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1060 lines
36 KiB
1060 lines
36 KiB
/* |
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* FLV demuxer |
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* Copyright (c) 2003 The FFmpeg Project |
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* |
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* This demuxer will generate a 1 byte extradata for VP6F content. |
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* It is composed of: |
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* - upper 4bits: difference between encoded width and visible width |
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* - lower 4bits: difference between encoded height and visible height |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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#include "libavutil/avstring.h" |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/dict.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/intfloat.h" |
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#include "libavutil/mathematics.h" |
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#include "libavcodec/bytestream.h" |
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#include "libavcodec/mpeg4audio.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "avio_internal.h" |
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#include "flv.h" |
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|
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#define VALIDATE_INDEX_TS_THRESH 2500 |
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|
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typedef struct { |
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const AVClass *class; ///< Class for private options. |
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int trust_metadata; ///< configure streams according onMetaData |
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int wrong_dts; ///< wrong dts due to negative cts |
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uint8_t *new_extradata[FLV_STREAM_TYPE_NB]; |
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int new_extradata_size[FLV_STREAM_TYPE_NB]; |
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int last_sample_rate; |
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int last_channels; |
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struct { |
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int64_t dts; |
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int64_t pos; |
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} validate_index[2]; |
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int validate_next; |
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int validate_count; |
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int searched_for_end; |
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} FLVContext; |
|
|
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static int flv_probe(AVProbeData *p) |
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{ |
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const uint8_t *d; |
|
|
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d = p->buf; |
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if (d[0] == 'F' && |
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d[1] == 'L' && |
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d[2] == 'V' && |
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d[3] < 5 && d[5] == 0 && |
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AV_RB32(d + 5) > 8) { |
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return AVPROBE_SCORE_MAX; |
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} |
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return 0; |
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} |
|
|
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static AVStream *create_stream(AVFormatContext *s, int codec_type) |
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{ |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) |
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return NULL; |
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st->codec->codec_type = codec_type; |
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if (s->nb_streams>=3 ||( s->nb_streams==2 |
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&& s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA |
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&& s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA)) |
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s->ctx_flags &= ~AVFMTCTX_NOHEADER; |
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|
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avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ |
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return st; |
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} |
|
|
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static int flv_same_audio_codec(AVCodecContext *acodec, int flags) |
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{ |
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int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; |
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int flv_codecid = flags & FLV_AUDIO_CODECID_MASK; |
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int codec_id; |
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|
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if (!acodec->codec_id && !acodec->codec_tag) |
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return 1; |
|
|
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if (acodec->bits_per_coded_sample != bits_per_coded_sample) |
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return 0; |
|
|
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switch (flv_codecid) { |
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// no distinction between S16 and S8 PCM codec flags |
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case FLV_CODECID_PCM: |
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codec_id = bits_per_coded_sample == 8 |
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? AV_CODEC_ID_PCM_U8 |
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#if HAVE_BIGENDIAN |
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: AV_CODEC_ID_PCM_S16BE; |
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#else |
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: AV_CODEC_ID_PCM_S16LE; |
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#endif |
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return codec_id == acodec->codec_id; |
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case FLV_CODECID_PCM_LE: |
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codec_id = bits_per_coded_sample == 8 |
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? AV_CODEC_ID_PCM_U8 |
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: AV_CODEC_ID_PCM_S16LE; |
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return codec_id == acodec->codec_id; |
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case FLV_CODECID_AAC: |
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return acodec->codec_id == AV_CODEC_ID_AAC; |
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case FLV_CODECID_ADPCM: |
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return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF; |
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case FLV_CODECID_SPEEX: |
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return acodec->codec_id == AV_CODEC_ID_SPEEX; |
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case FLV_CODECID_MP3: |
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return acodec->codec_id == AV_CODEC_ID_MP3; |
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case FLV_CODECID_NELLYMOSER_8KHZ_MONO: |
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case FLV_CODECID_NELLYMOSER_16KHZ_MONO: |
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case FLV_CODECID_NELLYMOSER: |
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return acodec->codec_id == AV_CODEC_ID_NELLYMOSER; |
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case FLV_CODECID_PCM_MULAW: |
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return acodec->sample_rate == 8000 && |
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acodec->codec_id == AV_CODEC_ID_PCM_MULAW; |
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case FLV_CODECID_PCM_ALAW: |
|
return acodec->sample_rate == 8000 && |
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acodec->codec_id == AV_CODEC_ID_PCM_ALAW; |
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default: |
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return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET); |
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} |
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} |
|
|
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static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, |
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AVCodecContext *acodec, int flv_codecid) |
|
{ |
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switch (flv_codecid) { |
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// no distinction between S16 and S8 PCM codec flags |
|
case FLV_CODECID_PCM: |
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acodec->codec_id = acodec->bits_per_coded_sample == 8 |
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? AV_CODEC_ID_PCM_U8 |
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#if HAVE_BIGENDIAN |
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: AV_CODEC_ID_PCM_S16BE; |
|
#else |
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: AV_CODEC_ID_PCM_S16LE; |
|
#endif |
|
break; |
|
case FLV_CODECID_PCM_LE: |
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acodec->codec_id = acodec->bits_per_coded_sample == 8 |
|
? AV_CODEC_ID_PCM_U8 |
|
: AV_CODEC_ID_PCM_S16LE; |
|
break; |
|
case FLV_CODECID_AAC: |
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acodec->codec_id = AV_CODEC_ID_AAC; |
|
break; |
|
case FLV_CODECID_ADPCM: |
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acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; |
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break; |
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case FLV_CODECID_SPEEX: |
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acodec->codec_id = AV_CODEC_ID_SPEEX; |
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acodec->sample_rate = 16000; |
|
break; |
|
case FLV_CODECID_MP3: |
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acodec->codec_id = AV_CODEC_ID_MP3; |
|
astream->need_parsing = AVSTREAM_PARSE_FULL; |
|
break; |
|
case FLV_CODECID_NELLYMOSER_8KHZ_MONO: |
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// in case metadata does not otherwise declare samplerate |
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acodec->sample_rate = 8000; |
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acodec->codec_id = AV_CODEC_ID_NELLYMOSER; |
|
break; |
|
case FLV_CODECID_NELLYMOSER_16KHZ_MONO: |
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acodec->sample_rate = 16000; |
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acodec->codec_id = AV_CODEC_ID_NELLYMOSER; |
|
break; |
|
case FLV_CODECID_NELLYMOSER: |
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acodec->codec_id = AV_CODEC_ID_NELLYMOSER; |
|
break; |
|
case FLV_CODECID_PCM_MULAW: |
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acodec->sample_rate = 8000; |
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acodec->codec_id = AV_CODEC_ID_PCM_MULAW; |
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break; |
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case FLV_CODECID_PCM_ALAW: |
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acodec->sample_rate = 8000; |
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acodec->codec_id = AV_CODEC_ID_PCM_ALAW; |
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break; |
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default: |
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avpriv_request_sample(s, "Audio codec (%x)", |
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flv_codecid >> FLV_AUDIO_CODECID_OFFSET); |
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acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET; |
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} |
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} |
|
|
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static int flv_same_video_codec(AVCodecContext *vcodec, int flags) |
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{ |
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int flv_codecid = flags & FLV_VIDEO_CODECID_MASK; |
|
|
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if (!vcodec->codec_id && !vcodec->codec_tag) |
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return 1; |
|
|
|
switch (flv_codecid) { |
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case FLV_CODECID_H263: |
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return vcodec->codec_id == AV_CODEC_ID_FLV1; |
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case FLV_CODECID_SCREEN: |
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return vcodec->codec_id == AV_CODEC_ID_FLASHSV; |
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case FLV_CODECID_SCREEN2: |
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return vcodec->codec_id == AV_CODEC_ID_FLASHSV2; |
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case FLV_CODECID_VP6: |
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return vcodec->codec_id == AV_CODEC_ID_VP6F; |
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case FLV_CODECID_VP6A: |
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return vcodec->codec_id == AV_CODEC_ID_VP6A; |
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case FLV_CODECID_H264: |
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return vcodec->codec_id == AV_CODEC_ID_H264; |
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default: |
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return vcodec->codec_tag == flv_codecid; |
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} |
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} |
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|
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static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, |
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int flv_codecid, int read) |
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{ |
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AVCodecContext *vcodec = vstream->codec; |
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switch (flv_codecid) { |
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case FLV_CODECID_H263: |
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vcodec->codec_id = AV_CODEC_ID_FLV1; |
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break; |
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case FLV_CODECID_REALH263: |
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vcodec->codec_id = AV_CODEC_ID_H263; |
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break; // Really mean it this time |
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case FLV_CODECID_SCREEN: |
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vcodec->codec_id = AV_CODEC_ID_FLASHSV; |
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break; |
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case FLV_CODECID_SCREEN2: |
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vcodec->codec_id = AV_CODEC_ID_FLASHSV2; |
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break; |
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case FLV_CODECID_VP6: |
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vcodec->codec_id = AV_CODEC_ID_VP6F; |
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case FLV_CODECID_VP6A: |
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if (flv_codecid == FLV_CODECID_VP6A) |
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vcodec->codec_id = AV_CODEC_ID_VP6A; |
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if (read) { |
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if (vcodec->extradata_size != 1) { |
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ff_alloc_extradata(vcodec, 1); |
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} |
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if (vcodec->extradata) |
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vcodec->extradata[0] = avio_r8(s->pb); |
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else |
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avio_skip(s->pb, 1); |
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} |
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return 1; // 1 byte body size adjustment for flv_read_packet() |
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case FLV_CODECID_H264: |
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vcodec->codec_id = AV_CODEC_ID_H264; |
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vstream->need_parsing = AVSTREAM_PARSE_HEADERS; |
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return 3; // not 4, reading packet type will consume one byte |
|
case FLV_CODECID_MPEG4: |
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vcodec->codec_id = AV_CODEC_ID_MPEG4; |
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return 3; |
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default: |
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avpriv_request_sample(s, "Video codec (%x)", flv_codecid); |
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vcodec->codec_tag = flv_codecid; |
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} |
|
|
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return 0; |
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} |
|
|
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static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) |
|
{ |
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int length = avio_rb16(ioc); |
|
if (length >= buffsize) { |
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avio_skip(ioc, length); |
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return -1; |
|
} |
|
|
|
avio_read(ioc, buffer, length); |
|
|
|
buffer[length] = '\0'; |
|
|
|
return length; |
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} |
|
|
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static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, |
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AVStream *vstream, int64_t max_pos) |
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{ |
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FLVContext *flv = s->priv_data; |
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unsigned int timeslen = 0, fileposlen = 0, i; |
|
char str_val[256]; |
|
int64_t *times = NULL; |
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int64_t *filepositions = NULL; |
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int ret = AVERROR(ENOSYS); |
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int64_t initial_pos = avio_tell(ioc); |
|
|
|
if (vstream->nb_index_entries>0) { |
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av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n"); |
|
return 0; |
|
} |
|
|
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if (s->flags & AVFMT_FLAG_IGNIDX) |
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return 0; |
|
|
|
while (avio_tell(ioc) < max_pos - 2 && |
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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 = × |
|
timeslen = arraylen; |
|
} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && |
|
!filepositions) { |
|
current_array = &filepositions; |
|
fileposlen = arraylen; |
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} 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++) { |
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if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER) |
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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++) { |
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av_add_index_entry(vstream, filepositions[i], times[i] * 1000, |
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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(×); |
|
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[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 && |
|
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) |
|
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; |
|
} |
|
|
|
// only look for metadata values when we are not nested and key != NULL |
|
if (depth == 1 && key) { |
|
acodec = astream ? astream->codec : NULL; |
|
vcodec = vstream ? vstream->codec : NULL; |
|
|
|
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_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) { |
|
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_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; |
|
|
|
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; |
|
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[11]; |
|
|
|
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 -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_VIDEO) |
|
vstream = stream; |
|
else if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) |
|
astream = stream; |
|
else if (stream->codec->codec_type == AVMEDIA_TYPE_DATA) |
|
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); |
|
/* 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); |
|
// 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_free(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 + |
|
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 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; |
|
|
|
switch (avio_r8(pb)) { |
|
case AMF_DATA_TYPE_MIXEDARRAY: |
|
avio_seek(pb, 4, SEEK_CUR); |
|
case AMF_DATA_TYPE_OBJECT: |
|
break; |
|
default: |
|
goto skip; |
|
} |
|
|
|
while ((ret = amf_get_string(pb, buf, sizeof(buf))) > 0) { |
|
AMFDataType type = avio_r8(pb); |
|
if (type == AMF_DATA_TYPE_STRING && !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_DATA) |
|
break; |
|
} |
|
|
|
if (i == s->nb_streams) { |
|
st = create_stream(s, AVMEDIA_TYPE_DATA); |
|
if (!st) |
|
return AVERROR_INVALIDDATA; |
|
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 flv_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
FLVContext *flv = s->priv_data; |
|
int ret, i, type, size, flags; |
|
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; |
|
|
|
/* pkt size is repeated at end. skip it */ |
|
for (;; avio_skip(s->pb, 4)) { |
|
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" pos:%"PRId64"\n", type, size, dts, avio_tell(s->pb)); |
|
if (url_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) |
|
continue; |
|
|
|
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 && dts == 0) { // Header-type metadata stuff |
|
meta_pos = avio_tell(s->pb); |
|
if (flv_read_metabody(s, next) == 0) { |
|
goto skip; |
|
} |
|
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); |
|
continue; |
|
} |
|
|
|
/* skip empty data packets */ |
|
if (!size) |
|
continue; |
|
|
|
/* 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_DATA) |
|
break; |
|
} |
|
} |
|
if (i == s->nb_streams) { |
|
static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA}; |
|
av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n"); |
|
st = create_stream(s, stream_types[stream_type]); |
|
if (!st) |
|
return AVERROR(ENOMEM); |
|
|
|
} |
|
av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard); |
|
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); |
|
continue; |
|
} |
|
if ((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); |
|
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) && !flv->searched_for_end) { |
|
int size; |
|
const int64_t pos = avio_tell(s->pb); |
|
int64_t fsize = avio_size(s->pb); |
|
retry_duration: |
|
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; |
|
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; |
|
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); |
|
} |
|
|
|
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 are wrong |
|
flv->wrong_dts = 1; |
|
av_log(s, AV_LOG_WARNING, |
|
"negative cts, previous timestamps might be wrong\n"); |
|
} 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 (flv->wrong_dts) |
|
dts = AV_NOPTS_VALUE; |
|
} |
|
if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC)) { |
|
AVDictionaryEntry *t; |
|
|
|
if (st->codec->extradata) { |
|
if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0) |
|
return ret; |
|
ret = AVERROR(EAGAIN); |
|
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_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 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: |
|
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 to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .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, |
|
};
|
|
|