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FFmpeg/libavformat/flvdec.c
Martin Storsjö c5a738ca4e flvdec: Check the return value of a malloc 
The callers of this function can't report errors sanely. If this
one malloc fails, don't write the extradata byte, make sure we
try to malloc it the next time we're called instead, and make sure
we still consume the input data byte.

CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
2013-03-02 00:39:37 +02:00

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/*
* FLV demuxer
* Copyright (c) 2003 The Libav Project
*
* This demuxer will generate a 1 byte extradata for VP6F content.
* It is composed of:
* - upper 4bits: difference between encoded width and visible width
* - lower 4bits: difference between encoded height and visible height
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "libavutil/intfloat.h"
#include "libavutil/mathematics.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/mpeg4audio.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "flv.h"
#define KEYFRAMES_TAG "keyframes"
#define KEYFRAMES_TIMESTAMP_TAG "times"
#define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
#define VALIDATE_INDEX_TS_THRESH 2500
typedef struct {
const AVClass *class; ///< Class for private options.
int trust_metadata; ///< configure streams according onMetaData
int wrong_dts; ///< wrong dts due to negative cts
uint8_t *new_extradata[2];
int new_extradata_size[2];
int last_sample_rate;
int last_channels;
struct {
int64_t dts;
int64_t pos;
} validate_index[2];
int validate_next;
int validate_count;
} FLVContext;
static int flv_probe(AVProbeData *p)
{
const uint8_t *d;
d = p->buf;
if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
return AVPROBE_SCORE_MAX;
}
return 0;
}
static AVStream *create_stream(AVFormatContext *s, int codec_type)
{
AVStream *st = avformat_new_stream(s, NULL);
if (!st)
return NULL;
st->codec->codec_type = codec_type;
avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
return st;
}
static int flv_same_audio_codec(AVCodecContext *acodec, int flags)
{
int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
int codec_id;
if (!acodec->codec_id && !acodec->codec_tag)
return 1;
if (acodec->bits_per_coded_sample != bits_per_coded_sample)
return 0;
switch(flv_codecid) {
//no distinction between S16 and S8 PCM codec flags
case FLV_CODECID_PCM:
codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 :
#if HAVE_BIGENDIAN
AV_CODEC_ID_PCM_S16BE;
#else
AV_CODEC_ID_PCM_S16LE;
#endif
return codec_id == acodec->codec_id;
case FLV_CODECID_PCM_LE:
codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE;
return codec_id == acodec->codec_id;
case FLV_CODECID_AAC:
return acodec->codec_id == AV_CODEC_ID_AAC;
case FLV_CODECID_ADPCM:
return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;
case FLV_CODECID_SPEEX:
return acodec->codec_id == AV_CODEC_ID_SPEEX;
case FLV_CODECID_MP3:
return acodec->codec_id == AV_CODEC_ID_MP3;
case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
case FLV_CODECID_NELLYMOSER:
return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;
case FLV_CODECID_PCM_MULAW:
return acodec->sample_rate == 8000 &&
acodec->codec_id == AV_CODEC_ID_PCM_MULAW;
case FLV_CODECID_PCM_ALAW:
return acodec->sample_rate = 8000 &&
acodec->codec_id == AV_CODEC_ID_PCM_ALAW;
default:
return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
}
return 0;
}
static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid) {
switch(flv_codecid) {
//no distinction between S16 and S8 PCM codec flags
case FLV_CODECID_PCM:
acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 :
#if HAVE_BIGENDIAN
AV_CODEC_ID_PCM_S16BE;
#else
AV_CODEC_ID_PCM_S16LE;
#endif
break;
case FLV_CODECID_PCM_LE:
acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; break;
case FLV_CODECID_AAC : acodec->codec_id = AV_CODEC_ID_AAC; break;
case FLV_CODECID_ADPCM: acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; break;
case FLV_CODECID_SPEEX:
acodec->codec_id = AV_CODEC_ID_SPEEX;
acodec->sample_rate = 16000;
break;
case FLV_CODECID_MP3 : acodec->codec_id = AV_CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
break;
case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
acodec->sample_rate = 16000;
acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
break;
case FLV_CODECID_NELLYMOSER:
acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
break;
case FLV_CODECID_PCM_MULAW:
acodec->sample_rate = 8000;
acodec->codec_id = AV_CODEC_ID_PCM_MULAW;
break;
case FLV_CODECID_PCM_ALAW:
acodec->sample_rate = 8000;
acodec->codec_id = AV_CODEC_ID_PCM_ALAW;
break;
default:
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
}
}
static int flv_same_video_codec(AVCodecContext *vcodec, int flags)
{
int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
if (!vcodec->codec_id && !vcodec->codec_tag)
return 1;
switch (flv_codecid) {
case FLV_CODECID_H263:
return vcodec->codec_id == AV_CODEC_ID_FLV1;
case FLV_CODECID_SCREEN:
return vcodec->codec_id == AV_CODEC_ID_FLASHSV;
case FLV_CODECID_SCREEN2:
return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;
case FLV_CODECID_VP6:
return vcodec->codec_id == AV_CODEC_ID_VP6F;
case FLV_CODECID_VP6A:
return vcodec->codec_id == AV_CODEC_ID_VP6A;
case FLV_CODECID_H264:
return vcodec->codec_id == AV_CODEC_ID_H264;
default:
return vcodec->codec_tag == flv_codecid;
}
return 0;
}
static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid, int read) {
AVCodecContext *vcodec = vstream->codec;
switch(flv_codecid) {
case FLV_CODECID_H263 : vcodec->codec_id = AV_CODEC_ID_FLV1 ; break;
case FLV_CODECID_SCREEN: vcodec->codec_id = AV_CODEC_ID_FLASHSV; break;
case FLV_CODECID_SCREEN2: vcodec->codec_id = AV_CODEC_ID_FLASHSV2; break;
case FLV_CODECID_VP6 : vcodec->codec_id = AV_CODEC_ID_VP6F ;
case FLV_CODECID_VP6A :
if(flv_codecid == FLV_CODECID_VP6A)
vcodec->codec_id = AV_CODEC_ID_VP6A;
if (read) {
if (vcodec->extradata_size != 1) {
vcodec->extradata = av_malloc(1);
if (vcodec->extradata)
vcodec->extradata_size = 1;
}
if (vcodec->extradata)
vcodec->extradata[0] = avio_r8(s->pb);
else
avio_skip(s->pb, 1);
}
return 1; // 1 byte body size adjustment for flv_read_packet()
case FLV_CODECID_H264:
vcodec->codec_id = AV_CODEC_ID_H264;
return 3; // not 4, reading packet type will consume one byte
default:
av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
vcodec->codec_tag = flv_codecid;
}
return 0;
}
static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
int length = avio_rb16(ioc);
if(length >= buffsize) {
avio_skip(ioc, length);
return -1;
}
avio_read(ioc, buffer, length);
buffer[length] = '\0';
return length;
}
static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
FLVContext *flv = s->priv_data;
unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i;
double num_val;
char str_val[256];
int64_t *times = NULL;
int64_t *filepositions = NULL;
int ret = AVERROR(ENOSYS);
int64_t initial_pos = avio_tell(ioc);
if (s->flags & AVFMT_FLAG_IGNIDX)
return 0;
while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
int64_t* current_array;
// Expect array object in context
if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
break;
arraylen = avio_rb32(ioc);
if (arraylen >> 28)
break;
/*
* Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
* for indexing
*/
if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
ret = AVERROR(ENOMEM);
goto finish;
}
timeslen = arraylen;
current_array = times;
} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) {
if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
ret = AVERROR(ENOMEM);
goto finish;
}
fileposlen = arraylen;
current_array = filepositions;
} else // unexpected metatag inside keyframes, will not use such metadata for indexing
break;
for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
goto finish;
num_val = av_int2double(avio_rb64(ioc));
current_array[i] = num_val;
}
if (times && filepositions) {
// All done, exiting at a position allowing amf_parse_object
// to finish parsing the object
ret = 0;
break;
}
}
if (!ret && timeslen == fileposlen) {
for (i = 0; i < fileposlen; i++) {
av_add_index_entry(vstream, filepositions[i], times[i]*1000,
0, 0, AVINDEX_KEYFRAME);
if (i < 2) {
flv->validate_index[i].pos = filepositions[i];
flv->validate_index[i].dts = times[i] * 1000;
flv->validate_count = i + 1;
}
}
} else
av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
finish:
av_freep(&times);
av_freep(&filepositions);
// If we got unexpected data, but successfully reset back to
// the start pos, the caller can continue parsing
if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0)
return 0;
return ret;
}
static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
AVCodecContext *acodec, *vcodec;
FLVContext *flv = s->priv_data;
AVIOContext *ioc;
AMFDataType amf_type;
char str_val[256];
double num_val;
num_val = 0;
ioc = s->pb;
amf_type = avio_r8(ioc);
switch(amf_type) {
case AMF_DATA_TYPE_NUMBER:
num_val = av_int2double(avio_rb64(ioc)); break;
case AMF_DATA_TYPE_BOOL:
num_val = avio_r8(ioc); break;
case AMF_DATA_TYPE_STRING:
if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
return -1;
break;
case AMF_DATA_TYPE_OBJECT:
if ((vstream || astream) && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
max_pos) < 0)
return -1;
while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
if (amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
return -1; //if we couldn't skip, bomb out.
}
if(avio_r8(ioc) != AMF_END_OF_OBJECT)
return -1;
break;
case AMF_DATA_TYPE_NULL:
case AMF_DATA_TYPE_UNDEFINED:
case AMF_DATA_TYPE_UNSUPPORTED:
break; //these take up no additional space
case AMF_DATA_TYPE_MIXEDARRAY:
avio_skip(ioc, 4); //skip 32-bit max array index
while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
//this is the only case in which we would want a nested parse to not skip over the object
if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
return -1;
}
if(avio_r8(ioc) != AMF_END_OF_OBJECT)
return -1;
break;
case AMF_DATA_TYPE_ARRAY: {
unsigned int arraylen, i;
arraylen = avio_rb32(ioc);
for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
return -1; //if we couldn't skip, bomb out.
}
}
break;
case AMF_DATA_TYPE_DATE:
avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
break;
default: //unsupported type, we couldn't skip
return -1;
}
if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
acodec = astream ? astream->codec : NULL;
vcodec = vstream ? vstream->codec : NULL;
if (amf_type == AMF_DATA_TYPE_NUMBER) {
if (!strcmp(key, "duration"))
s->duration = num_val * AV_TIME_BASE;
else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
vcodec->bit_rate = num_val * 1024.0;
else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
acodec->bit_rate = num_val * 1024.0;
else if (!strcmp(key, "datastream")) {
AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_id = AV_CODEC_ID_TEXT;
} else if (flv->trust_metadata) {
if (!strcmp(key, "videocodecid") && vcodec) {
flv_set_video_codec(s, vstream, num_val, 0);
} else
if (!strcmp(key, "audiocodecid") && acodec) {
flv_set_audio_codec(s, astream, acodec, num_val);
} else
if (!strcmp(key, "audiosamplerate") && acodec) {
acodec->sample_rate = num_val;
} else
if (!strcmp(key, "width") && vcodec) {
vcodec->width = num_val;
} else
if (!strcmp(key, "height") && vcodec) {
vcodec->height = num_val;
}
}
}
if (!strcmp(key, "duration") ||
!strcmp(key, "filesize") ||
!strcmp(key, "width") ||
!strcmp(key, "height") ||
!strcmp(key, "videodatarate") ||
!strcmp(key, "framerate") ||
!strcmp(key, "videocodecid") ||
!strcmp(key, "audiodatarate") ||
!strcmp(key, "audiosamplerate") ||
!strcmp(key, "audiosamplesize") ||
!strcmp(key, "stereo") ||
!strcmp(key, "audiocodecid"))
return 0;
if(amf_type == AMF_DATA_TYPE_BOOL) {
av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
av_dict_set(&s->metadata, key, str_val, 0);
} else if(amf_type == AMF_DATA_TYPE_NUMBER) {
snprintf(str_val, sizeof(str_val), "%.f", num_val);
av_dict_set(&s->metadata, key, str_val, 0);
} else if (amf_type == AMF_DATA_TYPE_STRING)
av_dict_set(&s->metadata, key, str_val, 0);
}
return 0;
}
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
AMFDataType type;
AVStream *stream, *astream, *vstream;
AVIOContext *ioc;
int i;
char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
astream = NULL;
vstream = NULL;
ioc = s->pb;
//first object needs to be "onMetaData" string
type = avio_r8(ioc);
if (type != AMF_DATA_TYPE_STRING ||
amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
return -1;
if (!strcmp(buffer, "onTextData"))
return 1;
if (strcmp(buffer, "onMetaData"))
return -1;
//find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
for(i = 0; i < s->nb_streams; i++) {
stream = s->streams[i];
if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
}
//parse the second object (we want a mixed array)
if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
return -1;
return 0;
}
static int flv_read_header(AVFormatContext *s)
{
int offset, flags;
avio_skip(s->pb, 4);
flags = avio_r8(s->pb);
/* old flvtool cleared this field */
/* FIXME: better fix needed */
if (!flags) {
flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
}
s->ctx_flags |= AVFMTCTX_NOHEADER;
if(flags & FLV_HEADER_FLAG_HASVIDEO){
if(!create_stream(s, AVMEDIA_TYPE_VIDEO))
return AVERROR(ENOMEM);
}
if(flags & FLV_HEADER_FLAG_HASAUDIO){
if(!create_stream(s, AVMEDIA_TYPE_AUDIO))
return AVERROR(ENOMEM);
}
offset = avio_rb32(s->pb);
avio_seek(s->pb, offset, SEEK_SET);
avio_skip(s->pb, 4);
s->start_time = 0;
return 0;
}
static int flv_read_close(AVFormatContext *s)
{
FLVContext *flv = s->priv_data;
av_freep(&flv->new_extradata[0]);
av_freep(&flv->new_extradata[1]);
return 0;
}
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
{
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = size;
avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
return 0;
}
static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
int size)
{
av_free(flv->new_extradata[stream]);
flv->new_extradata[stream] = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!flv->new_extradata[stream])
return AVERROR(ENOMEM);
flv->new_extradata_size[stream] = size;
avio_read(pb, flv->new_extradata[stream], size);
return 0;
}
static void clear_index_entries(AVFormatContext *s, int64_t pos)
{
int i, j, out;
av_log(s, AV_LOG_WARNING, "Found invalid index entries, clearing the index.\n");
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
/* Remove all index entries that point to >= pos */
out = 0;
for (j = 0; j < st->nb_index_entries; j++) {
if (st->index_entries[j].pos < pos)
st->index_entries[out++] = st->index_entries[j];
}
st->nb_index_entries = out;
}
}
static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
int64_t dts, int64_t next)
{
int ret = AVERROR_INVALIDDATA, i;
AVIOContext *pb = s->pb;
AVStream *st = NULL;
AMFDataType type;
char buf[20];
int length;
type = avio_r8(pb);
if (type == AMF_DATA_TYPE_MIXEDARRAY)
avio_seek(pb, 4, SEEK_CUR);
else if (type != AMF_DATA_TYPE_OBJECT)
goto out;
amf_get_string(pb, buf, sizeof(buf));
if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING)
goto out;
amf_get_string(pb, buf, sizeof(buf));
//FIXME parse it as codec_id
amf_get_string(pb, buf, sizeof(buf));
if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING)
goto out;
length = avio_rb16(pb);
ret = av_get_packet(s->pb, pkt, length);
if (ret < 0) {
ret = AVERROR(EIO);
goto out;
}
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_DATA)
break;
}
if (i == s->nb_streams) {
st = create_stream(s, AVMEDIA_TYPE_DATA);
if (!st)
goto out;
st->codec->codec_id = AV_CODEC_ID_TEXT;
}
pkt->dts = dts;
pkt->pts = dts;
pkt->size = ret;
pkt->stream_index = st->index;
pkt->flags |= AV_PKT_FLAG_KEY;
avio_seek(s->pb, next + 4, SEEK_SET);
out:
return ret;
}
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
FLVContext *flv = s->priv_data;
int ret, i, type, size, flags, is_audio;
int64_t next, pos;
int64_t dts, pts = AV_NOPTS_VALUE;
int sample_rate = 0, channels = 0;
AVStream *st = NULL;
for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
pos = avio_tell(s->pb);
type = avio_r8(s->pb);
size = avio_rb24(s->pb);
dts = avio_rb24(s->pb);
dts |= avio_r8(s->pb) << 24;
av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
if (s->pb->eof_reached)
return AVERROR_EOF;
avio_skip(s->pb, 3); /* stream id, always 0 */
flags = 0;
if (flv->validate_next < flv->validate_count) {
int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
if (pos == validate_pos) {
if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
VALIDATE_INDEX_TS_THRESH) {
flv->validate_next++;
} else {
clear_index_entries(s, validate_pos);
flv->validate_count = 0;
}
} else if (pos > validate_pos) {
clear_index_entries(s, validate_pos);
flv->validate_count = 0;
}
}
if(size == 0)
continue;
next= size + avio_tell(s->pb);
if (type == FLV_TAG_TYPE_AUDIO) {
is_audio=1;
flags = avio_r8(s->pb);
size--;
} else if (type == FLV_TAG_TYPE_VIDEO) {
is_audio=0;
flags = avio_r8(s->pb);
size--;
if ((flags & 0xf0) == 0x50) /* video info / command frame */
goto skip;
} else {
if (type == FLV_TAG_TYPE_META && size > 13+1+4)
if (flv_read_metabody(s, next) > 0) {
return flv_data_packet(s, pkt, dts, next);
}
else /* skip packet */
av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
skip:
avio_seek(s->pb, next, SEEK_SET);
continue;
}
/* skip empty data packets */
if (!size)
continue;
/* now find stream */
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (is_audio && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
if (flv_same_audio_codec(st->codec, flags)) {
break;
}
} else
if (!is_audio && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
if (flv_same_video_codec(st->codec, flags)) {
break;
}
}
}
if(i == s->nb_streams){
st = create_stream(s,
is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO);
}
av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
|| st->discard >= AVDISCARD_ALL
){
avio_seek(s->pb, next, SEEK_SET);
continue;
}
if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
break;
}
// if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
int size;
const int64_t pos= avio_tell(s->pb);
const int64_t fsize= avio_size(s->pb);
avio_seek(s->pb, fsize-4, SEEK_SET);
size= avio_rb32(s->pb);
avio_seek(s->pb, fsize-3-size, SEEK_SET);
if(size == avio_rb24(s->pb) + 11){
uint32_t ts = avio_rb24(s->pb);
ts |= avio_r8(s->pb) << 24;
s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
}
avio_seek(s->pb, pos, SEEK_SET);
}
if(is_audio){
int bits_per_coded_sample;
channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
st->codec->channels = channels;
st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
AV_CH_LAYOUT_STEREO;
st->codec->sample_rate = sample_rate;
st->codec->bits_per_coded_sample = bits_per_coded_sample;
}
if(!st->codec->codec_id){
flv_set_audio_codec(s, st, st->codec, flags & FLV_AUDIO_CODECID_MASK);
flv->last_sample_rate = sample_rate = st->codec->sample_rate;
flv->last_channels = channels = st->codec->channels;
} else {
AVCodecContext ctx;
ctx.sample_rate = sample_rate;
flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
sample_rate = ctx.sample_rate;
}
}else{
size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
}
if (st->codec->codec_id == AV_CODEC_ID_AAC ||
st->codec->codec_id == AV_CODEC_ID_H264) {
int type = avio_r8(s->pb);
size--;
if (st->codec->codec_id == AV_CODEC_ID_H264) {
int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
pts = dts + cts;
if (cts < 0) { // dts are wrong
flv->wrong_dts = 1;
av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
}
if (flv->wrong_dts)
dts = AV_NOPTS_VALUE;
}
if (type == 0) {
if (st->codec->extradata) {
if ((ret = flv_queue_extradata(flv, s->pb, is_audio, size)) < 0)
return ret;
ret = AVERROR(EAGAIN);
goto leave;
}
if ((ret = flv_get_extradata(s, st, size)) < 0)
return ret;
if (st->codec->codec_id == AV_CODEC_ID_AAC) {
MPEG4AudioConfig cfg;
avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
st->codec->extradata_size * 8, 1);
st->codec->channels = cfg.channels;
st->codec->channel_layout = 0;
if (cfg.ext_sample_rate)
st->codec->sample_rate = cfg.ext_sample_rate;
else
st->codec->sample_rate = cfg.sample_rate;
av_dlog(s, "mp4a config channels %d sample rate %d\n",
st->codec->channels, st->codec->sample_rate);
}
ret = AVERROR(EAGAIN);
goto leave;
}
}
/* skip empty data packets */
if (!size) {
ret = AVERROR(EAGAIN);
goto leave;
}
ret= av_get_packet(s->pb, pkt, size);
if (ret < 0) {
return AVERROR(EIO);
}
/* note: we need to modify the packet size here to handle the last
packet */
pkt->size = ret;
pkt->dts = dts;
pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
pkt->stream_index = st->index;
if (flv->new_extradata[is_audio]) {
uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
flv->new_extradata_size[is_audio]);
if (side) {
memcpy(side, flv->new_extradata[is_audio],
flv->new_extradata_size[is_audio]);
av_freep(&flv->new_extradata[is_audio]);
flv->new_extradata_size[is_audio] = 0;
}
}
if (is_audio && (sample_rate != flv->last_sample_rate ||
channels != flv->last_channels)) {
flv->last_sample_rate = sample_rate;
flv->last_channels = channels;
ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
}
if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
pkt->flags |= AV_PKT_FLAG_KEY;
leave:
avio_skip(s->pb, 4);
return ret;
}
static int flv_read_seek(AVFormatContext *s, int stream_index,
int64_t ts, int flags)
{
FLVContext *flv = s->priv_data;
flv->validate_count = 0;
return avio_seek_time(s->pb, stream_index, ts, flags);
}
#define OFFSET(x) offsetof(FLVContext, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "flv_metadata", "Allocate streams according the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD},
{ NULL }
};
static const AVClass class = {
.class_name = "flvdec",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_flv_demuxer = {
.name = "flv",
.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
.priv_data_size = sizeof(FLVContext),
.read_probe = flv_probe,
.read_header = flv_read_header,
.read_packet = flv_read_packet,
.read_seek = flv_read_seek,
.read_close = flv_read_close,
.extensions = "flv",
.priv_class = &class,
};
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