[deb_ffmpeg.git] / ffmpeg / libavformat / flvenc.c

/*
 * FLV muxer
 * Copyright (c) 2003 The FFmpeg Project
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * 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
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/intfloat.h"
#include "libavutil/avassert.h"
#include "avc.h"
#include "avformat.h"
#include "flv.h"
#include "internal.h"
#include "metadata.h"


static const AVCodecTag flv_video_codec_ids[] = {
    { AV_CODEC_ID_FLV1,     FLV_CODECID_H263 },
    { AV_CODEC_ID_H263,     FLV_CODECID_REALH263 },
    { AV_CODEC_ID_MPEG4,    FLV_CODECID_MPEG4 },
    { AV_CODEC_ID_FLASHSV,  FLV_CODECID_SCREEN },
    { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
    { AV_CODEC_ID_VP6F,     FLV_CODECID_VP6 },
    { AV_CODEC_ID_VP6,      FLV_CODECID_VP6 },
    { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
    { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
    { AV_CODEC_ID_NONE,     0 }
};

static const AVCodecTag flv_audio_codec_ids[] = {
    { 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 }
};

typedef struct FLVContext {
    int     reserved;
    int64_t duration_offset;
    int64_t filesize_offset;
    int64_t duration;
    int64_t delay;      ///< first dts delay (needed for AVC & Speex)
} FLVContext;

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

static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
{
    int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
                                                   : FLV_SAMPLESSIZE_8BIT;

    if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
        return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
               FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
    else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
        if (enc->sample_rate != 16000) {
            av_log(s, AV_LOG_ERROR,
                   "FLV only supports wideband (16kHz) Speex audio\n");
            return AVERROR(EINVAL);
        }
        if (enc->channels != 1) {
            av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
            return AVERROR(EINVAL);
        }
        return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
    } else {
        switch (enc->sample_rate) {
        case 44100:
            flags |= FLV_SAMPLERATE_44100HZ;
            break;
        case 22050:
            flags |= FLV_SAMPLERATE_22050HZ;
            break;
        case 11025:
            flags |= FLV_SAMPLERATE_11025HZ;
            break;
        case 16000: // nellymoser only
        case  8000: // nellymoser only
        case  5512: // not MP3
            if (enc->codec_id != AV_CODEC_ID_MP3) {
                flags |= FLV_SAMPLERATE_SPECIAL;
                break;
            }
        default:
            av_log(s, AV_LOG_ERROR,
                   "FLV does not support sample rate %d, "
                   "choose from (44100, 22050, 11025)\n", enc->sample_rate);
            return AVERROR(EINVAL);
        }
    }

    if (enc->channels > 1)
        flags |= FLV_STEREO;

    switch (enc->codec_id) {
    case AV_CODEC_ID_MP3:
        flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_PCM_U8:
        flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_8BIT;
        break;
    case AV_CODEC_ID_PCM_S16BE:
        flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_PCM_S16LE:
        flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_ADPCM_SWF:
        flags |= FLV_CODECID_ADPCM  | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_NELLYMOSER:
        if (enc->sample_rate == 8000)
            flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO  | FLV_SAMPLESSIZE_16BIT;
        else if (enc->sample_rate == 16000)
            flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
        else
            flags |= FLV_CODECID_NELLYMOSER            | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_PCM_MULAW:
        flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
        break;
    case AV_CODEC_ID_PCM_ALAW:
        flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
        break;
    case 0:
        flags |= enc->codec_tag << 4;
        break;
    default:
        av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
               avcodec_get_name(enc->codec_id));
        return AVERROR(EINVAL);
    }

    return flags;
}

static void put_amf_string(AVIOContext *pb, const char *str)
{
    size_t len = strlen(str);
    avio_wb16(pb, len);
    avio_write(pb, str, len);
}

static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
{
    avio_w8(pb, FLV_TAG_TYPE_VIDEO);
    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 */
}

static void put_amf_double(AVIOContext *pb, double d)
{
    avio_w8(pb, AMF_DATA_TYPE_NUMBER);
    avio_wb64(pb, av_double2int(d));
}

static void put_amf_bool(AVIOContext *pb, int b)
{
    avio_w8(pb, AMF_DATA_TYPE_BOOL);
    avio_w8(pb, !!b);
}

static int flv_write_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    FLVContext *flv = s->priv_data;
    AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;
    int i, metadata_count = 0;
    double framerate = 0.0;
    int64_t metadata_size_pos, data_size, metadata_count_pos;
    AVDictionaryEntry *tag = NULL;

    for (i = 0; i < s->nb_streams; i++) {
        AVCodecContext *enc = s->streams[i]->codec;
        FLVStreamContext *sc;
        switch (enc->codec_type) {
        case AVMEDIA_TYPE_VIDEO:
            if (s->streams[i]->avg_frame_rate.den &&
                s->streams[i]->avg_frame_rate.num) {
                framerate = av_q2d(s->streams[i]->avg_frame_rate);
            }
            if (video_enc) {
                av_log(s, AV_LOG_ERROR,
                       "at most one video stream is supported in flv\n");
                return AVERROR(EINVAL);
            }
            video_enc = enc;
            if (enc->codec_tag == 0) {
                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);
                return AVERROR(EINVAL);
            }
            if (enc->codec_id == AV_CODEC_ID_MPEG4 ||
                enc->codec_id == AV_CODEC_ID_H263) {
                int error = enc->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
                av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
                       "Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(enc->codec_id));

                if (error) {
                    av_log(s, AV_LOG_ERROR,
                           "use vstrict=-1 / -strict -1 to use it anyway.\n");
                    return AVERROR(EINVAL);
                }
            }
            break;
        case AVMEDIA_TYPE_AUDIO:
            if (audio_enc) {
                av_log(s, AV_LOG_ERROR,
                       "at most one audio stream is supported in flv\n");
                return AVERROR(EINVAL);
            }
            audio_enc = enc;
            if (get_audio_flags(s, enc) < 0)
                return AVERROR_INVALIDDATA;
            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");
            break;
        case AVMEDIA_TYPE_DATA:
            if (enc->codec_id != AV_CODEC_ID_TEXT) {
                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);
                return AVERROR_INVALIDDATA;
            }
            data_enc = enc;
            break;
        default:
            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);
            return AVERROR(EINVAL);
        }
        avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */

        sc = av_mallocz(sizeof(FLVStreamContext));
        if (!sc)
            return AVERROR(ENOMEM);
        s->streams[i]->priv_data = sc;
        sc->last_ts = -1;
    }

    flv->delay = AV_NOPTS_VALUE;

    avio_write(pb, "FLV", 3);
    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;
        }

    /* write meta_tag */
    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

    /* now data of data_size size */

    /* first event name as a string */
    avio_w8(pb, AMF_DATA_TYPE_STRING);
    put_amf_string(pb, "onMetaData"); // 12 bytes

    /* mixed array (hash) with size and string/type/data tuples */
    avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
    metadata_count_pos = avio_tell(pb);
    metadata_count = 4 * !!video_enc +
                     5 * !!audio_enc +
                     1 * !!data_enc  +
                     2; // +2 for duration and file size

    avio_wb32(pb, metadata_count);

    put_amf_string(pb, "duration");
    flv->duration_offset= avio_tell(pb);

    // fill in the guessed duration, it'll be corrected later if incorrect
    put_amf_double(pb, s->duration / AV_TIME_BASE);

    if (video_enc) {
        put_amf_string(pb, "width");
        put_amf_double(pb, video_enc->width);

        put_amf_string(pb, "height");
        put_amf_double(pb, video_enc->height);

        put_amf_string(pb, "videodatarate");
        put_amf_double(pb, video_enc->bit_rate / 1024.0);

        if (framerate != 0.0) {
            put_amf_string(pb, "framerate");
            put_amf_double(pb, framerate);
            metadata_count++;
        }

        put_amf_string(pb, "videocodecid");
        put_amf_double(pb, video_enc->codec_tag);
    }

    if (audio_enc) {
        put_amf_string(pb, "audiodatarate");
        put_amf_double(pb, audio_enc->bit_rate / 1024.0);

        put_amf_string(pb, "audiosamplerate");
        put_amf_double(pb, audio_enc->sample_rate);

        put_amf_string(pb, "audiosamplesize");
        put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);

        put_amf_string(pb, "stereo");
        put_amf_bool(pb, audio_enc->channels == 2);

        put_amf_string(pb, "audiocodecid");
        put_amf_double(pb, audio_enc->codec_tag);
    }

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

    while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
        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")
        ){
            av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
            continue;
        }
        put_amf_string(pb, tag->key);
        avio_w8(pb, AMF_DATA_TYPE_STRING);
        put_amf_string(pb, tag->value);
        metadata_count++;
    }

    put_amf_string(pb, "filesize");
    flv->filesize_offset = avio_tell(pb);
    put_amf_double(pb, 0); // delayed write

    put_amf_string(pb, "");
    avio_w8(pb, AMF_END_OF_OBJECT);

    /* write total size of tag */
    data_size = avio_tell(pb) - metadata_size_pos - 10;

    avio_seek(pb, metadata_count_pos, SEEK_SET);
    avio_wb32(pb, metadata_count);

    avio_seek(pb, metadata_size_pos, SEEK_SET);
    avio_wb24(pb, data_size);
    avio_skip(pb, data_size + 10 - 3);
    avio_wb32(pb, data_size + 11);

    for (i = 0; i < s->nb_streams; i++) {
        AVCodecContext *enc = s->streams[i]->codec;
        if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
            int64_t pos;
            avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
                    FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
            avio_wb24(pb, 0); // size patched later
            avio_wb24(pb, 0); // ts
            avio_w8(pb, 0);   // ts ext
            avio_wb24(pb, 0); // streamid
            pos = avio_tell(pb);
            if (enc->codec_id == AV_CODEC_ID_AAC) {
                avio_w8(pb, get_audio_flags(s, enc));
                avio_w8(pb, 0); // AAC sequence header
                avio_write(pb, enc->extradata, enc->extradata_size);
            } else {
                avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
                avio_w8(pb, 0); // AVC sequence header
                avio_wb24(pb, 0); // composition time
                ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
            }
            data_size = avio_tell(pb) - pos;
            avio_seek(pb, -data_size - 10, SEEK_CUR);
            avio_wb24(pb, data_size);
            avio_skip(pb, data_size + 10 - 3);
            avio_wb32(pb, data_size + 11); // previous tag size
        }
    }

    return 0;
}

static int flv_write_trailer(AVFormatContext *s)
{
    int64_t file_size;

    AVIOContext *pb = s->pb;
    FLVContext *flv = s->priv_data;
    int i;

    /* Add EOS tag */
    for (i = 0; i < s->nb_streams; i++) {
        AVCodecContext *enc = s->streams[i]->codec;
        FLVStreamContext *sc = s->streams[i]->priv_data;
        if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
                (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
            put_avc_eos_tag(pb, sc->last_ts);
    }

    file_size = avio_tell(pb);

    /* update information */
    if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
        av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
    else
        put_amf_double(pb, flv->duration / (double)1000);
    if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
        av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
    else
        put_amf_double(pb, file_size);

    avio_seek(pb, file_size, SEEK_SET);
    return 0;
}

static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIOContext *pb      = s->pb;
    AVCodecContext *enc  = s->streams[pkt->stream_index]->codec;
    FLVContext *flv      = s->priv_data;
    FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
    unsigned ts;
    int size = pkt->size;
    uint8_t *data = NULL;
    int flags = -1, flags_size, ret;

    if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
        enc->codec_id == AV_CODEC_ID_VP6  || enc->codec_id == AV_CODEC_ID_AAC)
        flags_size = 2;
    else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)
        flags_size = 5;
    else
        flags_size = 1;

    switch (enc->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        avio_w8(pb, FLV_TAG_TYPE_VIDEO);

        flags = enc->codec_tag;
        if (flags == 0) {
            av_log(s, AV_LOG_ERROR,
                   "Video codec '%s' is not compatible with FLV\n",
                   avcodec_get_name(enc->codec_id));
            return AVERROR(EINVAL);
        }

        flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
        break;
    case AVMEDIA_TYPE_AUDIO:
        flags = get_audio_flags(s, enc);

        av_assert0(size);

        avio_w8(pb, FLV_TAG_TYPE_AUDIO);
        break;
    case AVMEDIA_TYPE_DATA:
        avio_w8(pb, FLV_TAG_TYPE_META);
        break;
    default:
        return AVERROR(EINVAL);
    }

    if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
        /* check if extradata looks like mp4 formated */
        if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
            if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
                return ret;
    } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
               (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
        if (!s->streams[pkt->stream_index]->nb_frames) {
        av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
               "use the audio bitstream filter 'aac_adtstoasc' to fix it "
               "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
        return AVERROR_INVALIDDATA;
        }
        av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
    }

    if (flv->delay == AV_NOPTS_VALUE)
        flv->delay = -pkt->dts;

    if (pkt->dts < -flv->delay) {
        av_log(s, AV_LOG_WARNING,
               "Packets are not in the proper order with respect to DTS\n");
        return AVERROR(EINVAL);
    }

    ts = pkt->dts + flv->delay; // add delay to force positive dts

    /* check Speex packet duration */
    if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
        av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
                                  "8 frames per packet. Adobe Flash "
                                  "Player cannot handle this!\n");

    if (sc->last_ts < ts)
        sc->last_ts = ts;

    avio_wb24(pb, size + flags_size);
    avio_wb24(pb, ts & 0xFFFFFF);
    avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
    avio_wb24(pb, flv->reserved);

    if (enc->codec_type == AVMEDIA_TYPE_DATA) {
        int data_size;
        int64_t metadata_size_pos = avio_tell(pb);
        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 {
        av_assert1(flags>=0);
        avio_w8(pb,flags);
        if (enc->codec_id == AV_CODEC_ID_VP6)
            avio_w8(pb,0);
        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)
            avio_w8(pb, 1); // AAC raw
        else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_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);
    }

    av_free(data);

    return pb->error;
}

AVOutputFormat ff_flv_muxer = {
    .name           = "flv",
    .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
    .mime_type      = "video/x-flv",
    .extensions     = "flv",
    .priv_data_size = sizeof(FLVContext),
    .audio_codec    = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
    .video_codec    = AV_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 |
                      AVFMT_TS_NONSTRICT,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* FLV muxer
	3	* Copyright (c) 2003 The FFmpeg Project
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "libavutil/intreadwrite.h"
	23	#include "libavutil/dict.h"
	24	#include "libavutil/intfloat.h"
	25	#include "libavutil/avassert.h"
	26	#include "avc.h"
	27	#include "avformat.h"
	28	#include "flv.h"
	29	#include "internal.h"
	30	#include "metadata.h"
	31
	32
	33	static const AVCodecTag flv_video_codec_ids[] = {
	34	{ AV_CODEC_ID_FLV1, FLV_CODECID_H263 },
	35	{ AV_CODEC_ID_H263, FLV_CODECID_REALH263 },
	36	{ AV_CODEC_ID_MPEG4, FLV_CODECID_MPEG4 },
	37	{ AV_CODEC_ID_FLASHSV, FLV_CODECID_SCREEN },
	38	{ AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
	39	{ AV_CODEC_ID_VP6F, FLV_CODECID_VP6 },
	40	{ AV_CODEC_ID_VP6, FLV_CODECID_VP6 },
	41	{ AV_CODEC_ID_VP6A, FLV_CODECID_VP6A },
	42	{ AV_CODEC_ID_H264, FLV_CODECID_H264 },
	43	{ AV_CODEC_ID_NONE, 0 }
	44	};
	45
	46	static const AVCodecTag flv_audio_codec_ids[] = {
	47	{ AV_CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET },
	48	{ AV_CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
	49	{ AV_CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET },
	50	{ AV_CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET },
	51	{ AV_CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET },
	52	{ AV_CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET },
	53	{ AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
	54	{ AV_CODEC_ID_PCM_MULAW, FLV_CODECID_PCM_MULAW >> FLV_AUDIO_CODECID_OFFSET },
	55	{ AV_CODEC_ID_PCM_ALAW, FLV_CODECID_PCM_ALAW >> FLV_AUDIO_CODECID_OFFSET },
	56	{ AV_CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET },
	57	{ AV_CODEC_ID_NONE, 0 }
	58	};
	59
	60	typedef struct FLVContext {
	61	int reserved;
	62	int64_t duration_offset;
	63	int64_t filesize_offset;
	64	int64_t duration;
65	int64_t delay; ///< first dts delay (needed for AVC & Speex)
66	} FLVContext;
67
68	typedef struct FLVStreamContext {
69	int64_t last_ts; ///< last timestamp for each stream
70	} FLVStreamContext;
71
72	static int get_audio_flags(AVFormatContext s, AVCodecContext enc)
73	{
74	int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
75	: FLV_SAMPLESSIZE_8BIT;
76
77	if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
78	return FLV_CODECID_AAC \| FLV_SAMPLERATE_44100HZ \|
79	FLV_SAMPLESSIZE_16BIT \| FLV_STEREO;
80	else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
81	if (enc->sample_rate != 16000) {
82	av_log(s, AV_LOG_ERROR,
83	"FLV only supports wideband (16kHz) Speex audio\n");
84	return AVERROR(EINVAL);
85	}
86	if (enc->channels != 1) {
87	av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
88	return AVERROR(EINVAL);
89	}
90	return FLV_CODECID_SPEEX \| FLV_SAMPLERATE_11025HZ \| FLV_SAMPLESSIZE_16BIT;
91	} else {
92	switch (enc->sample_rate) {
93	case 44100:
94	flags \|= FLV_SAMPLERATE_44100HZ;
95	break;
96	case 22050:
97	flags \|= FLV_SAMPLERATE_22050HZ;
98	break;
99	case 11025:
100	flags \|= FLV_SAMPLERATE_11025HZ;
101	break;
102	case 16000: // nellymoser only
103	case 8000: // nellymoser only
104	case 5512: // not MP3
105	if (enc->codec_id != AV_CODEC_ID_MP3) {
106	flags \|= FLV_SAMPLERATE_SPECIAL;
107	break;
108	}
109	default:
110	av_log(s, AV_LOG_ERROR,
111	"FLV does not support sample rate %d, "
112	"choose from (44100, 22050, 11025)\n", enc->sample_rate);
113	return AVERROR(EINVAL);
114	}
115	}
116
117	if (enc->channels > 1)
118	flags \|= FLV_STEREO;
119
120	switch (enc->codec_id) {
121	case AV_CODEC_ID_MP3:
122	flags \|= FLV_CODECID_MP3 \| FLV_SAMPLESSIZE_16BIT;
123	break;
124	case AV_CODEC_ID_PCM_U8:
125	flags \|= FLV_CODECID_PCM \| FLV_SAMPLESSIZE_8BIT;
126	break;
127	case AV_CODEC_ID_PCM_S16BE:
128	flags \|= FLV_CODECID_PCM \| FLV_SAMPLESSIZE_16BIT;
129	break;
130	case AV_CODEC_ID_PCM_S16LE:
131	flags \|= FLV_CODECID_PCM_LE \| FLV_SAMPLESSIZE_16BIT;
132	break;
133	case AV_CODEC_ID_ADPCM_SWF:
134	flags \|= FLV_CODECID_ADPCM \| FLV_SAMPLESSIZE_16BIT;
135	break;
136	case AV_CODEC_ID_NELLYMOSER:
137	if (enc->sample_rate == 8000)
138	flags \|= FLV_CODECID_NELLYMOSER_8KHZ_MONO \| FLV_SAMPLESSIZE_16BIT;
139	else if (enc->sample_rate == 16000)
140	flags \|= FLV_CODECID_NELLYMOSER_16KHZ_MONO \| FLV_SAMPLESSIZE_16BIT;
141	else
142	flags \|= FLV_CODECID_NELLYMOSER \| FLV_SAMPLESSIZE_16BIT;
143	break;
144	case AV_CODEC_ID_PCM_MULAW:
145	flags = FLV_CODECID_PCM_MULAW \| FLV_SAMPLERATE_SPECIAL \| FLV_SAMPLESSIZE_16BIT;
146	break;
147	case AV_CODEC_ID_PCM_ALAW:
148	flags = FLV_CODECID_PCM_ALAW \| FLV_SAMPLERATE_SPECIAL \| FLV_SAMPLESSIZE_16BIT;
149	break;
150	case 0:
151	flags \|= enc->codec_tag << 4;
152	break;
153	default:
154	av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
155	avcodec_get_name(enc->codec_id));
156	return AVERROR(EINVAL);
157	}
158
159	return flags;
160	}
161
162	static void put_amf_string(AVIOContext pb, const char str)
163	{
164	size_t len = strlen(str);
165	avio_wb16(pb, len);
166	avio_write(pb, str, len);
167	}
168
169	static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
170	{
171	avio_w8(pb, FLV_TAG_TYPE_VIDEO);
172	avio_wb24(pb, 5); /* Tag Data Size */
173	avio_wb24(pb, ts); /* lower 24 bits of timestamp in ms */
174	avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
175	avio_wb24(pb, 0); /* StreamId = 0 */
176	avio_w8(pb, 23); /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
177	avio_w8(pb, 2); /* AVC end of sequence */
178	avio_wb24(pb, 0); /* Always 0 for AVC EOS. */
179	avio_wb32(pb, 16); /* Size of FLV tag */
180	}
181
182	static void put_amf_double(AVIOContext *pb, double d)
183	{
184	avio_w8(pb, AMF_DATA_TYPE_NUMBER);
185	avio_wb64(pb, av_double2int(d));
186	}
187
188	static void put_amf_bool(AVIOContext *pb, int b)
189	{
190	avio_w8(pb, AMF_DATA_TYPE_BOOL);
191	avio_w8(pb, !!b);
192	}
193
194	static int flv_write_header(AVFormatContext *s)
195	{
196	AVIOContext *pb = s->pb;
197	FLVContext *flv = s->priv_data;
198	AVCodecContext audio_enc = NULL, video_enc = NULL, *data_enc = NULL;
199	int i, metadata_count = 0;
200	double framerate = 0.0;
201	int64_t metadata_size_pos, data_size, metadata_count_pos;
202	AVDictionaryEntry *tag = NULL;
203
204	for (i = 0; i < s->nb_streams; i++) {
205	AVCodecContext *enc = s->streams[i]->codec;
206	FLVStreamContext *sc;
207	switch (enc->codec_type) {
208	case AVMEDIA_TYPE_VIDEO:
209	if (s->streams[i]->avg_frame_rate.den &&
210	s->streams[i]->avg_frame_rate.num) {
211	framerate = av_q2d(s->streams[i]->avg_frame_rate);
212	}
213	if (video_enc) {
214	av_log(s, AV_LOG_ERROR,
215	"at most one video stream is supported in flv\n");
216	return AVERROR(EINVAL);
217	}
218	video_enc = enc;
219	if (enc->codec_tag == 0) {
220	av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",
221	avcodec_get_name(enc->codec_id), i);
222	return AVERROR(EINVAL);
223	}
224	if (enc->codec_id == AV_CODEC_ID_MPEG4 \|\|
225	enc->codec_id == AV_CODEC_ID_H263) {
226	int error = enc->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL;
227	av_log(s, error ? AV_LOG_ERROR : AV_LOG_WARNING,
228	"Codec %s is not supported in the official FLV specification,\n", avcodec_get_name(enc->codec_id));
229
230	if (error) {
231	av_log(s, AV_LOG_ERROR,
232	"use vstrict=-1 / -strict -1 to use it anyway.\n");
233	return AVERROR(EINVAL);
234	}
235	}
236	break;
237	case AVMEDIA_TYPE_AUDIO:
238	if (audio_enc) {
239	av_log(s, AV_LOG_ERROR,
240	"at most one audio stream is supported in flv\n");
241	return AVERROR(EINVAL);
242	}
243	audio_enc = enc;
244	if (get_audio_flags(s, enc) < 0)
245	return AVERROR_INVALIDDATA;
246	if (enc->codec_id == AV_CODEC_ID_PCM_S16BE)
247	av_log(s, AV_LOG_WARNING,
248	"16-bit big-endian audio in flv is valid but most likely unplayable (hardware dependent); use s16le\n");
249	break;
250	case AVMEDIA_TYPE_DATA:
251	if (enc->codec_id != AV_CODEC_ID_TEXT) {
252	av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",
253	avcodec_get_name(enc->codec_id), i);
254	return AVERROR_INVALIDDATA;
255	}
256	data_enc = enc;
257	break;
258	default:
259	av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
260	av_get_media_type_string(enc->codec_type), i);
261	return AVERROR(EINVAL);
262	}
263	avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
264
265	sc = av_mallocz(sizeof(FLVStreamContext));
266	if (!sc)
267	return AVERROR(ENOMEM);
268	s->streams[i]->priv_data = sc;
269	sc->last_ts = -1;
270	}
271
272	flv->delay = AV_NOPTS_VALUE;
273
274	avio_write(pb, "FLV", 3);
275	avio_w8(pb, 1);
276	avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
277	FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
278	avio_wb32(pb, 9);
279	avio_wb32(pb, 0);
280
281	for (i = 0; i < s->nb_streams; i++)
282	if (s->streams[i]->codec->codec_tag == 5) {
283	avio_w8(pb, 8); // message type
284	avio_wb24(pb, 0); // include flags
285	avio_wb24(pb, 0); // time stamp
286	avio_wb32(pb, 0); // reserved
287	avio_wb32(pb, 11); // size
288	flv->reserved = 5;
289	}
290
291	/* write meta_tag */
292	avio_w8(pb, 18); // tag type META
293	metadata_size_pos = avio_tell(pb);
294	avio_wb24(pb, 0); // size of data part (sum of all parts below)
295	avio_wb24(pb, 0); // timestamp
296	avio_wb32(pb, 0); // reserved
297
298	/* now data of data_size size */
299
300	/* first event name as a string */
301	avio_w8(pb, AMF_DATA_TYPE_STRING);
302	put_amf_string(pb, "onMetaData"); // 12 bytes
303
304	/* mixed array (hash) with size and string/type/data tuples */
305	avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
306	metadata_count_pos = avio_tell(pb);
307	metadata_count = 4 * !!video_enc +
308	5 * !!audio_enc +
309	1 * !!data_enc +
310	2; // +2 for duration and file size
311
312	avio_wb32(pb, metadata_count);
313
314	put_amf_string(pb, "duration");
315	flv->duration_offset= avio_tell(pb);
316
317	// fill in the guessed duration, it'll be corrected later if incorrect
318	put_amf_double(pb, s->duration / AV_TIME_BASE);
319
320	if (video_enc) {
321	put_amf_string(pb, "width");
322	put_amf_double(pb, video_enc->width);
323
324	put_amf_string(pb, "height");
325	put_amf_double(pb, video_enc->height);
326
327	put_amf_string(pb, "videodatarate");
328	put_amf_double(pb, video_enc->bit_rate / 1024.0);
329
330	if (framerate != 0.0) {
331	put_amf_string(pb, "framerate");
332	put_amf_double(pb, framerate);
333	metadata_count++;
334	}
335
336	put_amf_string(pb, "videocodecid");
337	put_amf_double(pb, video_enc->codec_tag);
338	}
339
340	if (audio_enc) {
341	put_amf_string(pb, "audiodatarate");
342	put_amf_double(pb, audio_enc->bit_rate / 1024.0);
343
344	put_amf_string(pb, "audiosamplerate");
345	put_amf_double(pb, audio_enc->sample_rate);
346
347	put_amf_string(pb, "audiosamplesize");
348	put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
349
350	put_amf_string(pb, "stereo");
351	put_amf_bool(pb, audio_enc->channels == 2);
352
353	put_amf_string(pb, "audiocodecid");
354	put_amf_double(pb, audio_enc->codec_tag);
355	}
356
357	if (data_enc) {
358	put_amf_string(pb, "datastream");
359	put_amf_double(pb, 0.0);
360	}
361
362	while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
363	if( !strcmp(tag->key, "width")
364	\|\|!strcmp(tag->key, "height")
365	\|\|!strcmp(tag->key, "videodatarate")
366	\|\|!strcmp(tag->key, "framerate")
367	\|\|!strcmp(tag->key, "videocodecid")
368	\|\|!strcmp(tag->key, "audiodatarate")
369	\|\|!strcmp(tag->key, "audiosamplerate")
370	\|\|!strcmp(tag->key, "audiosamplesize")
371	\|\|!strcmp(tag->key, "stereo")
372	\|\|!strcmp(tag->key, "audiocodecid")
373	\|\|!strcmp(tag->key, "duration")
374	\|\|!strcmp(tag->key, "onMetaData")
375	){
376	av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
377	continue;
378	}
379	put_amf_string(pb, tag->key);
380	avio_w8(pb, AMF_DATA_TYPE_STRING);
381	put_amf_string(pb, tag->value);
382	metadata_count++;
383	}
384
385	put_amf_string(pb, "filesize");
386	flv->filesize_offset = avio_tell(pb);
387	put_amf_double(pb, 0); // delayed write
388
389	put_amf_string(pb, "");
390	avio_w8(pb, AMF_END_OF_OBJECT);
391
392	/* write total size of tag */
393	data_size = avio_tell(pb) - metadata_size_pos - 10;
394
395	avio_seek(pb, metadata_count_pos, SEEK_SET);
396	avio_wb32(pb, metadata_count);
397
398	avio_seek(pb, metadata_size_pos, SEEK_SET);
399	avio_wb24(pb, data_size);
400	avio_skip(pb, data_size + 10 - 3);
401	avio_wb32(pb, data_size + 11);
402
403	for (i = 0; i < s->nb_streams; i++) {
404	AVCodecContext *enc = s->streams[i]->codec;
405	if (enc->codec_id == AV_CODEC_ID_AAC \|\| enc->codec_id == AV_CODEC_ID_H264 \|\| enc->codec_id == AV_CODEC_ID_MPEG4) {
406	int64_t pos;
407	avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
408	FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
409	avio_wb24(pb, 0); // size patched later
410	avio_wb24(pb, 0); // ts
411	avio_w8(pb, 0); // ts ext
412	avio_wb24(pb, 0); // streamid
413	pos = avio_tell(pb);
414	if (enc->codec_id == AV_CODEC_ID_AAC) {
415	avio_w8(pb, get_audio_flags(s, enc));
416	avio_w8(pb, 0); // AAC sequence header
417	avio_write(pb, enc->extradata, enc->extradata_size);
418	} else {
419	avio_w8(pb, enc->codec_tag \| FLV_FRAME_KEY); // flags
420	avio_w8(pb, 0); // AVC sequence header
421	avio_wb24(pb, 0); // composition time
422	ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
423	}
424	data_size = avio_tell(pb) - pos;
425	avio_seek(pb, -data_size - 10, SEEK_CUR);
426	avio_wb24(pb, data_size);
427	avio_skip(pb, data_size + 10 - 3);
428	avio_wb32(pb, data_size + 11); // previous tag size
429	}
430	}
431
432	return 0;
433	}
434
435	static int flv_write_trailer(AVFormatContext *s)
436	{
437	int64_t file_size;
438
439	AVIOContext *pb = s->pb;
440	FLVContext *flv = s->priv_data;
441	int i;
442
443	/* Add EOS tag */
444	for (i = 0; i < s->nb_streams; i++) {
445	AVCodecContext *enc = s->streams[i]->codec;
446	FLVStreamContext *sc = s->streams[i]->priv_data;
447	if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
448	(enc->codec_id == AV_CODEC_ID_H264 \|\| enc->codec_id == AV_CODEC_ID_MPEG4))
449	put_avc_eos_tag(pb, sc->last_ts);
450	}
451
452	file_size = avio_tell(pb);
453
454	/* update information */
455	if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
456	av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
457	else
458	put_amf_double(pb, flv->duration / (double)1000);
459	if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
460	av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
461	else
462	put_amf_double(pb, file_size);
463
464	avio_seek(pb, file_size, SEEK_SET);
465	return 0;
466	}
467
468	static int flv_write_packet(AVFormatContext s, AVPacket pkt)
469	{
470	AVIOContext *pb = s->pb;
471	AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
472	FLVContext *flv = s->priv_data;
473	FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
474	unsigned ts;
475	int size = pkt->size;
476	uint8_t *data = NULL;
477	int flags = -1, flags_size, ret;
478
479	if (enc->codec_id == AV_CODEC_ID_VP6F \|\| enc->codec_id == AV_CODEC_ID_VP6A \|\|
480	enc->codec_id == AV_CODEC_ID_VP6 \|\| enc->codec_id == AV_CODEC_ID_AAC)
481	flags_size = 2;
482	else if (enc->codec_id == AV_CODEC_ID_H264 \|\| enc->codec_id == AV_CODEC_ID_MPEG4)
483	flags_size = 5;
484	else
485	flags_size = 1;
486
487	switch (enc->codec_type) {
488	case AVMEDIA_TYPE_VIDEO:
489	avio_w8(pb, FLV_TAG_TYPE_VIDEO);
490
491	flags = enc->codec_tag;
492	if (flags == 0) {
493	av_log(s, AV_LOG_ERROR,
494	"Video codec '%s' is not compatible with FLV\n",
495	avcodec_get_name(enc->codec_id));
496	return AVERROR(EINVAL);
497	}
498
499	flags \|= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
500	break;
501	case AVMEDIA_TYPE_AUDIO:
502	flags = get_audio_flags(s, enc);
503
504	av_assert0(size);
505
506	avio_w8(pb, FLV_TAG_TYPE_AUDIO);
507	break;
508	case AVMEDIA_TYPE_DATA:
509	avio_w8(pb, FLV_TAG_TYPE_META);
510	break;
511	default:
512	return AVERROR(EINVAL);
513	}
514
515	if (enc->codec_id == AV_CODEC_ID_H264 \|\| enc->codec_id == AV_CODEC_ID_MPEG4) {
516	/* check if extradata looks like mp4 formated */
517	if (enc->extradata_size > 0 && (uint8_t)enc->extradata != 1)
518	if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
519	return ret;
520	} else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
521	(AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
522	if (!s->streams[pkt->stream_index]->nb_frames) {
523	av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
524	"use the audio bitstream filter 'aac_adtstoasc' to fix it "
525	"('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
526	return AVERROR_INVALIDDATA;
527	}
528	av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
529	}
530
531	if (flv->delay == AV_NOPTS_VALUE)
532	flv->delay = -pkt->dts;
533
534	if (pkt->dts < -flv->delay) {
535	av_log(s, AV_LOG_WARNING,
536	"Packets are not in the proper order with respect to DTS\n");
537	return AVERROR(EINVAL);
538	}
539
540	ts = pkt->dts + flv->delay; // add delay to force positive dts
541
542	/* check Speex packet duration */
543	if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
544	av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
545	"8 frames per packet. Adobe Flash "
546	"Player cannot handle this!\n");
547
548	if (sc->last_ts < ts)
549	sc->last_ts = ts;
550
551	avio_wb24(pb, size + flags_size);
552	avio_wb24(pb, ts & 0xFFFFFF);
553	avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
554	avio_wb24(pb, flv->reserved);
555
556	if (enc->codec_type == AVMEDIA_TYPE_DATA) {
557	int data_size;
558	int64_t metadata_size_pos = avio_tell(pb);
559	avio_w8(pb, AMF_DATA_TYPE_STRING);
560	put_amf_string(pb, "onTextData");
561	avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
562	avio_wb32(pb, 2);
563	put_amf_string(pb, "type");
564	avio_w8(pb, AMF_DATA_TYPE_STRING);
565	put_amf_string(pb, "Text");
566	put_amf_string(pb, "text");
567	avio_w8(pb, AMF_DATA_TYPE_STRING);
568	put_amf_string(pb, pkt->data);
569	put_amf_string(pb, "");
570	avio_w8(pb, AMF_END_OF_OBJECT);
571	/* write total size of tag */
572	data_size = avio_tell(pb) - metadata_size_pos;
573	avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
574	avio_wb24(pb, data_size);
575	avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
576	avio_wb32(pb, data_size + 11);
577	} else {
578	av_assert1(flags>=0);
579	avio_w8(pb,flags);
580	if (enc->codec_id == AV_CODEC_ID_VP6)
581	avio_w8(pb,0);
582	if (enc->codec_id == AV_CODEC_ID_VP6F \|\| enc->codec_id == AV_CODEC_ID_VP6A) {
583	if (enc->extradata_size)
584	avio_w8(pb, enc->extradata[0]);
585	else
586	avio_w8(pb, ((FFALIGN(enc->width, 16) - enc->width) << 4) \|
587	(FFALIGN(enc->height, 16) - enc->height));
588	} else if (enc->codec_id == AV_CODEC_ID_AAC)
589	avio_w8(pb, 1); // AAC raw
590	else if (enc->codec_id == AV_CODEC_ID_H264 \|\| enc->codec_id == AV_CODEC_ID_MPEG4) {
591	avio_w8(pb, 1); // AVC NALU
592	avio_wb24(pb, pkt->pts - pkt->dts);
593	}
594
595	avio_write(pb, data ? data : pkt->data, size);
596
597	avio_wb32(pb, size + flags_size + 11); // previous tag size
598	flv->duration = FFMAX(flv->duration,
599	pkt->pts + flv->delay + pkt->duration);
600	}
601
602	av_free(data);
603
604	return pb->error;
605	}
606
607	AVOutputFormat ff_flv_muxer = {
608	.name = "flv",
609	.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
610	.mime_type = "video/x-flv",
611	.extensions = "flv",
612	.priv_data_size = sizeof(FLVContext),
613	.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
614	.video_codec = AV_CODEC_ID_FLV1,
615	.write_header = flv_write_header,
616	.write_packet = flv_write_packet,
617	.write_trailer = flv_write_trailer,
618	.codec_tag = (const AVCodecTag* const []) {
619	flv_video_codec_ids, flv_audio_codec_ids, 0
620	},
621	.flags = AVFMT_GLOBALHEADER \| AVFMT_VARIABLE_FPS \|
622	AVFMT_TS_NONSTRICT,
623	};