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mpv/demux/demux_lavf.c
wm4 de28876222 demux: minor simplification 
Oops, should have been part of commit 37085788.
2014-07-06 19:02:21 +02:00

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/*
* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* 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 <stdio.h>
#include <stdlib.h>
// #include <unistd.h>
#include <limits.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include "config.h"
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/avutil.h>
#include <libavutil/avstring.h>
#include <libavutil/mathematics.h>
#if HAVE_AVCODEC_REPLAYGAIN_SIDE_DATA
# include <libavutil/replaygain.h>
#endif
#if HAVE_AV_DISPLAYMATRIX
# include <libavutil/display.h>
#endif
#include <libavutil/opt.h>
#include "compat/libav.h"
#include "options/options.h"
#include "common/msg.h"
#include "common/tags.h"
#include "common/av_opts.h"
#include "common/av_common.h"
#include "bstr/bstr.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "options/m_option.h"
#define INITIAL_PROBE_SIZE STREAM_BUFFER_SIZE
#define PROBE_BUF_SIZE FFMIN(STREAM_MAX_BUFFER_SIZE, 2 * 1024 * 1024)
// Should correspond to IO_BUFFER_SIZE in libavformat/aviobuf.c (not public)
// libavformat (almost) always reads data in blocks of this size.
#define BIO_BUFFER_SIZE 32768
#define OPT_BASE_STRUCT struct demux_lavf_opts
struct demux_lavf_opts {
int probesize;
int probescore;
float analyzeduration;
int buffersize;
int allow_mimetype;
char *format;
char *cryptokey;
char *avopt;
int genptsmode;
};
const struct m_sub_options demux_lavf_conf = {
.opts = (const m_option_t[]) {
OPT_INTRANGE("probesize", probesize, 0, 32, INT_MAX),
OPT_STRING("format", format, 0),
OPT_FLOATRANGE("analyzeduration", analyzeduration, 0, 0, 3600),
OPT_INTRANGE("buffersize", buffersize, 0, 1, 10 * 1024 * 1024,
OPTDEF_INT(BIO_BUFFER_SIZE)),
OPT_FLAG("allow-mimetype", allow_mimetype, 0),
OPT_INTRANGE("probescore", probescore, 0, 0, 100),
OPT_STRING("cryptokey", cryptokey, 0),
OPT_CHOICE("genpts-mode", genptsmode, 0,
({"lavf", 1}, {"no", 0})),
OPT_STRING("o", avopt, 0),
{0}
},
.size = sizeof(struct demux_lavf_opts),
.defaults = &(const struct demux_lavf_opts){
.allow_mimetype = 1,
},
};
typedef struct lavf_priv {
char *filename;
const struct format_hack *format_hack;
AVInputFormat *avif;
AVFormatContext *avfc;
AVIOContext *pb;
int64_t last_pts;
struct sh_stream **streams; // NULL for unknown streams
int num_streams;
int cur_program;
char *mime_type;
} lavf_priv_t;
struct format_hack {
const char *ff_name;
const char *mime_type;
int probescore;
float analyzeduration;
bool max_probe; // use probescore only if max. probe size reached
};
static const struct format_hack format_hacks[] = {
// for webradios
{"aac", "audio/aacp", 25, 0.5},
{"aac", "audio/aac", 25, 0.5},
// some mp3 files don't detect correctly
{"mp3", "audio/mpeg", 24, 0.5},
{"mp3", NULL, 24, .max_probe = true},
{0}
};
static const char *const format_blacklist[] = {
"tty", // Useless non-sense, sometimes breaks MLP2 subreader.c fallback
// Image demuxers, disabled in favor of demux_mf:
"image2", "image2pipe",
"bmp_pipe", "dpx_pipe", "exr_pipe", "j2k_pipe", "png_pipe", "tiff_pipe",
0
};
static int mp_read(void *opaque, uint8_t *buf, int size)
{
struct demuxer *demuxer = opaque;
struct stream *stream = demuxer->stream;
int ret;
ret = stream_read(stream, buf, size);
MP_TRACE(demuxer, "%d=mp_read(%p, %p, %d), pos: %"PRId64", eof:%d\n",
ret, stream, buf, size, stream_tell(stream), stream->eof);
return ret;
}
static int64_t mp_seek(void *opaque, int64_t pos, int whence)
{
struct demuxer *demuxer = opaque;
struct stream *stream = demuxer->stream;
int64_t current_pos;
MP_TRACE(demuxer, "mp_seek(%p, %"PRId64", %d)\n", stream, pos, whence);
if (whence == SEEK_END || whence == AVSEEK_SIZE) {
int64_t end;
if (stream_control(stream, STREAM_CTRL_GET_SIZE, &end) != STREAM_OK)
return -1;
if (whence == AVSEEK_SIZE)
return end;
pos += end;
} else if (whence == SEEK_CUR) {
pos += stream_tell(stream);
} else if (whence != SEEK_SET) {
return -1;
}
if (pos < 0)
return -1;
current_pos = stream_tell(stream);
if (stream_seek(stream, pos) == 0) {
stream_seek(stream, current_pos);
return -1;
}
return pos;
}
static int64_t mp_read_seek(void *opaque, int stream_idx, int64_t ts, int flags)
{
struct demuxer *demuxer = opaque;
struct stream *stream = demuxer->stream;
struct lavf_priv *priv = demuxer->priv;
AVStream *st = priv->avfc->streams[stream_idx];
double pts = (double)ts * st->time_base.num / st->time_base.den;
int ret = stream_control(stream, STREAM_CTRL_SEEK_TO_TIME, &pts);
return ret < 1 ? AVERROR(ENOSYS) : 0;
}
static void list_formats(struct demuxer *demuxer)
{
MP_INFO(demuxer, "Available lavf input formats:\n");
AVInputFormat *fmt = NULL;
while ((fmt = av_iformat_next(fmt)))
MP_INFO(demuxer, "%15s : %s\n", fmt->name, fmt->long_name);
}
static char *remove_prefix(char *s, const char *const *prefixes)
{
for (int n = 0; prefixes[n]; n++) {
int len = strlen(prefixes[n]);
if (strncmp(s, prefixes[n], len) == 0)
return s + len;
}
return s;
}
static const char *const prefixes[] =
{"ffmpeg://", "lavf://", "avdevice://", "av://", NULL};
static int lavf_check_file(demuxer_t *demuxer, enum demux_check check)
{
struct MPOpts *opts = demuxer->opts;
struct demux_lavf_opts *lavfdopts = opts->demux_lavf;
struct stream *s = demuxer->stream;
lavf_priv_t *priv;
assert(!demuxer->priv);
demuxer->priv = talloc_zero(NULL, lavf_priv_t);
priv = demuxer->priv;
priv->filename = s->url;
if (!priv->filename) {
priv->filename = "mp:unknown";
MP_WARN(demuxer, "Stream url is not set!\n");
}
priv->filename = remove_prefix(priv->filename, prefixes);
char *avdevice_format = NULL;
if (s->type == STREAMTYPE_AVDEVICE) {
// always require filename in the form "format:filename"
char *sep = strchr(priv->filename, ':');
if (!sep) {
MP_FATAL(demuxer, "Must specify filename in 'format:filename' form\n");
return -1;
}
avdevice_format = talloc_strndup(priv, priv->filename,
sep - priv->filename);
priv->filename = sep + 1;
}
char *mime_type = demuxer->stream->mime_type;
if (!lavfdopts->allow_mimetype || !mime_type)
mime_type = "";
const char *format = lavfdopts->format;
if (!format)
format = s->lavf_type;
if (!format)
format = avdevice_format;
if (format) {
if (strcmp(format, "help") == 0) {
list_formats(demuxer);
return -1;
}
priv->avif = av_find_input_format(format);
if (!priv->avif) {
MP_FATAL(demuxer, "Unknown lavf format %s\n", format);
return -1;
}
MP_VERBOSE(demuxer, "Forced lavf %s demuxer\n", priv->avif->long_name);
goto success;
}
// AVPROBE_SCORE_MAX/4 + 1 is the "recommended" limit. Below that, the user
// is supposed to retry with larger probe sizes until a higher value is
// reached.
int min_probe = AVPROBE_SCORE_MAX/4 + 1;
if (lavfdopts->probescore)
min_probe = lavfdopts->probescore;
AVProbeData avpd = {
// Disable file-extension matching with normal checks
.filename = check <= DEMUX_CHECK_REQUEST ? priv->filename : "",
.buf_size = 0,
.buf = av_mallocz(PROBE_BUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE),
};
bool final_probe = false;
do {
int nsize = av_clip(avpd.buf_size * 2, INITIAL_PROBE_SIZE,
PROBE_BUF_SIZE);
bstr buf = stream_peek(s, nsize);
if (buf.len <= avpd.buf_size)
final_probe = true;
memcpy(avpd.buf, buf.start, buf.len);
avpd.buf_size = buf.len;
int score = 0;
priv->avif = av_probe_input_format2(&avpd, avpd.buf_size > 0, &score);
if (priv->avif) {
MP_VERBOSE(demuxer, "Found '%s' at score=%d size=%d.\n",
priv->avif->name, score, avpd.buf_size);
priv->format_hack = NULL;
for (int n = 0; format_hacks[n].ff_name; n++) {
const struct format_hack *entry = &format_hacks[n];
if (strcmp(entry->ff_name, priv->avif->name) != 0)
continue;
if (entry->mime_type && strcasecmp(entry->mime_type, mime_type) != 0)
continue;
priv->format_hack = entry;
break;
}
if (score >= min_probe)
break;
if (priv->format_hack) {
if (score >= priv->format_hack->probescore &&
(!priv->format_hack->max_probe || final_probe))
break;
}
}
priv->avif = NULL;
priv->format_hack = NULL;
} while (!final_probe);
av_free(avpd.buf);
if (priv->avif && !format) {
for (int n = 0; format_blacklist[n]; n++) {
if (strcmp(format_blacklist[n], priv->avif->name) == 0) {
MP_VERBOSE(demuxer, "Format blacklisted.\n");
priv->avif = NULL;
break;
}
}
}
if (!priv->avif) {
MP_VERBOSE(demuxer, "No format found, try lowering probescore or forcing the format.\n");
return -1;
}
success:
demuxer->filetype = priv->avif->long_name;
if (!demuxer->filetype)
demuxer->filetype = priv->avif->name;
return 0;
}
static bool matches_avinputformat_name(struct lavf_priv *priv,
const char *name)
{
// At least mp4 has name="mov,mp4,m4a,3gp,3g2,mj2", so we split the name
// on "," in general.
const char *avifname = priv->avif->name;
while (1) {
const char *next = strchr(avifname, ',');
if (!next)
return !strcmp(avifname, name);
int len = next - avifname;
if (len == strlen(name) && !memcmp(avifname, name, len))
return true;
avifname = next + 1;
}
}
static uint8_t char2int(char c)
{
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'a' && c <= 'f') return c - 'a' + 10;
if (c >= 'A' && c <= 'F') return c - 'A' + 10;
return 0;
}
static void parse_cryptokey(AVFormatContext *avfc, const char *str)
{
int len = strlen(str) / 2;
uint8_t *key = av_mallocz(len);
int i;
avfc->keylen = len;
avfc->key = key;
for (i = 0; i < len; i++, str += 2)
*key++ = (char2int(str[0]) << 4) | char2int(str[1]);
}
static void select_tracks(struct demuxer *demuxer, int start)
{
lavf_priv_t *priv = demuxer->priv;
for (int n = start; n < priv->num_streams; n++) {
struct sh_stream *stream = priv->streams[n];
AVStream *st = priv->avfc->streams[n];
bool selected = stream && demux_stream_is_selected(stream) &&
!stream->attached_picture;
st->discard = selected ? AVDISCARD_DEFAULT : AVDISCARD_ALL;
}
}
static void export_replaygain(demuxer_t *demuxer, sh_audio_t *sh, AVStream *st)
{
#if HAVE_AVCODEC_REPLAYGAIN_SIDE_DATA
for (int i = 0; i < st->nb_side_data; i++) {
AVReplayGain *av_rgain;
struct replaygain_data *rgain;
AVPacketSideData *src_sd = &st->side_data[i];
if (src_sd->type != AV_PKT_DATA_REPLAYGAIN)
continue;
av_rgain = (AVReplayGain*)src_sd->data;
rgain = talloc_ptrtype(demuxer, rgain);
rgain->track_gain = (av_rgain->track_gain != INT32_MIN) ?
av_rgain->track_gain / 100000.0f : 0.0;
rgain->track_peak = (av_rgain->track_peak != 0.0) ?
av_rgain->track_peak / 100000.0f : 1.0;
rgain->album_gain = (av_rgain->album_gain != INT32_MIN) ?
av_rgain->album_gain / 100000.0f : 0.0;
rgain->album_peak = (av_rgain->album_peak != 0.0) ?
av_rgain->album_peak / 100000.0f : 1.0;
sh->replaygain_data = rgain;
}
#endif
}
static void handle_stream(demuxer_t *demuxer, int i)
{
lavf_priv_t *priv = demuxer->priv;
AVFormatContext *avfc = priv->avfc;
AVStream *st = avfc->streams[i];
AVCodecContext *codec = st->codec;
struct sh_stream *sh = NULL;
switch (codec->codec_type) {
case AVMEDIA_TYPE_AUDIO: {
sh = new_sh_stream(demuxer, STREAM_AUDIO);
if (!sh)
break;
sh_audio_t *sh_audio = sh->audio;
sh->format = codec->codec_tag;
// probably unneeded
mp_chmap_from_channels(&sh_audio->channels, codec->channels);
if (codec->channel_layout)
mp_chmap_from_lavc(&sh_audio->channels, codec->channel_layout);
sh_audio->samplerate = codec->sample_rate;
sh_audio->bitrate = codec->bit_rate;
export_replaygain(demuxer, sh_audio, st);
break;
}
case AVMEDIA_TYPE_VIDEO: {
sh = new_sh_stream(demuxer, STREAM_VIDEO);
if (!sh)
break;
sh_video_t *sh_video = sh->video;
if (st->disposition & AV_DISPOSITION_ATTACHED_PIC) {
sh->attached_picture = new_demux_packet_from(st->attached_pic.data,
st->attached_pic.size);
sh->attached_picture->pts = 0;
talloc_steal(sh, sh->attached_picture);
sh->attached_picture->keyframe = true;
}
sh->format = codec->codec_tag;
sh_video->disp_w = codec->width;
sh_video->disp_h = codec->height;
/* Try to make up some frame rate value, even if it's not reliable.
* FPS information is needed to support subtitle formats which base
* timing on frame numbers.
* Libavformat seems to report no "reliable" FPS value for AVI files,
* while they are typically constant enough FPS that the value this
* heuristic makes up works with subtitles in practice.
*/
double fps;
if (st->avg_frame_rate.num)
fps = av_q2d(st->avg_frame_rate);
else
fps = 1.0 / FFMAX(av_q2d(st->time_base),
av_q2d(st->codec->time_base) *
st->codec->ticks_per_frame);
sh_video->fps = fps;
if (st->sample_aspect_ratio.num)
sh_video->aspect = codec->width * st->sample_aspect_ratio.num
/ (float)(codec->height * st->sample_aspect_ratio.den);
else
sh_video->aspect = codec->width * codec->sample_aspect_ratio.num
/ (float)(codec->height * codec->sample_aspect_ratio.den);
sh_video->bitrate = codec->bit_rate;
if (sh_video->bitrate == 0)
sh_video->bitrate = avfc->bit_rate;
#if HAVE_AV_DISPLAYMATRIX
uint8_t *sd = av_stream_get_side_data(st, AV_PKT_DATA_DISPLAYMATRIX, NULL);
if (sd)
sh_video->rotate = av_display_rotation_get((uint32_t *)sd);
#else
AVDictionaryEntry *rot = av_dict_get(st->metadata, "rotate", NULL, 0);
if (rot && rot->value) {
char *end = NULL;
long int r = strtol(rot->value, &end, 10);
if (end && !end[0])
sh_video->rotate = r;
}
#endif
sh_video->rotate = ((sh_video->rotate % 360) + 360) % 360;
// This also applies to vfw-muxed mkv, but we can't detect these easily.
sh_video->avi_dts = matches_avinputformat_name(priv, "avi");
break;
}
case AVMEDIA_TYPE_SUBTITLE: {
sh_sub_t *sh_sub;
sh = new_sh_stream(demuxer, STREAM_SUB);
if (!sh)
break;
sh_sub = sh->sub;
if (codec->extradata_size) {
sh_sub->extradata = talloc_size(sh, codec->extradata_size);
memcpy(sh_sub->extradata, codec->extradata, codec->extradata_size);
sh_sub->extradata_len = codec->extradata_size;
}
sh_sub->w = codec->width;
sh_sub->h = codec->height;
if (matches_avinputformat_name(priv, "microdvd")) {
AVRational r;
if (av_opt_get_q(avfc, "subfps", AV_OPT_SEARCH_CHILDREN, &r) >= 0) {
// File headers don't have a FPS set.
if (r.num < 1 || r.den < 1)
sh_sub->frame_based = av_q2d(av_inv_q(codec->time_base));
} else {
// Older libavformat versions. If the FPS matches the microdvd
// reader's default, assume it uses frame based timing.
if (codec->time_base.num == 125 && codec->time_base.den == 2997)
sh_sub->frame_based = 23.976;
}
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT: {
AVDictionaryEntry *ftag = av_dict_get(st->metadata, "filename",
NULL, 0);
char *filename = ftag ? ftag->value : NULL;
char *mimetype = NULL;
switch (st->codec->codec_id) {
case AV_CODEC_ID_TTF: mimetype = "application/x-truetype-font"; break;
#if LIBAVFORMAT_VERSION_MICRO >= 100
case AV_CODEC_ID_OTF: mimetype = "application/vnd.ms-opentype"; break;
#endif
}
if (mimetype) {
demuxer_add_attachment(demuxer, bstr0(filename), bstr0(mimetype),
(struct bstr){codec->extradata,
codec->extradata_size});
}
break;
}
default: ;
}
assert(priv->num_streams == i); // directly mapped
MP_TARRAY_APPEND(priv, priv->streams, priv->num_streams, sh);
if (sh) {
sh->codec = mp_codec_from_av_codec_id(codec->codec_id);
sh->lav_headers = codec;
if (st->disposition & AV_DISPOSITION_DEFAULT)
sh->default_track = 1;
if (matches_avinputformat_name(priv, "mpeg") ||
matches_avinputformat_name(priv, "mpegts"))
sh->demuxer_id = st->id;
AVDictionaryEntry *title = av_dict_get(st->metadata, "title", NULL, 0);
if (title && title->value)
sh->title = talloc_strdup(sh, title->value);
AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
if (lang && lang->value)
sh->lang = talloc_strdup(sh, lang->value);
}
select_tracks(demuxer, i);
}
// Add any new streams that might have been added
static void add_new_streams(demuxer_t *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
while (priv->num_streams < priv->avfc->nb_streams)
handle_stream(demuxer, priv->num_streams);
}
static void update_metadata(demuxer_t *demuxer, AVPacket *pkt)
{
#if HAVE_AVCODEC_METADATA_UPDATE_SIDE_DATA
int md_size;
const uint8_t *md;
md = av_packet_get_side_data(pkt, AV_PKT_DATA_METADATA_UPDATE, &md_size);
if (md) {
AVDictionary *dict = NULL;
av_packet_unpack_dictionary(md, md_size, &dict);
if (dict) {
mp_tags_clear(demuxer->metadata);
mp_tags_copy_from_av_dictionary(demuxer->metadata, dict);
av_dict_free(&dict);
demuxer->events |= DEMUX_EVENT_METADATA;
}
}
#endif
}
static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check)
{
struct MPOpts *opts = demuxer->opts;
struct demux_lavf_opts *lavfdopts = opts->demux_lavf;
AVFormatContext *avfc;
AVDictionaryEntry *t = NULL;
float analyze_duration = 0;
int i;
if (lavf_check_file(demuxer, check) < 0)
return -1;
lavf_priv_t *priv = demuxer->priv;
if (!priv)
return -1;
avfc = avformat_alloc_context();
if (lavfdopts->cryptokey)
parse_cryptokey(avfc, lavfdopts->cryptokey);
if (lavfdopts->genptsmode)
avfc->flags |= AVFMT_FLAG_GENPTS;
if (opts->index_mode != 1)
avfc->flags |= AVFMT_FLAG_IGNIDX;
#if LIBAVFORMAT_VERSION_MICRO >= 100
/* Keep side data as side data instead of mashing it into the packet
* stream.
* Note: Libav doesn't have this horrible insanity. */
av_opt_set(avfc, "fflags", "+keepside", 0);
#endif
if (lavfdopts->probesize) {
if (av_opt_set_int(avfc, "probesize", lavfdopts->probesize, 0) < 0)
MP_ERR(demuxer, "couldn't set option probesize to %u\n",
lavfdopts->probesize);
}
if (priv->format_hack && priv->format_hack->analyzeduration)
analyze_duration = priv->format_hack->analyzeduration;
if (lavfdopts->analyzeduration)
analyze_duration = lavfdopts->analyzeduration;
if (analyze_duration > 0) {
if (av_opt_set_int(avfc, "analyzeduration",
analyze_duration * AV_TIME_BASE, 0) < 0)
MP_ERR(demuxer, "demux_lavf, couldn't set option "
"analyzeduration to %f\n", analyze_duration);
}
if (lavfdopts->avopt) {
if (parse_avopts(avfc, lavfdopts->avopt) < 0) {
MP_ERR(demuxer, "Your options /%s/ look like gibberish to me pal\n",
lavfdopts->avopt);
return -1;
}
}
if ((priv->avif->flags & AVFMT_NOFILE) ||
demuxer->stream->type == STREAMTYPE_AVDEVICE)
{
// This might be incorrect.
demuxer->seekable = true;
} else {
void *buffer = av_malloc(lavfdopts->buffersize);
if (!buffer)
return -1;
priv->pb = avio_alloc_context(buffer, lavfdopts->buffersize, 0,
demuxer, mp_read, NULL, mp_seek);
if (!priv->pb) {
av_free(buffer);
return -1;
}
priv->pb->read_seek = mp_read_seek;
priv->pb->seekable = demuxer->seekable ? AVIO_SEEKABLE_NORMAL : 0;
avfc->pb = priv->pb;
}
AVDictionary *dopts = NULL;
if (matches_avinputformat_name(priv, "rtsp")) {
const char *transport = NULL;
switch (opts->network_rtsp_transport) {
case 1: transport = "udp"; break;
case 2: transport = "tcp"; break;
case 3: transport = "http"; break;
}
if (transport)
av_dict_set(&dopts, "rtsp_transport", transport, 0);
}
if (avformat_open_input(&avfc, priv->filename, priv->avif, &dopts) < 0) {
MP_ERR(demuxer, "avformat_open_input() failed\n");
av_dict_free(&dopts);
return -1;
}
t = NULL;
while ((t = av_dict_get(dopts, "", t, AV_DICT_IGNORE_SUFFIX)))
MP_VERBOSE(demuxer, "Could not set demux option %s=%s\n", t->key, t->value);
av_dict_free(&dopts);
priv->avfc = avfc;
if (avformat_find_stream_info(avfc, NULL) < 0) {
MP_ERR(demuxer, "av_find_stream_info() failed\n");
return -1;
}
MP_VERBOSE(demuxer, "avformat_find_stream_info() finished after %"PRId64
" bytes.\n", stream_tell(demuxer->stream));
for (i = 0; i < avfc->nb_chapters; i++) {
AVChapter *c = avfc->chapters[i];
uint64_t start = av_rescale_q(c->start, c->time_base,
(AVRational){1, 1000000000});
uint64_t end = av_rescale_q(c->end, c->time_base,
(AVRational){1, 1000000000});
t = av_dict_get(c->metadata, "title", NULL, 0);
int index = demuxer_add_chapter(demuxer, t ? bstr0(t->value) : bstr0(""),
start, end, i);
mp_tags_copy_from_av_dictionary(demuxer->chapters[index].metadata, c->metadata);
}
add_new_streams(demuxer);
mp_tags_copy_from_av_dictionary(demuxer->metadata, avfc->metadata);
// Often useful with OGG audio-only files, which have metadata in the audio
// track metadata instead of the main metadata.
if (demuxer->num_streams == 1) {
for (int n = 0; n < priv->num_streams; n++) {
if (priv->streams[n])
mp_tags_copy_from_av_dictionary(demuxer->metadata, avfc->streams[n]->metadata);
}
}
demuxer->ts_resets_possible = priv->avif->flags & AVFMT_TS_DISCONT;
demuxer->start_time = priv->avfc->start_time == AV_NOPTS_VALUE ?
0 : (double)priv->avfc->start_time / AV_TIME_BASE;
return 0;
}
static void destroy_avpacket(void *pkt)
{
av_free_packet(pkt);
}
static int demux_lavf_fill_buffer(demuxer_t *demux)
{
lavf_priv_t *priv = demux->priv;
demux_packet_t *dp;
AVPacket *pkt = talloc(NULL, AVPacket);
if (av_read_frame(priv->avfc, pkt) < 0) {
talloc_free(pkt);
return 0; // eof
}
talloc_set_destructor(pkt, destroy_avpacket);
add_new_streams(demux);
update_metadata(demux, pkt);
assert(pkt->stream_index >= 0 && pkt->stream_index < priv->num_streams);
struct sh_stream *stream = priv->streams[pkt->stream_index];
AVStream *st = priv->avfc->streams[pkt->stream_index];
if (!demux_stream_is_selected(stream)) {
talloc_free(pkt);
return 1; // don't signal EOF if skipping a packet
}
// If the packet has pointers to temporary fields that could be
// overwritten/freed by next av_read_frame(), copy them to persistent
// allocations so we can safely queue the packet for any length of time.
if (av_dup_packet(pkt) < 0)
abort();
dp = new_demux_packet_fromdata(pkt->data, pkt->size);
dp->avpacket = talloc_steal(dp, pkt);
if (pkt->pts != AV_NOPTS_VALUE)
dp->pts = pkt->pts * av_q2d(st->time_base);
if (pkt->dts != AV_NOPTS_VALUE)
dp->dts = pkt->dts * av_q2d(st->time_base);
dp->duration = pkt->duration * av_q2d(st->time_base);
if (pkt->convergence_duration > 0)
dp->duration = pkt->convergence_duration * av_q2d(st->time_base);
dp->pos = pkt->pos;
dp->keyframe = pkt->flags & AV_PKT_FLAG_KEY;
if (dp->pts != MP_NOPTS_VALUE) {
priv->last_pts = dp->pts * AV_TIME_BASE;
} else if (dp->dts != MP_NOPTS_VALUE) {
priv->last_pts = dp->dts * AV_TIME_BASE;
}
demux_add_packet(stream, dp);
return 1;
}
static void demux_seek_lavf(demuxer_t *demuxer, float rel_seek_secs, int flags)
{
lavf_priv_t *priv = demuxer->priv;
int avsflags = 0;
if (flags & SEEK_ABSOLUTE)
priv->last_pts = 0;
else if (rel_seek_secs < 0)
avsflags = AVSEEK_FLAG_BACKWARD;
if (flags & SEEK_FORWARD)
avsflags = 0;
else if (flags & SEEK_BACKWARD)
avsflags = AVSEEK_FLAG_BACKWARD;
if (flags & SEEK_FACTOR) {
struct stream *s = demuxer->stream;
int64_t end = 0;
stream_control(s, STREAM_CTRL_GET_SIZE, &end);
if (end > 0 && demuxer->ts_resets_possible &&
!(priv->avif->flags & AVFMT_NO_BYTE_SEEK))
{
avsflags |= AVSEEK_FLAG_BYTE;
priv->last_pts = end * rel_seek_secs;
} else if (priv->avfc->duration != 0 &&
priv->avfc->duration != AV_NOPTS_VALUE)
{
priv->last_pts = rel_seek_secs * priv->avfc->duration;
}
} else {
priv->last_pts += rel_seek_secs * AV_TIME_BASE;
}
if (!priv->avfc->iformat->read_seek2) {
// Normal seeking.
int r = av_seek_frame(priv->avfc, -1, priv->last_pts, avsflags);
if (r < 0 && (avsflags & AVSEEK_FLAG_BACKWARD)) {
// When seeking before the beginning of the file, and seeking fails,
// try again without the backwards flag to make it seek to the
// beginning.
avsflags &= ~AVSEEK_FLAG_BACKWARD;
av_seek_frame(priv->avfc, -1, priv->last_pts, avsflags);
}
} else {
// av_seek_frame() won't work. Use "new" seeking API. We don't use this
// API by default, because there are some major issues.
// Set max_ts==ts, so that demuxing starts from an earlier position in
// the worst case.
// To make this horrible situation even worse, some lavf demuxers have
// broken timebase handling (everything that uses
// ff_subtitles_queue_seek()), and always uses the stream timebase. So
// we use the timebase and stream index of the first enabled stream
// (i.e. a stream which can participate in seeking).
int stream_index = -1;
AVRational time_base = {1, AV_TIME_BASE};
for (int n = 0; n < priv->num_streams; n++) {
struct sh_stream *stream = priv->streams[n];
AVStream *st = priv->avfc->streams[n];
if (stream && st->discard != AVDISCARD_ALL) {
stream_index = n;
time_base = st->time_base;
break;
}
}
int64_t pts = priv->last_pts;
if (pts != AV_NOPTS_VALUE)
pts = pts / (double)AV_TIME_BASE * av_q2d(av_inv_q(time_base));
int r = avformat_seek_file(priv->avfc, stream_index, INT64_MIN,
pts, pts, avsflags);
// Similar issue as in the normal seeking codepath.
if (r < 0) {
avformat_seek_file(priv->avfc, stream_index, INT64_MIN,
pts, INT64_MAX, avsflags);
}
}
}
static int demux_lavf_control(demuxer_t *demuxer, int cmd, void *arg)
{
lavf_priv_t *priv = demuxer->priv;
switch (cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (priv->avfc->duration == 0 || priv->avfc->duration == AV_NOPTS_VALUE)
return DEMUXER_CTRL_DONTKNOW;
*((double *)arg) = (double)priv->avfc->duration / AV_TIME_BASE;
return DEMUXER_CTRL_OK;
case DEMUXER_CTRL_SWITCHED_TRACKS:
{
select_tracks(demuxer, 0);
return DEMUXER_CTRL_OK;
}
case DEMUXER_CTRL_IDENTIFY_PROGRAM:
{
demux_program_t *prog = arg;
AVProgram *program;
int p, i;
int start;
add_new_streams(demuxer);
prog->vid = prog->aid = prog->sid = -2;
if (priv->avfc->nb_programs < 1)
return DEMUXER_CTRL_DONTKNOW;
if (prog->progid == -1) {
p = 0;
while (p < priv->avfc->nb_programs && priv->avfc->programs[p]->id != priv->cur_program)
p++;
p = (p + 1) % priv->avfc->nb_programs;
} else {
for (i = 0; i < priv->avfc->nb_programs; i++)
if (priv->avfc->programs[i]->id == prog->progid)
break;
if (i == priv->avfc->nb_programs)
return DEMUXER_CTRL_DONTKNOW;
p = i;
}
start = p;
redo:
prog->vid = prog->aid = prog->sid = -2;
program = priv->avfc->programs[p];
for (i = 0; i < program->nb_stream_indexes; i++) {
struct sh_stream *stream = priv->streams[program->stream_index[i]];
if (stream) {
switch (stream->type) {
case STREAM_VIDEO:
if (prog->vid == -2)
prog->vid = stream->demuxer_id;
break;
case STREAM_AUDIO:
if (prog->aid == -2)
prog->aid = stream->demuxer_id;
break;
case STREAM_SUB:
if (prog->sid == -2)
prog->sid = stream->demuxer_id;
break;
}
}
}
if (prog->progid == -1 && prog->vid == -2 && prog->aid == -2) {
p = (p + 1) % priv->avfc->nb_programs;
if (p == start)
return DEMUXER_CTRL_DONTKNOW;
goto redo;
}
priv->cur_program = prog->progid = program->id;
return DEMUXER_CTRL_OK;
}
case DEMUXER_CTRL_RESYNC:
/* NOTE:
*
* We actually want to call ff_read_frame_flush() here, but it is
* internal.
*
* This function call seems to do the same for now.
*
* Once ff_read_frame_flush() is exported in some way, change this to
* call the new API instead of relying on av_seek_frame() to do this
* for us.
*/
av_seek_frame(priv->avfc, 0, stream_tell(demuxer->stream),
AVSEEK_FLAG_BYTE);
// avio_flush() is designed for write-only streams, and does the wrong
// thing when reading. Flush it manually instead.
priv->avfc->pb->buf_ptr = priv->avfc->pb->buf_end;
stream_drop_buffers(demuxer->stream);
return DEMUXER_CTRL_OK;
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
static void demux_close_lavf(demuxer_t *demuxer)
{
lavf_priv_t *priv = demuxer->priv;
if (priv) {
if (priv->avfc) {
av_freep(&priv->avfc->key);
avformat_close_input(&priv->avfc);
}
if (priv->pb)
av_freep(&priv->pb->buffer);
av_freep(&priv->pb);
talloc_free(priv);
demuxer->priv = NULL;
}
}
const demuxer_desc_t demuxer_desc_lavf = {
.name = "lavf",
.desc = "libavformat",
.fill_buffer = demux_lavf_fill_buffer,
.open = demux_open_lavf,
.close = demux_close_lavf,
.seek = demux_seek_lavf,
.control = demux_lavf_control,
};
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