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mpv/demux/demux.c

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/*
* DEMUXER v2.5
*
* 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 <string.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "config.h"
#include "core/options.h"
#include "talloc.h"
#include "core/mp_msg.h"
#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "mf.h"
#include "audio/format.h"
#include "libavcodec/avcodec.h"
#if MP_INPUT_BUFFER_PADDING_SIZE < FF_INPUT_BUFFER_PADDING_SIZE
#error MP_INPUT_BUFFER_PADDING_SIZE is too small!
#endif
static void clear_parser(sh_common_t *sh);
// Demuxer list
extern const struct demuxer_desc demuxer_desc_edl;
extern const struct demuxer_desc demuxer_desc_cue;
extern const demuxer_desc_t demuxer_desc_rawaudio;
extern const demuxer_desc_t demuxer_desc_rawvideo;
extern const demuxer_desc_t demuxer_desc_tv;
extern const demuxer_desc_t demuxer_desc_mf;
extern const demuxer_desc_t demuxer_desc_avi;
extern const demuxer_desc_t demuxer_desc_asf;
extern const demuxer_desc_t demuxer_desc_matroska;
extern const demuxer_desc_t demuxer_desc_lavf;
extern const demuxer_desc_t demuxer_desc_mng;
extern const demuxer_desc_t demuxer_desc_mpeg_ps;
extern const demuxer_desc_t demuxer_desc_mpeg_pes;
extern const demuxer_desc_t demuxer_desc_mpeg_gxf;
extern const demuxer_desc_t demuxer_desc_mpeg_es;
extern const demuxer_desc_t demuxer_desc_mpeg4_es;
extern const demuxer_desc_t demuxer_desc_h264_es;
extern const demuxer_desc_t demuxer_desc_mpeg_ts;
/* Please do not add any new demuxers here. If you want to implement a new
* demuxer, add it to libavformat, except for wrappers around external
* libraries and demuxers requiring binary support. */
const demuxer_desc_t *const demuxer_list[] = {
&demuxer_desc_edl,
&demuxer_desc_cue,
&demuxer_desc_rawaudio,
&demuxer_desc_rawvideo,
#ifdef CONFIG_TV
&demuxer_desc_tv,
#endif
&demuxer_desc_matroska,
&demuxer_desc_lavf,
&demuxer_desc_avi,
&demuxer_desc_asf,
#ifdef CONFIG_MNG
&demuxer_desc_mng,
#endif
&demuxer_desc_mpeg_ps,
&demuxer_desc_mpeg_pes,
&demuxer_desc_mpeg_gxf,
&demuxer_desc_mpeg_es,
&demuxer_desc_mpeg4_es,
&demuxer_desc_h264_es,
&demuxer_desc_mpeg_ts,
// auto-probe last, because it checks file-extensions only
&demuxer_desc_mf,
/* Please do not add any new demuxers here. If you want to implement a new
* demuxer, add it to libavformat, except for wrappers around external
* libraries and demuxers requiring binary support. */
NULL
};
static struct demux_packet *create_packet(size_t len)
{
if (len > 1000000000) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Attempt to allocate demux packet "
"over 1 GB!\n");
abort();
}
struct demux_packet *dp = malloc(sizeof(struct demux_packet));
dp->len = len;
dp->next = NULL;
dp->pts = MP_NOPTS_VALUE;
dp->duration = -1;
dp->stream_pts = MP_NOPTS_VALUE;
dp->pos = 0;
dp->keyframe = false;
dp->refcount = 1;
dp->master = NULL;
dp->buffer = NULL;
dp->avpacket = NULL;
return dp;
}
struct demux_packet *new_demux_packet(size_t len)
{
struct demux_packet *dp = create_packet(len);
dp->buffer = malloc(len + MP_INPUT_BUFFER_PADDING_SIZE);
if (!dp->buffer) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Memory allocation failure!\n");
abort();
}
memset(dp->buffer + len, 0, 8);
return dp;
}
// data must already have suitable padding
struct demux_packet *new_demux_packet_fromdata(void *data, size_t len)
{
struct demux_packet *dp = create_packet(len);
dp->buffer = data;
return dp;
}
void resize_demux_packet(struct demux_packet *dp, size_t len)
{
if (len > 1000000000) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Attempt to realloc demux packet "
"over 1 GB!\n");
abort();
}
dp->buffer = realloc(dp->buffer, len + MP_INPUT_BUFFER_PADDING_SIZE);
if (!dp->buffer) {
mp_msg(MSGT_DEMUXER, MSGL_FATAL, "Memory allocation failure!\n");
abort();
}
memset(dp->buffer + len, 0, 8);
dp->len = len;
}
struct demux_packet *clone_demux_packet(struct demux_packet *pack)
{
struct demux_packet *dp = malloc(sizeof(struct demux_packet));
while (pack->master)
pack = pack->master; // find the master
memcpy(dp, pack, sizeof(struct demux_packet));
dp->next = NULL;
dp->refcount = 0;
dp->master = pack;
pack->refcount++;
return dp;
}
void free_demux_packet(struct demux_packet *dp)
{
if (dp->master == NULL) { //dp is a master packet
dp->refcount--;
if (dp->refcount == 0) {
if (dp->avpacket)
talloc_free(dp->avpacket);
else
free(dp->buffer);
free(dp);
}
return;
}
// dp is a clone:
free_demux_packet(dp->master);
free(dp);
}
static void free_demuxer_stream(struct demux_stream *ds)
{
ds_free_packs(ds);
free(ds);
}
static struct demux_stream *new_demuxer_stream(struct demuxer *demuxer,
enum stream_type type, int id)
{
demux_stream_t *ds = malloc(sizeof(demux_stream_t));
*ds = (demux_stream_t) {
.stream_type = type,
.id = id,
.demuxer = demuxer,
.asf_seq = -1,
};
return ds;
}
struct sh_stream *ds_gsh(struct demux_stream *ds)
{
// Ideally ds would have a gsh field, but since all the old demuxers set
// ds->sh themselves and we don't want to change them, enjoy this hack.
if (!ds->sh)
return NULL;
switch (ds->stream_type) {
case STREAM_VIDEO: return ((struct sh_video *)ds->sh)->gsh;
case STREAM_AUDIO: return ((struct sh_audio *)ds->sh)->gsh;
case STREAM_SUB: return ((struct sh_sub *)ds->sh)->gsh;
}
assert(false);
}
/**
* Get demuxer description structure for a given demuxer type
*
* @param file_format type of the demuxer
* @return structure for the demuxer, NULL if not found
*/
static const demuxer_desc_t *get_demuxer_desc_from_type(int file_format)
{
int i;
for (i = 0; demuxer_list[i]; i++)
if (file_format == demuxer_list[i]->type)
return demuxer_list[i];
return NULL;
}
demuxer_t *new_demuxer(struct MPOpts *opts, stream_t *stream, int type,
int a_id, int v_id, int s_id, char *filename)
{
struct demuxer *d = talloc_zero(NULL, struct demuxer);
d->stream = stream;
d->stream_pts = MP_NOPTS_VALUE;
d->reference_clock = MP_NOPTS_VALUE;
d->movi_start = stream->start_pos;
d->movi_end = stream->end_pos;
d->seekable = 1;
d->synced = 0;
d->filepos = -1;
d->audio = new_demuxer_stream(d, STREAM_VIDEO, a_id);
d->video = new_demuxer_stream(d, STREAM_AUDIO, v_id);
d->sub = new_demuxer_stream(d, STREAM_SUB, s_id);
d->ds[STREAM_VIDEO] = d->video;
d->ds[STREAM_AUDIO] = d->audio;
d->ds[STREAM_SUB] = d->sub;
d->type = type;
d->opts = opts;
if (type)
if (!(d->desc = get_demuxer_desc_from_type(type)))
mp_msg(MSGT_DEMUXER, MSGL_ERR,
"BUG! Invalid demuxer type in new_demuxer(), "
"big troubles ahead.\n");
if (filename) // Filename hack for avs_check_file
d->filename = strdup(filename);
stream_seek(stream, stream->start_pos);
return d;
}
const char *sh_sub_type2str(int type)
{
switch (type) {
case 't': return "text";
case 'm': return "movtext";
case 'a': return "ass";
case 'v': return "vobsub";
case 'x': return "xsub";
case 'b': return "dvb";
case 'd': return "dvb-teletext";
case 'p': return "hdmv pgs";
}
return "unknown";
}
static struct sh_stream *new_sh_stream(demuxer_t *demuxer,
enum stream_type type,
int stream_index,
int tid)
{
struct sh_stream *sh = talloc_struct(demuxer, struct sh_stream, {
.type = type,
.demuxer = demuxer,
.index = demuxer->num_streams,
.demuxer_id = tid, // may be overwritten by demuxer
.tid = tid,
.stream_index = stream_index,
.opts = demuxer->opts,
});
MP_TARRAY_APPEND(demuxer, demuxer->streams, demuxer->num_streams, sh);
switch (sh->type) {
case STREAM_VIDEO: {
struct sh_video *sht = talloc_zero(demuxer, struct sh_video);
sht->vid = sh->tid;
sht->ds = demuxer->video;
sh->video = sht;
sh->common_header = (struct sh_common *) sht;
demuxer->v_streams[sh->stream_index] = sht;
break;
}
case STREAM_AUDIO: {
struct sh_audio *sht = talloc_zero(demuxer, struct sh_audio);
sht->aid = tid;
sht->ds = demuxer->audio;
sht->samplesize = 2;
sht->sample_format = AF_FORMAT_S16_NE;
sh->audio = sht;
sh->common_header = (struct sh_common *) sht;
demuxer->a_streams[sh->stream_index] = sht;
break;
}
case STREAM_SUB: {
struct sh_sub *sht = talloc_zero(demuxer, struct sh_sub);
sht->sid = tid;
sht->ds = demuxer->sub;
sh->sub = sht;
sh->common_header = (struct sh_common *) sht;
demuxer->s_streams[sh->stream_index] = sht;
break;
}
default: assert(false);
}
sh->common_header->opts = sh->opts;
sh->common_header->gsh = sh;
return sh;
}
sh_sub_t *new_sh_sub_sid(demuxer_t *demuxer, int id, int sid)
{
if (id > MAX_S_STREAMS - 1 || id < 0) {
mp_msg(MSGT_DEMUXER, MSGL_WARN,
"Requested sub stream id overflow (%d > %d)\n", id,
MAX_S_STREAMS);
return NULL;
}
if (demuxer->s_streams[id])
mp_msg(MSGT_DEMUXER, MSGL_WARN, "Sub stream %i redefined\n", id);
else {
new_sh_stream(demuxer, STREAM_SUB, id, sid);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_SUBTITLE_ID=%d\n", sid);
}
return demuxer->s_streams[id];
}
struct sh_sub *new_sh_sub_sid_lang(struct demuxer *demuxer, int id, int sid,
const char *lang)
{
struct sh_sub *sh = new_sh_sub_sid(demuxer, id, sid);
if (lang && lang[0] && strcmp(lang, "und")) {
sh->lang = talloc_strdup(sh, lang);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_SID_%d_LANG=%s\n", sid, lang);
}
return sh;
}
static void free_sh_sub(sh_sub_t *sh)
{
mp_msg(MSGT_DEMUXER, MSGL_DBG2, "DEMUXER: freeing sh_sub at %p\n", sh);
free(sh->extradata);
clear_parser((sh_common_t *)sh);
talloc_free(sh);
}
sh_audio_t *new_sh_audio_aid(demuxer_t *demuxer, int id, int aid)
{
if (id > MAX_A_STREAMS - 1 || id < 0) {
mp_msg(MSGT_DEMUXER, MSGL_WARN,
"Requested audio stream id overflow (%d > %d)\n", id,
MAX_A_STREAMS);
return NULL;
}
if (demuxer->a_streams[id]) {
mp_tmsg(MSGT_DEMUXER, MSGL_WARN, "WARNING: Audio stream header %d redefined.\n", id);
} else {
mp_tmsg(MSGT_DEMUXER, MSGL_V, "==> Found audio stream: %d\n", id);
new_sh_stream(demuxer, STREAM_AUDIO, id, aid);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_ID=%d\n", aid);
}
return demuxer->a_streams[id];
}
static void free_sh_audio(demuxer_t *demuxer, int id)
{
sh_audio_t *sh = demuxer->a_streams[id];
demuxer->a_streams[id] = NULL;
mp_msg(MSGT_DEMUXER, MSGL_DBG2, "DEMUXER: freeing sh_audio at %p\n", sh);
free(sh->wf);
free(sh->codecdata);
clear_parser((sh_common_t *)sh);
talloc_free(sh);
}
sh_video_t *new_sh_video_vid(demuxer_t *demuxer, int id, int vid)
{
if (id > MAX_V_STREAMS - 1 || id < 0) {
mp_msg(MSGT_DEMUXER, MSGL_WARN,
"Requested video stream id overflow (%d > %d)\n", id,
MAX_V_STREAMS);
return NULL;
}
if (demuxer->v_streams[id])
mp_tmsg(MSGT_DEMUXER, MSGL_WARN, "WARNING: Video stream header %d redefined.\n", id);
else {
mp_tmsg(MSGT_DEMUXER, MSGL_V, "==> Found video stream: %d\n", id);
new_sh_stream(demuxer, STREAM_VIDEO, id, vid);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_VIDEO_ID=%d\n", vid);
}
return demuxer->v_streams[id];
}
static void free_sh_video(sh_video_t *sh)
{
mp_msg(MSGT_DEMUXER, MSGL_DBG2, "DEMUXER: freeing sh_video at %p\n", sh);
free(sh->bih);
clear_parser((sh_common_t *)sh);
talloc_free(sh);
}
void free_demuxer(demuxer_t *demuxer)
{
int i;
mp_msg(MSGT_DEMUXER, MSGL_DBG2, "DEMUXER: freeing %s demuxer at %p\n",
demuxer->desc->shortdesc, demuxer);
if (demuxer->desc->close)
demuxer->desc->close(demuxer);
// free streams:
for (i = 0; i < MAX_A_STREAMS; i++)
if (demuxer->a_streams[i])
free_sh_audio(demuxer, i);
for (i = 0; i < MAX_V_STREAMS; i++)
if (demuxer->v_streams[i])
free_sh_video(demuxer->v_streams[i]);
for (i = 0; i < MAX_S_STREAMS; i++)
if (demuxer->s_streams[i])
free_sh_sub(demuxer->s_streams[i]);
// free demuxers:
free_demuxer_stream(demuxer->audio);
free_demuxer_stream(demuxer->video);
free_demuxer_stream(demuxer->sub);
free(demuxer->filename);
talloc_free(demuxer);
}
void ds_add_packet(demux_stream_t *ds, demux_packet_t *dp)
{
// demux API can't handle 0-sized packets, but at least some vobsubs
// generate them. Skipping them seems to work fine. Not skipping them will
// stop demuxing with external vobsubs. See FATE sub/vobsub.{idx,sub} at
// pts=185.91.
if (dp->len == 0 && ds->stream_type == STREAM_SUB) {
mp_dbg(MSGT_DEMUXER, MSGL_INFO, "Discarding empty subtitle packet.\n");
free_demux_packet(dp);
return;
}
// append packet to DS stream:
++ds->packs;
ds->bytes += dp->len;
if (ds->last) {
// next packet in stream
ds->last->next = dp;
ds->last = dp;
} else {
// first packet in stream
ds->first = ds->last = dp;
}
mp_dbg(MSGT_DEMUXER, MSGL_DBG2,
"DEMUX: Append packet to %s, len=%d pts=%5.3f pos=%u [packs: A=%d V=%d]\n",
(ds == ds->demuxer->audio) ? "d_audio" : "d_video", dp->len,
dp->pts, (unsigned int) dp->pos, ds->demuxer->audio->packs,
ds->demuxer->video->packs);
}
static void allocate_parser(AVCodecContext **avctx, AVCodecParserContext **parser, unsigned format)
{
enum CodecID codec_id = CODEC_ID_NONE;
switch (format) {
case MKTAG('M', 'P', '4', 'L'):
codec_id = CODEC_ID_AAC_LATM;
break;
case 0x2000:
case 0x332D6361:
case 0x332D4341:
case 0x20736D:
case MKTAG('s', 'a', 'c', '3'):
codec_id = CODEC_ID_AC3;
break;
case MKTAG('d', 'n', 'e', 't'):
// DNET/byte-swapped AC-3 - there is no parser for that yet
//codec_id = CODEC_ID_DNET;
break;
case MKTAG('E', 'A', 'C', '3'):
codec_id = CODEC_ID_EAC3;
break;
case 0x2001:
case 0x86:
codec_id = CODEC_ID_DTS;
break;
case MKTAG('f', 'L', 'a', 'C'):
codec_id = CODEC_ID_FLAC;
break;
case MKTAG('M', 'L', 'P', ' '):
codec_id = CODEC_ID_MLP;
break;
case 0x55:
case 0x5500736d:
case 0x55005354:
case MKTAG('.', 'm', 'p', '3'):
case MKTAG('M', 'P', '3', ' '):
case MKTAG('L', 'A', 'M', 'E'):
codec_id = CODEC_ID_MP3;
break;
case 0x50:
case 0x5000736d:
case MKTAG('.', 'm', 'p', '2'):
case MKTAG('.', 'm', 'p', '1'):
codec_id = CODEC_ID_MP2;
break;
case MKTAG('T', 'R', 'H', 'D'):
codec_id = CODEC_ID_TRUEHD;
break;
}
if (codec_id != CODEC_ID_NONE) {
*avctx = avcodec_alloc_context3(NULL);
if (!*avctx)
return;
*parser = av_parser_init(codec_id);
if (!*parser)
av_freep(avctx);
}
}
static void get_parser(sh_common_t *sh, AVCodecContext **avctx, AVCodecParserContext **parser)
{
*avctx = NULL;
*parser = NULL;
if (!sh || !sh->needs_parsing)
return;
*avctx = sh->avctx;
*parser = sh->parser;
if (*parser)
return;
allocate_parser(avctx, parser, sh->format);
sh->avctx = *avctx;
sh->parser = *parser;
}
int ds_parse(demux_stream_t *ds, uint8_t **buffer, int *len, double pts, int64_t pos)
{
AVCodecContext *avctx;
AVCodecParserContext *parser;
get_parser(ds->sh, &avctx, &parser);
if (!parser)
return *len;
return av_parser_parse2(parser, avctx, buffer, len, *buffer, *len, pts, pts, pos);
}
static void clear_parser(sh_common_t *sh)
{
av_parser_close(sh->parser);
sh->parser = NULL;
av_freep(&sh->avctx);
}
void ds_clear_parser(demux_stream_t *ds)
{
if (!ds->sh)
return;
clear_parser(ds->sh);
}
void ds_read_packet(demux_stream_t *ds, stream_t *stream, int len,
double pts, int64_t pos, bool keyframe)
{
demux_packet_t *dp = new_demux_packet(len);
len = stream_read(stream, dp->buffer, len);
resize_demux_packet(dp, len);
dp->pts = pts;
dp->pos = pos;
dp->keyframe = keyframe;
// append packet to DS stream:
ds_add_packet(ds, dp);
}
// return value:
// 0 = EOF or no stream found or invalid type
// 1 = successfully read a packet
int demux_fill_buffer(demuxer_t *demux, demux_stream_t *ds)
{
// Note: parameter 'ds' can be NULL!
return demux->desc->fill_buffer(demux, ds);
}
// return value:
// 0 = EOF
// 1 = successful
int ds_fill_buffer(demux_stream_t *ds)
{
demuxer_t *demux = ds->demuxer;
if (ds->current)
free_demux_packet(ds->current);
ds->current = NULL;
mp_dbg(MSGT_DEMUXER, MSGL_DBG3, "ds_fill_buffer (%s) called\n",
ds == demux->audio ? "d_audio" : ds == demux->video ? "d_video" :
ds == demux->sub ? "d_sub" : "unknown");
while (1) {
int apacks = demux->audio ? demux->audio->packs : 0;
int abytes = demux->audio ? demux->audio->bytes : 0;
int vpacks = demux->video ? demux->video->packs : 0;
int vbytes = demux->video ? demux->video->bytes : 0;
if (ds->packs) {
demux_packet_t *p = ds->first;
// obviously not yet EOF after all
ds->eof = 0;
ds->fill_count = 0;
// copy useful data:
ds->buffer = p->buffer;
ds->buffer_pos = 0;
ds->buffer_size = p->len;
ds->pos = p->pos;
ds->dpos += p->len; // !!!
++ds->pack_no;
if (p->pts != MP_NOPTS_VALUE) {
ds->pts = p->pts;
ds->pts_bytes = 0;
}
ds->pts_bytes += p->len; // !!!
if (p->stream_pts != MP_NOPTS_VALUE)
demux->stream_pts = p->stream_pts;
ds->keyframe = p->keyframe;
// unlink packet:
ds->bytes -= p->len;
ds->current = p;
ds->first = p->next;
if (!ds->first)
ds->last = NULL;
--ds->packs;
/* The code below can set ds->eof to 1 when another stream runs
* out of buffer space. That makes sense because in that situation
* the calling code should not count on being able to demux more
* packets from this stream.
* If however the situation improves and we're called again
* despite the eof flag then it's better to clear it to avoid
* weird behavior. */
ds->eof = 0;
return 1;
}
// avoid buffering too far ahead in e.g. badly interleaved files
// or when one stream is shorter, without breaking large audio
// delay with well interleaved files.
// This needs to be enough for at least 1 second of packets
// since libavformat mov demuxer does not try to interleave
// with more than 1s precision.
if (ds->fill_count > 80)
break;
// avoid printing the "too many ..." message over and over
if (ds->eof)
break;
#define MaybeNI _("Maybe you are playing a non-interleaved stream/file or the codec failed?\n" \
"For AVI files, try to force non-interleaved mode with the --demuxer=avi --avi-ni options.\n")
if (apacks >= MAX_PACKS || abytes >= MAX_PACK_BYTES) {
mp_tmsg(MSGT_DEMUXER, MSGL_ERR, "\nToo many audio packets in the buffer: (%d in %d bytes).\n",
apacks, abytes);
mp_tmsg(MSGT_DEMUXER, MSGL_HINT, MaybeNI);
break;
}
if (vpacks >= MAX_PACKS || vbytes >= MAX_PACK_BYTES) {
mp_tmsg(MSGT_DEMUXER, MSGL_ERR, "\nToo many video packets in the buffer: (%d in %d bytes).\n",
vpacks, vbytes);
mp_tmsg(MSGT_DEMUXER, MSGL_HINT, MaybeNI);
break;
}
if (!demux_fill_buffer(demux, ds)) {
mp_dbg(MSGT_DEMUXER, MSGL_DBG2,
"ds_fill_buffer()->demux_fill_buffer() failed\n");
break; // EOF
}
if (demux->audio)
ds->fill_count += demux->audio->packs - apacks;
if (demux->video && demux->video->packs > vpacks &&
// Empty packets or "skip" packets in e.g. AVI can cause issues.
demux->video->bytes > vbytes + 100 &&
// when video needs parsing we will have lots of video packets
// in-between audio packets, so ignore them in that case.
demux->video->sh && !((sh_video_t *)demux->video->sh)->needs_parsing)
ds->fill_count++;
}
ds->buffer_pos = ds->buffer_size = 0;
ds->buffer = NULL;
mp_msg(MSGT_DEMUXER, MSGL_V,
"ds_fill_buffer: EOF reached (stream: %s) \n",
ds == demux->audio ? "audio" : "video");
ds->eof = 1;
return 0;
}
int demux_read_data(demux_stream_t *ds, unsigned char *mem, int len)
{
int x;
int bytes = 0;
while (len > 0) {
x = ds->buffer_size - ds->buffer_pos;
if (x == 0) {
if (!ds_fill_buffer(ds))
return bytes;
} else {
if (x > len)
x = len;
if (mem)
memcpy(mem + bytes, &ds->buffer[ds->buffer_pos], x);
bytes += x;
len -= x;
ds->buffer_pos += x;
}
}
return bytes;
}
/**
* \brief read data until the given 3-byte pattern is encountered, up to maxlen
* \param mem memory to read data into, may be NULL to discard data
* \param maxlen maximum number of bytes to read
* \param read number of bytes actually read
* \param pattern pattern to search for (lowest 8 bits are ignored)
* \return whether pattern was found
*/
int demux_pattern_3(demux_stream_t *ds, unsigned char *mem, int maxlen,
int *read, uint32_t pattern)
{
register uint32_t head = 0xffffff00;
register uint32_t pat = pattern & 0xffffff00;
int total_len = 0;
do {
register unsigned char *ds_buf = &ds->buffer[ds->buffer_size];
int len = ds->buffer_size - ds->buffer_pos;
register long pos = -len;
if (unlikely(pos >= 0)) { // buffer is empty
ds_fill_buffer(ds);
continue;
}
do {
head |= ds_buf[pos];
head <<= 8;
} while (++pos && head != pat);
len += pos;
if (total_len + len > maxlen)
len = maxlen - total_len;
len = demux_read_data(ds, mem ? &mem[total_len] : NULL, len);
total_len += len;
} while ((head != pat || total_len < 3) && total_len < maxlen && !ds->eof);
if (read)
*read = total_len;
return total_len >= 3 && head == pat;
}
void ds_free_packs(demux_stream_t *ds)
{
demux_packet_t *dp = ds->first;
while (dp) {
demux_packet_t *dn = dp->next;
free_demux_packet(dp);
dp = dn;
}
if (ds->asf_packet) {
// free unfinished .asf fragments:
free(ds->asf_packet->buffer);
free(ds->asf_packet);
ds->asf_packet = NULL;
}
ds->first = ds->last = NULL;
ds->packs = 0; // !!!!!
ds->bytes = 0;
if (ds->current)
free_demux_packet(ds->current);
ds->current = NULL;
ds->buffer = NULL;
ds->buffer_pos = ds->buffer_size;
ds->pts = MP_NOPTS_VALUE;
ds->pts_bytes = 0;
}
int ds_get_packet(demux_stream_t *ds, unsigned char **start)
{
int len;
if (ds->buffer_pos >= ds->buffer_size) {
if (!ds_fill_buffer(ds)) {
// EOF
*start = NULL;
return -1;
}
}
len = ds->buffer_size - ds->buffer_pos;
*start = &ds->buffer[ds->buffer_pos];
ds->buffer_pos += len;
return len;
}
int ds_get_packet_pts(demux_stream_t *ds, unsigned char **start, double *pts)
{
int len;
*pts = MP_NOPTS_VALUE;
len = ds_get_packet(ds, start);
if (len < 0)
return len;
// Return pts unless this read starts from the middle of a packet
if (len == ds->buffer_pos)
*pts = ds->current->pts;
return len;
}
int ds_get_packet_sub(demux_stream_t *ds, unsigned char **start)
{
int len;
if (ds->buffer_pos >= ds->buffer_size) {
*start = NULL;
if (!ds->packs)
return -1; // no sub
if (!ds_fill_buffer(ds))
return -1; // EOF
}
len = ds->buffer_size - ds->buffer_pos;
*start = &ds->buffer[ds->buffer_pos];
ds->buffer_pos += len;
return len;
}
struct demux_packet *ds_get_packet2(struct demux_stream *ds, bool repeat_last)
{
// This shouldn't get used together with partial reads
assert(ds->buffer_pos == 0 || ds->buffer_pos >= ds->buffer_size);
if (!repeat_last)
ds_fill_buffer(ds);
ds->buffer_pos = ds->buffer_size;
return ds->current;
}
double ds_get_next_pts(demux_stream_t *ds)
{
demuxer_t *demux = ds->demuxer;
// if we have not read from the "current" packet, consider it
// as the next, otherwise we never get the pts for the first packet.
while (!ds->first && (!ds->current || ds->buffer_pos)) {
if (demux->audio->packs >= MAX_PACKS
|| demux->audio->bytes >= MAX_PACK_BYTES) {
mp_tmsg(MSGT_DEMUXER, MSGL_ERR, "\nToo many audio packets in the buffer: (%d in %d bytes).\n",
demux->audio->packs, demux->audio->bytes);
mp_tmsg(MSGT_DEMUXER, MSGL_HINT, MaybeNI);
return MP_NOPTS_VALUE;
}
if (demux->video->packs >= MAX_PACKS
|| demux->video->bytes >= MAX_PACK_BYTES) {
mp_tmsg(MSGT_DEMUXER, MSGL_ERR, "\nToo many video packets in the buffer: (%d in %d bytes).\n",
demux->video->packs, demux->video->bytes);
mp_tmsg(MSGT_DEMUXER, MSGL_HINT, MaybeNI);
return MP_NOPTS_VALUE;
}
if (!demux_fill_buffer(demux, ds))
return MP_NOPTS_VALUE;
}
// take pts from "current" if we never read from it.
if (ds->current && !ds->buffer_pos)
return ds->current->pts;
return ds->first->pts;
}
// ====================================================================
void demuxer_help(void)
{
int i;
mp_msg(MSGT_DEMUXER, MSGL_INFO, "Available demuxers:\n");
mp_msg(MSGT_DEMUXER, MSGL_INFO, " demuxer: info: (comment)\n");
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_DEMUXERS\n");
for (i = 0; demuxer_list[i]; i++) {
if (demuxer_list[i]->type >= DEMUXER_TYPE_END) // internal type
continue;
if (demuxer_list[i]->comment && strlen(demuxer_list[i]->comment))
mp_msg(MSGT_DEMUXER, MSGL_INFO, "%10s %s (%s)\n",
demuxer_list[i]->name, demuxer_list[i]->info,
demuxer_list[i]->comment);
else
mp_msg(MSGT_DEMUXER, MSGL_INFO, "%10s %s\n",
demuxer_list[i]->name, demuxer_list[i]->info);
}
}
/**
* Get demuxer type for a given demuxer name
*
* @param demuxer_name string with demuxer name of demuxer number
* @param force will be set if demuxer should be forced.
* May be NULL.
* @return DEMUXER_TYPE_xxx, -1 if error or not found
*/
static int get_demuxer_type_from_name(char *demuxer_name, int *force)
{
if (!demuxer_name || !demuxer_name[0])
return DEMUXER_TYPE_UNKNOWN;
if (force)
*force = demuxer_name[0] == '+';
if (demuxer_name[0] == '+')
demuxer_name = &demuxer_name[1];
for (int i = 0; demuxer_list[i]; i++) {
if (demuxer_list[i]->type >= DEMUXER_TYPE_END)
// Can't select special demuxers from commandline
continue;
if (strcmp(demuxer_name, demuxer_list[i]->name) == 0)
return demuxer_list[i]->type;
}
return -1;
}
static struct demuxer *open_given_type(struct MPOpts *opts,
const struct demuxer_desc *desc,
struct stream *stream, bool force,
int audio_id, int video_id, int sub_id,
char *filename,
struct demuxer_params *params)
{
struct demuxer *demuxer;
int fformat;
mp_msg(MSGT_DEMUXER, MSGL_V, "Trying demuxer: %s\n", desc->name);
demuxer = new_demuxer(opts, stream, desc->type, audio_id,
video_id, sub_id, filename);
demuxer->params = params;
if (desc->check_file)
fformat = desc->check_file(demuxer);
else
fformat = desc->type;
if (force)
fformat = desc->type;
if (fformat == 0)
goto fail;
if (fformat == desc->type) {
if (demuxer->filetype)
mp_tmsg(MSGT_DEMUXER, MSGL_INFO, "Detected file format: %s (%s)\n",
demuxer->filetype, desc->shortdesc);
else
mp_tmsg(MSGT_DEMUXER, MSGL_INFO, "Detected file format: %s\n",
desc->shortdesc);
if (demuxer->desc->open) {
struct demuxer *demux2 = demuxer->desc->open(demuxer);
if (!demux2) {
mp_tmsg(MSGT_DEMUXER, MSGL_ERR, "Opening as detected format "
"\"%s\" failed.\n", desc->shortdesc);
goto fail;
}
/* At least demux_mov can return a demux_demuxers instance
* from open() instead of the original fed in. */
demuxer = demux2;
}
demuxer->file_format = fformat;
opts->correct_pts = opts->user_correct_pts;
if (opts->correct_pts < 0)
opts->correct_pts =
demux_control(demuxer, DEMUXER_CTRL_CORRECT_PTS,
NULL) == DEMUXER_CTRL_OK;
return demuxer;
} else {
// demux_mov can return playlist instead of mov
if (fformat == DEMUXER_TYPE_PLAYLIST)
return demuxer; // handled in mplayer.c
/* Internal MPEG PS demuxer check can return other MPEG subtypes
* which don't have their own checks; recurse to try opening as
* the returned type instead. */
free_demuxer(demuxer);
desc = get_demuxer_desc_from_type(fformat);
if (!desc) {
mp_msg(MSGT_DEMUXER, MSGL_ERR,
"BUG: recursion to nonexistent file format\n");
return NULL;
}
return open_given_type(opts, desc, stream, false, audio_id,
video_id, sub_id, filename, params);
}
fail:
free_demuxer(demuxer);
return NULL;
}
struct demuxer *demux_open_withparams(struct MPOpts *opts,
struct stream *stream, int file_format,
char *force_format, int audio_id,
int video_id, int sub_id, char *filename,
struct demuxer_params *params)
{
struct demuxer *demuxer = NULL;
const struct demuxer_desc *desc;
int force = 0;
int demuxer_type;
if ((demuxer_type = get_demuxer_type_from_name(force_format, &force)) < 0) {
mp_msg(MSGT_DEMUXER, MSGL_ERR, "Demuxer %s does not exist.\n",
force_format);
return NULL;
}
if (demuxer_type)
file_format = demuxer_type;
// Some code (e.g. dvd stuff, network code, or extension.c) explicitly
// request certain file formats. The list of formats are always handled by
// libavformat.
// Maybe attempts should be made to convert the mplayer format to the libav
// format, instead of reyling on libav to auto-detect the stream's format
// correctly.
switch (file_format) {
//case DEMUXER_TYPE_MPEG_PS:
//case DEMUXER_TYPE_MPEG_TS:
case DEMUXER_TYPE_Y4M:
case DEMUXER_TYPE_NSV:
case DEMUXER_TYPE_AAC:
case DEMUXER_TYPE_MPC:
file_format = DEMUXER_TYPE_LAVF;
}
// If somebody requested a demuxer check it
if (file_format) {
desc = get_demuxer_desc_from_type(file_format);
if (!desc)
// should only happen with obsolete -demuxer 99 numeric format
return NULL;
return open_given_type(opts, desc, stream, force, audio_id,
video_id, sub_id, filename, params);
}
// Test demuxers with safe file checks
for (int i = 0; (desc = demuxer_list[i]); i++) {
if (desc->safe_check) {
demuxer = open_given_type(opts, desc, stream, false, audio_id,
video_id, sub_id, filename, params);
if (demuxer)
return demuxer;
}
}
// Ok. We're over the stable detectable fileformats, the next ones are
// a bit fuzzy. So by default (extension_parsing==1) try extension-based
// detection first:
if (filename && opts->extension_parsing == 1) {
desc = get_demuxer_desc_from_type(demuxer_type_by_filename(filename));
if (desc)
demuxer = open_given_type(opts, desc, stream, false, audio_id,
video_id, sub_id, filename, params);
if (demuxer)
return demuxer;
}
// Finally try detection for demuxers with unsafe checks
for (int i = 0; (desc = demuxer_list[i]); i++) {
if (!desc->safe_check && desc->check_file) {
demuxer = open_given_type(opts, desc, stream, false, audio_id,
video_id, sub_id, filename, params);
if (demuxer)
return demuxer;
}
}
return NULL;
}
struct demuxer *demux_open(struct MPOpts *opts, stream_t *vs, int file_format,
int audio_id, int video_id, int sub_id,
char *filename)
{
return demux_open_withparams(opts, vs, file_format, opts->demuxer_name,
audio_id, video_id, sub_id, filename, NULL);
}
void demux_flush(demuxer_t *demuxer)
{
ds_free_packs(demuxer->video);
ds_free_packs(demuxer->audio);
ds_free_packs(demuxer->sub);
}
int demux_seek(demuxer_t *demuxer, float rel_seek_secs, float audio_delay,
int flags)
{
if (!demuxer->seekable) {
if (demuxer->file_format == DEMUXER_TYPE_AVI)
mp_tmsg(MSGT_SEEK, MSGL_WARN, "Cannot seek in raw AVI streams. (Index required, try with the -idx switch.)\n");
#ifdef CONFIG_TV
else if (demuxer->file_format == DEMUXER_TYPE_TV)
mp_tmsg(MSGT_SEEK, MSGL_WARN, "TV input is not seekable! (Seeking will probably be for changing channels ;)\n");
#endif
else
mp_tmsg(MSGT_SEEK, MSGL_WARN, "Cannot seek in this file.\n");
return 0;
}
if (rel_seek_secs == MP_NOPTS_VALUE && (flags & SEEK_ABSOLUTE))
return 0;
// clear demux buffers:
demux_flush(demuxer);
demuxer->video->eof = 0;
demuxer->audio->eof = 0;
demuxer->sub->eof = 0;
/* HACK: assume any demuxer used with these streams can cope with
* the stream layer suddenly seeking to a different position under it
* (nothing actually implements DEMUXER_CTRL_RESYNC now).
*/
struct stream *stream = demuxer->stream;
if (stream->type == STREAMTYPE_DVD) {
double pts;
if (flags & SEEK_ABSOLUTE)
pts = 0.0f;
else {
if (demuxer->stream_pts == MP_NOPTS_VALUE)
goto dmx_seek;
pts = demuxer->stream_pts;
}
if (flags & SEEK_FACTOR) {
double tmp = 0;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_TIME_LENGTH,
&tmp) == STREAM_UNSUPPORTED)
goto dmx_seek;
pts += tmp * rel_seek_secs;
} else
pts += rel_seek_secs;
if (stream_control(demuxer->stream, STREAM_CTRL_SEEK_TO_TIME, &pts)
!= STREAM_UNSUPPORTED) {
demux_control(demuxer, DEMUXER_CTRL_RESYNC, NULL);
return 1;
}
}
dmx_seek:
if (demuxer->desc->seek)
demuxer->desc->seek(demuxer, rel_seek_secs, audio_delay, flags);
return 1;
}
int demux_info_add(demuxer_t *demuxer, const char *opt, const char *param)
{
return demux_info_add_bstr(demuxer, bstr0(opt), bstr0(param));
}
int demux_info_add_bstr(demuxer_t *demuxer, struct bstr opt, struct bstr param)
{
char **info = demuxer->info;
int n = 0;
for (n = 0; info && info[2 * n] != NULL; n++) {
if (!bstrcasecmp(opt, bstr0(info[2*n]))) {
if (!bstrcmp(param, bstr0(info[2*n + 1]))) {
mp_msg(MSGT_DEMUX, MSGL_V, "Demuxer info %.*s set to unchanged value %.*s\n",
BSTR_P(opt), BSTR_P(param));
return 0;
}
mp_tmsg(MSGT_DEMUX, MSGL_INFO, "Demuxer info %.*s changed to %.*s\n",
BSTR_P(opt), BSTR_P(param));
talloc_free(info[2*n + 1]);
info[2*n + 1] = talloc_strndup(demuxer->info, param.start, param.len);
return 0;
}
}
info = demuxer->info = talloc_realloc(demuxer, info, char *, 2 * (n + 2));
info[2*n] = talloc_strndup(demuxer->info, opt.start, opt.len);
info[2*n + 1] = talloc_strndup(demuxer->info, param.start, param.len);
memset(&info[2 * (n + 1)], 0, 2 * sizeof(char *));
return 1;
}
int demux_info_print(demuxer_t *demuxer)
{
char **info = demuxer->info;
int n;
if (!info)
return 0;
mp_tmsg(MSGT_DEMUX, MSGL_INFO, "Clip info:\n");
for (n = 0; info[2 * n] != NULL; n++) {
mp_msg(MSGT_DEMUX, MSGL_INFO, " %s: %s\n", info[2 * n],
info[2 * n + 1]);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_CLIP_INFO_NAME%d=%s\n", n,
info[2 * n]);
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_CLIP_INFO_VALUE%d=%s\n", n,
info[2 * n + 1]);
}
mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_CLIP_INFO_N=%d\n", n);
return 0;
}
char *demux_info_get(demuxer_t *demuxer, const char *opt)
{
int i;
char **info = demuxer->info;
for (i = 0; info && info[2 * i] != NULL; i++) {
if (!strcasecmp(opt, info[2 * i]))
return info[2 * i + 1];
}
return NULL;
}
int demux_control(demuxer_t *demuxer, int cmd, void *arg)
{
if (demuxer->desc->control)
return demuxer->desc->control(demuxer, cmd, arg);
return DEMUXER_CTRL_NOTIMPL;
}
struct sh_stream *demuxer_stream_by_demuxer_id(struct demuxer *d,
enum stream_type t, int id)
{
for (int n = 0; n < d->num_streams; n++) {
struct sh_stream *s = d->streams[n];
if (s->type == t && s->demuxer_id == id)
return d->streams[n];
}
return NULL;
}
void demuxer_switch_track(struct demuxer *demuxer, enum stream_type type,
struct sh_stream *stream)
{
assert(!stream || stream->type == type);
int index = stream ? stream->tid : -2;
if (type == STREAM_AUDIO) {
if (demux_control(demuxer, DEMUXER_CTRL_SWITCH_AUDIO, &index)
== DEMUXER_CTRL_NOTIMPL)
demuxer->audio->id = index;
} else if (type == STREAM_VIDEO) {
if (demux_control(demuxer, DEMUXER_CTRL_SWITCH_VIDEO, &index)
== DEMUXER_CTRL_NOTIMPL)
demuxer->video->id = index;
} else if (type == STREAM_SUB) {
int index2 = stream ? stream->stream_index : -2;
if (demuxer->ds[type]->id != index2)
ds_free_packs(demuxer->ds[type]);
demuxer->ds[type]->id = index2;
}
int new_id = demuxer->ds[type]->id;
void *new = NULL;
if (new_id >= 0) {
switch (type) {
case STREAM_VIDEO: new = demuxer->v_streams[new_id]; break;
case STREAM_AUDIO: new = demuxer->a_streams[new_id]; break;
case STREAM_SUB: new = demuxer->s_streams[new_id]; break;
}
}
demuxer->ds[type]->sh = new;
}
int demuxer_add_attachment(demuxer_t *demuxer, struct bstr name,
struct bstr type, struct bstr data)
{
if (!(demuxer->num_attachments % 32))
demuxer->attachments = talloc_realloc(demuxer, demuxer->attachments,
struct demux_attachment,
demuxer->num_attachments + 32);
struct demux_attachment *att =
demuxer->attachments + demuxer->num_attachments;
att->name = talloc_strndup(demuxer->attachments, name.start, name.len);
att->type = talloc_strndup(demuxer->attachments, type.start, type.len);
att->data = talloc_size(demuxer->attachments, data.len);
memcpy(att->data, data.start, data.len);
att->data_size = data.len;
return demuxer->num_attachments++;
}
static int chapter_compare(const void *p1, const void *p2)
{
struct demux_chapter *c1 = (void *)p1;
struct demux_chapter *c2 = (void *)p2;
if (c1->start > c2->start)
return 1;
else if (c1->start < c2->start)
return -1;
return 0;
}
static void demuxer_sort_chapters(demuxer_t *demuxer)
{
qsort(demuxer->chapters, demuxer->num_chapters,
sizeof(struct demux_chapter), chapter_compare);
}
int demuxer_add_chapter(demuxer_t *demuxer, struct bstr name,
uint64_t start, uint64_t end)
{
if (!(demuxer->num_chapters % 32))
demuxer->chapters = talloc_realloc(demuxer, demuxer->chapters,
struct demux_chapter,
demuxer->num_chapters + 32);
demuxer->chapters[demuxer->num_chapters].start = start;
demuxer->chapters[demuxer->num_chapters].end = end;
demuxer->chapters[demuxer->num_chapters].name = name.len ?
talloc_strndup(demuxer->chapters, name.start, name.len) :
talloc_strdup(demuxer->chapters, mp_gtext("unknown"));
demuxer->num_chapters++;
if (demuxer->num_chapters > 1
&& demuxer->chapters[demuxer->num_chapters - 2].start
< demuxer->chapters[demuxer->num_chapters - 1].start)
demuxer_sort_chapters(demuxer);
return 0;
}
/**
* \brief demuxer_seek_chapter() seeks to a chapter in two possible ways:
* either using the demuxer->chapters structure set by the demuxer
* or asking help to the stream layer (e.g. dvd)
* \param chapter - chapter number wished - 0-based
* \param seek_pts set by the function to the pts to seek to (if demuxer->chapters is set)
* \return -1 on error, current chapter if successful
*/
int demuxer_seek_chapter(demuxer_t *demuxer, int chapter, double *seek_pts)
{
int ris;
if (!demuxer->num_chapters || !demuxer->chapters) {
demux_flush(demuxer);
ris = stream_control(demuxer->stream, STREAM_CTRL_SEEK_TO_CHAPTER,
&chapter);
if (ris != STREAM_UNSUPPORTED)
demux_control(demuxer, DEMUXER_CTRL_RESYNC, NULL);
// exit status may be ok, but main() doesn't have to seek itself
// (because e.g. dvds depend on sectors, not on pts)
*seek_pts = -1.0;
return ris != STREAM_UNSUPPORTED ? chapter : -1;
} else { // chapters structure is set in the demuxer
if (chapter >= demuxer->num_chapters)
return -1;
if (chapter < 0)
chapter = 0;
*seek_pts = demuxer->chapters[chapter].start / 1e9;
return chapter;
}
}
int demuxer_get_current_chapter(demuxer_t *demuxer, double time_now)
{
int chapter = -2;
if (!demuxer->num_chapters || !demuxer->chapters) {
if (stream_control(demuxer->stream, STREAM_CTRL_GET_CURRENT_CHAPTER,
&chapter) == STREAM_UNSUPPORTED)
chapter = -2;
} else {
uint64_t now = time_now * 1e9 + 0.5;
for (chapter = demuxer->num_chapters - 1; chapter >= 0; --chapter) {
if (demuxer->chapters[chapter].start <= now)
break;
}
}
return chapter;
}
char *demuxer_chapter_name(demuxer_t *demuxer, int chapter)
{
if (demuxer->num_chapters && demuxer->chapters) {
if (chapter >= 0 && chapter < demuxer->num_chapters
&& demuxer->chapters[chapter].name)
return talloc_strdup(NULL, demuxer->chapters[chapter].name);
}
return NULL;
}
float demuxer_chapter_time(demuxer_t *demuxer, int chapter, float *end)
{
if (demuxer->num_chapters && demuxer->chapters && chapter >= 0
&& chapter < demuxer->num_chapters) {
if (end)
*end = demuxer->chapters[chapter].end / 1e9;
return demuxer->chapters[chapter].start / 1e9;
}
return -1.0;
}
int demuxer_chapter_count(demuxer_t *demuxer)
{
if (!demuxer->num_chapters || !demuxer->chapters) {
int num_chapters = 0;
if (stream_control(demuxer->stream, STREAM_CTRL_GET_NUM_CHAPTERS,
&num_chapters) == STREAM_UNSUPPORTED)
num_chapters = 0;
return num_chapters;
} else
return demuxer->num_chapters;
}
int demuxer_angles_count(demuxer_t *demuxer)
{
int ris, angles = -1;
ris = stream_control(demuxer->stream, STREAM_CTRL_GET_NUM_ANGLES, &angles);
if (ris == STREAM_UNSUPPORTED)
return -1;
return angles;
}
int demuxer_get_current_angle(demuxer_t *demuxer)
{
int ris, curr_angle = -1;
ris = stream_control(demuxer->stream, STREAM_CTRL_GET_ANGLE, &curr_angle);
if (ris == STREAM_UNSUPPORTED)
return -1;
return curr_angle;
}
int demuxer_set_angle(demuxer_t *demuxer, int angle)
{
int ris, angles = -1;
angles = demuxer_angles_count(demuxer);
if ((angles < 1) || (angle > angles))
return -1;
demux_flush(demuxer);
ris = stream_control(demuxer->stream, STREAM_CTRL_SET_ANGLE, &angle);
if (ris == STREAM_UNSUPPORTED)
return -1;
demux_control(demuxer, DEMUXER_CTRL_RESYNC, NULL);
return angle;
}
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