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5586b02931
mpv/demux/demux_lavf.c
wm4 4e7ab517c1 demux_lavf: set keyframe flag on attached pictures 
Gives really funky results with PNG attachments otherwise. The main
problem is that avcodec_flush_buffers() does not fully reset the
decoder, so passing multiple PNG packets without keyframe flags will
attempt to combine the new picture with the previously decoded
contents. (Makes no sense with proper PNG - maybe this codepath is
intended for MNG or APNG.)
2013-07-24 19:42:02 +02:00

989 lines
32 KiB
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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 <libavformat/avformat.h>
#include <libavformat/avio.h>
#include <libavutil/avutil.h>
#include <libavutil/avstring.h>
#include <libavutil/mathematics.h>
#include <libavutil/opt.h>
#include "compat/libav.h"
#include "config.h"
#include "core/options.h"
#include "core/mp_msg.h"
#include "core/av_opts.h"
#include "core/av_common.h"
#include "core/bstr.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "core/m_option.h"
#define INITIAL_PROBE_SIZE STREAM_BUFFER_SIZE
#define PROBE_BUF_SIZE FFMIN(STREAM_MAX_BUFFER_SIZE, 2 * 1024 * 1024)
#define OPT_BASE_STRUCT struct MPOpts
const m_option_t lavfdopts_conf[] = {
OPT_INTRANGE("probesize", lavfdopts.probesize, 0, 32, INT_MAX),
OPT_STRING("format", lavfdopts.format, 0),
OPT_FLOATRANGE("analyzeduration", lavfdopts.analyzeduration, 0, 0, 3600),
OPT_FLAG("allow-mimetype", lavfdopts.allow_mimetype, 0),
OPT_INTRANGE("probescore", lavfdopts.probescore, 0, 0, 100),
OPT_STRING("cryptokey", lavfdopts.cryptokey, 0),
OPT_CHOICE("genpts-mode", lavfdopts.genptsmode, 0,
({"auto", 0}, {"lavf", 1}, {"builtin", 2}, {"no", 3})),
OPT_STRING("o", lavfdopts.avopt, 0),
{NULL, NULL, 0, 0, 0, 0, NULL}
};
// 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 MAX_PKT_QUEUE 50
typedef struct lavf_priv {
char *filename;
const struct format_hack *format_hack;
AVInputFormat *avif;
AVFormatContext *avfc;
AVIOContext *pb;
uint8_t buffer[BIO_BUFFER_SIZE];
int64_t last_pts;
struct sh_stream **streams; // NULL for unknown streams
int num_streams;
int cur_program;
bool use_dts;
bool seek_by_bytes;
int bitrate;
char *mime_type;
bool genpts_hack;
AVPacket *packets[MAX_PKT_QUEUE];
int num_packets;
} lavf_priv_t;
struct format_hack {
const char *ff_name;
const char *mime_type;
int probescore;
float analyzeduration;
};
static const struct format_hack format_hacks[] = {
{"aac", "audio/aacp", 25, 0.5},
{"aac", "audio/aac", 25, 0.5},
{"mp3", "audio/mpeg", 25, 0.5},
{0}
};
static const struct format_hack *find_format_from_mime_type(char *mime_type)
{
for (int n = 0; format_hacks[n].ff_name; n++) {
if (strcasecmp(format_hacks[n].mime_type, mime_type) == 0)
return &format_hacks[n];
}
return NULL;
}
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_msg(MSGT_HEADER, MSGL_DBG2,
"%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_msg(MSGT_HEADER, MSGL_DBG2, "mp_seek(%p, %"PRId64", %d)\n",
stream, pos, whence);
if (whence == SEEK_CUR)
pos += stream_tell(stream);
else if (whence == SEEK_END && stream->end_pos > 0)
pos += stream->end_pos;
else if (whence == SEEK_SET)
pos += stream->start_pos;
else if (whence == AVSEEK_SIZE && stream->end_pos > 0) {
stream_update_size(stream);
return stream->end_pos - stream->start_pos;
} else
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 - stream->start_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);
if (ret < 0)
ret = AVERROR(ENOSYS);
return ret;
}
static void list_formats(void)
{
mp_msg(MSGT_DEMUX, MSGL_INFO, "Available lavf input formats:\n");
AVInputFormat *fmt = NULL;
while ((fmt = av_iformat_next(fmt)))
mp_msg(MSGT_DEMUX, MSGL_INFO, "%15s : %s\n", fmt->name, fmt->long_name);
}
static char *remove_prefix(char *s, const char **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 *prefixes[] =
{"ffmpeg://", "lavf://", "avdevice://", "av://", NULL};
static int lavf_check_file(demuxer_t *demuxer, enum demux_check check)
{
struct MPOpts *opts = demuxer->opts;
struct lavfdopts *lavfdopts = &opts->lavfdopts;
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_msg(MSGT_DEMUX, MSGL_WARN, "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_msg(MSGT_DEMUX, MSGL_FATAL,
"Must specify filename in 'format:filename' form\n");
return -1;
}
avdevice_format = talloc_strndup(priv, priv->filename,
sep - priv->filename);
priv->filename = sep + 1;
}
const char *expected_format = NULL;
int expected_format_probescore = AVPROBE_SCORE_MAX;
char *mime_type = demuxer->stream->mime_type;
if (lavfdopts->allow_mimetype && mime_type) {
priv->format_hack = find_format_from_mime_type(mime_type);
if (priv->format_hack) {
expected_format = priv->format_hack->ff_name;
expected_format_probescore = priv->format_hack->probescore;
}
}
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();
return -1;
}
priv->avif = av_find_input_format(format);
if (!priv->avif) {
mp_msg(MSGT_DEMUX, MSGL_FATAL, "Unknown lavf format %s\n", format);
return -1;
}
mp_msg(MSGT_DEMUX, MSGL_INFO, "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 : NULL,
.buf_size = 0,
.buf = av_mallocz(PROBE_BUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE),
};
while (avpd.buf_size < PROBE_BUF_SIZE) {
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)
break;
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_msg(MSGT_HEADER, MSGL_V, "Found '%s' at score=%d size=%d.\n",
priv->avif->name, score, avpd.buf_size);
if (score >= min_probe)
break;
if (expected_format) {
if (strcmp(priv->avif->name, expected_format) == 0 &&
score >= expected_format_probescore)
break;
}
}
priv->avif = NULL;
}
av_free(avpd.buf);
if (!priv->avif) {
mp_msg(MSGT_HEADER, MSGL_V,
"No format found, try lowering probescore.\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 && demuxer_stream_is_selected(demuxer, stream) &&
!stream->attached_picture;
st->discard = selected ? AVDISCARD_DEFAULT : AVDISCARD_ALL;
}
}
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_audio->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->i_bps = codec->bit_rate / 8;
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_video->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->i_bps = codec->bit_rate / 8;
mp_msg(MSGT_DEMUX, MSGL_DBG2, "aspect= %d*%d/(%d*%d)\n",
codec->width, codec->sample_aspect_ratio.num,
codec->height, codec->sample_aspect_ratio.den);
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 = malloc(codec->extradata_size);
memcpy(sh_sub->extradata, codec->extradata, codec->extradata_size);
sh_sub->extradata_len = codec->extradata_size;
}
break;
}
case AVMEDIA_TYPE_ATTACHMENT: {
AVDictionaryEntry *ftag = av_dict_get(st->metadata, "filename",
NULL, 0);
char *filename = ftag ? ftag->value : NULL;
if (st->codec->codec_id == AV_CODEC_ID_TTF)
demuxer_add_attachment(demuxer, bstr0(filename),
bstr0("application/x-truetype-font"),
(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 add_metadata(demuxer_t *demuxer, AVDictionary *metadata)
{
AVDictionaryEntry *t = NULL;
while ((t = av_dict_get(metadata, "", t, AV_DICT_IGNORE_SUFFIX)))
demux_info_add(demuxer, t->key, t->value);
}
static int demux_open_lavf(demuxer_t *demuxer, enum demux_check check)
{
struct MPOpts *opts = demuxer->opts;
struct lavfdopts *lavfdopts = &opts->lavfdopts;
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;
stream_seek(demuxer->stream, 0);
avfc = avformat_alloc_context();
if (lavfdopts->cryptokey)
parse_cryptokey(avfc, lavfdopts->cryptokey);
if (matches_avinputformat_name(priv, "avi")) {
/* for avi libavformat returns the avi timestamps in .dts,
* some made-up stuff that's not really pts in .pts */
priv->use_dts = true;
demuxer->timestamp_type = TIMESTAMP_TYPE_SORT;
} else {
int mode = lavfdopts->genptsmode;
if (mode == 0 && opts->user_correct_pts != 0)
mode = demuxer->stream->uncached_type == STREAMTYPE_DVD ? 2 : 1;
if (mode == 1)
avfc->flags |= AVFMT_FLAG_GENPTS;
if (mode == 2)
priv->genpts_hack = true;
}
if (opts->index_mode == 0)
avfc->flags |= AVFMT_FLAG_IGNIDX;
if (lavfdopts->probesize) {
if (av_opt_set_int(avfc, "probesize", lavfdopts->probesize, 0) < 0)
mp_msg(MSGT_HEADER, MSGL_ERR,
"demux_lavf, 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_msg(MSGT_HEADER, MSGL_ERR, "demux_lavf, couldn't set option "
"analyzeduration to %f\n", analyze_duration);
}
if (lavfdopts->avopt) {
if (parse_avopts(avfc, lavfdopts->avopt) < 0) {
mp_msg(MSGT_HEADER, MSGL_ERR,
"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)
{
priv->pb = avio_alloc_context(priv->buffer, BIO_BUFFER_SIZE, 0,
demuxer, mp_read, NULL, mp_seek);
priv->pb->read_seek = mp_read_seek;
priv->pb->seekable = demuxer->stream->end_pos
&& (demuxer->stream->flags & MP_STREAM_SEEK) == MP_STREAM_SEEK
? AVIO_SEEKABLE_NORMAL : 0;
avfc->pb = priv->pb;
}
if (avformat_open_input(&avfc, priv->filename, priv->avif, NULL) < 0) {
mp_msg(MSGT_HEADER, MSGL_ERR,
"LAVF_header: avformat_open_input() failed\n");
return -1;
}
priv->avfc = avfc;
if (avformat_find_stream_info(avfc, NULL) < 0) {
mp_msg(MSGT_HEADER, MSGL_ERR,
"LAVF_header: av_find_stream_info() failed\n");
return -1;
}
mp_msg(MSGT_HEADER, MSGL_V, "demux_lavf: 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);
demuxer_add_chapter(demuxer, t ? bstr0(t->value) : bstr0(NULL),
start, end);
}
add_new_streams(demuxer);
add_metadata(demuxer, 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])
add_metadata(demuxer, avfc->streams[n]->metadata);
}
}
if (avfc->nb_programs) {
int p;
for (p = 0; p < avfc->nb_programs; p++) {
AVProgram *program = avfc->programs[p];
t = av_dict_get(program->metadata, "title", NULL, 0);
mp_msg(MSGT_HEADER, MSGL_INFO, "LAVF: Program %d %s\n",
program->id, t ? t->value : "");
mp_msg(MSGT_IDENTIFY, MSGL_V, "PROGRAM_ID=%d\n", program->id);
}
}
mp_msg(MSGT_HEADER, MSGL_V, "LAVF: build %d\n", LIBAVFORMAT_BUILD);
demuxer->ts_resets_possible = priv->avif->flags & AVFMT_TS_DISCONT;
// disabled because unreliable per-stream bitrate values returned
// by libavformat trigger this heuristic incorrectly and break things
#if 0
/* libavformat sets bitrate for mpeg based on pts at start and end
* of file, which fails for files with pts resets. So calculate our
* own bitrate estimate. */
if (priv->avif->flags & AVFMT_TS_DISCONT) {
for (int i = 0; i < avfc->nb_streams; i++)
priv->bitrate += avfc->streams[i]->codec->bit_rate;
/* pts-based is more accurate if there are no resets; try to make
* a somewhat reasonable guess */
if (!avfc->duration || avfc->duration == AV_NOPTS_VALUE
|| priv->bitrate && (avfc->bit_rate < priv->bitrate / 2
|| avfc->bit_rate > priv->bitrate * 2))
priv->seek_by_bytes = true;
if (!priv->bitrate)
priv->bitrate = 1440000;
}
#endif
demuxer->accurate_seek = !priv->seek_by_bytes;
return 0;
}
static void seek_reset(demuxer_t *demux)
{
lavf_priv_t *priv = demux->priv;
for (int n = 0; n < priv->num_packets; n++)
talloc_free(priv->packets[n]);
priv->num_packets = 0;
}
static int destroy_avpacket(void *pkt)
{
av_free_packet(pkt);
return 0;
}
static int read_more_av_packets(demuxer_t *demux)
{
lavf_priv_t *priv = demux->priv;
if (priv->num_packets >= MAX_PKT_QUEUE)
return -1;
demux->filepos = stream_tell(demux->stream);
AVPacket *pkt = talloc(NULL, AVPacket);
if (av_read_frame(priv->avfc, pkt) < 0) {
talloc_free(pkt);
return -2; // eof
}
talloc_set_destructor(pkt, destroy_avpacket);
add_new_streams(demux);
assert(pkt->stream_index >= 0 && pkt->stream_index < priv->num_streams);
struct sh_stream *stream = priv->streams[pkt->stream_index];
if (!demuxer_stream_is_selected(demux, stream)) {
talloc_free(pkt);
return 0; // skip
}
// 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();
priv->packets[priv->num_packets++] = pkt;
talloc_steal(priv, pkt);
return 1;
}
static int read_av_packet(demuxer_t *demux, AVPacket **pkt)
{
lavf_priv_t *priv = demux->priv;
if (priv->num_packets < 1) {
int r = read_more_av_packets(demux);
if (r <= 0)
return r;
}
AVPacket *next = priv->packets[0];
if (priv->genpts_hack && next->dts != AV_NOPTS_VALUE) {
int n = 1;
while (next->pts == AV_NOPTS_VALUE) {
while (n >= priv->num_packets) {
if (read_more_av_packets(demux) < 0)
goto end; // queue limit or EOF reached - just use as is
}
AVPacket *cur = priv->packets[n];
if (cur->stream_index == next->stream_index) {
if (next->dts < cur->dts && cur->pts != cur->dts)
next->pts = cur->dts;
}
n++;
}
}
end:
MP_TARRAY_REMOVE_AT(priv->packets, priv->num_packets, 0);
*pkt = next;
return 1;
}
static int demux_lavf_fill_buffer(demuxer_t *demux)
{
lavf_priv_t *priv = demux->priv;
demux_packet_t *dp;
mp_msg(MSGT_DEMUX, MSGL_DBG2, "demux_lavf_fill_buffer()\n");
AVPacket *pkt;
int r = read_av_packet(demux, &pkt);
if (r <= 0)
return r == 0; // don't signal EOF if skipping a packet
AVStream *st = priv->avfc->streams[pkt->stream_index];
struct sh_stream *stream = priv->streams[pkt->stream_index];
dp = new_demux_packet_fromdata(pkt->data, pkt->size);
dp->avpacket = talloc_steal(dp, pkt);
int64_t ts = priv->use_dts ? pkt->dts : pkt->pts;
if (ts != AV_NOPTS_VALUE) {
dp->pts = ts * av_q2d(st->time_base);
priv->last_pts = dp->pts * AV_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 = demux->filepos;
dp->keyframe = pkt->flags & AV_PKT_FLAG_KEY;
// Use only one stream for stream_pts, otherwise PTS might be jumpy.
if (stream->type == STREAM_VIDEO) {
double pts;
if (stream_control(demux->stream, STREAM_CTRL_GET_CURRENT_TIME, &pts) > 0)
dp->stream_pts = pts;
}
demuxer_add_packet(demux, stream, dp);
return 1;
}
static void demux_seek_lavf(demuxer_t *demuxer, float rel_seek_secs,
float audio_delay, int flags)
{
lavf_priv_t *priv = demuxer->priv;
int avsflags = 0;
mp_msg(MSGT_DEMUX, MSGL_DBG2, "demux_seek_lavf(%p, %f, %f, %d)\n",
demuxer, rel_seek_secs, audio_delay, flags);
seek_reset(demuxer);
if (priv->seek_by_bytes) {
int64_t pos = demuxer->filepos;
rel_seek_secs *= priv->bitrate / 8;
pos += rel_seek_secs;
av_seek_frame(priv->avfc, -1, pos, AVSEEK_FLAG_BYTE);
return;
}
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) {
if (demuxer->movi_end > 0 && demuxer->ts_resets_possible &&
!(priv->avif->flags & AVFMT_NO_BYTE_SEEK))
{
avsflags |= AVSEEK_FLAG_BYTE;
priv->last_pts = (demuxer->movi_end - demuxer->movi_start) *
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.
int r = avformat_seek_file(priv->avfc, -1, INT64_MIN,
priv->last_pts, priv->last_pts, avsflags);
// Similar issue as in the normal seeking codepath.
if (r < 0) {
avformat_seek_file(priv->avfc, -1, INT64_MIN,
priv->last_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->seek_by_bytes) {
/* Our bitrate estimate may be better than would be used in
* otherwise similar fallback code at higher level */
if (demuxer->movi_end <= 0)
return DEMUXER_CTRL_DONTKNOW;
*(double *)arg = (demuxer->movi_end - demuxer->movi_start) * 8 /
priv->bitrate;
return DEMUXER_CTRL_GUESS;
}
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_GET_START_TIME:
*((double *)arg) = priv->avfc->start_time == AV_NOPTS_VALUE ?
0 : (double)priv->avfc->start_time / 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.
*/
avio_flush(priv->avfc->pb);
av_seek_frame(priv->avfc, 0, stream_tell(demuxer->stream),
AVSEEK_FLAG_BYTE);
seek_reset(demuxer);
avio_flush(priv->avfc->pb);
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);
}
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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