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ffmpeg / libavformat / flvenc.c @ f23496b5

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/*
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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 "avformat.h"
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#include "flv.h"
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#include "riff.h"
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#include "avc.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_FLASHSV, FLV_CODECID_SCREEN},
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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_S8,    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_NONE,      0}
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};
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typedef struct FLVContext {
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    int reserved;
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    offset_t duration_offset;
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    offset_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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} FLVContext;
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static int get_audio_flags(AVCodecContext *enc){
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    int flags = (enc->bits_per_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 {
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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_S8:
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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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        flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
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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(ByteIOContext *pb, const char *str)
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{
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    size_t len = strlen(str);
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    put_be16(pb, len);
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    put_buffer(pb, str, len);
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}
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static void put_amf_double(ByteIOContext *pb, double d)
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{
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    put_byte(pb, AMF_DATA_TYPE_NUMBER);
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    put_be64(pb, av_dbl2int(d));
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}
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static void put_amf_bool(ByteIOContext *pb, int b) {
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    put_byte(pb, AMF_DATA_TYPE_BOOL);
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    put_byte(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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    ByteIOContext *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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    int metadata_size_pos, data_size;
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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 == CODEC_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 {
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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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    put_tag(pb,"FLV");
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    put_byte(pb,1);
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    put_byte(pb,   FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
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                 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
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    put_be32(pb,9);
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    put_be32(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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            put_byte(pb,8); // message type
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            put_be24(pb,0); // include flags
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            put_be24(pb,0); // time stamp
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            put_be32(pb,0); // reserved
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            put_be32(pb,11); // size
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            flv->reserved=5;
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        }
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    }
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    /* write meta_tag */
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    put_byte(pb, 18);         // tag type META
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    metadata_size_pos= url_ftell(pb);
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    put_be24(pb, 0);          // size of data part (sum of all parts below)
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    put_be24(pb, 0);          // time stamp
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    put_be32(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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    put_byte(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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    put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY);
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    put_be32(pb, 5*!!video_enc + 4*!!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= url_ftell(pb);
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    put_amf_double(pb, 0); // delayed write
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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, s->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, "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_S8 ? 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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    put_amf_string(pb, "filesize");
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    flv->filesize_offset= url_ftell(pb);
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    put_amf_double(pb, 0); // delayed write
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    put_amf_string(pb, "");
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    put_byte(pb, AMF_END_OF_OBJECT);
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    /* write total size of tag */
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    data_size= url_ftell(pb) - metadata_size_pos - 10;
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    url_fseek(pb, metadata_size_pos, SEEK_SET);
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    put_be24(pb, data_size);
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    url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
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    put_be32(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) {
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            offset_t pos;
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            put_byte(pb, enc->codec_type == CODEC_TYPE_VIDEO ?
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                     FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
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            put_be24(pb, 0); // size patched later
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            put_be24(pb, 0); // ts
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            put_byte(pb, 0); // ts ext
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            put_be24(pb, 0); // streamid
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            pos = url_ftell(pb);
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            if (enc->codec_id == CODEC_ID_AAC) {
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                put_byte(pb, get_audio_flags(enc));
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                put_byte(pb, 0); // AAC sequence header
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                put_buffer(pb, enc->extradata, enc->extradata_size);
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            } else {
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                put_byte(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
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                put_byte(pb, 0); // AVC sequence header
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                put_be24(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 = url_ftell(pb) - pos;
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            url_fseek(pb, -data_size - 10, SEEK_CUR);
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            put_be24(pb, data_size);
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            url_fseek(pb, data_size + 10 - 3, SEEK_CUR);
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            put_be32(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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    ByteIOContext *pb = s->pb;
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    FLVContext *flv = s->priv_data;
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    file_size = url_ftell(pb);
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    /* update informations */
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    url_fseek(pb, flv->duration_offset, SEEK_SET);
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    put_amf_double(pb, flv->duration / (double)1000);
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    url_fseek(pb, flv->filesize_offset, SEEK_SET);
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    put_amf_double(pb, file_size);
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    url_fseek(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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    ByteIOContext *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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    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)
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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 == CODEC_TYPE_VIDEO) {
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        put_byte(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 %X not compatible with flv\n",enc->codec_id);
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            return -1;
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        }
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        flags |= pkt->flags & PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
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    } else {
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        assert(enc->codec_type == CODEC_TYPE_AUDIO);
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        flags = get_audio_flags(enc);
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        assert(size);
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        put_byte(pb, FLV_TAG_TYPE_AUDIO);
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    }
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    if (enc->codec_id == CODEC_ID_H264) {
340
        if (ff_avc_parse_nal_units(pkt->data, &pkt->data, &pkt->size) < 0)
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            return -1;
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        assert(pkt->size);
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        size = pkt->size;
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        /* cast needed to get negative value */
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        if (!flv->delay && (int32_t)pkt->dts < 0)
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            flv->delay = -(int32_t)pkt->dts;
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    }
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    ts = pkt->dts + flv->delay; // add delay to force positive dts
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    put_be24(pb,size + flags_size);
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    put_be24(pb,ts);
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    put_byte(pb,ts >> 24);
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    put_be24(pb,flv->reserved);
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    put_byte(pb,flags);
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    if (enc->codec_id == CODEC_ID_VP6)
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        put_byte(pb,0);
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    if (enc->codec_id == CODEC_ID_VP6F)
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        put_byte(pb, enc->extradata_size ? enc->extradata[0] : 0);
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    else if (enc->codec_id == CODEC_ID_AAC)
360
        put_byte(pb,1); // AAC raw
361
    else if (enc->codec_id == CODEC_ID_H264) {
362
        put_byte(pb,1); // AVC NALU
363
        put_be24(pb,pkt->pts - (int32_t)pkt->dts);
364
    }
365
    put_buffer(pb, pkt->data, size);
366
    put_be32(pb,size+flags_size+11); // previous tag size
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    flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
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369
    put_flush_packet(pb);
370
    return 0;
371
}
372

    
373
AVOutputFormat flv_muxer = {
374
    "flv",
375
    "flv format",
376
    "video/x-flv",
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    "flv",
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    sizeof(FLVContext),
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#ifdef CONFIG_LIBMP3LAME
380
    CODEC_ID_MP3,
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#else // CONFIG_LIBMP3LAME
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    CODEC_ID_ADPCM_SWF,
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#endif // CONFIG_LIBMP3LAME
384
    CODEC_ID_FLV1,
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    flv_write_header,
386
    flv_write_packet,
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    flv_write_trailer,
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    .codec_tag= (const AVCodecTag*[]){flv_video_codec_ids, flv_audio_codec_ids, 0},
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    .flags= AVFMT_GLOBALHEADER,
390
};