mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
476 lines
16 KiB
C
476 lines
16 KiB
C
/*
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* FLV muxer
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* Copyright (c) 2003 The FFmpeg Project
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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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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "avformat.h"
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#include "flv.h"
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#include "internal.h"
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#include "avc.h"
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#include "metadata.h"
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#include "libavutil/dict.h"
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#undef NDEBUG
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#include <assert.h>
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static const AVCodecTag flv_video_codec_ids[] = {
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{CODEC_ID_FLV1, FLV_CODECID_H263 },
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{CODEC_ID_H263, FLV_CODECID_REALH263},
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{CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
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{CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
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{CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
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{CODEC_ID_VP6F, FLV_CODECID_VP6 },
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{CODEC_ID_VP6, FLV_CODECID_VP6 },
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{CODEC_ID_H264, FLV_CODECID_H264 },
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{CODEC_ID_NONE, 0}
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};
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static const AVCodecTag flv_audio_codec_ids[] = {
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{CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
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{CODEC_ID_NONE, 0}
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};
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typedef struct FLVContext {
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int reserved;
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int64_t duration_offset;
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int64_t filesize_offset;
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int64_t duration;
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int delay; ///< first dts delay for AVC
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int64_t last_video_ts;
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} FLVContext;
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static int get_audio_flags(AVCodecContext *enc){
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int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
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if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters
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return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
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else if (enc->codec_id == CODEC_ID_SPEEX) {
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if (enc->sample_rate != 16000) {
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av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
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return -1;
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}
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if (enc->channels != 1) {
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av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
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return -1;
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}
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if (enc->frame_size / 320 > 8) {
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av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
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"8 frames per packet. Adobe Flash "
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"Player cannot handle this!\n");
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}
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return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
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} else {
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switch (enc->sample_rate) {
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case 44100:
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flags |= FLV_SAMPLERATE_44100HZ;
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break;
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case 22050:
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flags |= FLV_SAMPLERATE_22050HZ;
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break;
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case 11025:
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flags |= FLV_SAMPLERATE_11025HZ;
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break;
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case 8000: //nellymoser only
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case 5512: //not mp3
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if(enc->codec_id != CODEC_ID_MP3){
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flags |= FLV_SAMPLERATE_SPECIAL;
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break;
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}
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default:
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av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
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return -1;
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}
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}
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if (enc->channels > 1) {
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flags |= FLV_STEREO;
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}
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switch(enc->codec_id){
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case CODEC_ID_MP3:
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flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
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break;
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case CODEC_ID_PCM_U8:
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flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
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break;
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case CODEC_ID_PCM_S16BE:
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flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
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break;
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case CODEC_ID_PCM_S16LE:
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flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
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break;
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case CODEC_ID_ADPCM_SWF:
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flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
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break;
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case CODEC_ID_NELLYMOSER:
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if (enc->sample_rate == 8000) {
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flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
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} else {
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flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
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}
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break;
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case 0:
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flags |= enc->codec_tag<<4;
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break;
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default:
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av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
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return -1;
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}
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return flags;
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}
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static void put_amf_string(AVIOContext *pb, const char *str)
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{
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size_t len = strlen(str);
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avio_wb16(pb, len);
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avio_write(pb, str, len);
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}
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static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
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avio_w8(pb, FLV_TAG_TYPE_VIDEO);
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avio_wb24(pb, 5); /* Tag Data Size */
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avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms*/
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avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms*/
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avio_wb24(pb, 0); /* StreamId = 0 */
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avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
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avio_w8(pb, 2); /* AVC end of sequence */
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avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
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avio_wb32(pb, 16); /* Size of FLV tag */
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}
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static void put_amf_double(AVIOContext *pb, double d)
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{
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avio_w8(pb, AMF_DATA_TYPE_NUMBER);
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avio_wb64(pb, av_dbl2int(d));
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}
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static void put_amf_bool(AVIOContext *pb, int b) {
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avio_w8(pb, AMF_DATA_TYPE_BOOL);
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avio_w8(pb, !!b);
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}
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static int flv_write_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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AVCodecContext *audio_enc = NULL, *video_enc = NULL;
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int i;
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double framerate = 0.0;
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int64_t metadata_size_pos, data_size;
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AVDictionaryEntry *tag = NULL;
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for(i=0; i<s->nb_streams; i++){
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AVCodecContext *enc = s->streams[i]->codec;
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if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
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if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
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framerate = av_q2d(s->streams[i]->r_frame_rate);
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} else {
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framerate = 1/av_q2d(s->streams[i]->codec->time_base);
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}
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video_enc = enc;
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if(enc->codec_tag == 0) {
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av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
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return -1;
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}
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} else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
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audio_enc = enc;
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if(get_audio_flags(enc)<0)
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return -1;
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}
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av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
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}
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avio_write(pb, "FLV", 3);
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avio_w8(pb,1);
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avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
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+ FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
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avio_wb32(pb,9);
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avio_wb32(pb,0);
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for(i=0; i<s->nb_streams; i++){
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if(s->streams[i]->codec->codec_tag == 5){
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avio_w8(pb,8); // message type
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avio_wb24(pb,0); // include flags
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avio_wb24(pb,0); // time stamp
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avio_wb32(pb,0); // reserved
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avio_wb32(pb,11); // size
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flv->reserved=5;
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}
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}
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flv->last_video_ts = -1;
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/* write meta_tag */
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avio_w8(pb, 18); // tag type META
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metadata_size_pos= avio_tell(pb);
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avio_wb24(pb, 0); // size of data part (sum of all parts below)
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avio_wb24(pb, 0); // time stamp
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avio_wb32(pb, 0); // reserved
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/* now data of data_size size */
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/* first event name as a string */
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avio_w8(pb, AMF_DATA_TYPE_STRING);
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put_amf_string(pb, "onMetaData"); // 12 bytes
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/* mixed array (hash) with size and string/type/data tuples */
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avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
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avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size
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put_amf_string(pb, "duration");
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flv->duration_offset= avio_tell(pb);
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put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect
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if(video_enc){
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put_amf_string(pb, "width");
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put_amf_double(pb, video_enc->width);
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put_amf_string(pb, "height");
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put_amf_double(pb, video_enc->height);
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put_amf_string(pb, "videodatarate");
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put_amf_double(pb, video_enc->bit_rate / 1024.0);
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put_amf_string(pb, "framerate");
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put_amf_double(pb, framerate);
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put_amf_string(pb, "videocodecid");
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put_amf_double(pb, video_enc->codec_tag);
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}
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if(audio_enc){
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put_amf_string(pb, "audiodatarate");
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put_amf_double(pb, audio_enc->bit_rate / 1024.0);
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put_amf_string(pb, "audiosamplerate");
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put_amf_double(pb, audio_enc->sample_rate);
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put_amf_string(pb, "audiosamplesize");
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put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
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put_amf_string(pb, "stereo");
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put_amf_bool(pb, audio_enc->channels == 2);
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put_amf_string(pb, "audiocodecid");
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put_amf_double(pb, audio_enc->codec_tag);
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}
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while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
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put_amf_string(pb, tag->key);
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avio_w8(pb, AMF_DATA_TYPE_STRING);
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put_amf_string(pb, tag->value);
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}
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put_amf_string(pb, "filesize");
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flv->filesize_offset= avio_tell(pb);
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put_amf_double(pb, 0); // delayed write
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put_amf_string(pb, "");
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avio_w8(pb, AMF_END_OF_OBJECT);
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/* write total size of tag */
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data_size= avio_tell(pb) - metadata_size_pos - 10;
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avio_seek(pb, metadata_size_pos, SEEK_SET);
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avio_wb24(pb, data_size);
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avio_skip(pb, data_size + 10 - 3);
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avio_wb32(pb, data_size + 11);
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for (i = 0; i < s->nb_streams; i++) {
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AVCodecContext *enc = s->streams[i]->codec;
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if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
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int64_t pos;
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avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
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FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
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avio_wb24(pb, 0); // size patched later
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avio_wb24(pb, 0); // ts
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avio_w8(pb, 0); // ts ext
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avio_wb24(pb, 0); // streamid
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pos = avio_tell(pb);
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if (enc->codec_id == CODEC_ID_AAC) {
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avio_w8(pb, get_audio_flags(enc));
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avio_w8(pb, 0); // AAC sequence header
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avio_write(pb, enc->extradata, enc->extradata_size);
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} else {
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avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
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avio_w8(pb, 0); // AVC sequence header
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avio_wb24(pb, 0); // composition time
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ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
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}
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data_size = avio_tell(pb) - pos;
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avio_seek(pb, -data_size - 10, SEEK_CUR);
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avio_wb24(pb, data_size);
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avio_skip(pb, data_size + 10 - 3);
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avio_wb32(pb, data_size + 11); // previous tag size
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}
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}
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return 0;
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}
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static int flv_write_trailer(AVFormatContext *s)
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{
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int64_t file_size;
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AVIOContext *pb = s->pb;
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FLVContext *flv = s->priv_data;
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int i;
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/* Add EOS tag */
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for (i = 0; i < s->nb_streams; i++) {
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AVCodecContext *enc = s->streams[i]->codec;
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if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
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(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)) {
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put_avc_eos_tag(pb, flv->last_video_ts);
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}
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}
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file_size = avio_tell(pb);
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/* update informations */
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avio_seek(pb, flv->duration_offset, SEEK_SET);
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put_amf_double(pb, flv->duration / (double)1000);
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avio_seek(pb, flv->filesize_offset, SEEK_SET);
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put_amf_double(pb, file_size);
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avio_seek(pb, file_size, SEEK_SET);
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return 0;
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}
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static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
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FLVContext *flv = s->priv_data;
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unsigned ts;
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int size= pkt->size;
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uint8_t *data= NULL;
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int flags, flags_size;
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// av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size);
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if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
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enc->codec_id == CODEC_ID_AAC)
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flags_size= 2;
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else if(enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4)
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flags_size= 5;
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else
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flags_size= 1;
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if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
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avio_w8(pb, FLV_TAG_TYPE_VIDEO);
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flags = enc->codec_tag;
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if(flags == 0) {
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av_log(enc, AV_LOG_ERROR, "video codec %s not compatible with flv\n", avcodec_get_name(enc->codec_id));
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return -1;
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}
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flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
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} else if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
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flags = get_audio_flags(enc);
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assert(size);
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avio_w8(pb, FLV_TAG_TYPE_AUDIO);
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} else {
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// In-band flv metadata ("scriptdata")
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assert(enc->codec_type == AVMEDIA_TYPE_DATA);
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avio_w8(pb, FLV_TAG_TYPE_META);
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flags_size = 0;
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flags = NULL;
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}
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if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
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/* check if extradata looks like mp4 formated */
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if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
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if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
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return -1;
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}
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if (!flv->delay && pkt->dts < 0)
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flv->delay = -pkt->dts;
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} else if (enc->codec_id == CODEC_ID_AAC && pkt->size > 2 &&
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(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
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av_log(s, AV_LOG_ERROR, "malformated aac bitstream, use -absf aac_adtstoasc\n");
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return -1;
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}
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ts = pkt->dts + flv->delay; // add delay to force positive dts
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if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
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if (flv->last_video_ts < ts)
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flv->last_video_ts = ts;
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}
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avio_wb24(pb,size + flags_size);
|
|
avio_wb24(pb,ts);
|
|
avio_w8(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_
|
|
avio_wb24(pb,flv->reserved);
|
|
|
|
if(flags_size)
|
|
avio_w8(pb,flags);
|
|
|
|
if (enc->codec_id == CODEC_ID_VP6)
|
|
avio_w8(pb,0);
|
|
if (enc->codec_id == CODEC_ID_VP6F)
|
|
avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
|
|
else if (enc->codec_id == CODEC_ID_AAC)
|
|
avio_w8(pb,1); // AAC raw
|
|
else if (enc->codec_id == CODEC_ID_H264 || enc->codec_id == CODEC_ID_MPEG4) {
|
|
avio_w8(pb,1); // AVC NALU
|
|
avio_wb24(pb,pkt->pts - pkt->dts);
|
|
}
|
|
|
|
avio_write(pb, data ? data : pkt->data, size);
|
|
|
|
avio_wb32(pb,size+flags_size+11); // previous tag size
|
|
flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
|
|
|
|
avio_flush(pb);
|
|
|
|
av_free(data);
|
|
|
|
return pb->error;
|
|
}
|
|
|
|
AVOutputFormat ff_flv_muxer = {
|
|
.name = "flv",
|
|
.long_name = NULL_IF_CONFIG_SMALL("FLV format"),
|
|
.mime_type = "video/x-flv",
|
|
.extensions = "flv",
|
|
.priv_data_size = sizeof(FLVContext),
|
|
#if CONFIG_LIBMP3LAME
|
|
.audio_codec = CODEC_ID_MP3,
|
|
#else // CONFIG_LIBMP3LAME
|
|
.audio_codec = CODEC_ID_ADPCM_SWF,
|
|
#endif // CONFIG_LIBMP3LAME
|
|
.video_codec = CODEC_ID_FLV1,
|
|
.write_header = flv_write_header,
|
|
.write_packet = flv_write_packet,
|
|
.write_trailer = flv_write_trailer,
|
|
.codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
|
|
.flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
|
|
};
|