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mpv/demux/demux_mkv.c
wm4 3938349cd5 demux_mkv: fix scary sign extension issues 
Expressions involving uint16_t are promoted to int, which then can
overflow if the uint16_t values are large enough.

Found by Coverity.
2014-11-21 05:18:01 +01:00

2977 lines
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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 MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdbool.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 "talloc.h"
#include "common/av_common.h"
#include "options/options.h"
#include "misc/bstr.h"
#include "stream/stream.h"
#include "video/csputils.h"
#include "demux.h"
#include "stheader.h"
#include "ebml.h"
#include "matroska.h"
#include "codec_tags.h"
#include "video/img_fourcc.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;
char *name;
struct sh_stream *stream;
char *codec_id;
int ms_compat;
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;
uint32_t a_formattag;
uint32_t a_channels, a_bps;
float a_sfreq;
float a_osfreq;
double default_duration;
double codec_delay;
int default_track;
unsigned char *private_data;
unsigned int private_size;
bool parse;
void *parser_tmp;
AVCodecParserContext *av_parser;
AVCodecContext *av_parser_codec;
/* stuff for realmedia */
int realmedia;
int64_t rv_kf_base;
int rv_kf_pts;
double ra_pts; /* previous audio timestamp */
/** realaudio descrambling */
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
int audio_filepos; ///< file position of first audio packet in block
/* 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;
uint64_t timecode, duration;
uint64_t filepos; // position of the cluster which contains the packet
} mkv_index_t;
typedef struct mkv_demuxer {
int64_t segment_start, segment_end;
double duration, last_pts;
uint64_t last_filepos;
mkv_track_t **tracks;
int num_tracks;
struct ebml_tags *tags;
uint64_t tc_scale, cluster_tc;
uint64_t cluster_start;
uint64_t cluster_end;
mkv_index_t *indexes;
size_t num_indexes;
bool index_complete;
uint64_t deferred_cues;
struct header_elem {
int32_t id;
int64_t pos;
bool parsed;
} *headers;
int num_headers;
uint64_t skip_to_timecode;
int v_skip_to_keyframe, a_skip_to_keyframe;
int a_skip_preroll;
int subtitle_preroll;
bool index_has_durations;
} mkv_demuxer_t;
#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);
#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_dbg(log, "lzo decompression buffer too small.\n");
if (dstlen >= maxlen / 2) {
talloc_free(dest);
dest = NULL;
goto error;
}
dstlen *= 2;
}
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_VERBOSE(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.n_timecode_scale) {
mkv_d->tc_scale = info.timecode_scale;
MP_VERBOSE(demuxer, "| + timecode scale: %" PRIu64 "\n", mkv_d->tc_scale);
}
if (info.n_duration) {
mkv_d->duration = info.duration * mkv_d->tc_scale / 1e9;
MP_VERBOSE(demuxer, "| + duration: %.3fs\n",
mkv_d->duration);
}
if (info.n_title) {
mp_tags_set_bstr(demuxer->metadata, bstr0("TITLE"), info.title);
}
if (info.n_segment_uid) {
int len = info.segment_uid.len;
if (len != sizeof(demuxer->matroska_data.uid.segment)) {
MP_INFO(demuxer, "segment uid invalid length %d\n", len);
} else {
memcpy(demuxer->matroska_data.uid.segment, info.segment_uid.start,
len);
MP_VERBOSE(demuxer, "| + segment uid");
for (int i = 0; i < len; i++)
MP_VERBOSE(demuxer, " %02x",
demuxer->matroska_data.uid.segment[i]);
MP_VERBOSE(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_INFO(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 %u 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 %u 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 %u 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_VERBOSE(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_VERBOSE(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_VERBOSE(demuxer, "| + Bit depth: %u\n", track->a_bps);
}
if (audio->n_channels) {
track->a_channels = audio->channels;
MP_VERBOSE(demuxer, "| + Channels: %u\n", track->a_channels);
} else {
track->a_channels = 1;
}
}
static void parse_trackvideo(struct demuxer *demuxer, struct mkv_track *track,
struct ebml_video *video)
{
if (video->n_frame_rate) {
track->v_frate = video->frame_rate;
MP_VERBOSE(demuxer, "| + Frame rate: %f\n", track->v_frate);
if (track->v_frate > 0)
track->default_duration = 1 / track->v_frate;
}
if (video->n_display_width) {
track->v_dwidth = video->display_width;
track->v_dwidth_set = true;
MP_VERBOSE(demuxer, "| + Display width: %u\n", track->v_dwidth);
}
if (video->n_display_height) {
track->v_dheight = video->display_height;
track->v_dheight_set = true;
MP_VERBOSE(demuxer, "| + Display height: %u\n", track->v_dheight);
}
if (video->n_pixel_width) {
track->v_width = video->pixel_width;
MP_VERBOSE(demuxer, "| + Pixel width: %u\n", track->v_width);
}
if (video->n_pixel_height) {
track->v_height = video->pixel_height;
MP_VERBOSE(demuxer, "| + Pixel height: %u\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_VERBOSE(demuxer, "| + Colorspace: %#x\n",
(unsigned int)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_VERBOSE(demuxer, "| + StereoMode: %s\n", name);
} else {
MP_WARN(demuxer, "Unknown StereoMode: %d\n", (int)video->stereo_mode);
}
}
}
/**
* \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_VERBOSE(demuxer, "| + Track number: %u\n", track->tnum);
} else {
MP_ERR(demuxer, "Missing track number!\n");
}
if (entry->n_name) {
track->name = talloc_strndup(track, entry->name.start,
entry->name.len);
MP_VERBOSE(demuxer, "| + Name: %s\n", track->name);
}
track->type = entry->track_type;
MP_VERBOSE(demuxer, "| + Track type: ");
switch (track->type) {
case MATROSKA_TRACK_AUDIO:
MP_VERBOSE(demuxer, "Audio\n");
break;
case MATROSKA_TRACK_VIDEO:
MP_VERBOSE(demuxer, "Video\n");
break;
case MATROSKA_TRACK_SUBTITLE:
MP_VERBOSE(demuxer, "Subtitle\n");
break;
default:
MP_VERBOSE(demuxer, "unknown\n");
break;
}
if (entry->n_audio) {
MP_VERBOSE(demuxer, "| + Audio track\n");
parse_trackaudio(demuxer, track, &entry->audio);
}
if (entry->n_video) {
MP_VERBOSE(demuxer, "| + Video track\n");
parse_trackvideo(demuxer, track, &entry->video);
}
if (entry->n_codec_id) {
track->codec_id = talloc_strndup(track, entry->codec_id.start,
entry->codec_id.len);
if (!strcmp(track->codec_id, MKV_V_MSCOMP)
|| !strcmp(track->codec_id, MKV_A_ACM))
track->ms_compat = 1;
MP_VERBOSE(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_VERBOSE(demuxer, "| + CodecPrivate, length %u\n", track->private_size);
}
if (entry->n_language) {
track->language = talloc_strndup(track, entry->language.start,
entry->language.len);
MP_VERBOSE(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_VERBOSE(demuxer, "| + Default flag: %u\n", track->default_track);
} else {
track->default_track = 1;
}
if (entry->n_default_duration) {
track->default_duration = entry->default_duration / 1e9;
if (entry->default_duration == 0) {
MP_VERBOSE(demuxer, "| + Default duration: 0");
} else {
if (!track->v_frate)
track->v_frate = 1e9 / entry->default_duration;
MP_VERBOSE(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_VERBOSE(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_VERBOSE(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,
uint64_t timecode, uint64_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,
uint64_t timecode, uint64_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)
{
struct MPOpts *opts = demuxer->opts;
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
mkv_d->deferred_cues = 0;
if (opts->index_mode != 1) {
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;
mkv_d->num_indexes = 0;
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];
if (cuepoint->n_cue_time != 1 || !cuepoint->n_cue_track_positions) {
MP_WARN(demuxer, "Malformed CuePoint element\n");
continue;
}
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_DBG(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;
MP_VERBOSE(demuxer, "\\---- [ parsing cues ] -----------\n");
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
static void read_deferred_cues(demuxer_t *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
stream_t *s = demuxer->stream;
if (mkv_d->deferred_cues) {
int64_t pos = mkv_d->deferred_cues;
mkv_d->deferred_cues = 0;
if (!stream_seek(s, pos)) {
MP_WARN(demuxer, "Failed to seek to cues\n");
return;
}
if (ebml_read_id(s) != MATROSKA_ID_CUES) {
MP_WARN(demuxer, "Expected element not found\n");
return;
}
demux_mkv_read_cues(demuxer);
}
}
static int demux_mkv_read_chapters(struct demuxer *demuxer)
{
struct MPOpts *opts = demuxer->opts;
stream_t *s = demuxer->stream;
int wanted_edition = opts->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_VERBOSE(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);
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};
struct bstr name = { "(unnamed)", 9 };
if (!ca->n_chapter_time_start)
MP_MSG(demuxer, warn_level, "Chapter lacks start time\n");
chapter.start = ca->chapter_time_start;
chapter.end = ca->chapter_time_end;
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].n_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_VERBOSE(demuxer, "Chapter segment uid ");
for (int n = 0; n < len; n++)
MP_VERBOSE(demuxer, "%02x ",
chapter.uid.segment[n]);
MP_VERBOSE(demuxer, "\n");
}
}
MP_VERBOSE(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),
BSTR_P(name));
if (idx == selected_edition) {
demuxer_add_chapter(demuxer, name, chapter.start / 1e9,
ca->chapter_uid);
}
if (m_chapters) {
chapter.name = talloc_strndup(m_chapters, name.start, name.len);
m_chapters[i] = chapter;
}
}
}
demuxer->num_editions = num_editions;
demuxer->edition = selected_edition;
talloc_free(parse_ctx.talloc_ctx);
MP_VERBOSE(demuxer, "\\---- [ parsing chapters ] ---------\n");
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_memdup(mkv_d, &tags, sizeof(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];
if (tag.targets.target_track_uid || tag.targets.target_attachment_uid)
continue;
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 {
dst = demuxer->metadata;
}
if (dst) {
for (int j = 0; j < tag.n_simple_tag; j++) {
mp_tags_set_bstr(dst, tag.simple_tag[j].tag_name,
tag.simple_tag[j].tag_string);
}
}
}
}
static int demux_mkv_read_attachments(demuxer_t *demuxer)
{
stream_t *s = demuxer->stream;
MP_VERBOSE(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->n_file_name || !attachment->n_file_mime_type
|| !attachment->n_file_data) {
MP_WARN(demuxer, "Malformed attachment\n");
continue;
}
struct bstr name = attachment->file_name;
struct bstr mime = attachment->file_mime_type;
demuxer_add_attachment(demuxer, name, mime, attachment->file_data);
MP_VERBOSE(demuxer, "Attachment: %.*s, %.*s, %zu bytes\n",
BSTR_P(name), BSTR_P(mime), attachment->file_data.len);
}
talloc_free(parse_ctx.talloc_ctx);
MP_VERBOSE(demuxer, "\\---- [ parsing attachments ] ---------\n");
return 0;
}
static int read_header_element(struct demuxer *demuxer, uint32_t id,
int64_t at_filepos);
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_VERBOSE(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_VERBOSE(demuxer, "Element 0x%x at %"PRIu64".\n",
(unsigned)seek->seek_id, pos);
get_header_element(demuxer, seek->seek_id, pos);
// This is nice to warn against incomplete files.
int64_t end = 0;
stream_control(s, STREAM_CTRL_GET_SIZE, &end);
if (pos >= end)
MP_WARN(demuxer, "SeekHead position beyond "
"end of file - incomplete file?\n");
}
out:
MP_VERBOSE(demuxer, "\\---- [ parsing seek head ] ---------\n");
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 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;
}
}
}
typedef struct {
char *id;
int fourcc;
int extradata;
bool parse;
} videocodec_info_t;
static const videocodec_info_t vinfo[] = {
{MKV_V_MJPEG, MP_FOURCC('m', 'j', 'p', 'g'), 1},
{MKV_V_MPEG1, MP_FOURCC('m', 'p', 'g', '1'), 0},
{MKV_V_MPEG2, MP_FOURCC('m', 'p', 'g', '2'), 0},
{MKV_V_MPEG4_SP, MP_FOURCC('m', 'p', '4', 'v'), 1},
{MKV_V_MPEG4_ASP, MP_FOURCC('m', 'p', '4', 'v'), 1},
{MKV_V_MPEG4_AP, MP_FOURCC('m', 'p', '4', 'v'), 1},
{MKV_V_MPEG4_AVC, MP_FOURCC('a', 'v', 'c', '1'), 1},
{MKV_V_THEORA, MP_FOURCC('t', 'h', 'e', 'o'), 1},
{MKV_V_VP8, MP_FOURCC('V', 'P', '8', '0'), 0},
{MKV_V_VP9, MP_FOURCC('V', 'P', '9', '0'), 0, true},
{MKV_V_DIRAC, MP_FOURCC('d', 'r', 'a', 'c'), 0},
{MKV_V_PRORES, MP_FOURCC('p', 'r', '0', '0'), 0},
{MKV_V_HEVC, MP_FOURCC('H', 'E', 'V', 'C'), 1},
{0}
};
static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track)
{
unsigned char *extradata = NULL;
unsigned int extradata_size = 0;
bool raw = false;
struct sh_stream *sh = new_sh_stream(demuxer, STREAM_VIDEO);
if (!sh)
return 1;
track->stream = sh;
sh_video_t *sh_v = sh->video;
sh->demuxer_id = track->tnum;
sh->title = talloc_strdup(sh_v, track->name);
if (track->ms_compat) { /* MS compatibility mode */
// The private_data contains a BITMAPINFOHEADER struct
if (track->private_data == NULL || track->private_size < 40)
return 1;
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->format = AV_RL32(h + 16); // biCompression
extradata = track->private_data + 40;
extradata_size = track->private_size - 40;
} else {
sh_v->bits_per_coded_sample = 24;
if (track->private_size >= RVPROPERTIES_SIZE
&& (!strcmp(track->codec_id, MKV_V_REALV10)
|| !strcmp(track->codec_id, MKV_V_REALV20)
|| !strcmp(track->codec_id, MKV_V_REALV30)
|| !strcmp(track->codec_id, MKV_V_REALV40))) {
unsigned char *src;
uint32_t type2;
unsigned int cnt;
src = (uint8_t *) track->private_data + RVPROPERTIES_SIZE;
cnt = track->private_size - RVPROPERTIES_SIZE;
type2 = AV_RB32(src - 4);
if (type2 == 0x10003000 || type2 == 0x10003001)
sh->format = MP_FOURCC('R', 'V', '1', '3');
else
sh->format = MP_FOURCC('R', 'V', track->codec_id[9], '0');
// copy type1 and type2 info from rv properties
extradata_size = cnt + 8;
extradata = src - 8;
track->realmedia = 1;
} else if (strcmp(track->codec_id, MKV_V_UNCOMPRESSED) == 0) {
// raw video, "like AVI" - this is a FourCC
sh->format = track->colorspace;
raw = true;
} else {
const videocodec_info_t *vi = vinfo;
while (vi->id && strcmp(vi->id, track->codec_id))
vi++;
sh->format = vi->fourcc;
if (vi->extradata && track->private_data
&& (track->private_size > 0)) {
extradata = track->private_data;
extradata_size = track->private_size;
}
track->parse = vi->parse;
if (!vi->id) {
MP_WARN(demuxer, "Unknown/unsupported "
"CodecID (%s) or missing/bad CodecPrivate\n"
"data (track %u).\n",
track->codec_id, track->tnum);
return 1;
}
}
}
if (extradata_size > 0x1000000) {
MP_WARN(demuxer, "Invalid CodecPrivate\n");
return 1;
}
sh_v->coded_width = track->v_width;
sh_v->coded_height = track->v_height;
sh_v->extradata = talloc_memdup(sh_v, extradata, extradata_size);
sh_v->extradata_len = extradata_size;
if (raw) {
sh->codec = "rawvideo";
} else {
mp_set_codec_from_tag(sh);
sh->format = mp_video_fourcc_alias(sh->format);
}
if (track->v_frate == 0.0)
track->v_frate = 25.0;
sh_v->fps = track->v_frate;
sh_v->aspect = 0;
if (!track->realmedia) {
sh_v->disp_w = track->v_width;
sh_v->disp_h = track->v_height;
uint32_t dw = track->v_dwidth_set ? track->v_dwidth : track->v_width;
uint32_t dh = track->v_dheight_set ? track->v_dheight : track->v_height;
if (dw && dh)
sh_v->aspect = (double) dw / dh;
} else {
// vd_realvid.c will set aspect to disp_w/disp_h and rederive
// disp_w and disp_h from the RealVideo stream contents returned
// by the Real DLLs. If DisplayWidth/DisplayHeight was not set in
// the Matroska file then it has already been set to PixelWidth/Height
// by check_track_information.
sh_v->disp_w = track->v_dwidth;
sh_v->disp_h = track->v_dheight;
}
MP_VERBOSE(demuxer, "Aspect: %f\n", sh_v->aspect);
sh_v->avi_dts = track->ms_compat;
sh_v->stereo_mode = track->stereo_mode;
return 0;
}
static const struct mkv_audio_tag {
char *id; bool prefix; uint32_t formattag;
bool parse;
} mkv_audio_tags[] = {
{ MKV_A_MP2, 0, 0x0055 },
{ MKV_A_MP3, 0, 0x0055, true },
{ MKV_A_AC3, 1, 0x2000 },
{ MKV_A_EAC3, 1, MP_FOURCC('E', 'A', 'C', '3') },
{ MKV_A_DTS, 0, 0x2001 },
{ MKV_A_PCM, 0, 0x0001 },
{ MKV_A_PCM_BE, 0, 0x0001 },
{ MKV_A_PCM_FLT, 0, 0x0003 },
{ MKV_A_AAC_2MAIN, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_2LC, 1, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_2SSR, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_4MAIN, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_4LC, 1, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_4SSR, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC_4LTP, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_AAC, 0, MP_FOURCC('M', 'P', '4', 'A') },
{ MKV_A_VORBIS, 0, MP_FOURCC('v', 'r', 'b', 's') },
{ MKV_A_OPUS, 0, MP_FOURCC('O', 'p', 'u', 's') },
{ MKV_A_OPUS_EXP, 0, MP_FOURCC('O', 'p', 'u', 's') },
{ MKV_A_QDMC, 0, MP_FOURCC('Q', 'D', 'M', 'C') },
{ MKV_A_QDMC2, 0, MP_FOURCC('Q', 'D', 'M', '2') },
{ MKV_A_WAVPACK, 0, MP_FOURCC('W', 'V', 'P', 'K') },
{ MKV_A_TRUEHD, 0, MP_FOURCC('T', 'R', 'H', 'D'), true },
{ MKV_A_FLAC, 0, MP_FOURCC('f', 'L', 'a', 'C') },
{ MKV_A_ALAC, 0, MP_FOURCC('a', 'L', 'a', 'C') },
{ MKV_A_REAL28, 0, MP_FOURCC('2', '8', '_', '8') },
{ MKV_A_REALATRC, 0, MP_FOURCC('a', 't', 'r', 'c') },
{ MKV_A_REALCOOK, 0, MP_FOURCC('c', 'o', 'o', 'k') },
{ MKV_A_REALDNET, 0, MP_FOURCC('d', 'n', 'e', 't') },
{ MKV_A_REALSIPR, 0, MP_FOURCC('s', 'i', 'p', 'r') },
{ MKV_A_TTA1, 0, MP_FOURCC('T', 'T', 'A', '1') },
{ NULL },
};
static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track)
{
struct sh_stream *sh = new_sh_stream(demuxer, STREAM_AUDIO);
if (!sh)
return 1;
track->stream = sh;
sh_audio_t *sh_a = sh->audio;
unsigned char *extradata = NULL;
int extradata_len = 0;
if (track->language && (strcmp(track->language, "und") != 0))
sh->lang = talloc_strdup(sh_a, track->language);
sh->demuxer_id = track->tnum;
sh->title = talloc_strdup(sh_a, track->name);
sh->default_track = track->default_track;
if (!track->a_osfreq)
track->a_osfreq = track->a_sfreq;
if (track->ms_compat) {
// The private_data contains a WAVEFORMATEX struct
if (track->private_size < 18)
goto error;
MP_VERBOSE(demuxer, "track with MS compat audio.\n");
unsigned char *h = track->private_data;
track->a_formattag = AV_RL16(h + 0); // wFormatTag
if (track->a_channels == 0)
track->a_channels = AV_RL16(h + 2); // nChannels
if (track->a_osfreq == 0.0)
track->a_osfreq = 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;
} else {
for (int i = 0; ; i++) {
const struct mkv_audio_tag *t = mkv_audio_tags + i;
if (t->id == NULL)
goto error;
if (t->prefix) {
if (!bstr_startswith0(bstr0(track->codec_id), t->id))
continue;
} else {
if (strcmp(track->codec_id, t->id))
continue;
}
track->a_formattag = t->formattag;
track->parse = t->parse;
break;
}
}
sh->format = track->a_formattag;
mp_chmap_set_unknown(&sh_a->channels, track->a_channels);
sh_a->samplerate = (uint32_t) track->a_osfreq;
if (track->a_bps == 0)
sh_a->bits_per_coded_sample = 16;
else
sh_a->bits_per_coded_sample = track->a_bps;
if (track->a_formattag == 0x0055) { /* MP3 || MP2 */
sh_a->bitrate = 16000 * 8;
sh_a->block_align = 1152;
} else if ((track->a_formattag == 0x2000) /* AC3 */
|| track->a_formattag == MP_FOURCC('E', 'A', 'C', '3')
|| (track->a_formattag == 0x2001)) { /* DTS */
sh_a->bits_per_coded_sample = 0;
sh_a->bitrate = 0;
sh_a->block_align = 0;
} else if (track->a_formattag == 0x0001) { /* PCM || PCM_BE */
if (!strcmp(track->codec_id, MKV_A_PCM_BE))
sh->format = MP_FOURCC('t', 'w', 'o', 's');
} else if (track->a_formattag == 0x0003) { /* PCM_FLT */
/* ok */
} else if (!strcmp(track->codec_id, MKV_A_QDMC)
|| !strcmp(track->codec_id, MKV_A_QDMC2)) {
sh_a->bitrate = 16000 * 8;
sh_a->block_align = 1486;
if (!extradata_len) {
extradata = track->private_data;
extradata_len = track->private_size;
}
} else if (track->a_formattag == MP_FOURCC('M', 'P', '4', 'A')) {
int profile, srate_idx;
sh_a->bitrate = 16000 * 8;
sh_a->block_align = 1024;
if (!strcmp(track->codec_id, MKV_A_AAC) && track->private_data) {
if (!extradata_len) {
extradata = track->private_data;
extradata_len = track->private_size;
}
} else {
/* Recreate the 'private data' */
/* which faad2 uses in its initialization */
srate_idx = aac_get_sample_rate_index(track->a_sfreq);
if (!strncmp(&track->codec_id[12], "MAIN", 4))
profile = 0;
else if (!strncmp(&track->codec_id[12], "LC", 2))
profile = 1;
else if (!strncmp(&track->codec_id[12], "SSR", 3))
profile = 2;
else
profile = 3;
sh_a->codecdata = talloc_size(sh_a, 5);
sh_a->codecdata[0] = ((profile + 1) << 3) | ((srate_idx & 0xE) >> 1);
sh_a->codecdata[1] =
((srate_idx & 0x1) << 7) | (track->a_channels << 3);
if (strstr(track->codec_id, "SBR") != NULL) {
/* HE-AAC (aka SBR AAC) */
sh_a->codecdata_len = 5;
srate_idx = aac_get_sample_rate_index(sh_a->samplerate);
sh_a->codecdata[2] = AAC_SYNC_EXTENSION_TYPE >> 3;
sh_a->codecdata[3] = ((AAC_SYNC_EXTENSION_TYPE & 0x07) << 5) | 5;
sh_a->codecdata[4] = (1 << 7) | (srate_idx << 3);
track->default_duration = 1024.0 / (sh_a->samplerate / 2);
} else {
sh_a->codecdata_len = 2;
track->default_duration = 1024.0 / sh_a->samplerate;
}
}
} else if (track->a_formattag == MP_FOURCC('v', 'r', 'b', 's')) {
/* VORBIS */
if (track->private_size == 0 || (track->ms_compat && !extradata_len))
goto error;
if (!track->ms_compat) {
extradata = track->private_data;
extradata_len = track->private_size;
}
} else if (!strcmp(track->codec_id, MKV_A_OPUS)
|| !strcmp(track->codec_id, MKV_A_OPUS_EXP)) {
sh->format = MP_FOURCC('O', 'p', 'u', 's');
if (!track->ms_compat) {
extradata = track->private_data;
extradata_len = track->private_size;
}
} else if (!strncmp(track->codec_id, MKV_A_REALATRC, 7)) {
if (track->private_size < RAPROPERTIES4_SIZE)
goto error;
/* Common initialization for all RealAudio codecs */
unsigned char *src = track->private_data;
int codecdata_length, version;
unsigned int flavor;
sh_a->bitrate = 0; /* FIXME !? */
version = AV_RB16(src + 4);
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);
if (version == 4) {
src += RAPROPERTIES4_SIZE;
src += src[0] + 1;
src += src[0] + 1;
} else {
src += RAPROPERTIES5_SIZE;
}
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;
src += 3;
if (version == 5)
src++;
codecdata_length = AV_RB32(src);
if (codecdata_length < 0 || codecdata_length > 0x1000000)
goto error;
src += 4;
extradata_len = codecdata_length;
extradata = src;
switch (track->a_formattag) {
case MP_FOURCC('a', 't', 'r', 'c'):
if (flavor >= MP_ARRAY_SIZE(atrc_fl2bps))
goto error;
sh_a->bitrate = atrc_fl2bps[flavor] * 8;
sh_a->block_align = track->sub_packet_size;
goto audiobuf;
case MP_FOURCC('c', 'o', 'o', 'k'):
if (flavor >= MP_ARRAY_SIZE(cook_fl2bps))
goto error;
sh_a->bitrate = cook_fl2bps[flavor] * 8;
sh_a->block_align = track->sub_packet_size;
goto audiobuf;
case MP_FOURCC('s', 'i', 'p', 'r'):
if (flavor >= MP_ARRAY_SIZE(sipr_fl2bps))
goto error;
sh_a->bitrate = sipr_fl2bps[flavor] * 8;
sh_a->block_align = track->coded_framesize;
goto audiobuf;
case MP_FOURCC('2', '8', '_', '8'):
sh_a->bitrate = 3600 * 8;
sh_a->block_align = track->coded_framesize;
audiobuf:
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);
break;
}
track->realmedia = 1;
} else if (!strcmp(track->codec_id, MKV_A_FLAC)
|| (track->a_formattag == 0xf1ac)) {
unsigned char *ptr;
int size;
sh_a->bits_per_coded_sample = 0;
sh_a->bitrate = 0;
sh_a->block_align = 0;
if (!track->ms_compat) {
ptr = track->private_data;
size = track->private_size;
} else {
sh->format = MP_FOURCC('f', 'L', 'a', 'C');
ptr = extradata;
size = extradata_len;
}
if (size < 4 || ptr[0] != 'f' || ptr[1] != 'L' || ptr[2] != 'a'
|| ptr[3] != 'C') {
sh_a->codecdata = talloc_size(sh_a, 4);
sh_a->codecdata_len = 4;
memcpy(sh_a->codecdata, "fLaC", 4);
} else {
sh_a->codecdata = talloc_size(sh_a, size);
sh_a->codecdata_len = size;
memcpy(sh_a->codecdata, ptr, size);
}
} else if (!strcmp(track->codec_id, MKV_A_ALAC)) {
if (track->private_size && track->private_size < 10000000) {
sh_a->codecdata_len = track->private_size + 12;
sh_a->codecdata = talloc_size(sh_a, sh_a->codecdata_len);
char *data = sh_a->codecdata;
AV_WB32(data + 0, sh_a->codecdata_len);
memcpy(data + 4, "alac", 4);
AV_WB32(data + 8, 0);
memcpy(data + 12, track->private_data, track->private_size);
}
} else if (track->a_formattag == MP_FOURCC('W', 'V', 'P', 'K') ||
track->a_formattag == MP_FOURCC('T', 'R', 'H', 'D')) {
if (!track->ms_compat) {
extradata = track->private_data;
extradata_len = track->private_size;
}
} else if (track->a_formattag == MP_FOURCC('T', 'T', 'A', '1')) {
sh_a->codecdata_len = 30;
sh_a->codecdata = talloc_zero_size(sh_a, sh_a->codecdata_len);
if (!sh_a->codecdata)
goto error;
char *data = sh_a->codecdata;
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 (!track->ms_compat) {
goto error;
}
// 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(track->codec_id, MKV_A_AC3) == 0)
track->default_duration = 0;
mp_set_codec_from_tag(sh);
if (track->private_size > 0x1000000 || extradata_len > 0x1000000)
goto error;
if (!sh_a->codecdata && extradata) {
sh_a->codecdata = talloc_memdup(sh_a, extradata, extradata_len);
sh_a->codecdata_len = extradata_len;
}
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);
return 1;
}
static const char *const mkv_sub_tag[][2] = {
{ MKV_S_VOBSUB, "dvd_subtitle" },
{ MKV_S_TEXTSSA, "ass"},
{ MKV_S_TEXTASS, "ass"},
{ MKV_S_SSA, "ass"},
{ MKV_S_ASS, "ass"},
{ MKV_S_TEXTASCII, "subrip"},
{ MKV_S_TEXTUTF8, "subrip"},
{ MKV_S_PGS, "hdmv_pgs_subtitle"},
{ MKV_S_WEBVTT_S, "webvtt-webm"},
{ MKV_S_WEBVTT_C, "webvtt-webm"},
{ MKV_S_DVB, "dvb_subtitle"},
{0}
};
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;
bstr in = (bstr){track->private_data, track->private_size};
struct sh_stream *sh = new_sh_stream(demuxer, STREAM_SUB);
if (!sh)
return 1;
track->stream = sh;
sh_sub_t *sh_s = sh->sub;
sh->demuxer_id = track->tnum;
sh->codec = subtitle_type;
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_s->extradata = talloc_size(sh, track->private_size);
memcpy(sh_s->extradata, track->private_data, track->private_size);
sh_s->extradata_len = track->private_size;
if (track->language && (strcmp(track->language, "und") != 0))
sh->lang = talloc_strdup(sh, track->language);
sh->title = talloc_strdup(sh, track->name);
sh->default_track = track->default_track;
if (!subtitle_type)
MP_ERR(demuxer, "Subtitle type '%s' is not supported.\n", track->codec_id);
return 0;
}
static int read_ebml_header(demuxer_t *demuxer)
{
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;
if (ebml_master.doc_type.start == NULL) {
MP_VERBOSE(demuxer, "File has EBML header but no doctype."
" Assuming \"matroska\".\n");
} else if (bstrcmp(ebml_master.doc_type, bstr0("matroska")) != 0
&& bstrcmp(ebml_master.doc_type, bstr0("webm")) != 0) {
MP_DBG(demuxer, "no head found\n");
talloc_free(parse_ctx.talloc_ctx);
return 0;
}
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 (!s->eof) {
if (ebml_read_id(s) != MATROSKA_ID_SEGMENT) {
MP_VERBOSE(demuxer, "segment not found\n");
return 0;
}
MP_VERBOSE(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_VERBOSE(demuxer, " (skipping)\n");
if (*segment_end <= 0)
break;
int64_t end = 0;
stream_control(s, STREAM_CTRL_GET_SIZE, &end);
if (*segment_end >= end)
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;
bstr start = stream_peek(s, 4);
uint32_t start_id = 0;
for (int n = 0; n < start.len; n++)
start_id = (start_id << 8) | start.start[n];
if (start_id != EBML_ID_EBML)
return -1;
if (!read_ebml_header(demuxer))
return -1;
MP_VERBOSE(demuxer, "Found the head...\n");
if (!read_mkv_segment_header(demuxer, &end_pos))
return -1;
mkv_d = talloc_zero(demuxer, struct mkv_demuxer);
demuxer->priv = mkv_d;
mkv_d->tc_scale = 1000000;
mkv_d->segment_start = stream_tell(s);
mkv_d->segment_end = end_pos;
mkv_d->a_skip_preroll = 1;
if (demuxer->params && demuxer->params->matroska_was_valid)
*demuxer->params->matroska_was_valid = true;
while (1) {
start_pos = stream_tell(s);
stream_peek(s, 4); // make sure we can always seek back
uint32_t id = ebml_read_id(s);
if (s->eof) {
MP_WARN(demuxer, "Unexpected end of file (no clusters found)\n");
break;
}
if (id == MATROSKA_ID_CLUSTER) {
MP_VERBOSE(demuxer, "|+ found cluster\n");
break;
}
int res = read_header_element(demuxer, id, start_pos);
if (res < 0)
return -1;
}
// Read headers that come after the first cluster (i.e. require seeking).
// Note: reading might increase ->num_headers.
// Likewise, ->headers might be reallocated.
for (int n = 0; n < mkv_d->num_headers; n++) {
struct header_elem *elem = &mkv_d->headers[n];
if (elem->parsed)
continue;
elem->parsed = true;
if (elem->id == MATROSKA_ID_CUES) {
// Read cues when they are needed, to avoid seeking on opening.
MP_VERBOSE(demuxer, "Deferring reading cues.\n");
mkv_d->deferred_cues = elem->pos;
continue;
}
MP_VERBOSE(demuxer, "Seeking to %"PRIu64" to read header element 0x%x.\n",
elem->pos, (unsigned)elem->id);
int64_t end = 0;
stream_control(s, STREAM_CTRL_GET_SIZE, &end);
if (elem->pos >= end) {
MP_WARN(demuxer, "SeekHead position beyond "
"end of file - incomplete file?\n");
continue;
}
if (!stream_seek(s, elem->pos)) {
MP_WARN(demuxer, "Failed to seek when reading header element.\n");
continue;
}
if (ebml_read_id(s) != elem->id) {
MP_ERR(demuxer, "Expected element 0x%x not found\n",
(unsigned int)elem->id);
continue;
}
elem->parsed = false; // don't make read_header_element skip it
int res = read_header_element(demuxer, elem->id, elem->pos);
if (res < 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");
process_tags(demuxer);
display_create_tracks(demuxer);
if (demuxer->opts->mkv_probe_duration)
probe_last_timestamp(demuxer);
return 0;
}
static bool bstr_read_u8(bstr *buffer, uint8_t *out_u8)
{
if (buffer->len > 0) {
*out_u8 = buffer->start[0];
buffer->len -= 1;
buffer->start += 1;
return true;
} else {
return false;
}
}
static int demux_mkv_read_block_lacing(bstr *buffer, int *laces,
uint32_t lace_size[MAX_NUM_LACES])
{
uint32_t total = 0;
uint8_t flags, t;
int i;
/* lacing flags */
if (!bstr_read_u8(buffer, &flags))
goto error;
int type = (flags >> 1) & 0x03;
if (type == 0) { /* no lacing */
*laces = 1;
lace_size[0] = buffer->len;
} else {
if (!bstr_read_u8(buffer, &t))
goto error;
*laces = t + 1;
switch (type) {
case 1: /* xiph lacing */
for (i = 0; i < *laces - 1; i++) {
lace_size[i] = 0;
do {
if (!bstr_read_u8(buffer, &t))
goto error;
lace_size[i] += t;
} while (t == 0xFF);
total += lace_size[i];
}
lace_size[i] = buffer->len - total;
break;
case 2: /* fixed-size lacing */
for (i = 0; i < *laces; i++)
lace_size[i] = buffer->len / *laces;
break;
case 3:; /* EBML lacing */
uint64_t num = ebml_read_vlen_uint(buffer);
if (num == EBML_UINT_INVALID)
goto error;
if (num > buffer->len)
goto error;
total = lace_size[0] = num;
for (i = 1; i < *laces - 1; i++) {
int64_t snum = ebml_read_vlen_int(buffer);
if (snum == EBML_INT_INVALID)
goto error;
lace_size[i] = lace_size[i - 1] + snum;
total += lace_size[i];
}
lace_size[i] = buffer->len - total;
break;
default: abort();
}
}
total = buffer->len;
for (i = 0; i < *laces; i++) {
if (lace_size[i] > total)
goto error;
total -= lace_size[i];
}
if (total != 0)
goto error;
return 0;
error:
return 1;
}
static int64_t real_fix_timestamp(unsigned char *buf, int len, int64_t timestamp,
unsigned int format, int64_t *kf_base,
int *kf_pts)
{
if (format != MP_FOURCC('R', 'V', '3', '0') &&
format != MP_FOURCC('R', 'V', '4', '0'))
return timestamp;
if (len < 1) // invalid packet
return timestamp;
int offset = 1 + (buf[0] + 1) * 8;
if (offset + 4 > len) // invalid packet
return timestamp;
int hdr = AV_RB32(buf + offset);
int pict_type, pts;
if (format == MP_FOURCC('R', 'V', '3', '0')) {
pict_type = (hdr >> 27) & 3;
pts = (hdr >> 7) & 0x1FFF;
} else {
pict_type = (hdr >> 29) & 3;
pts = (hdr >> 6) & 0x1FFF;
}
if (pict_type != 3) {
*kf_base = timestamp;
*kf_pts = pts;
} else {
timestamp = *kf_base - ((*kf_pts - pts) & 0x1FFF);
}
return timestamp;
}
static void handle_realvideo(demuxer_t *demuxer, mkv_track_t *track,
bstr data, bool keyframe)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
demux_packet_t *dp;
int64_t timestamp = mkv_d->last_pts * 1000;
dp = new_demux_packet_from(data.start, data.len);
if (!dp)
return;
if (mkv_d->v_skip_to_keyframe) {
dp->pts = mkv_d->last_pts;
track->rv_kf_base = 0;
track->rv_kf_pts = 0;
} else {
dp->pts =
real_fix_timestamp(dp->buffer, dp->len, timestamp,
track->stream->format,
&track->rv_kf_base, &track->rv_kf_pts) * 0.001;
}
dp->pos = mkv_d->last_filepos;
dp->keyframe = keyframe;
demux_add_packet(track->stream, dp);
}
static void handle_realaudio(demuxer_t *demuxer, mkv_track_t *track,
bstr data, bool keyframe)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
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 = data.start;
uint32_t size = data.len;
demux_packet_t *dp;
// track->audio_buf allocation size
size_t audiobuf_size = sph * w;
if ((track->a_formattag == MP_FOURCC('2', '8', '_', '8'))
|| (track->a_formattag == MP_FOURCC('c', 'o', 'o', 'k'))
|| (track->a_formattag == MP_FOURCC('a', 't', 'r', 'c'))
|| (track->a_formattag == MP_FOURCC('s', 'i', 'p', 'r')))
{
switch (track->a_formattag) {
case MP_FOURCC('2', '8', '_', '8'):
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);
}
break;
case MP_FOURCC('c', 'o', 'o', 'k'):
case MP_FOURCC('a', 't', 'r', 'c'):
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);
}
break;
case MP_FOURCC('s', 'i', 'p', 'r'):
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;
int x = (i & 1) ?
(track->audio_buf[i / 2] >> 4) :
(track->audio_buf[i / 2] & 0x0F);
int y = (o & 1) ?
(track->audio_buf[o / 2] >> 4) :
(track->audio_buf[o / 2] & 0x0F);
if (o & 1)
track->audio_buf[o / 2] =
(track->audio_buf[o / 2] & 0x0F) | (x << 4);
else
track->audio_buf[o / 2] =
(track->audio_buf[o / 2] & 0xF0) | x;
if (i & 1)
track->audio_buf[i / 2] =
(track->audio_buf[i / 2] & 0x0F) | (y << 4);
else
track->audio_buf[i / 2] =
(track->audio_buf[i / 2] & 0xF0) | y;
++i;
++o;
}
}
}
break;
}
track->audio_timestamp[track->sub_packet_cnt] =
(track->ra_pts == mkv_d->last_pts) ? 0 : (mkv_d->last_pts);
track->ra_pts = mkv_d->last_pts;
if (track->sub_packet_cnt == 0)
track->audio_filepos = mkv_d->last_filepos;
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->audio->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 = track->audio_filepos; // all equal
dp->keyframe = !x; // Mark first packet as keyframe
demux_add_packet(track->stream, dp);
}
}
} else { // Not a codec that requires reordering
dp = new_demux_packet_from(buffer, size);
if (!dp)
goto error;
if (track->ra_pts == mkv_d->last_pts && !mkv_d->a_skip_to_keyframe)
dp->pts = MP_NOPTS_VALUE;
else
dp->pts = mkv_d->last_pts;
track->ra_pts = mkv_d->last_pts;
dp->pos = mkv_d->last_filepos;
dp->keyframe = keyframe;
demux_add_packet(track->stream, dp);
}
return;
error:
MP_ERR(demuxer, "RealAudio packet extraction or decryption error.\n");
}
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;
if (track->av_parser_codec) {
avcodec_close(track->av_parser_codec);
av_free(track->av_parser_codec);
}
track->av_parser_codec = NULL;
}
}
// 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 bool mkv_parse_packet(mkv_track_t *track, bstr *raw, bstr *out)
{
if (track->a_formattag == MP_FOURCC('W', 'V', 'P', 'K')) {
int size = raw->len;
uint8_t *parsed;
if (libav_parse_wavpack(track, raw->start, &parsed, &size) >= 0) {
out->start = parsed;
out->len = size;
*raw = (bstr){0};
return true;
}
} else if (track->codec_id && strcmp(track->codec_id, MKV_V_PRORES) == 0) {
size_t newlen = raw->len + 8;
char *data = talloc_size(track->parser_tmp, newlen);
AV_WB32(data + 0, newlen);
AV_WB32(data + 4, MKBETAG('i', 'c', 'p', 'f'));
memcpy(data + 8, raw->start, raw->len);
out->start = data;
out->len = newlen;
*raw = (bstr){0};
return true;
} else if (track->parse) {
if (!track->av_parser) {
int id = mp_codec_to_av_codec_id(track->stream->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->av_parser && track->av_parser_codec) {
while (raw->len) {
uint8_t *data;
int size;
int len = av_parser_parse2(track->av_parser, track->av_parser_codec,
&data, &size, raw->start, raw->len,
AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (len < 0 || len > 0x10000000)
return false;
*raw = bstr_cut(*raw, len);
if (size) {
out->start = data;
out->len = size;
return true;
}
}
return false;
}
}
// No parsing
*out = *raw;
*raw = (bstr){0};
return true;
}
struct block_info {
uint64_t duration, discardpadding;
bool simple, keyframe;
uint64_t timecode;
mkv_track_t *track;
bstr data;
void *alloc;
int64_t filepos;
};
static void free_block(struct block_info *block)
{
free(block->alloc);
block->alloc = NULL;
block->data = (bstr){0};
}
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;
int res = -1;
free_block(block);
length = ebml_read_length(s);
if (length > 500000000 || stream_tell(s) + length > (uint64_t)end)
goto exit;
block->alloc = malloc(length + AV_LZO_INPUT_PADDING);
if (!block->alloc)
goto exit;
block->data = (bstr){block->alloc, length};
block->filepos = stream_tell(s);
if (stream_read(s, block->data.start, block->data.len) != block->data.len)
goto exit;
// Parse header of the Block element
/* first byte(s): track num */
num = ebml_read_vlen_uint(&block->data);
if (num == EBML_UINT_INVALID)
goto exit;
/* time (relative to cluster time) */
if (block->data.len < 3)
goto exit;
time = block->data.start[0] << 8 | block->data.start[1];
block->data.start += 2;
block->data.len -= 2;
if (block->simple)
block->keyframe = block->data.start[0] & 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;
}
res = 1;
exit:
if (res <= 0)
free_block(block);
return res;
}
static int handle_block(demuxer_t *demuxer, struct block_info *block_info)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
int laces;
double current_pts;
bstr data = block_info->data;
bool keyframe = block_info->keyframe;
uint64_t block_duration = block_info->duration;
uint64_t tc = block_info->timecode;
mkv_track_t *track = block_info->track;
struct sh_stream *stream = track->stream;
uint32_t lace_size[MAX_NUM_LACES];
bool use_this_block = tc >= mkv_d->skip_to_timecode;
if (!demux_stream_is_selected(stream))
return 0;
if (demux_mkv_read_block_lacing(&data, &laces, lace_size)) {
MP_ERR(demuxer, "Bad input [lacing]\n");
return 0;
}
current_pts = tc / 1e9 - track->codec_delay;
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)
use_this_block = 1;
if (use_this_block) {
if (mkv_d->subtitle_preroll) {
mkv_d->subtitle_preroll--;
} else {
// This could overflow the demuxer queue.
if (mkv_d->a_skip_to_keyframe || mkv_d->v_skip_to_keyframe)
use_this_block = 0;
}
}
if (use_this_block) {
if (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) {
mkv_d->last_pts = current_pts;
mkv_d->last_filepos = block_info->filepos;
int p = 0;
for (int i = 0; i < laces; i++) {
bstr block = bstr_splice(data, 0, lace_size[i]);
if (stream->type == STREAM_VIDEO && track->realmedia)
handle_realvideo(demuxer, track, block, keyframe);
else if (stream->type == STREAM_AUDIO && track->realmedia)
handle_realaudio(demuxer, track, block, keyframe);
else {
bstr raw = demux_mkv_decode(demuxer->log, track, block, 1);
bstr buffer;
while (raw.start && mkv_parse_packet(track, &raw, &buffer)) {
demux_packet_t *dp =
new_demux_packet_from(buffer.start, buffer.len);
if (!dp)
break;
dp->keyframe = keyframe;
dp->pos = mkv_d->last_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 (p == 0 || (p == i && track->default_duration))
dp->pts = mkv_d->last_pts + p * track->default_duration;
if (track->ms_compat)
MPSWAP(double, dp->pts, dp->dts);
if (p == 0)
dp->duration = block_duration / 1e9;
if (stream->type == STREAM_AUDIO) {
unsigned int srate = track->a_sfreq;
demux_packet_set_padding(dp,
mkv_d->a_skip_preroll ? track->codec_delay * srate : 0,
block_info->discardpadding / 1e9 * srate);
mkv_d->a_skip_preroll = 0;
}
demux_add_packet(stream, dp);
p++;
}
talloc_free_children(track->parser_tmp);
}
data = bstr_cut(data, lace_size[i]);
}
if (stream->type == STREAM_VIDEO) {
mkv_d->v_skip_to_keyframe = 0;
mkv_d->skip_to_timecode = 0;
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;
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;
if (num)
block->keyframe = false;
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->data.start ? 1 : 0;
error:
free_block(block);
return -1;
}
static int read_next_block(demuxer_t *demuxer, struct block_info *block)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
stream_t *s = demuxer->stream;
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)
return 1;
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)
return 1;
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 (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) ||
ebml_read_skip(demuxer->log, -1, s) != 0)
{
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);
}
}
static int demux_mkv_fill_buffer(demuxer_t *demuxer)
{
for (;;) {
int res;
struct block_info block;
res = read_next_block(demuxer, &block);
if (res < 0)
return 0;
if (res > 0) {
index_block(demuxer, &block);
res = handle_block(demuxer, &block);
free_block(&block);
if (res > 0)
return 1;
}
}
}
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, uint64_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) {
if (index)
stream_seek(s, index->filepos);
MP_VERBOSE(demuxer, "creating index until TC %" PRIu64 "\n", timecode);
for (;;) {
int res;
struct block_info block;
res = read_next_block(demuxer, &block);
if (res < 0)
break;
if (res > 0) {
index_block(demuxer, &block);
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;
/* Find the entry in the index closest to the target timecode in the
* give direction. If there are no such entries - we're trying to seek
* backward from a target time before the first entry or forward from a
* target time after the last entry - then still seek to the first/last
* entry if that's further in the direction wanted than mkv_d->last_pts.
*/
int64_t min_diff = target_timecode - (int64_t)(mkv_d->last_pts * 1e9 + 0.5);
if (flags & SEEK_BACKWARD)
min_diff = -min_diff;
min_diff = FFMAX(min_diff, 1);
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 =
target_timecode -
(int64_t) (mkv_d->indexes[i].timecode * mkv_d->tc_scale);
if (flags & SEEK_BACKWARD)
diff = -diff;
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_SUBPREROLL) {
// Find the cluster with the highest filepos, that has a timestamp
// still lower than min_tc.
double secs = demuxer->opts->mkv_subtitle_preroll_secs;
uint64_t pre = MPMIN(INT64_MAX, secs * 1e9 / mkv_d->tc_scale);
uint64_t min_tc = pre < index->timecode ? index->timecode - pre : 0;
uint64_t prev_target = 0;
uint64_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 rel_seek_secs, 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;
if (!st_active[STREAM_SUB] || !st_active[STREAM_VIDEO])
flags &= ~SEEK_SUBPREROLL;
// Adjust the target a little bit to catch cases where the target position
// specifies a keyframe with high, but not perfect, precision.
rel_seek_secs += flags & SEEK_FORWARD ? -0.005 : 0.005;
if (!(flags & SEEK_FACTOR)) { /* time in secs */
mkv_index_t *index = NULL;
if (!(flags & SEEK_ABSOLUTE)) /* relative seek */
rel_seek_secs += mkv_d->last_pts;
rel_seek_secs = FFMAX(rel_seek_secs, 0);
int64_t target_timecode = rel_seek_secs * 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
: 0;
}
} else {
stream_t *s = demuxer->stream;
read_deferred_cues(demuxer);
int64_t size = 0;
stream_control(s, STREAM_CTRL_GET_SIZE, &size);
int64_t target_filepos = size * MPCLAMP(rel_seek_secs, 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, target_filepos);
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;
demux_mkv_fill_buffer(demuxer);
}
static void probe_last_timestamp(struct demuxer *demuxer)
{
mkv_demuxer_t *mkv_d = demuxer->priv;
int64_t old_pos = stream_tell(demuxer->stream);
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;
read_deferred_cues(demuxer);
if (!mkv_d->index_complete)
return;
// 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;
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])
mkv_d->duration = last_ts[STREAM_VIDEO] / 1e9;
stream_seek(demuxer->stream, old_pos);
mkv_d->cluster_start = mkv_d->cluster_end = 0;
}
static int demux_mkv_control(demuxer_t *demuxer, int cmd, void *arg)
{
mkv_demuxer_t *mkv_d = (mkv_demuxer_t *) demuxer->priv;
switch (cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (mkv_d->duration == 0)
return DEMUXER_CTRL_DONTKNOW;
*((double *) arg) = (double) mkv_d->duration;
return DEMUXER_CTRL_OK;
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
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",
.type = DEMUXER_TYPE_MATROSKA,
.open = demux_mkv_open,
.fill_buffer = demux_mkv_fill_buffer,
.close = mkv_free,
.seek = demux_mkv_seek,
.control = demux_mkv_control
};
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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