted_uids; i++) {
struct matroska_segment_uid *uid = demuxer->params->matroska_wanted_uids + i;
if (!memcmp(info.segment_uid.start, uid->segment, 16)) {
demuxer->matroska_data.uid.edition = uid->edition;
goto out;
}
}
}
MP_VERBOSE(demuxer, "This is not one of the wanted files. "
"Stopping attempt to open.\n");
res = -2;
}
out:
talloc_free(parse_ctx.talloc_ctx);
return res;
}
static void parse_trackencodings(struct demuxer *demuxer,
struct mkv_track *track,
struct ebml_content_encodings *encodings)
{
// initial allocation to be a non-NULL context before realloc
mkv_content_encoding_t *ce = talloc_size(track, 1);
for (int n_enc = 0; n_enc < encodings->n_content_encoding; n_enc++) {
struct ebml_content_encoding *enc = encodings->content_encoding + n_enc;
struct mkv_content_encoding e = {0};
e.order = enc->content_encoding_order;
if (enc->n_content_encoding_scope)
e.scope = enc->content_encoding_scope;
else
e.scope = 1;
e.type = enc->content_encoding_type;
if (enc->n_content_compression) {
struct ebml_content_compression *z = &enc->content_compression;
e.comp_algo = z->content_comp_algo;
if (z->n_content_comp_settings) {
int sz = z->content_comp_settings.len;
e.comp_settings = talloc_size(ce, sz);
memcpy(e.comp_settings, z->content_comp_settings.start, sz);
e.comp_settings_len = sz;
}
}
if (e.type == 1) {
MP_WARN(demuxer, "Track "
"number %d has been encrypted and "
"decryption has not yet been\n"
"implemented. Skipping track.\n",
track->tnum);
} else if (e.type != 0) {
MP_WARN(demuxer, "Unknown content encoding type for "
"track %u. Skipping track.\n",
track->tnum);
} else if (e.comp_algo != 0 && e.comp_algo != 2 && e.comp_algo != 3) {
MP_WARN(demuxer, "Track %d has been compressed with "
"an unknown/unsupported compression\n"
"algorithm (%"PRIu64"). Skipping track.\n",
track->tnum, e.comp_algo);
}
#if !HAVE_ZLIB
else if (e.comp_algo == 0) {
MP_WARN(demuxer, "Track %d was compressed with zlib "
"but mpv has not been compiled\n"
"with support for zlib compression. "
"Skipping track.\n",
track->tnum);
}
#endif
int i;
for (i = 0; i < n_enc; i++) {
if (e.order >= ce[i].order)
break;
}
ce = talloc_realloc(track, ce, mkv_content_encoding_t, n_enc + 1);
memmove(ce + i + 1, ce + i, (n_enc - i) * sizeof(*ce));
memcpy(ce + i, &e, sizeof(e));
}
track->encodings = ce;
track->num_encodings = encodings->n_content_encoding;
}
static void parse_trackaudio(struct demuxer *demuxer, struct mkv_track *track,
struct ebml_audio *audio)
{
if (audio->n_sampling_frequency) {
track->a_sfreq = audio->sampling_frequency;
MP_DBG(demuxer, "| + Sampling frequency: %f\n", track->a_sfreq);
} else {
track->a_sfreq = 8000;
}
if (audio->n_output_sampling_frequency) {
track->a_osfreq = audio->output_sampling_frequency;
MP_DBG(demuxer, "| + Output sampling frequency: %f\n", track->a_osfreq);
} else {
track->a_osfreq = track->a_sfreq;
}
if (audio->n_bit_depth) {
track->a_bps = audio->bit_depth;
MP_DBG(demuxer, "| + Bit depth: %"PRIu32"\n", track->a_bps);
}
if (audio->n_channels) {
track->a_channels = audio->channels;
MP_DBG(demuxer, "| + Channels: %"PRIu32"\n", track->a_channels);
} else {
track->a_channels = 1;
}
}
static void parse_trackcolour(struct demuxer *demuxer, struct mkv_track *track,
struct ebml_colour *colour)
{
// Note: As per matroska spec, the order is consistent with ISO/IEC
// 23001-8:2013/DCOR1, which is the same order used by libavutil/pixfmt.h,
// so we can just re-use our avcol_ conversion functions.
if (colour->n_matrix_coefficients) {
track->color.space = avcol_spc_to_mp_csp(colour->matrix_coefficients);
MP_DBG(demuxer, "| + Matrix: %s\n",
m_opt_choice_str(mp_csp_names, track->color.space));
}
if (colour->n_primaries) {
track->color.primaries = avcol_pri_to_mp_csp_prim(colour->primaries);
MP_DBG(demuxer, "| + Primaries: %s\n",
m_opt_choice_str(mp_csp_prim_names, track->color.primaries));
}
if (colour->n_transfer_characteristics) {
track->color.gamma = avcol_trc_to_mp_csp_trc(colour->transfer_characteristics);
MP_DBG(demuxer, "| + Gamma: %s\n",
m_opt_choice_str(mp_csp_trc_names, track->color.gamma));
}
if (colour->n_range) {
track->color.levels = avcol_range_to_mp_csp_levels(colour->range);
MP_DBG(demuxer, "| + Levels: %s\n",
m_opt_choice_str(mp_csp_levels_names, track->color.levels));
}
if (colour->n_max_cll) {
track->color.sig_peak = colour->max_cll / MP_REF_WHITE;
MP_DBG(demuxer, "| + MaxCLL: %"PRIu64"\n", colour->max_cll);
}
// if MaxCLL is unavailable, try falling back to the mastering metadata
if (!track->color.sig_peak && colour->n_mastering_metadata) {
struct ebml_mastering_metadata *mastering = &colour->mastering_metadata;
if (mastering->n_luminance_max) {
track->color.sig_peak = mastering->luminance_max / MP_REF_WHITE;
MP_DBG(demuxer, "| + HDR peak: %f\n", track->color.sig_peak);
}
}
}
static void parse_trackvideo(struct demuxer *demuxer, struct mkv_track *track,
struct ebml_video *video)
{
if (video->n_frame_rate) {
MP_DBG(demuxer, "| + Frame rate: %f (ignored)\n", video->frame_rate);
}
if (video->n_display_width) {
track->v_dwidth = video->display_width;
track->v_dwidth_set = true;
MP_DBG(demuxer, "| + Display width: %"PRIu32"\n", track->v_dwidth);
}
if (video->n_display_height) {
track->v_dheight = video->display_height;
track->v_dheight_set = true;
MP_DBG(demuxer, "| + Display height: %"PRIu32"\n", track->v_dheight);
}
if (video->n_pixel_width) {
track->v_width = video->pixel_width;
MP_DBG(demuxer, "| + Pixel width: %"PRIu32"\n", track->v_width);
}
if (video->n_pixel_height) {
track->v_height = video->pixel_height;
MP_DBG(demuxer, "| + Pixel height: %"PRIu32"\n", track->v_height);
}
if (video->n_colour_space && video->colour_space.len == 4) {
uint8_t *d = (uint8_t *)&video->colour_space.start[0];
track->colorspace = d[0] | (d[1] << 8) | (d[2] << 16) | (d[3] << 24);
MP_DBG(demuxer, "| + Colorspace: %#"PRIx32"\n", track->colorspace);
}
if (video->n_stereo_mode) {
const char *name = MP_STEREO3D_NAME(video->stereo_mode);
if (name) {
track->stereo_mode = video->stereo_mode;
MP_DBG(demuxer, "| + StereoMode: %s\n", name);
} else {
MP_WARN(demuxer, "Unknown StereoMode: %"PRIu64"\n",
video->stereo_mode);
}
}
if (video->n_colour)
parse_trackcolour(demuxer, track, &video->colour);
}
/**
* \brief free any data associated with given track
* \param track track of which to free data
*/
static void demux_mkv_free_trackentry(mkv_track_t *track)
{
talloc_free(track->parser_tmp);
talloc_free(track);
}
static void parse_trackentry(struct demuxer *demuxer,
struct ebml_track_entry *entry)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
struct mkv_track *track = talloc_zero(NULL, struct mkv_track);
track->last_index_entry = (size_t)-1;
track->parser_tmp = talloc_new(track);
track->tnum = entry->track_number;
if (track->tnum) {
MP_DBG(demuxer, "| + Track number: %d\n", track->tnum);
} else {
MP_ERR(demuxer, "Missing track number!\n");
}
track->uid = entry->track_uid;
if (entry->name) {
track->name = talloc_strdup(track, entry->name);
MP_DBG(demuxer, "| + Name: %s\n", track->name);
}
track->type = entry->track_type;
MP_DBG(demuxer, "| + Track type: ");
switch (track->type) {
case MATROSKA_TRACK_AUDIO:
MP_DBG(demuxer, "Audio\n");
break;
case MATROSKA_TRACK_VIDEO:
MP_DBG(demuxer, "Video\n");
break;
case MATROSKA_TRACK_SUBTITLE:
MP_DBG(demuxer, "Subtitle\n");
break;
default:
MP_DBG(demuxer, "unknown\n");
break;
}
if (entry->n_audio) {
MP_DBG(demuxer, "| + Audio track\n");
parse_trackaudio(demuxer, track, &entry->audio);
}
if (entry->n_video) {
MP_DBG(demuxer, "| + Video track\n");
parse_trackvideo(demuxer, track, &entry->video);
}
if (entry->codec_id) {
track->codec_id = talloc_strdup(track, entry->codec_id);
MP_DBG(demuxer, "| + Codec ID: %s\n", track->codec_id);
} else {
MP_ERR(demuxer, "Missing codec ID!\n");
track->codec_id = "";
}
if (entry->n_codec_private && entry->codec_private.len <= 0x10000000) {
int len = entry->codec_private.len;
track->private_data = talloc_size(track, len + AV_LZO_INPUT_PADDING);
memcpy(track->private_data, entry->codec_private.start, len);
track->private_size = len;
MP_DBG(demuxer, "| + CodecPrivate, length %u\n", track->private_size);
}
if (entry->language) {
track->language = talloc_strdup(track, entry->language);
MP_DBG(demuxer, "| + Language: %s\n", track->language);
} else {
track->language = talloc_strdup(track, "eng");
}
if (entry->n_flag_default) {
track->default_track = entry->flag_default;
MP_DBG(demuxer, "| + Default flag: %d\n", track->default_track);
} else {
track->default_track = 1;
}
if (entry->n_flag_forced) {
track->forced_track = entry->flag_forced;
MP_DBG(demuxer, "| + Forced flag: %d\n", track->forced_track);
}
if (entry->n_default_duration) {
track->default_duration = entry->default_duration / 1e9;
if (entry->default_duration == 0) {
MP_DBG(demuxer, "| + Default duration: 0");
} else {
track->v_frate = 1e9 / entry->default_duration;
MP_DBG(demuxer, "| + Default duration: %.3fms ( = %.3f fps)\n",
entry->default_duration / 1000000.0, track->v_frate);
}
}
if (entry->n_content_encodings)
parse_trackencodings(demuxer, track, &entry->content_encodings);
if (entry->n_codec_delay)
track->codec_delay = entry->codec_delay / 1e9;
mkv_d->tracks[mkv_d->num_tracks++] = track;
}
static int demux_mkv_read_tracks(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
MP_DBG(demuxer, "|+ segment tracks...\n");
struct ebml_tracks tracks = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &tracks, &ebml_tracks_desc) < 0)
return -1;
mkv_d->tracks = talloc_zero_array(mkv_d, struct mkv_track*,
tracks.n_track_entry);
for (int i = 0; i < tracks.n_track_entry; i++) {
MP_DBG(demuxer, "| + a track...\n");
parse_trackentry(demuxer, &tracks.track_entry[i]);
}
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
static void cue_index_add(demuxer_t *demuxer, int track_id, uint64_t filepos,
int64_t timecode, int64_t duration)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
MP_TARRAY_GROW(mkv_d, mkv_d->indexes, mkv_d->num_indexes);
mkv_d->indexes[mkv_d->num_indexes] = (mkv_index_t) {
.tnum = track_id,
.filepos = filepos,
.timecode = timecode,
.duration = duration,
};
mkv_d->num_indexes++;
}
static void add_block_position(demuxer_t *demuxer, struct mkv_track *track,
uint64_t filepos,
int64_t timecode, int64_t duration)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
if (mkv_d->index_complete || !track)
return;
mkv_d->index_has_durations = true;
if (track->last_index_entry != (size_t)-1) {
mkv_index_t *index = &mkv_d->indexes[track->last_index_entry];
// Never add blocks which are already covered by the index.
if (index->timecode >= timecode)
return;
}
cue_index_add(demuxer, track->tnum, filepos, timecode, duration);
track->last_index_entry = mkv_d->num_indexes - 1;
}
static int demux_mkv_read_cues(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
if (mkv_d->index_mode != 1 || mkv_d->index_complete) {
ebml_read_skip(demuxer->log, -1, s);
return 0;
}
MP_VERBOSE(demuxer, "Parsing cues...\n");
struct ebml_cues cues = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &cues, &ebml_cues_desc) < 0)
return -1;
for (int i = 0; i < cues.n_cue_point; i++) {
struct ebml_cue_point *cuepoint = &cues.cue_point[i];
if (cuepoint->n_cue_time != 1 || !cuepoint->n_cue_track_positions) {
MP_WARN(demuxer, "Malformed CuePoint element\n");
goto done;
}
if (cuepoint->cue_time / 1e9 > mkv_d->duration / mkv_d->tc_scale * 10 &&
mkv_d->duration != 0)
goto done;
}
if (cues.n_cue_point <= 3) // probably too sparse and will just break seeking
goto done;
// Discard incremental index. (Keep the first entry, which must be the
// start of the file - helps with files that miss the first index entry.)
mkv_d->num_indexes = MPMIN(1, mkv_d->num_indexes);
mkv_d->index_has_durations = false;
for (int i = 0; i < cues.n_cue_point; i++) {
struct ebml_cue_point *cuepoint = &cues.cue_point[i];
uint64_t time = cuepoint->cue_time;
for (int c = 0; c < cuepoint->n_cue_track_positions; c++) {
struct ebml_cue_track_positions *trackpos =
&cuepoint->cue_track_positions[c];
uint64_t pos = mkv_d->segment_start + trackpos->cue_cluster_position;
cue_index_add(demuxer, trackpos->cue_track, pos,
time, trackpos->cue_duration);
mkv_d->index_has_durations |= trackpos->n_cue_duration > 0;
MP_TRACE(demuxer, "|+ found cue point for track %"PRIu64": "
"timecode %"PRIu64", filepos: %"PRIu64""
"offset %"PRIu64", duration %"PRIu64"\n",
trackpos->cue_track, time, pos,
trackpos->cue_relative_position, trackpos->cue_duration);
}
}
// Do not attempt to create index on the fly.
mkv_d->index_complete = true;
done:
if (!mkv_d->index_complete)
MP_WARN(demuxer, "Discarding potentially broken or useless index.\n");
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
static int demux_mkv_read_chapters(struct demuxer *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
stream_t *s = demuxer->stream;
int wanted_edition = mkv_d->edition_id;
uint64_t wanted_edition_uid = demuxer->matroska_data.uid.edition;
/* A specific edition UID was requested; ignore the user option which is
* only applicable to the top-level file. */
if (wanted_edition_uid)
wanted_edition = -1;
MP_DBG(demuxer, "Parsing chapters...\n");
struct ebml_chapters file_chapters = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &file_chapters,
&ebml_chapters_desc) < 0)
return -1;
int selected_edition = -1;
int num_editions = file_chapters.n_edition_entry;
struct ebml_edition_entry *editions = file_chapters.edition_entry;
for (int i = 0; i < num_editions; i++) {
struct demux_edition new = {
.demuxer_id = editions[i].edition_uid,
.default_edition = editions[i].edition_flag_default,
.metadata = talloc_zero(demuxer, struct mp_tags),
};
MP_TARRAY_APPEND(demuxer, demuxer->editions, demuxer->num_editions, new);
}
if (wanted_edition >= 0 && wanted_edition < num_editions) {
selected_edition = wanted_edition;
MP_VERBOSE(demuxer, "User-specified edition: %d\n", selected_edition);
} else {
for (int i = 0; i < num_editions; i++) {
if (wanted_edition_uid &&
editions[i].edition_uid == wanted_edition_uid) {
selected_edition = i;
break;
} else if (editions[i].edition_flag_default) {
selected_edition = i;
MP_VERBOSE(demuxer, "Default edition: %d\n", i);
break;
}
}
}
if (selected_edition < 0) {
if (wanted_edition_uid) {
MP_ERR(demuxer, "Unable to find expected edition uid: %"PRIu64"\n",
wanted_edition_uid);
talloc_free(parse_ctx.talloc_ctx);
return -1;
} else {
selected_edition = 0;
}
}
for (int idx = 0; idx < num_editions; idx++) {
MP_VERBOSE(demuxer, "New edition %d\n", idx);
int warn_level = idx == selected_edition ? MSGL_WARN : MSGL_V;
if (editions[idx].n_edition_flag_default)
MP_VERBOSE(demuxer, "Default edition flag: %"PRIu64"\n",
editions[idx].edition_flag_default);
if (editions[idx].n_edition_flag_ordered)
MP_VERBOSE(demuxer, "Ordered chapter flag: %"PRIu64"\n",
editions[idx].edition_flag_ordered);
int chapter_count = editions[idx].n_chapter_atom;
struct matroska_chapter *m_chapters = NULL;
if (idx == selected_edition && editions[idx].edition_flag_ordered) {
m_chapters = talloc_array_ptrtype(demuxer, m_chapters, chapter_count);
demuxer->matroska_data.ordered_chapters = m_chapters;
demuxer->matroska_data.num_ordered_chapters = chapter_count;
}
for (int i = 0; i < chapter_count; i++) {
struct ebml_chapter_atom *ca = editions[idx].chapter_atom + i;
struct matroska_chapter chapter = {0};
char *name = "(unnamed)";
chapter.start = ca->chapter_time_start;
chapter.end = ca->chapter_time_end;
if (!ca->n_chapter_time_start)
MP_MSG(demuxer, warn_level, "Chapter lacks start time\n");
if (!ca->n_chapter_time_start || !ca->n_chapter_time_end) {
if (demuxer->matroska_data.ordered_chapters) {
MP_MSG(demuxer, warn_level, "Chapter lacks start or end "
"time, disabling ordered chapters.\n");
demuxer->matroska_data.ordered_chapters = NULL;
demuxer->matroska_data.num_ordered_chapters = 0;
}
}
if (ca->n_chapter_display) {
if (ca->n_chapter_display > 1)
MP_MSG(demuxer, warn_level, "Multiple chapter "
"names not supported, picking first\n");
if (!ca->chapter_display[0].chap_string)
MP_MSG(demuxer, warn_level, "Malformed chapter name entry\n");
else
name = ca->chapter_display[0].chap_string;
}
if (ca->n_chapter_segment_uid) {
chapter.has_segment_uid = true;
int len = ca->chapter_segment_uid.len;
if (len != sizeof(chapter.uid.segment))
MP_MSG(demuxer, warn_level,
"Chapter segment uid bad length %d\n", len);
else {
memcpy(chapter.uid.segment, ca->chapter_segment_uid.start,
len);
if (ca->n_chapter_segment_edition_uid)
chapter.uid.edition = ca->chapter_segment_edition_uid;
else
chapter.uid.edition = 0;
MP_DBG(demuxer, "Chapter segment uid ");
for (int n = 0; n < len; n++)
MP_DBG(demuxer, "%02x ",
chapter.uid.segment[n]);
MP_DBG(demuxer, "\n");
}
}
MP_DBG(demuxer, "Chapter %u from %02d:%02d:%02d.%03d "
"to %02d:%02d:%02d.%03d, %s\n", i,
(int) (chapter.start / 60 / 60 / 1000000000),
(int) ((chapter.start / 60 / 1000000000) % 60),
(int) ((chapter.start / 1000000000) % 60),
(int) (chapter.start % 1000000000),
(int) (chapter.end / 60 / 60 / 1000000000),
(int) ((chapter.end / 60 / 1000000000) % 60),
(int) ((chapter.end / 1000000000) % 60),
(int) (chapter.end % 1000000000),
name);
if (idx == selected_edition) {
demuxer_add_chapter(demuxer, name, chapter.start / 1e9,
ca->chapter_uid);
}
if (m_chapters) {
chapter.name = talloc_strdup(m_chapters, name);
m_chapters[i] = chapter;
}
}
}
demuxer->num_editions = num_editions;
demuxer->edition = selected_edition;
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
static int demux_mkv_read_tags(demuxer_t *demuxer)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
stream_t *s = demuxer->stream;
struct ebml_parse_ctx parse_ctx = {demuxer->log};
struct ebml_tags tags = {0};
if (ebml_read_element(s, &parse_ctx, &tags, &ebml_tags_desc) < 0)
return -1;
mkv_d->tags = talloc_dup(mkv_d, &tags);
talloc_steal(mkv_d->tags, parse_ctx.talloc_ctx);
return 0;
}
static void process_tags(demuxer_t *demuxer)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
struct ebml_tags *tags = mkv_d->tags;
if (!tags)
return;
for (int i = 0; i < tags->n_tag; i++) {
struct ebml_tag tag = tags->tag[i];
struct mp_tags *dst = NULL;
if (tag.targets.target_chapter_uid) {
for (int n = 0; n < demuxer->num_chapters; n++) {
if (demuxer->chapters[n].demuxer_id ==
tag.targets.target_chapter_uid)
{
dst = demuxer->chapters[n].metadata;
break;
}
}
} else if (tag.targets.target_edition_uid) {
for (int n = 0; n < demuxer->num_editions; n++) {
if (demuxer->editions[n].demuxer_id ==
tag.targets.target_edition_uid)
{
dst = demuxer->editions[n].metadata;
break;
}
}
} else if (tag.targets.target_track_uid) {
for (int n = 0; n < mkv_d->num_tracks; n++) {
if (mkv_d->tracks[n]->uid ==
tag.targets.target_track_uid)
{
struct sh_stream *sh = mkv_d->tracks[n]->stream;
if (sh)
dst = sh->tags;
break;
}
}
} else if (tag.targets.target_attachment_uid) {
/* ignore */
} else {
dst = demuxer->metadata;
}
if (dst) {
for (int j = 0; j < tag.n_simple_tag; j++) {
if (tag.simple_tag[j].tag_name && tag.simple_tag[j].tag_string) {
char *name = tag.simple_tag[j].tag_name;
char *val = tag.simple_tag[j].tag_string;
char *old = mp_tags_get_str(dst, name);
if (old)
val = talloc_asprintf(NULL, "%s / %s", old, val);
mp_tags_set_str(dst, name, val);
if (old)
talloc_free(val);
}
}
}
}
}
static int demux_mkv_read_attachments(demuxer_t *demuxer)
{
stream_t *s = demuxer->stream;
MP_DBG(demuxer, "Parsing attachments...\n");
struct ebml_attachments attachments = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &attachments,
&ebml_attachments_desc) < 0)
return -1;
for (int i = 0; i < attachments.n_attached_file; i++) {
struct ebml_attached_file *attachment = &attachments.attached_file[i];
if (!attachment->file_name || !attachment->file_mime_type
|| !attachment->n_file_data) {
MP_WARN(demuxer, "Malformed attachment\n");
continue;
}
char *name = attachment->file_name;
char *mime = attachment->file_mime_type;
demuxer_add_attachment(demuxer, name, mime, attachment->file_data.start,
attachment->file_data.len);
MP_DBG(demuxer, "Attachment: %s, %s, %zu bytes\n",
name, mime, attachment->file_data.len);
}
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
static struct header_elem *get_header_element(struct demuxer *demuxer,
uint32_t id,
int64_t element_filepos)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
// Note that some files in fact contain a SEEKHEAD with a list of all
// clusters - we have no use for that.
if (!ebml_is_mkv_level1_id(id) || id == MATROSKA_ID_CLUSTER)
return NULL;
for (int n = 0; n < mkv_d->num_headers; n++) {
struct header_elem *elem = &mkv_d->headers[n];
// SEEKHEAD is the only element that can happen multiple times.
// Other elements might be duplicated (or attempted to be read twice,
// even if it's only once in the file), but only the first is used.
if (elem->id == id && (id != MATROSKA_ID_SEEKHEAD ||
elem->pos == element_filepos))
return elem;
}
struct header_elem elem = { .id = id, .pos = element_filepos };
MP_TARRAY_APPEND(mkv_d, mkv_d->headers, mkv_d->num_headers, elem);
return &mkv_d->headers[mkv_d->num_headers - 1];
}
// Mark the level 1 element with the given id as read. Return whether it
// was marked read before (e.g. for checking whether it was already read).
// element_filepos refers to the file position of the element ID.
static bool test_header_element(struct demuxer *demuxer, uint32_t id,
int64_t element_filepos)
{
struct header_elem *elem = get_header_element(demuxer, id, element_filepos);
if (!elem)
return false;
if (elem->parsed)
return true;
elem->parsed = true;
return false;
}
static int demux_mkv_read_seekhead(demuxer_t *demuxer)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
struct stream *s = demuxer->stream;
int res = 0;
struct ebml_seek_head seekhead = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
MP_DBG(demuxer, "Parsing seek head...\n");
if (ebml_read_element(s, &parse_ctx, &seekhead, &ebml_seek_head_desc) < 0) {
res = -1;
goto out;
}
for (int i = 0; i < seekhead.n_seek; i++) {
struct ebml_seek *seek = &seekhead.seek[i];
if (seek->n_seek_id != 1 || seek->n_seek_position != 1) {
MP_WARN(demuxer, "Invalid SeekHead entry\n");
continue;
}
uint64_t pos = seek->seek_position + mkv_d->segment_start;
MP_TRACE(demuxer, "Element 0x%"PRIx32" at %"PRIu64".\n",
seek->seek_id, pos);
get_header_element(demuxer, seek->seek_id, pos);
}
out:
talloc_free(parse_ctx.talloc_ctx);
return res;
}
static int read_header_element(struct demuxer *demuxer, uint32_t id,
int64_t start_filepos)
{
if (id == EBML_ID_INVALID)
return 0;
if (test_header_element(demuxer, id, start_filepos))
goto skip;
switch(id) {
case MATROSKA_ID_INFO:
return demux_mkv_read_info(demuxer);
case MATROSKA_ID_TRACKS:
return demux_mkv_read_tracks(demuxer);
case MATROSKA_ID_CUES:
return demux_mkv_read_cues(demuxer);
case MATROSKA_ID_TAGS:
return demux_mkv_read_tags(demuxer);
case MATROSKA_ID_SEEKHEAD:
return demux_mkv_read_seekhead(demuxer);
case MATROSKA_ID_CHAPTERS:
return demux_mkv_read_chapters(demuxer);
case MATROSKA_ID_ATTACHMENTS:
return demux_mkv_read_attachments(demuxer);
}
skip:
ebml_read_skip(demuxer->log, -1, demuxer->stream);
return 0;
}
static int read_deferred_element(struct demuxer *demuxer,
struct header_elem *elem)
{
stream_t *s = demuxer->stream;
if (elem->parsed)
return 0;
elem->parsed = true;
MP_VERBOSE(demuxer, "Seeking to %"PRIu64" to read header element "
"0x%"PRIx32".\n",
elem->pos, elem->id);
if (!stream_seek(s, elem->pos)) {
MP_WARN(demuxer, "Failed to seek when reading header element.\n");
return 0;
}
if (ebml_read_id(s) != elem->id) {
MP_ERR(demuxer, "Expected element 0x%"PRIx32" not found\n",
elem->id);
return 0;
}
elem->parsed = false; // don't make read_header_element skip it
return read_header_element(demuxer, elem->id, elem->pos);
}
static void read_deferred_cues(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
if (mkv_d->index_complete || mkv_d->index_mode != 1)
return;
for (int n = 0; n < mkv_d->num_headers; n++) {
struct header_elem *elem = &mkv_d->headers[n];
if (elem->id == MATROSKA_ID_CUES)
read_deferred_element(demuxer, elem);
}
}
static void add_coverart(struct demuxer *demuxer)
{
for (int n = 0; n < demuxer->num_attachments; n++) {
struct demux_attachment *att = &demuxer->attachments[n];
const char *codec = mp_map_mimetype_to_video_codec(att->type);
if (!codec)
continue;
struct sh_stream *sh = demux_alloc_sh_stream(STREAM_VIDEO);
sh->codec->codec = codec;
sh->attached_picture = new_demux_packet_from(att->data, att->data_size);
if (sh->attached_picture) {
sh->attached_picture->pts = 0;
talloc_steal(sh, sh->attached_picture);
sh->attached_picture->keyframe = true;
sh->image = true;
}
sh->title = att->name;
demux_add_sh_stream(demuxer, sh);
}
}
static void init_track(demuxer_t *demuxer, mkv_track_t *track,
struct sh_stream *sh)
{
track->stream = sh;
if (track->language && (strcmp(track->language, "und") != 0))
sh->lang = track->language;
sh->demuxer_id = track->tnum;
sh->title = track->name;
sh->default_track = track->default_track;
sh->forced_track = track->forced_track;
}
static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track);
static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track);
static int demux_mkv_open_sub(demuxer_t *demuxer, mkv_track_t *track);
static void display_create_tracks(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
for (int i = 0; i < mkv_d->num_tracks; i++) {
switch (mkv_d->tracks[i]->type) {
case MATROSKA_TRACK_VIDEO:
demux_mkv_open_video(demuxer, mkv_d->tracks[i]);
break;
case MATROSKA_TRACK_AUDIO:
demux_mkv_open_audio(demuxer, mkv_d->tracks[i]);
break;
case MATROSKA_TRACK_SUBTITLE:
demux_mkv_open_sub(demuxer, mkv_d->tracks[i]);
break;
}
}
}
static const char *const mkv_video_tags[][2] = {
{"V_MJPEG", "mjpeg"},
{"V_MPEG1", "mpeg1video"},
{"V_MPEG2", "mpeg2video"},
{"V_MPEG4/ISO/SP", "mpeg4"},
{"V_MPEG4/ISO/ASP", "mpeg4"},
{"V_MPEG4/ISO/AP", "mpeg4"},
{"V_MPEG4/ISO/AVC", "h264"},
{"V_MPEG4/MS/V3", "msmpeg4v3"},
{"V_THEORA", "theora"},
{"V_VP8", "vp8"},
{"V_VP9", "vp9"},
{"V_DIRAC", "dirac"},
{"V_PRORES", "prores"},
{"V_MPEGH/ISO/HEVC", "hevc"},
{"V_SNOW", "snow"},
{"V_AV1", "av1"},
{"V_PNG", "png"},
{"V_AVS2", "avs2"},
{"V_AVS3", "avs3"},
{0}
};
static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track)
{
unsigned char *extradata = NULL;
unsigned int extradata_size = 0;
struct sh_stream *sh = demux_alloc_sh_stream(STREAM_VIDEO);
init_track(demuxer, track, sh);
struct mp_codec_params *sh_v = sh->codec;
sh_v->bits_per_coded_sample = 24;
if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")) { /* AVI compatibility mode */
// The private_data contains a BITMAPINFOHEADER struct
if (track->private_data == NULL || track->private_size < 40)
goto done;
unsigned char *h = track->private_data;
if (track->v_width == 0)
track->v_width = AV_RL32(h + 4); // biWidth
if (track->v_height == 0)
track->v_height = AV_RL32(h + 8); // biHeight
sh_v->bits_per_coded_sample = AV_RL16(h + 14); // biBitCount
sh_v->codec_tag = AV_RL32(h + 16); // biCompression
extradata = track->private_data + 40;
extradata_size = track->private_size - 40;
mp_set_codec_from_tag(sh_v);
sh_v->avi_dts = true;
} else if (track->private_size >= RVPROPERTIES_SIZE
&& (!strcmp(track->codec_id, "V_REAL/RV10")
|| !strcmp(track->codec_id, "V_REAL/RV20")
|| !strcmp(track->codec_id, "V_REAL/RV30")
|| !strcmp(track->codec_id, "V_REAL/RV40")))
{
unsigned char *src;
unsigned int cnt;
src = (uint8_t *) track->private_data + RVPROPERTIES_SIZE;
cnt = track->private_size - RVPROPERTIES_SIZE;
uint32_t t2 = AV_RB32(src - 4);
switch (t2 == 0x10003000 || t2 == 0x10003001 ? '1' : track->codec_id[9]) {
case '1': sh_v->codec = "rv10"; break;
case '2': sh_v->codec = "rv20"; break;
case '3': sh_v->codec = "rv30"; break;
case '4': sh_v->codec = "rv40"; break;
}
// copy type1 and type2 info from rv properties
extradata_size = cnt + 8;
extradata = src - 8;
track->parse = true;
track->parse_timebase = 1e3;
} else if (strcmp(track->codec_id, "V_UNCOMPRESSED") == 0) {
// raw video, "like AVI" - this is a FourCC
sh_v->codec_tag = track->colorspace;
sh_v->codec = "rawvideo";
} else if (strcmp(track->codec_id, "V_QUICKTIME") == 0) {
uint32_t fourcc1 = 0, fourcc2 = 0;
if (track->private_size >= 8) {
fourcc1 = AV_RL32(track->private_data + 0);
fourcc2 = AV_RL32(track->private_data + 4);
}
if (fourcc1 == MKTAG('S', 'V', 'Q', '3') ||
fourcc2 == MKTAG('S', 'V', 'Q', '3'))
{
sh_v->codec = "svq3";
extradata = track->private_data;
extradata_size = track->private_size;
}
} else {
for (int i = 0; mkv_video_tags[i][0]; i++) {
if (!strcmp(mkv_video_tags[i][0], track->codec_id)) {
sh_v->codec = mkv_video_tags[i][1];
break;
}
}
if (track->private_data && track->private_size > 0) {
extradata = track->private_data;
extradata_size = track->private_size;
}
}
const char *codec = sh_v->codec ? sh_v->codec : "";
if (!strcmp(codec, "mjpeg")) {
sh_v->codec_tag = MKTAG('m', 'j', 'p', 'g');
track->require_keyframes = true;
}
if (extradata_size > 0x1000000) {
MP_WARN(demuxer, "Invalid CodecPrivate\n");
goto done;
}
sh_v->extradata = talloc_memdup(sh_v, extradata, extradata_size);
sh_v->extradata_size = extradata_size;
if (!sh_v->codec) {
MP_WARN(demuxer, "Unknown/unsupported CodecID (%s) or missing/bad "
"CodecPrivate data (track %d).\n",
track->codec_id, track->tnum);
}
sh_v->fps = track->v_frate;
sh_v->disp_w = track->v_width;
sh_v->disp_h = track->v_height;
int dw = track->v_dwidth_set ? track->v_dwidth : track->v_width;
int dh = track->v_dheight_set ? track->v_dheight : track->v_height;
struct mp_image_params p = {.w = track->v_width, .h = track->v_height};
mp_image_params_set_dsize(&p, dw, dh);
sh_v->par_w = p.p_w;
sh_v->par_h = p.p_h;
sh_v->stereo_mode = track->stereo_mode;
sh_v->color = track->color;
done:
demux_add_sh_stream(demuxer, sh);
return 0;
}
// Parse VorbisComment and look for WAVEFORMATEXTENSIBLE_CHANNEL_MASK.
// Do not change *channels if nothing found or an error happens.
static void parse_vorbis_chmap(struct mp_chmap *channels, unsigned char *data,
int size)
{
// Skip the useless vendor string.
if (size < 4)
return;
uint32_t vendor_length = AV_RL32(data);
if (vendor_length + 4 > size) // also check for the next AV_RB32 below
return;
size -= vendor_length + 4;
data += vendor_length + 4;
uint32_t num_headers = AV_RL32(data);
size -= 4;
data += 4;
for (int n = 0; n < num_headers; n++) {
if (size < 4)
return;
uint32_t len = AV_RL32(data);
size -= 4;
data += 4;
if (len > size)
return;
if (len > 34 && !memcmp(data, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK=", 34)) {
char smask[80];
snprintf(smask, sizeof(smask), "%.*s", (int)(len - 34), data + 34);
char *end = NULL;
uint32_t mask = strtol(smask, &end, 0);
if (!end || end[0])
mask = 0;
struct mp_chmap chmask = {0};
mp_chmap_from_waveext(&chmask, mask);
if (mp_chmap_is_valid(&chmask))
*channels = chmask;
}
size -= len;
data += len;
}
}
// Parse VorbisComment-in-FLAC and look for WAVEFORMATEXTENSIBLE_CHANNEL_MASK.
// Do not change *channels if nothing found or an error happens.
static void parse_flac_chmap(struct mp_chmap *channels, unsigned char *data,
int size)
{
// Skip FLAC header.
if (size < 4)
return;
data += 4;
size -= 4;
// Parse FLAC blocks...
while (size >= 4) {
unsigned btype = data[0] & 0x7F;
unsigned bsize = AV_RB24(data + 1);
data += 4;
size -= 4;
if (bsize > size)
return;
if (btype == 4) // VORBIS_COMMENT
parse_vorbis_chmap(channels, data, bsize);
data += bsize;
size -= bsize;
}
}
static const char *const mkv_audio_tags[][2] = {
{ "A_MPEG/L2", "mp2" },
{ "A_MPEG/L3", "mp3" },
{ "A_AC3", "ac3" },
{ "A_EAC3", "eac3" },
{ "A_DTS", "dts" },
{ "A_AAC", "aac" },
{ "A_VORBIS", "vorbis" },
{ "A_OPUS", "opus" },
{ "A_OPUS/EXPERIMENTAL", "opus" },
{ "A_QUICKTIME/QDMC", "qdmc" },
{ "A_QUICKTIME/QDM2", "qdm2" },
{ "A_WAVPACK4", "wavpack" },
{ "A_TRUEHD", "truehd" },
{ "A_FLAC", "flac" },
{ "A_ALAC", "alac" },
{ "A_TTA1", "tta" },
{ "A_MLP", "mlp" },
{ NULL },
};
static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track)
{
struct sh_stream *sh = demux_alloc_sh_stream(STREAM_AUDIO);
init_track(demuxer, track, sh);
struct mp_codec_params *sh_a = sh->codec;
if (track->private_size > 0x1000000)
goto error;
unsigned char *extradata = track->private_data;
unsigned int extradata_len = track->private_size;
if (!track->a_osfreq)
track->a_osfreq = track->a_sfreq;
sh_a->bits_per_coded_sample = track->a_bps ? track->a_bps : 16;
sh_a->samplerate = (uint32_t) track->a_osfreq;
mp_chmap_set_unknown(&sh_a->channels, track->a_channels);
for (int i = 0; mkv_audio_tags[i][0]; i++) {
if (!strcmp(mkv_audio_tags[i][0], track->codec_id)) {
sh_a->codec = mkv_audio_tags[i][1];
break;
}
}
if (!strcmp(track->codec_id, "A_MS/ACM")) { /* AVI compatibility mode */
// The private_data contains a WAVEFORMATEX struct
if (track->private_size < 18)
goto error;
MP_DBG(demuxer, "track with MS compat audio.\n");
unsigned char *h = track->private_data;
sh_a->codec_tag = AV_RL16(h + 0); // wFormatTag
if (track->a_channels == 0)
track->a_channels = AV_RL16(h + 2); // nChannels
if (sh_a->samplerate == 0)
sh_a->samplerate = AV_RL32(h + 4); // nSamplesPerSec
sh_a->bitrate = AV_RL32(h + 8) * 8; // nAvgBytesPerSec
sh_a->block_align = AV_RL16(h + 12); // nBlockAlign
if (track->a_bps == 0)
track->a_bps = AV_RL16(h + 14); // wBitsPerSample
extradata = track->private_data + 18;
extradata_len = track->private_size - 18;
sh_a->bits_per_coded_sample = track->a_bps;
sh_a->extradata = extradata;
sh_a->extradata_size = extradata_len;
mp_set_codec_from_tag(sh_a);
extradata = sh_a->extradata;
extradata_len = sh_a->extradata_size;
} else if (!strcmp(track->codec_id, "A_PCM/INT/LIT")) {
bool sign = sh_a->bits_per_coded_sample > 8;
mp_set_pcm_codec(sh_a, sign, false, sh_a->bits_per_coded_sample, false);
} else if (!strcmp(track->codec_id, "A_PCM/INT/BIG")) {
bool sign = sh_a->bits_per_coded_sample > 8;
mp_set_pcm_codec(sh_a, sign, false, sh_a->bits_per_coded_sample, true);
} else if (!strcmp(track->codec_id, "A_PCM/FLOAT/IEEE")) {
sh_a->codec = sh_a->bits_per_coded_sample == 64 ? "pcm_f64le" : "pcm_f32le";
} else if (!strncmp(track->codec_id, "A_REAL/", 7)) {
if (track->private_size < RAPROPERTIES4_SIZE)
goto error;
/* Common initialization for all RealAudio codecs */
unsigned char *src = track->private_data;
int version = AV_RB16(src + 4);
unsigned int flavor = AV_RB16(src + 22);
track->coded_framesize = AV_RB32(src + 24);
track->sub_packet_h = AV_RB16(src + 40);
sh_a->block_align = track->audiopk_size = AV_RB16(src + 42);
track->sub_packet_size = AV_RB16(src + 44);
int offset = 0;
if (version == 4) {
offset += RAPROPERTIES4_SIZE;
if (offset + 1 > track->private_size)
goto error;
offset += (src[offset] + 1) * 2 + 3;
} else {
offset += RAPROPERTIES5_SIZE + 3 + (version == 5 ? 1 : 0);
}
if (track->audiopk_size == 0 || track->sub_packet_size == 0 ||
track->sub_packet_h == 0 || track->coded_framesize == 0)
goto error;
if (track->coded_framesize > 0x40000000)
goto error;
if (offset + 4 > track->private_size)
goto error;
uint32_t codecdata_length = AV_RB32(src + offset);
offset += 4;
if (offset > track->private_size ||
codecdata_length > track->private_size - offset)
goto error;
extradata_len = codecdata_length;
extradata = src + offset;
if (!strcmp(track->codec_id, "A_REAL/ATRC")) {
sh_a->codec = "atrac3";
if (flavor >= MP_ARRAY_SIZE(atrc_fl2bps))
goto error;
sh_a->bitrate = atrc_fl2bps[flavor] * 8;
sh_a->block_align = track->sub_packet_size;
} else if (!strcmp(track->codec_id, "A_REAL/COOK")) {
sh_a->codec = "cook";
if (flavor >= MP_ARRAY_SIZE(cook_fl2bps))
goto error;
sh_a->bitrate = cook_fl2bps[flavor] * 8;
sh_a->block_align = track->sub_packet_size;
} else if (!strcmp(track->codec_id, "A_REAL/SIPR")) {
sh_a->codec = "sipr";
if (flavor >= MP_ARRAY_SIZE(sipr_fl2bps))
goto error;
sh_a->bitrate = sipr_fl2bps[flavor] * 8;
sh_a->block_align = track->coded_framesize;
} else if (!strcmp(track->codec_id, "A_REAL/28_8")) {
sh_a->codec = "ra_288";
sh_a->bitrate = 3600 * 8;
sh_a->block_align = track->coded_framesize;
} else if (!strcmp(track->codec_id, "A_REAL/DNET")) {
sh_a->codec = "ac3";
} else {
goto error;
}
track->audio_buf =
talloc_array_size(track, track->sub_packet_h, track->audiopk_size);
track->audio_timestamp =
talloc_array(track, double, track->sub_packet_h);
} else if (!strncmp(track->codec_id, "A_AAC/", 6)) {
sh_a->codec = "aac";
/* Recreate the 'private data' (not needed for plain A_AAC) */
int srate_idx = aac_get_sample_rate_index(track->a_sfreq);
const char *tail = "";
if (strlen(track->codec_id) >= 12)
tail = &track->codec_id[12];
int profile = 3;
if (!strncmp(tail, "MAIN", 4))
profile = 0;
else if (!strncmp(tail, "LC", 2))
profile = 1;
else if (!strncmp(tail, "SSR", 3))
profile = 2;
extradata = talloc_size(sh_a, 5);
extradata[0] = ((profile + 1) << 3) | ((srate_idx & 0xE) >> 1);
extradata[1] = ((srate_idx & 0x1) << 7) | (track->a_channels << 3);
if (strstr(track->codec_id, "SBR") != NULL) {
/* HE-AAC (aka SBR AAC) */
extradata_len = 5;
srate_idx = aac_get_sample_rate_index(sh_a->samplerate);
extradata[2] = AAC_SYNC_EXTENSION_TYPE >> 3;
extradata[3] = ((AAC_SYNC_EXTENSION_TYPE & 0x07) << 5) | 5;
extradata[4] = (1 << 7) | (srate_idx << 3);
track->default_duration = 1024.0 / (sh_a->samplerate / 2);
} else {
extradata_len = 2;
track->default_duration = 1024.0 / sh_a->samplerate;
}
} else if (!strncmp(track->codec_id, "A_AC3/", 6)) {
sh_a->codec = "ac3";
} else if (!strncmp(track->codec_id, "A_EAC3/", 7)) {
sh_a->codec = "eac3";
}
if (!sh_a->codec)
goto error;
const char *codec = sh_a->codec;
if (!strcmp(codec, "mp2") || !strcmp(codec, "mp3") ||
!strcmp(codec, "truehd") || !strcmp(codec, "eac3"))
{
mkv_demuxer_t *mkv_d = demuxer->priv;
int64_t segment_timebase = (1e9 / mkv_d->tc_scale);
track->parse = true;
track->parse_timebase = MPMAX(sh_a->samplerate, segment_timebase);
} else if (!strcmp(codec, "flac")) {
unsigned char *ptr = extradata;
unsigned int size = extradata_len;
if (size < 4 || ptr[0] != 'f' || ptr[1] != 'L' || ptr[2] != 'a'
|| ptr[3] != 'C') {
extradata = talloc_size(sh_a, 4);
extradata_len = 4;
memcpy(extradata, "fLaC", 4);
}
parse_flac_chmap(&sh_a->channels, extradata, extradata_len);
} else if (!strcmp(codec, "alac")) {
if (track->private_size) {
extradata_len = track->private_size + 12;
extradata = talloc_size(sh_a, extradata_len);
char *data = extradata;
AV_WB32(data + 0, extradata_len);
memcpy(data + 4, "alac", 4);
AV_WB32(data + 8, 0);
memcpy(data + 12, track->private_data, track->private_size);
}
} else if (!strcmp(codec, "tta")) {
extradata_len = 30;
extradata = talloc_zero_size(sh_a, extradata_len);
if (!extradata)
goto error;
char *data = extradata;
memcpy(data + 0, "TTA1", 4);
AV_WL16(data + 4, 1);
AV_WL16(data + 6, sh_a->channels.num);
AV_WL16(data + 8, sh_a->bits_per_coded_sample);
AV_WL32(data + 10, track->a_osfreq);
// Bogus: last frame won't be played.
AV_WL32(data + 14, 0);
} else if (!strcmp(codec, "opus")) {
// Hardcode the rate libavcodec's opus decoder outputs, so that
// AV_PKT_DATA_SKIP_SAMPLES actually works. The Matroska header only
// has an arbitrary "input" samplerate, while libavcodec is fixed to
// output 48000.
sh_a->samplerate = 48000;
}
// Some files have broken default DefaultDuration set, which will lead to
// audio packets with incorrect timestamps. This follows FFmpeg commit
// 6158a3b, sample see FFmpeg ticket 2508.
if (sh_a->samplerate == 8000 && strcmp(codec, "ac3") == 0)
track->default_duration = 0;
// Deal with some FFmpeg-produced garbage, and assume all audio codecs can
// start decoding from anywhere.
if (strcmp(codec, "truehd") != 0)
track->require_keyframes = true;
sh_a->extradata = extradata;
sh_a->extradata_size = extradata_len;
sh->seek_preroll = track->codec_delay;
demux_add_sh_stream(demuxer, sh);
return 0;
error:
MP_WARN(demuxer, "Unknown/unsupported audio "
"codec ID '%s' for track %u or missing/faulty\n"
"private codec data.\n", track->codec_id, track->tnum);
demux_add_sh_stream(demuxer, sh); // add it anyway
return 1;
}
static const char *const mkv_sub_tag[][2] = {
{ "S_VOBSUB", "dvd_subtitle" },
{ "S_TEXT/SSA", "ass"},
{ "S_TEXT/ASS", "ass"},
{ "S_SSA", "ass"},
{ "S_ASS", "ass"},
{ "S_TEXT/ASCII", "subrip"},
{ "S_TEXT/UTF8", "subrip"},
{ "S_HDMV/PGS", "hdmv_pgs_subtitle"},
{ "D_WEBVTT/SUBTITLES", "webvtt-webm"},
{ "D_WEBVTT/CAPTIONS", "webvtt-webm"},
{ "S_TEXT/WEBVTT", "webvtt"},
{ "S_DVBSUB", "dvb_subtitle"},
{ "S_ARIBSUB", "arib_caption"},
{0}
};
static void avcodec_par_destructor(void *p)
{
avcodec_parameters_free(p);
}
static int demux_mkv_open_sub(demuxer_t *demuxer, mkv_track_t *track)
{
const char *subtitle_type = NULL;
for (int n = 0; mkv_sub_tag[n][0]; n++) {
if (strcmp(track->codec_id, mkv_sub_tag[n][0]) == 0) {
subtitle_type = mkv_sub_tag[n][1];
break;
}
}
if (track->private_size > 0x10000000)
return 1;
struct sh_stream *sh = demux_alloc_sh_stream(STREAM_SUB);
init_track(demuxer, track, sh);
sh->codec->codec = subtitle_type;
bstr in = (bstr){track->private_data, track->private_size};
bstr buffer = demux_mkv_decode(demuxer->log, track, in, 2);
if (buffer.start && buffer.start != track->private_data) {
talloc_free(track->private_data);
talloc_steal(track, buffer.start);
track->private_data = buffer.start;
track->private_size = buffer.len;
}
sh->codec->extradata = track->private_data;
sh->codec->extradata_size = track->private_size;
if (!strcmp(sh->codec->codec, "arib_caption") && track->private_size >= 3) {
struct AVCodecParameters **lavp = talloc_ptrtype(track, lavp);
talloc_set_destructor(lavp, avcodec_par_destructor);
struct AVCodecParameters *lav = *lavp = sh->codec->lav_codecpar = avcodec_parameters_alloc();
MP_HANDLE_OOM(lav);
lav->codec_type = AVMEDIA_TYPE_SUBTITLE;
lav->codec_id = AV_CODEC_ID_ARIB_CAPTION;
int component_tag = track->private_data[0];
int data_component_id = AV_RB16(track->private_data + 1);
switch (data_component_id) {
case 0x0008:
// [0x30..0x37] are component tags utilized for
// non-mobile captioning service ("profile A").
if (component_tag >= 0x30 && component_tag <= 0x37)
lav->profile = FF_PROFILE_ARIB_PROFILE_A;
break;
case 0x0012:
// component tag 0x87 signifies a mobile/partial reception
// (1seg) captioning service ("profile C").
if (component_tag == 0x87)
lav->profile = FF_PROFILE_ARIB_PROFILE_C;
break;
}
if (lav->profile == FF_PROFILE_UNKNOWN)
MP_WARN(demuxer, "ARIB caption profile %02x / %04x not supported.\n",
component_tag, data_component_id);
}
demux_add_sh_stream(demuxer, sh);
if (!subtitle_type)
MP_ERR(demuxer, "Subtitle type '%s' is not supported.\n", track->codec_id);
return 0;
}
static void probe_x264_garbage(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
for (int n = 0; n < mkv_d->num_tracks; n++) {
mkv_track_t *track = mkv_d->tracks[n];
struct sh_stream *sh = track->stream;
if (!sh || sh->type != STREAM_VIDEO)
continue;
if (sh->codec->codec && strcmp(sh->codec->codec, "h264") != 0)
continue;
struct block_info *block = NULL;
// Find first block for this track.
// Restrict reading number of total packets. (Arbitrary to avoid bloat.)
for (int i = 0; i < 100; i++) {
if (i >= mkv_d->num_blocks && read_next_block_into_queue(demuxer) < 1)
break;
if (mkv_d->blocks[i].track == track) {
block = &mkv_d->blocks[i];
break;
}
}
if (!block || block->num_laces < 1)
continue;
bstr sblock = {block->laces[0]->data, block->laces[0]->size};
bstr nblock = demux_mkv_decode(demuxer->log, track, sblock, 1);
sh->codec->first_packet = new_demux_packet_from(nblock.start, nblock.len);
talloc_steal(mkv_d, sh->codec->first_packet);
if (nblock.start != sblock.start)
talloc_free(nblock.start);
}
}
static int read_ebml_header(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
stream_t *s = demuxer->stream;
if (ebml_read_id(s) != EBML_ID_EBML)
return 0;
struct ebml_ebml ebml_master = {0};
struct ebml_parse_ctx parse_ctx = { demuxer->log, .no_error_messages = true };
if (ebml_read_element(s, &parse_ctx, &ebml_master, &ebml_ebml_desc) < 0)
return 0;
bool is_matroska = false, is_webm = false;
if (!ebml_master.doc_type) {
MP_VERBOSE(demuxer, "File has EBML header but no doctype. "
"Assuming \"matroska\".\n");
is_matroska = true;
} else if (strcmp(ebml_master.doc_type, "matroska") == 0) {
is_matroska = true;
} else if (strcmp(ebml_master.doc_type, "webm") == 0) {
is_webm = true;
}
if (!is_matroska && !is_webm) {
MP_TRACE(demuxer, "no head found\n");
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
mkv_d->probably_webm_dash_init &= is_webm;
if (ebml_master.doc_type_read_version > 2) {
MP_WARN(demuxer, "This looks like a Matroska file, "
"but we don't support format version %"PRIu64"\n",
ebml_master.doc_type_read_version);
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
if ((ebml_master.n_ebml_read_version
&& ebml_master.ebml_read_version != EBML_VERSION)
|| (ebml_master.n_ebml_max_size_length
&& ebml_master.ebml_max_size_length > 8)
|| (ebml_master.n_ebml_max_id_length
&& ebml_master.ebml_max_id_length != 4))
{
MP_WARN(demuxer, "This looks like a Matroska file, "
"but the header has bad parameters\n");
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
talloc_free(parse_ctx.talloc_ctx);
return 1;
}
static int read_mkv_segment_header(demuxer_t *demuxer, int64_t *segment_end)
{
stream_t *s = demuxer->stream;
int num_skip = 0;
if (demuxer->params)
num_skip = demuxer->params->matroska_wanted_segment;
while (stream_read_peek(s, &(char){0}, 1)) {
if (ebml_read_id(s) != MATROSKA_ID_SEGMENT) {
MP_VERBOSE(demuxer, "segment not found\n");
return 0;
}
MP_DBG(demuxer, "+ a segment...\n");
uint64_t len = ebml_read_length(s);
*segment_end = (len == EBML_UINT_INVALID) ? 0 : stream_tell(s) + len;
if (num_skip <= 0)
return 1;
num_skip--;
MP_DBG(demuxer, " (skipping)\n");
if (*segment_end <= 0)
break;
if (*segment_end >= stream_get_size(s))
return 0;
if (!stream_seek(s, *segment_end)) {
MP_WARN(demuxer, "Failed to seek in file\n");
return 0;
}
// Segments are like concatenated Matroska files
if (!read_ebml_header(demuxer))
return 0;
}
MP_VERBOSE(demuxer, "End of file, no further segments.\n");
return 0;
}
static int demux_mkv_open(demuxer_t *demuxer, enum demux_check check)
{
stream_t *s = demuxer->stream;
mkv_demuxer_t *mkv_d;
int64_t start_pos;
int64_t end_pos;
mkv_d = talloc_zero(demuxer, struct mkv_demuxer);
demuxer->priv = mkv_d;
mkv_d->tc_scale = 1000000;
mkv_d->a_skip_preroll = 1;
mkv_d->skip_to_timecode = INT64_MIN;
if (demuxer->params)
mkv_d->probably_webm_dash_init = demuxer->params->init_fragment.len > 0;
// Make sure you can seek back after read_ebml_header() if no EBML ID.
if (stream_read_peek(s, &(char[4]){0}, 4) != 4)
return -1;
if (!read_ebml_header(demuxer))
return -1;
MP_DBG(demuxer, "Found the head...\n");
if (!read_mkv_segment_header(demuxer, &end_pos))
return -1;
mkv_d->segment_start = stream_tell(s);
mkv_d->segment_end = end_pos;
mp_read_option_raw(demuxer->global, "index", &m_option_type_choice,
&mkv_d->index_mode);
mp_read_option_raw(demuxer->global, "edition", &m_option_type_choice,
&mkv_d->edition_id);
mkv_d->opts = mp_get_config_group(mkv_d, demuxer->global, &demux_mkv_conf);
if (demuxer->params && demuxer->params->matroska_was_valid)
*demuxer->params->matroska_was_valid = true;
while (1) {
start_pos = stream_tell(s);
uint32_t id = ebml_read_id(s);
if (s->eof) {
if (!mkv_d->probably_webm_dash_init)
MP_WARN(demuxer, "Unexpected end of file (no clusters found)\n");
break;
}
if (id == MATROSKA_ID_CLUSTER) {
MP_DBG(demuxer, "|+ found cluster\n");
mkv_d->cluster_start = start_pos;
break;
}
int res = read_header_element(demuxer, id, start_pos);
if (res < 0)
return -1;
}
int64_t end = stream_get_size(s);
// Read headers that come after the first cluster (i.e. require seeking).
// Note: reading might increase ->num_headers.
// Likewise, ->headers might be reallocated.
int only_cue = -1;
for (int n = 0; n < mkv_d->num_headers; n++) {
struct header_elem *elem = &mkv_d->headers[n];
if (elem->parsed)
continue;
// Warn against incomplete files and skip headers outside of range.
if (elem->pos >= end || !s->seekable) {
elem->parsed = true; // don't bother if file is incomplete
if (end < 0 || !s->seekable) {
MP_WARN(demuxer, "Stream is not seekable or unknown size, "
"not reading mkv metadata at end of file.\n");
} else if (!mkv_d->eof_warning &&
!(mkv_d->probably_webm_dash_init && elem->pos == end))
{
MP_WARN(demuxer, "mkv metadata beyond end of file - incomplete "
"file?\n");
mkv_d->eof_warning = true;
}
continue;
}
only_cue = only_cue < 0 && elem->id == MATROSKA_ID_CUES;
}
// If there's only 1 needed element, and it's the cues, defer reading.
if (only_cue == 1) {
// Read cues when they are needed, to avoid seeking on opening.
MP_VERBOSE(demuxer, "Deferring reading cues.\n");
} else {
// Read them by ascending position to reduce unneeded seeks.
// O(n^2) because the number of elements is very low.
while (1) {
struct header_elem *lowest = NULL;
for (int n = 0; n < mkv_d->num_headers; n++) {
struct header_elem *elem = &mkv_d->headers[n];
if (elem->parsed)
continue;
if (!lowest || elem->pos < lowest->pos)
lowest = elem;
}
if (!lowest)
break;
if (read_deferred_element(demuxer, lowest) < 0)
return -1;
}
}
if (!stream_seek(s, start_pos)) {
MP_ERR(demuxer, "Couldn't seek back after reading headers?\n");
return -1;
}
MP_VERBOSE(demuxer, "All headers are parsed!\n");
display_create_tracks(demuxer);
add_coverart(demuxer);
process_tags(demuxer);
probe_first_timestamp(demuxer);
if (mkv_d->opts->probe_duration)
probe_last_timestamp(demuxer, start_pos);
probe_x264_garbage(demuxer);
return 0;
}
// Read the laced block data at the current stream position (until endpos as
// indicated by the block length field) into individual buffers.
static int demux_mkv_read_block_lacing(struct block_info *block, int type,
struct stream *s, uint64_t endpos)
{
int laces;
uint32_t lace_size[MAX_NUM_LACES];
if (type == 0) { /* no lacing */
laces = 1;
lace_size[0] = endpos - stream_tell(s);
} else {
laces = stream_read_char(s);
if (laces < 0 || stream_tell(s) > endpos)
goto error;
laces += 1;
switch (type) {
case 1: { /* xiph lacing */
uint32_t total = 0;
for (int i = 0; i < laces - 1; i++) {
lace_size[i] = 0;
uint8_t t;
do {
t = stream_read_char(s);
if (s->eof || stream_tell(s) >= endpos)
goto error;
lace_size[i] += t;
} while (t == 0xFF);
total += lace_size[i];
}
uint32_t rest_length = endpos - stream_tell(s);
lace_size[laces - 1] = rest_length - total;
break;
}
case 2: { /* fixed-size lacing */
uint32_t full_length = endpos - stream_tell(s);
for (int i = 0; i < laces; i++)
lace_size[i] = full_length / laces;
break;
}
case 3: { /* EBML lacing */
uint64_t num = ebml_read_length(s);
if (num == EBML_UINT_INVALID || stream_tell(s) >= endpos)
goto error;
uint32_t total = lace_size[0] = num;
for (int i = 1; i < laces - 1; i++) {
int64_t snum = ebml_read_signed_length(s);
if (snum == EBML_INT_INVALID || stream_tell(s) >= endpos)
goto error;
lace_size[i] = lace_size[i - 1] + snum;
total += lace_size[i];
}
uint32_t rest_length = endpos - stream_tell(s);
lace_size[laces - 1] = rest_length - total;
break;
}
default:
goto error;
}
}
for (int i = 0; i < laces; i++) {
uint32_t size = lace_size[i];
if (stream_tell(s) + size > endpos || size > (1 << 30))
goto error;
int pad = MPMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_INPUT_PADDING);
AVBufferRef *buf = av_buffer_alloc(size + pad);
if (!buf)
goto error;
buf->size = size;
if (stream_read(s, buf->data, buf->size) != buf->size) {
av_buffer_unref(&buf);
goto error;
}
memset(buf->data + buf->size, 0, pad);
block->laces[block->num_laces++] = buf;
}
if (stream_tell(s) != endpos)
goto error;
return 0;
error:
return 1;
}
// Return whether the packet was handled & freed.
static bool handle_realaudio(demuxer_t *demuxer, mkv_track_t *track,
struct demux_packet *orig)
{
uint32_t sps = track->sub_packet_size;
uint32_t sph = track->sub_packet_h;
uint32_t cfs = track->coded_framesize; // restricted to [1,0x40000000]
uint32_t w = track->audiopk_size;
uint32_t spc = track->sub_packet_cnt;
uint8_t *buffer = orig->buffer;
uint32_t size = orig->len;
demux_packet_t *dp;
// track->audio_buf allocation size
size_t audiobuf_size = sph * w;
if (!track->audio_buf || !track->audio_timestamp || !track->stream)
return false;
const char *codec = track->stream->codec->codec ? track->stream->codec->codec : "";
if (!strcmp(codec, "ra_288")) {
for (int x = 0; x < sph / 2; x++) {
uint64_t dst_offset = x * 2 * w + spc * (uint64_t)cfs;
if (dst_offset + cfs > audiobuf_size)
goto error;
uint64_t src_offset = x * (uint64_t)cfs;
if (src_offset + cfs > size)
goto error;
memcpy(track->audio_buf + dst_offset, buffer + src_offset, cfs);
}
} else if (!strcmp(codec, "cook") || !strcmp(codec, "atrac3")) {
for (int x = 0; x < w / sps; x++) {
uint32_t dst_offset =
sps * (sph * x + ((sph + 1) / 2) * (spc & 1) + (spc >> 1));
if (dst_offset + sps > audiobuf_size)
goto error;
uint32_t src_offset = sps * x;
if (src_offset + sps > size)
goto error;
memcpy(track->audio_buf + dst_offset, buffer + src_offset, sps);
}
} else if (!strcmp(codec, "sipr")) {
if (spc * w + w > audiobuf_size || w > size)
goto error;
memcpy(track->audio_buf + spc * w, buffer, w);
if (spc == sph - 1) {
int n;
int bs = sph * w * 2 / 96; // nibbles per subpacket
// Perform reordering
for (n = 0; n < 38; n++) {
unsigned int i = bs * sipr_swaps[n][0]; // 77 max
unsigned int o = bs * sipr_swaps[n][1]; // 95 max
// swap nibbles of block 'i' with 'o'
for (int j = 0; j < bs; j++) {
if (i / 2 >= audiobuf_size || o / 2 >= audiobuf_size)
goto error;
uint8_t iv = track->audio_buf[i / 2];
uint8_t ov = track->audio_buf[o / 2];
int x = (i & 1) ? iv >> 4 : iv & 0x0F;
int y = (o & 1) ? ov >> 4 : ov & 0x0F;
track->audio_buf[o / 2] = (ov & 0x0F) | (o & 1 ? x << 4 : x);
track->audio_buf[i / 2] = (iv & 0x0F) | (i & 1 ? y << 4 : y);
i++;
o++;
}
}
}
} else {
// Not a codec that requires reordering
return false;
}
track->audio_timestamp[track->sub_packet_cnt] =
track->ra_pts == orig->pts ? 0 : orig->pts;
track->ra_pts = orig->pts;
if (++(track->sub_packet_cnt) == sph) {
track->sub_packet_cnt = 0;
// apk_usize has same range as coded_framesize in worst case
uint32_t apk_usize = track->stream->codec->block_align;
if (apk_usize > audiobuf_size)
goto error;
// Release all the audio packets
for (int x = 0; x < sph * w / apk_usize; x++) {
dp = new_demux_packet_from(track->audio_buf + x * apk_usize,
apk_usize);
if (!dp)
goto error;
/* Put timestamp only on packets that correspond to original
* audio packets in file */
dp->pts = (x * apk_usize % w) ? MP_NOPTS_VALUE :
track->audio_timestamp[x * apk_usize / w];
dp->pos = orig->pos + x;
dp->keyframe = !x; // Mark first packet as keyframe
add_packet(demuxer, track->stream, dp);
}
}
error:
talloc_free(orig);
return true;
}
static void mkv_seek_reset(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
for (int i = 0; i < mkv_d->num_tracks; i++) {
mkv_track_t *track = mkv_d->tracks[i];
if (track->av_parser)
av_parser_close(track->av_parser);
track->av_parser = NULL;
avcodec_free_context(&track->av_parser_codec);
}
for (int n = 0; n < mkv_d->num_blocks; n++)
free_block(&mkv_d->blocks[n]);
mkv_d->num_blocks = 0;
for (int n = 0; n < mkv_d->num_packets; n++)
talloc_free(mkv_d->packets[n]);
mkv_d->num_packets = 0;
mkv_d->skip_to_timecode = INT64_MIN;
}
// Copied from libavformat/matroskadec.c (FFmpeg 310f9dd / 2013-05-30)
// Originally added with Libav commit 9b6f47c
// License: LGPL v2.1 or later
// Author header: The FFmpeg Project (this function still came from Libav)
// Modified to use talloc, removed ffmpeg/libav specific error codes.
static int libav_parse_wavpack(mkv_track_t *track, uint8_t *src,
uint8_t **pdst, int *size)
{
uint8_t *dst = NULL;
int dstlen = 0;
int srclen = *size;
uint32_t samples;
uint16_t ver;
int offset = 0;
if (srclen < 12 || track->private_size < 2)
return -1;
ver = AV_RL16(track->private_data);
samples = AV_RL32(src);
src += 4;
srclen -= 4;
while (srclen >= 8) {
int multiblock;
uint32_t blocksize;
uint8_t *tmp;
uint32_t flags = AV_RL32(src);
uint32_t crc = AV_RL32(src + 4);
src += 8;
srclen -= 8;
multiblock = (flags & 0x1800) != 0x1800;
if (multiblock) {
if (srclen < 4)
goto fail;
blocksize = AV_RL32(src);
src += 4;
srclen -= 4;
} else {
blocksize = srclen;
}
if (blocksize > srclen)
goto fail;
if (dstlen > 0x10000000 || blocksize > 0x10000000)
goto fail;
tmp = talloc_realloc(track->parser_tmp, dst, uint8_t,
dstlen + blocksize + 32);
if (!tmp)
goto fail;
dst = tmp;
dstlen += blocksize + 32;
AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
AV_WL16(dst + offset + 8, ver); // version
AV_WL16(dst + offset + 10, 0); // track/index_no
AV_WL32(dst + offset + 12, 0); // total samples
AV_WL32(dst + offset + 16, 0); // block index
AV_WL32(dst + offset + 20, samples); // number of samples
AV_WL32(dst + offset + 24, flags); // flags
AV_WL32(dst + offset + 28, crc); // crc
memcpy (dst + offset + 32, src, blocksize); // block data
src += blocksize;
srclen -= blocksize;
offset += blocksize + 32;
}
*pdst = dst;
*size = dstlen;
return 0;
fail:
talloc_free(dst);
return -1;
}
static void mkv_parse_and_add_packet(demuxer_t *demuxer, mkv_track_t *track,
struct demux_packet *dp)
{
struct sh_stream *stream = track->stream;
if (stream->type == STREAM_AUDIO && handle_realaudio(demuxer, track, dp))
return;
if (strcmp(stream->codec->codec, "wavpack") == 0) {
int size = dp->len;
uint8_t *parsed;
if (libav_parse_wavpack(track, dp->buffer, &parsed, &size) >= 0) {
struct demux_packet *new = new_demux_packet_from(parsed, size);
if (new) {
demux_packet_copy_attribs(new, dp);
talloc_free(dp);
add_packet(demuxer, stream, new);
return;
}
}
}
if (strcmp(stream->codec->codec, "prores") == 0) {
size_t newlen = dp->len + 8;
struct demux_packet *new = new_demux_packet(newlen);
if (new) {
AV_WB32(new->buffer + 0, newlen);
AV_WB32(new->buffer + 4, MKBETAG('i', 'c', 'p', 'f'));
memcpy(new->buffer + 8, dp->buffer, dp->len);
demux_packet_copy_attribs(new, dp);
talloc_free(dp);
add_packet(demuxer, stream, new);
return;
}
}
if (track->parse && !track->av_parser) {
int id = mp_codec_to_av_codec_id(track->stream->codec->codec);
const AVCodec *codec = avcodec_find_decoder(id);
track->av_parser = av_parser_init(id);
if (codec)
track->av_parser_codec = avcodec_alloc_context3(codec);
}
if (!track->parse || !track->av_parser || !track->av_parser_codec) {
add_packet(demuxer, stream, dp);
return;
}
double tb = track->parse_timebase;
int64_t pts = dp->pts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : dp->pts * tb;
int64_t dts = dp->dts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : dp->dts * tb;
bool copy_sidedata = true;
while (dp->len) {
uint8_t *data = NULL;
int size = 0;
int len = av_parser_parse2(track->av_parser, track->av_parser_codec,
&data, &size, dp->buffer, dp->len,
pts, dts, 0);
if (len < 0 || len > dp->len)
break;
dp->buffer += len;
dp->len -= len;
dp->pos += len;
if (size) {
struct demux_packet *new = new_demux_packet_from(data, size);
if (!new)
break;
if (copy_sidedata)
av_packet_copy_props(new->avpacket, dp->avpacket);
copy_sidedata = false;
demux_packet_copy_attribs(new, dp);
if (track->parse_timebase) {
new->pts = track->av_parser->pts == AV_NOPTS_VALUE
? MP_NOPTS_VALUE : track->av_parser->pts / tb;
new->dts = track->av_parser->dts == AV_NOPTS_VALUE
? MP_NOPTS_VALUE : track->av_parser->dts / tb;
}
add_packet(demuxer, stream, new);
}
pts = dts = AV_NOPTS_VALUE;
}
if (dp->len) {
add_packet(demuxer, stream, dp);
} else {
talloc_free(dp);
}
}
static void free_block(struct block_info *block)
{
for (int n = 0; n < block->num_laces; n++)
av_buffer_unref(&block->laces[n]);
block->num_laces = 0;
TA_FREEP(&block->additions);
}
static void index_block(demuxer_t *demuxer, struct block_info *block)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
if (block->keyframe) {
add_block_position(demuxer, block->track, mkv_d->cluster_start,
block->timecode / mkv_d->tc_scale,
block->duration / mkv_d->tc_scale);
}
}
static int read_block(demuxer_t *demuxer, int64_t end, struct block_info *block)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
uint64_t num;
int16_t time;
uint64_t length;
free_block(block);
length = ebml_read_length(s);
if (!length || length > 500000000 || stream_tell(s) + length > (uint64_t)end)
return -1;
uint64_t endpos = stream_tell(s) + length;
int res = -1;
// Parse header of the Block element
/* first byte(s): track num */
num = ebml_read_length(s);
if (num == EBML_UINT_INVALID || stream_tell(s) >= endpos)
goto exit;
/* time (relative to cluster time) */
if (stream_tell(s) + 3 > endpos)
goto exit;
uint8_t c1 = stream_read_char(s);
uint8_t c2 = stream_read_char(s);
time = c1 << 8 | c2;
uint8_t header_flags = stream_read_char(s);
block->filepos = stream_tell(s);
int lace_type = (header_flags >> 1) & 0x03;
if (demux_mkv_read_block_lacing(block, lace_type, s, endpos))
goto exit;
if (block->simple)
block->keyframe = header_flags & 0x80;
block->timecode = time * mkv_d->tc_scale + mkv_d->cluster_tc;
for (int i = 0; i < mkv_d->num_tracks; i++) {
if (mkv_d->tracks[i]->tnum == num) {
block->track = mkv_d->tracks[i];
break;
}
}
if (!block->track) {
res = 0;
goto exit;
}
if (stream_tell(s) != endpos)
goto exit;
res = 1;
exit:
if (res <= 0)
free_block(block);
stream_seek_skip(s, endpos);
return res;
}
static int handle_block(demuxer_t *demuxer, struct block_info *block_info)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
double current_pts;
bool keyframe = block_info->keyframe;
uint64_t block_duration = block_info->duration;
int64_t tc = block_info->timecode;
mkv_track_t *track = block_info->track;
struct sh_stream *stream = track->stream;
bool use_this_block = tc >= mkv_d->skip_to_timecode;
if (!demux_stream_is_selected(stream))
return 0;
current_pts = tc / 1e9 - track->codec_delay;
if (track->require_keyframes && !keyframe) {
keyframe = true;
if (!mkv_d->keyframe_warning) {
MP_WARN(demuxer, "This is a broken file! Packets with incorrect "
"keyframe flag found. Enabling workaround.\n");
mkv_d->keyframe_warning = true;
}
}
if (track->type == MATROSKA_TRACK_AUDIO) {
if (mkv_d->a_skip_to_keyframe)
use_this_block &= keyframe;
} else if (track->type == MATROSKA_TRACK_SUBTITLE) {
if (!use_this_block && mkv_d->subtitle_preroll) {
int64_t end_time = block_info->timecode + block_info->duration;
if (!block_info->duration)
end_time = INT64_MAX;
use_this_block = end_time > mkv_d->skip_to_timecode;
if (use_this_block) {
if (mkv_d->subtitle_preroll) {
mkv_d->subtitle_preroll--;
} else {
// This could overflow the demuxer queue.
use_this_block = 0;
}
}
}
if (use_this_block) {
if (block_info->num_laces > 1) {
MP_WARN(demuxer, "Subtitles use Matroska "
"lacing. This is abnormal and not supported.\n");
use_this_block = 0;
}
}
} else if (track->type == MATROSKA_TRACK_VIDEO) {
if (mkv_d->v_skip_to_keyframe)
use_this_block &= keyframe;
}
if (use_this_block) {
uint64_t filepos = block_info->filepos;
for (int i = 0; i < block_info->num_laces; i++) {
AVBufferRef *data = block_info->laces[i];
demux_packet_t *dp = NULL;
bstr block = {data->data, data->size};
bstr nblock = demux_mkv_decode(demuxer->log, track, block, 1);
if (block.start != nblock.start || block.len != nblock.len) {
// (avoidable copy of the entire data)
dp = new_demux_packet_from(nblock.start, nblock.len);
} else {
dp = new_demux_packet_from_buf(data);
}
if (!dp)
break;
dp->pos = filepos;
/* If default_duration is 0, assume no pts value is known
* for packets after the first one (rather than all pts
* values being the same). Also, don't use it for extra
* packets resulting from parsing. */
if (i == 0 || track->default_duration) {
dp->pts = current_pts + i * track->default_duration;
dp->keyframe = keyframe;
}
if (stream->codec->avi_dts)
MPSWAP(double, dp->pts, dp->dts);
if (i == 0 && block_info->duration_known)
dp->duration = block_duration / 1e9;
if (stream->type == STREAM_AUDIO) {
unsigned int srate = stream->codec->samplerate;
demux_packet_set_padding(dp, 0,
block_info->discardpadding / 1e9 * srate);
mkv_d->a_skip_preroll = 0;
}
if (block_info->additions) {
for (int n = 0; n < block_info->additions->n_block_more; n++) {
struct ebml_block_more *add =
&block_info->additions->block_more[n];
int64_t id = add->n_block_add_id ? add->block_add_id : 1;
demux_packet_add_blockadditional(dp, id,
add->block_additional.start, add->block_additional.len);
}
}
mkv_parse_and_add_packet(demuxer, track, dp);
talloc_free_children(track->parser_tmp);
filepos += data->size;
}
if (stream->type == STREAM_VIDEO) {
mkv_d->v_skip_to_keyframe = 0;
mkv_d->skip_to_timecode = INT64_MIN;
mkv_d->subtitle_preroll = 0;
} else if (stream->type == STREAM_AUDIO) {
mkv_d->a_skip_to_keyframe = 0;
}
return 1;
}
return 0;
}
static int read_block_group(demuxer_t *demuxer, int64_t end,
struct block_info *block)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
*block = (struct block_info){ .keyframe = true };
while (stream_tell(s) < end) {
switch (ebml_read_id(s)) {
case MATROSKA_ID_BLOCKDURATION:
block->duration = ebml_read_uint(s);
if (block->duration == EBML_UINT_INVALID)
goto error;
block->duration *= mkv_d->tc_scale;
block->duration_known = true;
break;
case MATROSKA_ID_DISCARDPADDING:
block->discardpadding = ebml_read_uint(s);
if (block->discardpadding == EBML_UINT_INVALID)
goto error;
break;
case MATROSKA_ID_BLOCK:
if (read_block(demuxer, end, block) < 0)
goto error;
break;
case MATROSKA_ID_REFERENCEBLOCK:;
int64_t num = ebml_read_int(s);
if (num == EBML_INT_INVALID)
goto error;
block->keyframe = false;
break;
case MATROSKA_ID_BLOCKADDITIONS:;
struct ebml_block_additions additions = {0};
struct ebml_parse_ctx parse_ctx = {demuxer->log};
if (ebml_read_element(s, &parse_ctx, &additions,
&ebml_block_additions_desc) < 0)
return -1;
if (additions.n_block_more > 0) {
block->additions = talloc_dup(NULL, &additions);
talloc_steal(block->additions, parse_ctx.talloc_ctx);
parse_ctx.talloc_ctx = NULL;
}
talloc_free(parse_ctx.talloc_ctx);
break;
case MATROSKA_ID_CLUSTER:
case EBML_ID_INVALID:
goto error;
default:
if (ebml_read_skip(demuxer->log, end, s) != 0)
goto error;
break;
}
}
return block->num_laces ? 1 : 0;
error:
free_block(block);
return -1;
}
static int read_next_block_into_queue(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
struct block_info block = {0};
while (1) {
while (stream_tell(s) < mkv_d->cluster_end) {
int64_t start_filepos = stream_tell(s);
switch (ebml_read_id(s)) {
case MATROSKA_ID_TIMECODE: {
uint64_t num = ebml_read_uint(s);
if (num == EBML_UINT_INVALID)
goto find_next_cluster;
mkv_d->cluster_tc = num * mkv_d->tc_scale;
break;
}
case MATROSKA_ID_BLOCKGROUP: {
int64_t end = ebml_read_length(s);
end += stream_tell(s);
if (end > mkv_d->cluster_end)
goto find_next_cluster;
int res = read_block_group(demuxer, end, &block);
if (res < 0)
goto find_next_cluster;
if (res > 0)
goto add_block;
break;
}
case MATROSKA_ID_SIMPLEBLOCK: {
block = (struct block_info){ .simple = true };
int res = read_block(demuxer, mkv_d->cluster_end, &block);
if (res < 0)
goto find_next_cluster;
if (res > 0)
goto add_block;
break;
}
case MATROSKA_ID_CLUSTER:
mkv_d->cluster_start = start_filepos;
goto next_cluster;
case EBML_ID_INVALID:
goto find_next_cluster;
default: ;
if (ebml_read_skip(demuxer->log, mkv_d->cluster_end, s) != 0)
goto find_next_cluster;
break;
}
}
find_next_cluster:
mkv_d->cluster_end = 0;
for (;;) {
mkv_d->cluster_start = stream_tell(s);
uint32_t id = ebml_read_id(s);
if (id == MATROSKA_ID_CLUSTER)
break;
if (s->eof)
return -1;
if (demux_cancel_test(demuxer))
return -1;
if (id == EBML_ID_EBML && stream_tell(s) >= mkv_d->segment_end) {
// Appended segment - don't use its clusters, consider this EOF.
stream_seek(s, stream_tell(s) - 4);
return -1;
}
// For the sake of robustness, consider even unknown level 1
// elements the same as unknown/broken IDs.
if ((!ebml_is_mkv_level1_id(id) && id != EBML_ID_VOID) ||
ebml_read_skip(demuxer->log, -1, s) != 0)
{
stream_seek(s, mkv_d->cluster_start);
ebml_resync_cluster(demuxer->log, s);
}
}
next_cluster:
mkv_d->cluster_end = ebml_read_length(s);
// mkv files for "streaming" can have this legally
if (mkv_d->cluster_end != EBML_UINT_INVALID)
mkv_d->cluster_end += stream_tell(s);
}
MP_ASSERT_UNREACHABLE();
add_block:
index_block(demuxer, &block);
MP_TARRAY_APPEND(mkv_d, mkv_d->blocks, mkv_d->num_blocks, block);
return 1;
}
static int read_next_block(demuxer_t *demuxer, struct block_info *block)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
if (!mkv_d->num_blocks) {
int res = read_next_block_into_queue(demuxer);
if (res < 1)
return res;
assert(mkv_d->num_blocks);
}
*block = mkv_d->blocks[0];
MP_TARRAY_REMOVE_AT(mkv_d->blocks, mkv_d->num_blocks, 0);
return 1;
}
static bool demux_mkv_read_packet(struct demuxer *demuxer,
struct demux_packet **pkt)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
for (;;) {
if (mkv_d->num_packets) {
*pkt = mkv_d->packets[0];
MP_TARRAY_REMOVE_AT(mkv_d->packets, mkv_d->num_packets, 0);
return true;
}
int res;
struct block_info block;
res = read_next_block(demuxer, &block);
if (res < 0)
return false;
if (res > 0) {
handle_block(demuxer, &block);
free_block(&block);
}
}
}
static mkv_index_t *get_highest_index_entry(struct demuxer *demuxer)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
assert(!mkv_d->index_complete); // would require separate code
mkv_index_t *index = NULL;
for (int n = 0; n < mkv_d->num_tracks; n++) {
int n_index = mkv_d->tracks[n]->last_index_entry;
if (n_index >= 0) {
mkv_index_t *index2 = &mkv_d->indexes[n_index];
if (!index || index2->filepos > index->filepos)
index = index2;
}
}
return index;
}
static int create_index_until(struct demuxer *demuxer, int64_t timecode)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
struct stream *s = demuxer->stream;
read_deferred_cues(demuxer);
if (mkv_d->index_complete)
return 0;
mkv_index_t *index = get_highest_index_entry(demuxer);
if (!index || index->timecode * mkv_d->tc_scale < timecode) {
stream_seek(s, index ? index->filepos : mkv_d->cluster_start);
MP_VERBOSE(demuxer, "creating index until TC %"PRId64"\n", timecode);
for (;;) {
int res;
struct block_info block;
res = read_next_block(demuxer, &block);
if (res < 0)
break;
if (res > 0) {
free_block(&block);
}
index = get_highest_index_entry(demuxer);
if (index && index->timecode * mkv_d->tc_scale >= timecode)
break;
}
}
if (!mkv_d->indexes) {
MP_WARN(demuxer, "no target for seek found\n");
return -1;
}
return 0;
}
static struct mkv_index *seek_with_cues(struct demuxer *demuxer, int seek_id,
int64_t target_timecode, int flags)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
struct mkv_index *index = NULL;
int64_t min_diff = INT64_MIN;
for (size_t i = 0; i < mkv_d->num_indexes; i++) {
if (seek_id < 0 || mkv_d->indexes[i].tnum == seek_id) {
int64_t diff =
mkv_d->indexes[i].timecode * mkv_d->tc_scale - target_timecode;
if (flags & SEEK_FORWARD)
diff = -diff;
if (min_diff != INT64_MIN) {
if (diff <= 0) {
if (min_diff <= 0 && diff <= min_diff)
continue;
} else if (diff >= min_diff)
continue;
}
min_diff = diff;
index = mkv_d->indexes + i;
}
}
if (index) { /* We've found an entry. */
uint64_t seek_pos = index->filepos;
if (flags & SEEK_HR) {
// Find the cluster with the highest filepos, that has a timestamp
// still lower than min_tc.
double secs = mkv_d->opts->subtitle_preroll_secs;
if (mkv_d->index_has_durations)
secs = MPMAX(secs, mkv_d->opts->subtitle_preroll_secs_index);
double pre_f = secs * 1e9 / mkv_d->tc_scale;
int64_t pre = pre_f >= (double)INT64_MAX ? INT64_MAX : (int64_t)pre_f;
int64_t min_tc = pre < index->timecode ? index->timecode - pre : 0;
uint64_t prev_target = 0;
int64_t prev_tc = 0;
for (size_t i = 0; i < mkv_d->num_indexes; i++) {
if (seek_id < 0 || mkv_d->indexes[i].tnum == seek_id) {
struct mkv_index *cur = &mkv_d->indexes[i];
if (cur->timecode <= min_tc && cur->timecode >= prev_tc) {
prev_tc = cur->timecode;
prev_target = cur->filepos;
}
}
}
if (mkv_d->index_has_durations) {
// Find the earliest cluster that is not before prev_target,
// but contains subtitle packets overlapping with the cluster
// at seek_pos.
uint64_t target = seek_pos;
for (size_t i = 0; i < mkv_d->num_indexes; i++) {
struct mkv_index *cur = &mkv_d->indexes[i];
if (cur->timecode <= index->timecode &&
cur->timecode + cur->duration > index->timecode &&
cur->filepos >= prev_target &&
cur->filepos < target)
{
target = cur->filepos;
}
}
prev_target = target;
}
if (prev_target)
seek_pos = prev_target;
}
mkv_d->cluster_end = 0;
stream_seek(demuxer->stream, seek_pos);
}
return index;
}
static void demux_mkv_seek(demuxer_t *demuxer, double seek_pts, int flags)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
int64_t old_pos = stream_tell(demuxer->stream);
uint64_t v_tnum = -1;
uint64_t a_tnum = -1;
bool st_active[STREAM_TYPE_COUNT] = {0};
mkv_seek_reset(demuxer);
for (int i = 0; i < mkv_d->num_tracks; i++) {
mkv_track_t *track = mkv_d->tracks[i];
if (demux_stream_is_selected(track->stream)) {
st_active[track->stream->type] = true;
if (track->type == MATROSKA_TRACK_VIDEO)
v_tnum = track->tnum;
if (track->type == MATROSKA_TRACK_AUDIO)
a_tnum = track->tnum;
}
}
mkv_d->subtitle_preroll = NUM_SUB_PREROLL_PACKETS;
int preroll_opt = mkv_d->opts->subtitle_preroll;
if (preroll_opt == 1 || (preroll_opt == 2 && mkv_d->index_has_durations))
flags |= SEEK_HR;
if (!st_active[STREAM_SUB])
flags &= ~SEEK_HR;
// Adjust the target a little bit to catch cases where the target position
// specifies a keyframe with high, but not perfect, precision.
seek_pts += flags & SEEK_FORWARD ? -0.005 : 0.005;
if (!(flags & SEEK_FACTOR)) { /* time in secs */
mkv_index_t *index = NULL;
seek_pts = MPMAX(seek_pts, 0);
int64_t target_timecode = seek_pts * 1e9 + 0.5;
if (create_index_until(demuxer, target_timecode) >= 0) {
int seek_id = st_active[STREAM_VIDEO] ? v_tnum : a_tnum;
index = seek_with_cues(demuxer, seek_id, target_timecode, flags);
if (!index)
index = seek_with_cues(demuxer, -1, target_timecode, flags);
}
if (!index)
stream_seek(demuxer->stream, old_pos);
if (flags & SEEK_FORWARD) {
mkv_d->skip_to_timecode = target_timecode;
} else {
mkv_d->skip_to_timecode = index ? index->timecode * mkv_d->tc_scale
: INT64_MIN;
}
} else {
stream_t *s = demuxer->stream;
read_deferred_cues(demuxer);
int64_t size = stream_get_size(s);
int64_t target_filepos = size * MPCLAMP(seek_pts, 0, 1);
mkv_index_t *index = NULL;
if (mkv_d->index_complete) {
for (size_t i = 0; i < mkv_d->num_indexes; i++) {
if (mkv_d->indexes[i].tnum == v_tnum) {
if ((index == NULL)
|| ((mkv_d->indexes[i].filepos >= target_filepos)
&& ((index->filepos < target_filepos)
|| (mkv_d->indexes[i].filepos < index->filepos))))
index = &mkv_d->indexes[i];
}
}
}
mkv_d->cluster_end = 0;
if (index) {
stream_seek(s, index->filepos);
mkv_d->skip_to_timecode = index->timecode * mkv_d->tc_scale;
} else {
stream_seek(s, MPMAX(target_filepos, 0));
if (ebml_resync_cluster(mp_null_log, s) < 0) {
// Assume EOF
mkv_d->cluster_end = size;
}
}
}
mkv_d->v_skip_to_keyframe = st_active[STREAM_VIDEO];
mkv_d->a_skip_to_keyframe = st_active[STREAM_AUDIO];
mkv_d->a_skip_preroll = mkv_d->a_skip_to_keyframe;
}
static void probe_last_timestamp(struct demuxer *demuxer, int64_t start_pos)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
if (!demuxer->seekable)
return;
// Pick some arbitrary video track
int v_tnum = -1;
for (int n = 0; n < mkv_d->num_tracks; n++) {
if (mkv_d->tracks[n]->type == MATROSKA_TRACK_VIDEO) {
v_tnum = mkv_d->tracks[n]->tnum;
break;
}
}
if (v_tnum < 0)
return;
// In full mode, we start reading data from the current file position,
// which works because this function is called after headers are parsed.
if (mkv_d->opts->probe_duration != 2) {
read_deferred_cues(demuxer);
if (mkv_d->index_complete) {
// Find last cluster that still has video packets
int64_t target = 0;
for (size_t i = 0; i < mkv_d->num_indexes; i++) {
struct mkv_index *cur = &mkv_d->indexes[i];
if (cur->tnum == v_tnum)
target = MPMAX(target, cur->filepos);
}
if (!target)
return;
if (!stream_seek(demuxer->stream, target))
return;
} else {
// No index -> just try to find a random cluster towards file end.
int64_t size = stream_get_size(demuxer->stream);
stream_seek(demuxer->stream, MPMAX(size - 10 * 1024 * 1024, 0));
if (ebml_resync_cluster(mp_null_log, demuxer->stream) < 0)
stream_seek(demuxer->stream, start_pos); // full scan otherwise
}
}
mkv_seek_reset(demuxer);
int64_t last_ts[STREAM_TYPE_COUNT] = {0};
while (1) {
struct block_info block;
int res = read_next_block(demuxer, &block);
if (res < 0)
break;
if (res > 0) {
if (block.track && block.track->stream) {
enum stream_type type = block.track->stream->type;
uint64_t endtime = block.timecode + block.duration;
if (last_ts[type] < endtime)
last_ts[type] = endtime;
}
free_block(&block);
}
}
if (!last_ts[STREAM_VIDEO])
last_ts[STREAM_VIDEO] = mkv_d->cluster_tc;
if (last_ts[STREAM_VIDEO]) {
mkv_d->duration = last_ts[STREAM_VIDEO] / 1e9 - demuxer->start_time;
demuxer->duration = mkv_d->duration;
}
stream_seek(demuxer->stream, start_pos);
mkv_d->cluster_start = mkv_d->cluster_end = 0;
}
static void probe_first_timestamp(struct demuxer *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
if (!mkv_d->opts->probe_start_time)
return;
read_next_block_into_queue(demuxer);
demuxer->start_time = mkv_d->cluster_tc / 1e9;
if (demuxer->start_time)
MP_VERBOSE(demuxer, "Start PTS: %f\n", demuxer->start_time);
}
static void mkv_free(struct demuxer *demuxer)
{
struct mkv_demuxer *mkv_d = demuxer->priv;
if (!mkv_d)
return;
mkv_seek_reset(demuxer);
for (int i = 0; i < mkv_d->num_tracks; i++)
demux_mkv_free_trackentry(mkv_d->tracks[i]);
}
const demuxer_desc_t demuxer_desc_matroska = {
.name = "mkv",
.desc = "Matroska",
.open = demux_mkv_open,
.read_packet = demux_mkv_read_packet,
.close = mkv_free,
.seek = demux_mkv_seek,
.load_timeline = build_ordered_chapter_timeline,
};
bool demux_matroska_uid_cmp(struct matroska_segment_uid *a,
struct matroska_segment_uid *b)
{
return (!memcmp(a->segment, b->segment, 16) &&
a->edition == b->edition);
}
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