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FFmpeg/libavformat/flvdec.c
Anton Khirnov 09ae7b81ea flvdec: do not create any streams in read_header() 
The current muxer behaviour is to create streams in read_header() based
on the audio/video presence flags, but fill in the stream parameters
later when we actually get some packets for them. This is rather shady,
since other demuxers set the stream parameters immediately when the
stream is created and do not touch the stream codec context after that.

Change the flv demuxer to behave in the same way as other similar
demuxers -- create the streams only when we get a packet for them.
2015-12-12 21:26:48 +01:00

1209 lines
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/*
* FLV demuxer
* Copyright (c) 2003 The FFmpeg 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 FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 VALIDATE_INDEX_TS_THRESH 2500
#define RESYNC_BUFFER_SIZE (1<<20)
typedef struct FLVContext {
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[FLV_STREAM_TYPE_NB];
int new_extradata_size[FLV_STREAM_TYPE_NB];
int last_sample_rate;
int last_channels;
struct {
int64_t dts;
int64_t pos;
} validate_index[2];
int validate_next;
int validate_count;
int searched_for_end;
uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];
int broken_sizes;
} FLVContext;
static int probe(AVProbeData *p, int live)
{
const uint8_t *d = p->buf;
unsigned offset = AV_RB32(d + 5);
if (d[0] == 'F' &&
d[1] == 'L' &&
d[2] == 'V' &&
d[3] < 5 && d[5] == 0 &&
offset + 100 < p->buf_size &&
offset > 8) {
int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
if (live == is_live)
return AVPROBE_SCORE_MAX;
}
return 0;
}
static int flv_probe(AVProbeData *p)
{
return probe(p, 0);
}
static int live_flv_probe(AVProbeData *p)
{
return probe(p, 1);
}
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;
if (s->nb_streams>=3 ||( s->nb_streams==2
&& s->streams[0]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE
&& s->streams[1]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE))
s->ctx_flags &= ~AVFMTCTX_NOHEADER;
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);
}
}
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:
// in case metadata does not otherwise declare samplerate
acodec->sample_rate = 8000;
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:
avpriv_request_sample(s, "Audio codec (%x)",
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;
}
}
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_REALH263:
vcodec->codec_id = AV_CODEC_ID_H263;
break; // Really mean it this time
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) {
ff_alloc_extradata(vcodec, 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;
vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
return 3; // not 4, reading packet type will consume one byte
case FLV_CODECID_MPEG4:
vcodec->codec_id = AV_CODEC_ID_MPEG4;
return 3;
default:
avpriv_request_sample(s, "Video codec (%x)", 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 timeslen = 0, fileposlen = 0, i;
char str_val[256];
int64_t *times = NULL;
int64_t *filepositions = NULL;
int ret = AVERROR(ENOSYS);
int64_t initial_pos = avio_tell(ioc);
if (vstream->nb_index_entries>0) {
av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
return 0;
}
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;
unsigned int arraylen;
// Expect array object in context
if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
break;
arraylen = avio_rb32(ioc);
if (arraylen>>28)
break;
if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
current_array = &times;
timeslen = arraylen;
} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
!filepositions) {
current_array = &filepositions;
fileposlen = arraylen;
} else
// unexpected metatag inside keyframes, will not use such
// metadata for indexing
break;
if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
ret = AVERROR(ENOMEM);
goto finish;
}
for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
goto invalid;
current_array[0][i] = av_int2double(avio_rb64(ioc));
}
if (times && filepositions) {
// All done, exiting at a position allowing amf_parse_object
// to finish parsing the object
ret = 0;
break;
}
}
if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
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 {
invalid:
av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
}
finish:
av_freep(&times);
av_freep(&filepositions);
avio_seek(ioc, initial_pos, SEEK_SET);
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[1024];
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) {
av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
return -1;
}
break;
case AMF_DATA_TYPE_OBJECT:
if ((vstream || astream) && key &&
ioc->seekable &&
!strcmp(KEYFRAMES_TAG, key) && depth == 1)
if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
max_pos) < 0)
av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
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) {
av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
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:
{
unsigned v;
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;
v = avio_r8(ioc);
if (v != AMF_END_OF_OBJECT) {
av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
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
av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
return -1;
}
if (key) {
acodec = astream ? astream->codec : NULL;
vcodec = vstream ? vstream->codec : NULL;
// stream info doesn't live any deeper than the first object
if (depth == 1) {
if (amf_type == AMF_DATA_TYPE_NUMBER ||
amf_type == AMF_DATA_TYPE_BOOL) {
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_SUBTITLE);
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) {
int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
flv_set_audio_codec(s, astream, acodec, id);
} else if (!strcmp(key, "audiosamplerate") && acodec) {
acodec->sample_rate = num_val;
} else if (!strcmp(key, "audiosamplesize") && acodec) {
acodec->bits_per_coded_sample = num_val;
} else if (!strcmp(key, "stereo") && acodec) {
acodec->channels = num_val + 1;
acodec->channel_layout = acodec->channels == 2 ?
AV_CH_LAYOUT_STEREO :
AV_CH_LAYOUT_MONO;
} else if (!strcmp(key, "width") && vcodec) {
vcodec->width = num_val;
} else if (!strcmp(key, "height") && vcodec) {
vcodec->height = num_val;
}
}
}
if (amf_type == AMF_DATA_TYPE_STRING) {
if (!strcmp(key, "encoder")) {
int version = -1;
if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
if (version > 0 && version <= 655)
flv->broken_sizes = 1;
}
} else if (!strcmp(key, "metadatacreator") && !strcmp(str_val, "MEGA")) {
flv->broken_sizes = 1;
}
}
}
if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
((!acodec && !strcmp(key, "audiocodecid")) ||
(!vcodec && !strcmp(key, "videocodecid"))))
s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
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") ||
!strcmp(key, "datastream"))
return 0;
s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
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;
}
#define TYPE_ONTEXTDATA 1
#define TYPE_ONCAPTION 2
#define TYPE_ONCAPTIONINFO 3
#define TYPE_UNKNOWN 9
static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
{
AMFDataType type;
AVStream *stream, *astream, *vstream;
AVStream av_unused *dstream;
AVIOContext *ioc;
int i;
// only needs to hold the string "onMetaData".
// Anything longer is something we don't want.
char buffer[32];
astream = NULL;
vstream = NULL;
dstream = 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 TYPE_UNKNOWN;
if (!strcmp(buffer, "onTextData"))
return TYPE_ONTEXTDATA;
if (!strcmp(buffer, "onCaption"))
return TYPE_ONCAPTION;
if (!strcmp(buffer, "onCaptionInfo"))
return TYPE_ONCAPTIONINFO;
if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {
av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
return TYPE_UNKNOWN;
}
// 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_VIDEO)
vstream = stream;
else if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)
astream = stream;
else if (stream->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
dstream = 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);
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);
// Flag doesn't indicate whether or not there is script-data present. Must
// create that stream if it's encountered.
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)
{
int i;
FLVContext *flv = s->priv_data;
for (i=0; i<FLV_STREAM_TYPE_NB; i++)
av_freep(&flv->new_extradata[i]);
return 0;
}
static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
{
av_freep(&st->codec->extradata);
if (ff_get_extradata(st->codec, s->pb, size) < 0)
return AVERROR(ENOMEM);
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 +
AV_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 amf_skip_tag(AVIOContext *pb, AMFDataType type)
{
int nb = -1, ret, parse_name = 1;
switch (type) {
case AMF_DATA_TYPE_NUMBER:
avio_skip(pb, 8);
break;
case AMF_DATA_TYPE_BOOL:
avio_skip(pb, 1);
break;
case AMF_DATA_TYPE_STRING:
avio_skip(pb, avio_rb16(pb));
break;
case AMF_DATA_TYPE_ARRAY:
parse_name = 0;
case AMF_DATA_TYPE_MIXEDARRAY:
nb = avio_rb32(pb);
case AMF_DATA_TYPE_OBJECT:
while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
if (parse_name) {
int size = avio_rb16(pb);
if (!size) {
avio_skip(pb, 1);
break;
}
avio_skip(pb, size);
}
if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
return ret;
}
break;
case AMF_DATA_TYPE_NULL:
case AMF_DATA_TYPE_OBJECT_END:
break;
default:
return AVERROR_INVALIDDATA;
}
return 0;
}
static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
int64_t dts, int64_t next)
{
AVIOContext *pb = s->pb;
AVStream *st = NULL;
char buf[20];
int ret = AVERROR_INVALIDDATA;
int i, length = -1;
int array = 0;
switch (avio_r8(pb)) {
case AMF_DATA_TYPE_ARRAY:
array = 1;
case AMF_DATA_TYPE_MIXEDARRAY:
avio_seek(pb, 4, SEEK_CUR);
case AMF_DATA_TYPE_OBJECT:
break;
default:
goto skip;
}
while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
AMFDataType type = avio_r8(pb);
if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
length = avio_rb16(pb);
ret = av_get_packet(pb, pkt, length);
if (ret < 0)
goto skip;
else
break;
} else {
if ((ret = amf_skip_tag(pb, type)) < 0)
goto skip;
}
}
if (length < 0) {
ret = AVERROR_INVALIDDATA;
goto skip;
}
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
break;
}
if (i == s->nb_streams) {
st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
if (!st)
return AVERROR(ENOMEM);
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;
skip:
avio_seek(s->pb, next + 4, SEEK_SET);
return ret;
}
static int resync(AVFormatContext *s)
{
FLVContext *flv = s->priv_data;
int64_t i;
int64_t pos = avio_tell(s->pb);
for (i=0; !avio_feof(s->pb); i++) {
int j = i & (RESYNC_BUFFER_SIZE-1);
int j1 = j + RESYNC_BUFFER_SIZE;
flv->resync_buffer[j ] =
flv->resync_buffer[j1] = avio_r8(s->pb);
if (i > 22) {
unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
unsigned size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
unsigned size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
if (size1 == lsize1 - 11 && size2 == lsize2 - 11) {
avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
return 1;
}
}
}
}
}
return AVERROR_EOF;
}
static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
FLVContext *flv = s->priv_data;
int ret, i, size, flags;
enum FlvTagType type;
int stream_type=-1;
int64_t next, pos, meta_pos;
int64_t dts, pts = AV_NOPTS_VALUE;
int av_uninit(channels);
int av_uninit(sample_rate);
AVStream *st = NULL;
int last = -1;
int orig_size;
retry:
/* pkt size is repeated at end. skip it */
pos = avio_tell(s->pb);
type = (avio_r8(s->pb) & 0x1F);
orig_size =
size = avio_rb24(s->pb);
dts = avio_rb24(s->pb);
dts |= (unsigned)avio_r8(s->pb) << 24;
av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));
if (avio_feof(s->pb))
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) {
ret = FFERROR_REDO;
goto leave;
}
next = size + avio_tell(s->pb);
if (type == FLV_TAG_TYPE_AUDIO) {
stream_type = FLV_STREAM_TYPE_AUDIO;
flags = avio_r8(s->pb);
size--;
} else if (type == FLV_TAG_TYPE_VIDEO) {
stream_type = FLV_STREAM_TYPE_VIDEO;
flags = avio_r8(s->pb);
size--;
if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
goto skip;
} else if (type == FLV_TAG_TYPE_META) {
stream_type=FLV_STREAM_TYPE_DATA;
if (size > 13 + 1 + 4) { // Header-type metadata stuff
int type;
meta_pos = avio_tell(s->pb);
type = flv_read_metabody(s, next);
if (type == 0 && dts == 0 || type < 0 || type == TYPE_UNKNOWN) {
if (type < 0 && flv->validate_count &&
flv->validate_index[0].pos > next &&
flv->validate_index[0].pos - 4 < next
) {
av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
next = flv->validate_index[0].pos - 4;
}
goto skip;
} else if (type == TYPE_ONTEXTDATA) {
avpriv_request_sample(s, "OnTextData packet");
return flv_data_packet(s, pkt, dts, next);
} else if (type == TYPE_ONCAPTION) {
return flv_data_packet(s, pkt, dts, next);
}
avio_seek(s->pb, meta_pos, SEEK_SET);
}
} else {
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);
ret = FFERROR_REDO;
goto leave;
}
/* skip empty data packets */
if (!size) {
ret = FFERROR_REDO;
goto leave;
}
/* now find stream */
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (stream_type == FLV_STREAM_TYPE_AUDIO) {
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
(s->audio_codec_id || flv_same_audio_codec(st->codec, flags)))
break;
} else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
(s->video_codec_id || flv_same_video_codec(st->codec, flags)))
break;
} else if (stream_type == FLV_STREAM_TYPE_DATA) {
if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
break;
}
}
if (i == s->nb_streams) {
static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};
av_log(s, AV_LOG_WARNING, "%s stream discovered after head already parsed\n", av_get_media_type_string(stream_types[stream_type]));
st = create_stream(s, stream_types[stream_type]);
if (!st)
return AVERROR(ENOMEM);
}
av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
if (s->pb->seekable &&
((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
stream_type == FLV_STREAM_TYPE_AUDIO))
av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
|| st->discard >= AVDISCARD_ALL
) {
avio_seek(s->pb, next, SEEK_SET);
ret = FFERROR_REDO;
goto leave;
}
// 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) && !flv->searched_for_end) {
int size;
const int64_t pos = avio_tell(s->pb);
// Read the last 4 bytes of the file, this should be the size of the
// previous FLV tag. Use the timestamp of its payload as duration.
int64_t fsize = avio_size(s->pb);
retry_duration:
avio_seek(s->pb, fsize - 4, SEEK_SET);
size = avio_rb32(s->pb);
// Seek to the start of the last FLV tag at position (fsize - 4 - size)
// but skip the byte indicating the type.
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;
if (ts)
s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
else if (fsize >= 8 && fsize - 8 >= size) {
fsize -= size+4;
goto retry_duration;
}
}
avio_seek(s->pb, pos, SEEK_SET);
flv->searched_for_end = 1;
}
if (stream_type == FLV_STREAM_TYPE_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 = {0};
ctx.sample_rate = sample_rate;
ctx.bits_per_coded_sample = bits_per_coded_sample;
flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
sample_rate = ctx.sample_rate;
}
} else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
} else if (stream_type == FLV_STREAM_TYPE_DATA) {
st->codec->codec_id = AV_CODEC_ID_TEXT;
}
if (st->codec->codec_id == AV_CODEC_ID_AAC ||
st->codec->codec_id == AV_CODEC_ID_H264 ||
st->codec->codec_id == AV_CODEC_ID_MPEG4) {
int type = avio_r8(s->pb);
size--;
if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) {
// sign extension
int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
pts = dts + cts;
if (cts < 0) { // dts might be wrong
if (!flv->wrong_dts)
av_log(s, AV_LOG_WARNING,
"Negative cts, previous timestamps might be wrong.\n");
flv->wrong_dts = 1;
} else if (FFABS(dts - pts) > 1000*60*15) {
av_log(s, AV_LOG_WARNING,
"invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
dts = pts = AV_NOPTS_VALUE;
}
}
if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC ||
st->codec->codec_id == AV_CODEC_ID_H264)) {
AVDictionaryEntry *t;
if (st->codec->extradata) {
if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
return ret;
ret = FFERROR_REDO;
goto leave;
}
if ((ret = flv_get_extradata(s, st, size)) < 0)
return ret;
/* Workaround for buggy Omnia A/XE encoder */
t = av_dict_get(s->metadata, "Encoder", NULL, 0);
if (st->codec->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
st->codec->extradata_size = 2;
if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {
MPEG4AudioConfig cfg;
if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
st->codec->extradata_size * 8, 1) >= 0) {
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_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",
st->codec->channels, st->codec->sample_rate);
}
}
ret = FFERROR_REDO;
goto leave;
}
}
/* skip empty data packets */
if (!size) {
ret = FFERROR_REDO;
goto leave;
}
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
pkt->dts = dts;
pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
pkt->stream_index = st->index;
if (flv->new_extradata[stream_type]) {
uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
flv->new_extradata_size[stream_type]);
if (side) {
memcpy(side, flv->new_extradata[stream_type],
flv->new_extradata_size[stream_type]);
av_freep(&flv->new_extradata[stream_type]);
flv->new_extradata_size[stream_type] = 0;
}
}
if (stream_type == FLV_STREAM_TYPE_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 ( stream_type == FLV_STREAM_TYPE_AUDIO ||
((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
stream_type == FLV_STREAM_TYPE_DATA)
pkt->flags |= AV_PKT_FLAG_KEY;
leave:
last = avio_rb32(s->pb);
if (last != orig_size + 11 &&
(last != orig_size || !last) &&
!flv->broken_sizes) {
av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d\n", last, orig_size + 11);
avio_seek(s->pb, pos + 1, SEEK_SET);
ret = resync(s);
av_packet_unref(pkt);
if (ret >= 0) {
goto retry;
}
}
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 to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
{ NULL }
};
static const AVClass flv_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 = &flv_class,
};
static const AVClass live_flv_class = {
.class_name = "live_flvdec",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVInputFormat ff_live_flv_demuxer = {
.name = "live_flv",
.long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
.priv_data_size = sizeof(FLVContext),
.read_probe = live_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 = &live_flv_class,
.flags = AVFMT_TS_DISCONT
};
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