mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-12-05 01:56:41 +00:00
ee0dadc109
New streams may be created at any time, e.g. on codec change.
885 lines
30 KiB
C
885 lines
30 KiB
C
/*
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* FLV demuxer
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* Copyright (c) 2003 The Libav 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/avstring.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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#define KEYFRAMES_TAG "keyframes"
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#define KEYFRAMES_TIMESTAMP_TAG "times"
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#define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
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#define VALIDATE_INDEX_TS_THRESH 2500
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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[2];
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int new_extradata_size[2];
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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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} 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' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && 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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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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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 ? 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 ? AV_CODEC_ID_PCM_U8 : 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:
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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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return 0;
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}
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static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, 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
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case FLV_CODECID_PCM:
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acodec->codec_id = acodec->bits_per_coded_sample == 8 ? 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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break;
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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;
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case FLV_CODECID_AAC : acodec->codec_id = AV_CODEC_ID_AAC; break;
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case FLV_CODECID_ADPCM: acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; 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;
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break;
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case FLV_CODECID_MP3 : acodec->codec_id = AV_CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
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case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
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acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
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acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
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break;
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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;
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break;
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case FLV_CODECID_NELLYMOSER:
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acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
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break;
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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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av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", 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;
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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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return 0;
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}
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static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
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AVCodecContext *vcodec = vstream->codec;
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switch(flv_codecid) {
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case FLV_CODECID_H263 : vcodec->codec_id = AV_CODEC_ID_FLV1 ; break;
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case FLV_CODECID_SCREEN: vcodec->codec_id = AV_CODEC_ID_FLASHSV; break;
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case FLV_CODECID_SCREEN2: vcodec->codec_id = AV_CODEC_ID_FLASHSV2; break;
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case FLV_CODECID_VP6 : 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(vcodec->extradata_size != 1) {
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vcodec->extradata_size = 1;
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vcodec->extradata = av_malloc(1);
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}
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vcodec->extradata[0] = avio_r8(s->pb);
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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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return 3; // not 4, reading packet type will consume one byte
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default:
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av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", 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);
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if(length >= buffsize) {
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avio_skip(ioc, length);
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return -1;
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}
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avio_read(ioc, buffer, length);
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buffer[length] = '\0';
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return length;
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}
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static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
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FLVContext *flv = s->priv_data;
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unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i;
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double num_val;
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char str_val[256];
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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);
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if (s->flags & AVFMT_FLAG_IGNIDX)
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return 0;
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while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
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int64_t* current_array;
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// Expect array object in context
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if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
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break;
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arraylen = avio_rb32(ioc);
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if (arraylen >> 28)
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break;
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/*
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* Expect only 'times' or 'filepositions' sub-arrays in other case refuse to use such metadata
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* for indexing
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*/
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if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
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if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
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ret = AVERROR(ENOMEM);
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goto finish;
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}
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timeslen = arraylen;
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current_array = times;
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} else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions) {
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if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
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ret = AVERROR(ENOMEM);
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goto finish;
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}
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fileposlen = arraylen;
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current_array = filepositions;
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} else // unexpected metatag inside keyframes, will not use such metadata for indexing
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break;
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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 finish;
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num_val = av_int2double(avio_rb64(ioc));
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current_array[i] = num_val;
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}
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if (times && filepositions) {
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// All done, exiting at a position allowing amf_parse_object
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// to finish parsing the object
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ret = 0;
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break;
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}
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}
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if (!ret && timeslen == fileposlen) {
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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);
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if (i < 2) {
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flv->validate_index[i].pos = filepositions[i];
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flv->validate_index[i].dts = times[i] * 1000;
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flv->validate_count = i + 1;
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}
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}
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} else
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av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
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finish:
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av_freep(×);
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av_freep(&filepositions);
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// If we got unexpected data, but successfully reset back to
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// the start pos, the caller can continue parsing
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if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0)
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return 0;
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return ret;
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}
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static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
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AVCodecContext *acodec, *vcodec;
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FLVContext *flv = s->priv_data;
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AVIOContext *ioc;
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AMFDataType amf_type;
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char str_val[256];
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double num_val;
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num_val = 0;
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ioc = s->pb;
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amf_type = avio_r8(ioc);
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switch(amf_type) {
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case AMF_DATA_TYPE_NUMBER:
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num_val = av_int2double(avio_rb64(ioc)); break;
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case AMF_DATA_TYPE_BOOL:
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num_val = avio_r8(ioc); break;
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case AMF_DATA_TYPE_STRING:
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if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
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return -1;
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break;
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case AMF_DATA_TYPE_OBJECT:
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if ((vstream || astream) && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
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if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
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max_pos) < 0)
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return -1;
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while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
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if (amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
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return -1; //if we couldn't skip, bomb out.
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}
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if(avio_r8(ioc) != AMF_END_OF_OBJECT)
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return -1;
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break;
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case AMF_DATA_TYPE_NULL:
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case AMF_DATA_TYPE_UNDEFINED:
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case AMF_DATA_TYPE_UNSUPPORTED:
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break; //these take up no additional space
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case AMF_DATA_TYPE_MIXEDARRAY:
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avio_skip(ioc, 4); //skip 32-bit max array index
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while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
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//this is the only case in which we would want a nested parse to not skip over the object
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if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
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return -1;
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}
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if(avio_r8(ioc) != AMF_END_OF_OBJECT)
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return -1;
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break;
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case AMF_DATA_TYPE_ARRAY: {
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unsigned int arraylen, i;
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arraylen = avio_rb32(ioc);
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for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
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if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
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return -1; //if we couldn't skip, bomb out.
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}
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}
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break;
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case AMF_DATA_TYPE_DATE:
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avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
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break;
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default: //unsupported type, we couldn't skip
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return -1;
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}
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if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
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acodec = astream ? astream->codec : NULL;
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vcodec = vstream ? vstream->codec : NULL;
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if (amf_type == AMF_DATA_TYPE_NUMBER) {
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if (!strcmp(key, "duration"))
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s->duration = num_val * AV_TIME_BASE;
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else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
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vcodec->bit_rate = num_val * 1024.0;
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else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
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acodec->bit_rate = num_val * 1024.0;
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else if (!strcmp(key, "datastream")) {
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AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_id = AV_CODEC_ID_TEXT;
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} else if (flv->trust_metadata) {
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if (!strcmp(key, "videocodecid") && vcodec) {
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flv_set_video_codec(s, vstream, num_val);
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} else
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if (!strcmp(key, "audiocodecid") && acodec) {
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flv_set_audio_codec(s, astream, acodec, num_val);
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} else
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if (!strcmp(key, "audiosamplerate") && acodec) {
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acodec->sample_rate = num_val;
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} else
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if (!strcmp(key, "width") && vcodec) {
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vcodec->width = num_val;
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} else
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if (!strcmp(key, "height") && vcodec) {
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vcodec->height = num_val;
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}
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}
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}
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if (!strcmp(key, "duration") ||
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|
!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->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);
|
|
}
|
|
|
|
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;
|
|
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,
|
|
};
|