flvenc.c 21.7 KB
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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.
 *
 * 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
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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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/dict.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/avassert.h"
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#include "avc.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 "metadata.h"
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static const AVCodecTag flv_video_codec_ids[] = {
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    { AV_CODEC_ID_FLV1,     FLV_CODECID_H263 },
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    { AV_CODEC_ID_H263,     FLV_CODECID_REALH263 },
    { AV_CODEC_ID_MPEG4,    FLV_CODECID_MPEG4 },
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    { AV_CODEC_ID_FLASHSV,  FLV_CODECID_SCREEN },
    { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
    { AV_CODEC_ID_VP6F,     FLV_CODECID_VP6 },
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    { AV_CODEC_ID_VP6,      FLV_CODECID_VP6 },
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    { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
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    { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
    { AV_CODEC_ID_NONE,     0 }
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};

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static const AVCodecTag flv_audio_codec_ids[] = {
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    { AV_CODEC_ID_MP3,        FLV_CODECID_MP3        >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_PCM_U8,     FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_PCM_S16BE,  FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_PCM_S16LE,  FLV_CODECID_PCM_LE     >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_ADPCM_SWF,  FLV_CODECID_ADPCM      >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_AAC,        FLV_CODECID_AAC        >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_PCM_MULAW,  FLV_CODECID_PCM_MULAW  >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_PCM_ALAW,   FLV_CODECID_PCM_ALAW   >> FLV_AUDIO_CODECID_OFFSET },
    { AV_CODEC_ID_SPEEX,      FLV_CODECID_SPEEX      >> FLV_AUDIO_CODECID_OFFSET },
    { AV_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;
    int64_t filesize_offset;
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    int64_t duration;
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    int64_t delay;      ///< first dts delay (needed for AVC & Speex)
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} FLVContext;

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typedef struct FLVStreamContext {
    int64_t last_ts;    ///< last timestamp for each stream
} FLVStreamContext;

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static int get_audio_flags(AVFormatContext *s, 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 == AV_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 == AV_CODEC_ID_SPEEX) {
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        if (enc->sample_rate != 16000) {
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            av_log(s, AV_LOG_ERROR,
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                   "FLV only supports wideband (16kHz) Speex audio\n");
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            return AVERROR(EINVAL);
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        }
        if (enc->channels != 1) {
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            av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
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            return AVERROR(EINVAL);
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        }
        return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
    } else {
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        switch (enc->sample_rate) {
        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 16000: // nellymoser only
        case  8000: // nellymoser only
        case  5512: // not MP3
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            if (enc->codec_id != AV_CODEC_ID_MP3) {
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                flags |= FLV_SAMPLERATE_SPECIAL;
                break;
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            }
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        default:
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            av_log(s, AV_LOG_ERROR,
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                   "FLV does not support sample rate %d, "
                   "choose from (44100, 22050, 11025)\n", enc->sample_rate);
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            return AVERROR(EINVAL);
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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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    switch (enc->codec_id) {
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    case AV_CODEC_ID_MP3:
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        flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case AV_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 AV_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 AV_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 AV_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 AV_CODEC_ID_NELLYMOSER:
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        if (enc->sample_rate == 8000)
            flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO  | FLV_SAMPLESSIZE_16BIT;
        else if (enc->sample_rate == 16000)
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            flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
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        else
            flags |= FLV_CODECID_NELLYMOSER            | FLV_SAMPLESSIZE_16BIT;
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        break;
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    case AV_CODEC_ID_PCM_MULAW:
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        flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
        break;
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    case AV_CODEC_ID_PCM_ALAW:
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        flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL | 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;
    default:
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        av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
               avcodec_get_name(enc->codec_id));
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        return AVERROR(EINVAL);
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    }
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    return flags;
}

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static void put_amf_string(AVIOContext *pb, const char *str)
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{
    size_t len = strlen(str);
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    avio_wb16(pb, len);
    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 */
    avio_wb24(pb, ts);              /* lower 24 bits of timestamp in ms */
    avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
    avio_wb24(pb, 0);               /* StreamId = 0 */
    avio_w8(pb, 23);                /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
    avio_w8(pb, 2);                 /* AVC end of sequence */
    avio_wb24(pb, 0);               /* Always 0 for AVC EOS. */
    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_double2int(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);
    avio_w8(pb, !!b);
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}

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static int flv_write_header(AVFormatContext *s)
{
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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, *data_enc = NULL;
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    int i, metadata_count = 0;
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    double framerate = 0.0;
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    int64_t metadata_size_pos, data_size, metadata_count_pos;
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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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        FLVStreamContext *sc;
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        switch (enc->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
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            if (s->streams[i]->avg_frame_rate.den &&
                s->streams[i]->avg_frame_rate.num) {
                framerate = av_q2d(s->streams[i]->avg_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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            if (video_enc) {
                av_log(s, AV_LOG_ERROR,
                       "at most one video stream is supported in flv\n");
                return AVERROR(EINVAL);
            }
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            video_enc = enc;
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            if (enc->codec_tag == 0) {
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                av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",
                       avcodec_get_name(enc->codec_id), i);
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                return AVERROR(EINVAL);
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            }
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            break;
        case AVMEDIA_TYPE_AUDIO:
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            if (audio_enc) {
                av_log(s, AV_LOG_ERROR,
                       "at most one audio stream is supported in flv\n");
                return AVERROR(EINVAL);
            }
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            audio_enc = enc;
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            if (get_audio_flags(s, enc) < 0)
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                return AVERROR_INVALIDDATA;
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            if (enc->codec_id == AV_CODEC_ID_PCM_S16BE)
                av_log(s, AV_LOG_WARNING,
                       "16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
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            break;
        case AVMEDIA_TYPE_DATA:
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            if (enc->codec_id != AV_CODEC_ID_TEXT) {
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                av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",
                       avcodec_get_name(enc->codec_id), i);
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                return AVERROR_INVALIDDATA;
            }
            data_enc = enc;
            break;
        default:
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            av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
                   av_get_media_type_string(enc->codec_type), i);
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            return AVERROR(EINVAL);
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        }
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        avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
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        sc = av_mallocz(sizeof(FLVStreamContext));
        if (!sc)
            return AVERROR(ENOMEM);
        s->streams[i]->priv_data = sc;
        sc->last_ts = -1;
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    }
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    flv->delay = AV_NOPTS_VALUE;

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    avio_write(pb, "FLV", 3);
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    avio_w8(pb, 1);
    avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
                FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
    avio_wb32(pb, 9);
    avio_wb32(pb, 0);

    for (i = 0; i < s->nb_streams; i++)
        if (s->streams[i]->codec->codec_tag == 5) {
            avio_w8(pb, 8);     // message type
            avio_wb24(pb, 0);   // include flags
            avio_wb24(pb, 0);   // time stamp
            avio_wb32(pb, 0);   // reserved
            avio_wb32(pb, 11);  // size
            flv->reserved = 5;
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        }
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    /* write meta_tag */
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    avio_w8(pb, 18);            // tag type META
    metadata_size_pos = avio_tell(pb);
    avio_wb24(pb, 0);           // size of data part (sum of all parts below)
    avio_wb24(pb, 0);           // timestamp
    avio_wb32(pb, 0);           // reserved
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    /* now data of data_size size */

    /* 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

    /* 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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    metadata_count_pos = avio_tell(pb);
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    metadata_count = 5 * !!video_enc +
                     5 * !!audio_enc +
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                     1 * !!data_enc  +
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                     2; // +2 for duration and file size

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    avio_wb32(pb, metadata_count);
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    put_amf_string(pb, "duration");
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    flv->duration_offset= avio_tell(pb);
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    // fill in the guessed duration, it'll be corrected later if incorrect
    put_amf_double(pb, s->duration / AV_TIME_BASE);

    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");
        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");
        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 == AV_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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    if (data_enc) {
        put_amf_string(pb, "datastream");
        put_amf_double(pb, 0.0);
    }

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    while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
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        if(   !strcmp(tag->key, "width")
            ||!strcmp(tag->key, "height")
            ||!strcmp(tag->key, "videodatarate")
            ||!strcmp(tag->key, "framerate")
            ||!strcmp(tag->key, "videocodecid")
            ||!strcmp(tag->key, "audiodatarate")
            ||!strcmp(tag->key, "audiosamplerate")
            ||!strcmp(tag->key, "audiosamplesize")
            ||!strcmp(tag->key, "stereo")
            ||!strcmp(tag->key, "audiocodecid")
            ||!strcmp(tag->key, "duration")
            ||!strcmp(tag->key, "onMetaData")
        ){
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            av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
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            continue;
        }
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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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        metadata_count++;
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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_count_pos, SEEK_SET);
    avio_wb32(pb, metadata_count);

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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++) {
        AVCodecContext *enc = s->streams[i]->codec;
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        if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_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
            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 == AV_CODEC_ID_AAC) {
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                avio_w8(pb, get_audio_flags(s, enc));
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                avio_w8(pb, 0); // AAC sequence header
                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
                avio_w8(pb, 0); // AVC sequence header
                avio_wb24(pb, 0); // composition time
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                ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
            }
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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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    return 0;
}

static int flv_write_trailer(AVFormatContext *s)
{
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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;

    /* Add EOS tag */
    for (i = 0; i < s->nb_streams; i++) {
        AVCodecContext *enc = s->streams[i]->codec;
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        FLVStreamContext *sc = s->streams[i]->priv_data;
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        if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
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                (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
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            put_avc_eos_tag(pb, sc->last_ts);
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    }
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    file_size = avio_tell(pb);
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    /* update information */
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    if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
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        av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
    else
        put_amf_double(pb, flv->duration / (double)1000);
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    if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
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        av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
    else
        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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static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    AVIOContext *pb      = s->pb;
    AVCodecContext *enc  = s->streams[pkt->stream_index]->codec;
    FLVContext *flv      = s->priv_data;
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    FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
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    unsigned ts;
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    int size = pkt->size;
    uint8_t *data = NULL;
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    int flags = -1, flags_size, ret;
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    if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
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        enc->codec_id == AV_CODEC_ID_VP6  || enc->codec_id == AV_CODEC_ID_AAC)
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        flags_size = 2;
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    else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_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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    switch (enc->codec_type) {
    case 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) {
            av_log(s, AV_LOG_ERROR,
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                   "Video codec '%s' is not compatible with FLV\n",
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                   avcodec_get_name(enc->codec_id));
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            return AVERROR(EINVAL);
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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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        break;
    case AVMEDIA_TYPE_AUDIO:
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        flags = get_audio_flags(s, enc);
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        av_assert0(size);
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        avio_w8(pb, FLV_TAG_TYPE_AUDIO);
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        break;
    case AVMEDIA_TYPE_DATA:
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        avio_w8(pb, FLV_TAG_TYPE_META);
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        break;
    default:
        return AVERROR(EINVAL);
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    }
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    if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_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 ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
                return ret;
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    } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
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               (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
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        if (!s->streams[pkt->stream_index]->nb_frames) {
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        av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
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               "use audio bitstream filter 'aac_adtstoasc' to fix it "
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               "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
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        return AVERROR_INVALIDDATA;
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        }
        av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
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    }
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    if (flv->delay == AV_NOPTS_VALUE)
        flv->delay = -pkt->dts;
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    if (pkt->dts < -flv->delay) {
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        av_log(s, AV_LOG_WARNING,
               "Packets are not in the proper order with respect to DTS\n");
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        return AVERROR(EINVAL);
    }
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    ts = pkt->dts + flv->delay; // add delay to force positive dts
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    /* check Speex packet duration */
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    if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
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        av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
                                  "8 frames per packet. Adobe Flash "
                                  "Player cannot handle this!\n");

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    if (sc->last_ts < ts)
        sc->last_ts = ts;
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    avio_wb24(pb, size + flags_size);
    avio_wb24(pb, ts);
    avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
    avio_wb24(pb, flv->reserved);
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    if (enc->codec_type == AVMEDIA_TYPE_DATA) {
        int data_size;
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        int64_t metadata_size_pos = avio_tell(pb);
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        avio_w8(pb, AMF_DATA_TYPE_STRING);
        put_amf_string(pb, "onTextData");
        avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
        avio_wb32(pb, 2);
        put_amf_string(pb, "type");
        avio_w8(pb, AMF_DATA_TYPE_STRING);
        put_amf_string(pb, "Text");
        put_amf_string(pb, "text");
        avio_w8(pb, AMF_DATA_TYPE_STRING);
        put_amf_string(pb, pkt->data);
        put_amf_string(pb, "");
        avio_w8(pb, AMF_END_OF_OBJECT);
        /* write total size of tag */
        data_size = avio_tell(pb) - metadata_size_pos;
        avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
        avio_wb24(pb, data_size);
        avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
        avio_wb32(pb, data_size + 11);
    } else {
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        av_assert1(flags>=0);
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        avio_w8(pb,flags);
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        if (enc->codec_id == AV_CODEC_ID_VP6)
            avio_w8(pb,0);
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        if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A) {
            if (enc->extradata_size)
                avio_w8(pb, enc->extradata[0]);
            else
                avio_w8(pb, ((FFALIGN(enc->width,  16) - enc->width) << 4) |
                             (FFALIGN(enc->height, 16) - enc->height));
        } else if (enc->codec_id == AV_CODEC_ID_AAC)
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            avio_w8(pb, 1); // AAC raw
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        else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
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            avio_w8(pb, 1); // AVC NALU
            avio_wb24(pb, pkt->pts - pkt->dts);
        }
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        avio_write(pb, data ? data : pkt->data, size);
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        avio_wb32(pb, size + flags_size + 11); // previous tag size
        flv->duration = FFMAX(flv->duration,
                              pkt->pts + flv->delay + pkt->duration);
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    }
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    av_free(data);

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    return pb->error;
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}

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AVOutputFormat ff_flv_muxer = {
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    .name           = "flv",
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    .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
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    .mime_type      = "video/x-flv",
    .extensions     = "flv",
    .priv_data_size = sizeof(FLVContext),
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    .audio_codec    = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
    .video_codec    = AV_CODEC_ID_FLV1,
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    .write_header   = flv_write_header,
    .write_packet   = flv_write_packet,
    .write_trailer  = flv_write_trailer,
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    .codec_tag      = (const AVCodecTag* const []) {
                          flv_video_codec_ids, flv_audio_codec_ids, 0
                      },
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    .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
                      AVFMT_TS_NONSTRICT,
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};