yading@11: /*
yading@11:  * FLV muxer
yading@11:  * Copyright (c) 2003 The FFmpeg Project
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "libavutil/intfloat.h"
yading@11: #include "libavutil/avassert.h"
yading@11: #include "avc.h"
yading@11: #include "avformat.h"
yading@11: #include "flv.h"
yading@11: #include "internal.h"
yading@11: #include "metadata.h"
yading@11: 
yading@11: 
yading@11: static const AVCodecTag flv_video_codec_ids[] = {
yading@11:     { AV_CODEC_ID_FLV1,     FLV_CODECID_H263 },
yading@11:     { AV_CODEC_ID_H263,     FLV_CODECID_REALH263 },
yading@11:     { AV_CODEC_ID_MPEG4,    FLV_CODECID_MPEG4 },
yading@11:     { AV_CODEC_ID_FLASHSV,  FLV_CODECID_SCREEN },
yading@11:     { AV_CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2 },
yading@11:     { AV_CODEC_ID_VP6F,     FLV_CODECID_VP6 },
yading@11:     { AV_CODEC_ID_VP6,      FLV_CODECID_VP6 },
yading@11:     { AV_CODEC_ID_VP6A,     FLV_CODECID_VP6A },
yading@11:     { AV_CODEC_ID_H264,     FLV_CODECID_H264 },
yading@11:     { AV_CODEC_ID_NONE,     0 }
yading@11: };
yading@11: 
yading@11: static const AVCodecTag flv_audio_codec_ids[] = {
yading@11:     { AV_CODEC_ID_MP3,        FLV_CODECID_MP3        >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_PCM_U8,     FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_PCM_S16BE,  FLV_CODECID_PCM        >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_PCM_S16LE,  FLV_CODECID_PCM_LE     >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_ADPCM_SWF,  FLV_CODECID_ADPCM      >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_AAC,        FLV_CODECID_AAC        >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_PCM_MULAW,  FLV_CODECID_PCM_MULAW  >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_PCM_ALAW,   FLV_CODECID_PCM_ALAW   >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_SPEEX,      FLV_CODECID_SPEEX      >> FLV_AUDIO_CODECID_OFFSET },
yading@11:     { AV_CODEC_ID_NONE,       0 }
yading@11: };
yading@11: 
yading@11: typedef struct FLVContext {
yading@11:     int     reserved;
yading@11:     int64_t duration_offset;
yading@11:     int64_t filesize_offset;
yading@11:     int64_t duration;
yading@11:     int64_t delay;      ///< first dts delay (needed for AVC & Speex)
yading@11: } FLVContext;
yading@11: 
yading@11: typedef struct FLVStreamContext {
yading@11:     int64_t last_ts;    ///< last timestamp for each stream
yading@11: } FLVStreamContext;
yading@11: 
yading@11: static int get_audio_flags(AVFormatContext *s, AVCodecContext *enc)
yading@11: {
yading@11:     int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT
yading@11:                                                    : FLV_SAMPLESSIZE_8BIT;
yading@11: 
yading@11:     if (enc->codec_id == AV_CODEC_ID_AAC) // specs force these parameters
yading@11:         return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ |
yading@11:                FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
yading@11:     else if (enc->codec_id == AV_CODEC_ID_SPEEX) {
yading@11:         if (enc->sample_rate != 16000) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "FLV only supports wideband (16kHz) Speex audio\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:         if (enc->channels != 1) {
yading@11:             av_log(s, AV_LOG_ERROR, "FLV only supports mono Speex audio\n");
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:         return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
yading@11:     } else {
yading@11:         switch (enc->sample_rate) {
yading@11:         case 44100:
yading@11:             flags |= FLV_SAMPLERATE_44100HZ;
yading@11:             break;
yading@11:         case 22050:
yading@11:             flags |= FLV_SAMPLERATE_22050HZ;
yading@11:             break;
yading@11:         case 11025:
yading@11:             flags |= FLV_SAMPLERATE_11025HZ;
yading@11:             break;
yading@11:         case 16000: // nellymoser only
yading@11:         case  8000: // nellymoser only
yading@11:         case  5512: // not MP3
yading@11:             if (enc->codec_id != AV_CODEC_ID_MP3) {
yading@11:                 flags |= FLV_SAMPLERATE_SPECIAL;
yading@11:                 break;
yading@11:             }
yading@11:         default:
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "FLV does not support sample rate %d, "
yading@11:                    "choose from (44100, 22050, 11025)\n", enc->sample_rate);
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (enc->channels > 1)
yading@11:         flags |= FLV_STEREO;
yading@11: 
yading@11:     switch (enc->codec_id) {
yading@11:     case AV_CODEC_ID_MP3:
yading@11:         flags |= FLV_CODECID_MP3    | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_PCM_U8:
yading@11:         flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_8BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_PCM_S16BE:
yading@11:         flags |= FLV_CODECID_PCM    | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_PCM_S16LE:
yading@11:         flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_ADPCM_SWF:
yading@11:         flags |= FLV_CODECID_ADPCM  | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_NELLYMOSER:
yading@11:         if (enc->sample_rate == 8000)
yading@11:             flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO  | FLV_SAMPLESSIZE_16BIT;
yading@11:         else if (enc->sample_rate == 16000)
yading@11:             flags |= FLV_CODECID_NELLYMOSER_16KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
yading@11:         else
yading@11:             flags |= FLV_CODECID_NELLYMOSER            | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_PCM_MULAW:
yading@11:         flags = FLV_CODECID_PCM_MULAW | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case AV_CODEC_ID_PCM_ALAW:
yading@11:         flags = FLV_CODECID_PCM_ALAW  | FLV_SAMPLERATE_SPECIAL | FLV_SAMPLESSIZE_16BIT;
yading@11:         break;
yading@11:     case 0:
yading@11:         flags |= enc->codec_tag << 4;
yading@11:         break;
yading@11:     default:
yading@11:         av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n",
yading@11:                avcodec_get_name(enc->codec_id));
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     return flags;
yading@11: }
yading@11: 
yading@11: static void put_amf_string(AVIOContext *pb, const char *str)
yading@11: {
yading@11:     size_t len = strlen(str);
yading@11:     avio_wb16(pb, len);
yading@11:     avio_write(pb, str, len);
yading@11: }
yading@11: 
yading@11: static void put_avc_eos_tag(AVIOContext *pb, unsigned ts)
yading@11: {
yading@11:     avio_w8(pb, FLV_TAG_TYPE_VIDEO);
yading@11:     avio_wb24(pb, 5);               /* Tag Data Size */
yading@11:     avio_wb24(pb, ts);              /* lower 24 bits of timestamp in ms */
yading@11:     avio_w8(pb, (ts >> 24) & 0x7F); /* MSB of ts in ms */
yading@11:     avio_wb24(pb, 0);               /* StreamId = 0 */
yading@11:     avio_w8(pb, 23);                /* ub[4] FrameType = 1, ub[4] CodecId = 7 */
yading@11:     avio_w8(pb, 2);                 /* AVC end of sequence */
yading@11:     avio_wb24(pb, 0);               /* Always 0 for AVC EOS. */
yading@11:     avio_wb32(pb, 16);              /* Size of FLV tag */
yading@11: }
yading@11: 
yading@11: static void put_amf_double(AVIOContext *pb, double d)
yading@11: {
yading@11:     avio_w8(pb, AMF_DATA_TYPE_NUMBER);
yading@11:     avio_wb64(pb, av_double2int(d));
yading@11: }
yading@11: 
yading@11: static void put_amf_bool(AVIOContext *pb, int b)
yading@11: {
yading@11:     avio_w8(pb, AMF_DATA_TYPE_BOOL);
yading@11:     avio_w8(pb, !!b);
yading@11: }
yading@11: 
yading@11: static int flv_write_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     FLVContext *flv = s->priv_data;
yading@11:     AVCodecContext *audio_enc = NULL, *video_enc = NULL, *data_enc = NULL;
yading@11:     int i, metadata_count = 0;
yading@11:     double framerate = 0.0;
yading@11:     int64_t metadata_size_pos, data_size, metadata_count_pos;
yading@11:     AVDictionaryEntry *tag = NULL;
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         AVCodecContext *enc = s->streams[i]->codec;
yading@11:         FLVStreamContext *sc;
yading@11:         switch (enc->codec_type) {
yading@11:         case AVMEDIA_TYPE_VIDEO:
yading@11:             if (s->streams[i]->avg_frame_rate.den &&
yading@11:                 s->streams[i]->avg_frame_rate.num) {
yading@11:                 framerate = av_q2d(s->streams[i]->avg_frame_rate);
yading@11:             } else {
yading@11:                 framerate = 1 / av_q2d(s->streams[i]->codec->time_base);
yading@11:             }
yading@11:             if (video_enc) {
yading@11:                 av_log(s, AV_LOG_ERROR,
yading@11:                        "at most one video stream is supported in flv\n");
yading@11:                 return AVERROR(EINVAL);
yading@11:             }
yading@11:             video_enc = enc;
yading@11:             if (enc->codec_tag == 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Video codec '%s' for stream %d is not compatible with FLV\n",
yading@11:                        avcodec_get_name(enc->codec_id), i);
yading@11:                 return AVERROR(EINVAL);
yading@11:             }
yading@11:             break;
yading@11:         case AVMEDIA_TYPE_AUDIO:
yading@11:             if (audio_enc) {
yading@11:                 av_log(s, AV_LOG_ERROR,
yading@11:                        "at most one audio stream is supported in flv\n");
yading@11:                 return AVERROR(EINVAL);
yading@11:             }
yading@11:             audio_enc = enc;
yading@11:             if (get_audio_flags(s, enc) < 0)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             break;
yading@11:         case AVMEDIA_TYPE_DATA:
yading@11:             if (enc->codec_id != AV_CODEC_ID_TEXT) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Data codec '%s' for stream %d is not compatible with FLV\n",
yading@11:                        avcodec_get_name(enc->codec_id), i);
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             data_enc = enc;
yading@11:             break;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_ERROR, "Codec type '%s' for stream %d is not compatible with FLV\n",
yading@11:                    av_get_media_type_string(enc->codec_type), i);
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11:         avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */
yading@11: 
yading@11:         sc = av_mallocz(sizeof(FLVStreamContext));
yading@11:         if (!sc)
yading@11:             return AVERROR(ENOMEM);
yading@11:         s->streams[i]->priv_data = sc;
yading@11:         sc->last_ts = -1;
yading@11:     }
yading@11: 
yading@11:     flv->delay = AV_NOPTS_VALUE;
yading@11: 
yading@11:     avio_write(pb, "FLV", 3);
yading@11:     avio_w8(pb, 1);
yading@11:     avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc +
yading@11:                 FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
yading@11:     avio_wb32(pb, 9);
yading@11:     avio_wb32(pb, 0);
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++)
yading@11:         if (s->streams[i]->codec->codec_tag == 5) {
yading@11:             avio_w8(pb, 8);     // message type
yading@11:             avio_wb24(pb, 0);   // include flags
yading@11:             avio_wb24(pb, 0);   // time stamp
yading@11:             avio_wb32(pb, 0);   // reserved
yading@11:             avio_wb32(pb, 11);  // size
yading@11:             flv->reserved = 5;
yading@11:         }
yading@11: 
yading@11:     /* write meta_tag */
yading@11:     avio_w8(pb, 18);            // tag type META
yading@11:     metadata_size_pos = avio_tell(pb);
yading@11:     avio_wb24(pb, 0);           // size of data part (sum of all parts below)
yading@11:     avio_wb24(pb, 0);           // timestamp
yading@11:     avio_wb32(pb, 0);           // reserved
yading@11: 
yading@11:     /* now data of data_size size */
yading@11: 
yading@11:     /* first event name as a string */
yading@11:     avio_w8(pb, AMF_DATA_TYPE_STRING);
yading@11:     put_amf_string(pb, "onMetaData"); // 12 bytes
yading@11: 
yading@11:     /* mixed array (hash) with size and string/type/data tuples */
yading@11:     avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
yading@11:     metadata_count_pos = avio_tell(pb);
yading@11:     metadata_count = 5 * !!video_enc +
yading@11:                      5 * !!audio_enc +
yading@11:                      1 * !!data_enc  +
yading@11:                      2; // +2 for duration and file size
yading@11: 
yading@11:     avio_wb32(pb, metadata_count);
yading@11: 
yading@11:     put_amf_string(pb, "duration");
yading@11:     flv->duration_offset= avio_tell(pb);
yading@11: 
yading@11:     // fill in the guessed duration, it'll be corrected later if incorrect
yading@11:     put_amf_double(pb, s->duration / AV_TIME_BASE);
yading@11: 
yading@11:     if (video_enc) {
yading@11:         put_amf_string(pb, "width");
yading@11:         put_amf_double(pb, video_enc->width);
yading@11: 
yading@11:         put_amf_string(pb, "height");
yading@11:         put_amf_double(pb, video_enc->height);
yading@11: 
yading@11:         put_amf_string(pb, "videodatarate");
yading@11:         put_amf_double(pb, video_enc->bit_rate / 1024.0);
yading@11: 
yading@11:         put_amf_string(pb, "framerate");
yading@11:         put_amf_double(pb, framerate);
yading@11: 
yading@11:         put_amf_string(pb, "videocodecid");
yading@11:         put_amf_double(pb, video_enc->codec_tag);
yading@11:     }
yading@11: 
yading@11:     if (audio_enc) {
yading@11:         put_amf_string(pb, "audiodatarate");
yading@11:         put_amf_double(pb, audio_enc->bit_rate / 1024.0);
yading@11: 
yading@11:         put_amf_string(pb, "audiosamplerate");
yading@11:         put_amf_double(pb, audio_enc->sample_rate);
yading@11: 
yading@11:         put_amf_string(pb, "audiosamplesize");
yading@11:         put_amf_double(pb, audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16);
yading@11: 
yading@11:         put_amf_string(pb, "stereo");
yading@11:         put_amf_bool(pb, audio_enc->channels == 2);
yading@11: 
yading@11:         put_amf_string(pb, "audiocodecid");
yading@11:         put_amf_double(pb, audio_enc->codec_tag);
yading@11:     }
yading@11: 
yading@11:     if (data_enc) {
yading@11:         put_amf_string(pb, "datastream");
yading@11:         put_amf_double(pb, 0.0);
yading@11:     }
yading@11: 
yading@11:     while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
yading@11:         if(   !strcmp(tag->key, "width")
yading@11:             ||!strcmp(tag->key, "height")
yading@11:             ||!strcmp(tag->key, "videodatarate")
yading@11:             ||!strcmp(tag->key, "framerate")
yading@11:             ||!strcmp(tag->key, "videocodecid")
yading@11:             ||!strcmp(tag->key, "audiodatarate")
yading@11:             ||!strcmp(tag->key, "audiosamplerate")
yading@11:             ||!strcmp(tag->key, "audiosamplesize")
yading@11:             ||!strcmp(tag->key, "stereo")
yading@11:             ||!strcmp(tag->key, "audiocodecid")
yading@11:             ||!strcmp(tag->key, "duration")
yading@11:             ||!strcmp(tag->key, "onMetaData")
yading@11:         ){
yading@11:             av_log(s, AV_LOG_DEBUG, "Ignoring metadata for %s\n", tag->key);
yading@11:             continue;
yading@11:         }
yading@11:         put_amf_string(pb, tag->key);
yading@11:         avio_w8(pb, AMF_DATA_TYPE_STRING);
yading@11:         put_amf_string(pb, tag->value);
yading@11:         metadata_count++;
yading@11:     }
yading@11: 
yading@11:     put_amf_string(pb, "filesize");
yading@11:     flv->filesize_offset = avio_tell(pb);
yading@11:     put_amf_double(pb, 0); // delayed write
yading@11: 
yading@11:     put_amf_string(pb, "");
yading@11:     avio_w8(pb, AMF_END_OF_OBJECT);
yading@11: 
yading@11:     /* write total size of tag */
yading@11:     data_size = avio_tell(pb) - metadata_size_pos - 10;
yading@11: 
yading@11:     avio_seek(pb, metadata_count_pos, SEEK_SET);
yading@11:     avio_wb32(pb, metadata_count);
yading@11: 
yading@11:     avio_seek(pb, metadata_size_pos, SEEK_SET);
yading@11:     avio_wb24(pb, data_size);
yading@11:     avio_skip(pb, data_size + 10 - 3);
yading@11:     avio_wb32(pb, data_size + 11);
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         AVCodecContext *enc = s->streams[i]->codec;
yading@11:         if (enc->codec_id == AV_CODEC_ID_AAC || enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
yading@11:             int64_t pos;
yading@11:             avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
yading@11:                     FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
yading@11:             avio_wb24(pb, 0); // size patched later
yading@11:             avio_wb24(pb, 0); // ts
yading@11:             avio_w8(pb, 0);   // ts ext
yading@11:             avio_wb24(pb, 0); // streamid
yading@11:             pos = avio_tell(pb);
yading@11:             if (enc->codec_id == AV_CODEC_ID_AAC) {
yading@11:                 avio_w8(pb, get_audio_flags(s, enc));
yading@11:                 avio_w8(pb, 0); // AAC sequence header
yading@11:                 avio_write(pb, enc->extradata, enc->extradata_size);
yading@11:             } else {
yading@11:                 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY); // flags
yading@11:                 avio_w8(pb, 0); // AVC sequence header
yading@11:                 avio_wb24(pb, 0); // composition time
yading@11:                 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
yading@11:             }
yading@11:             data_size = avio_tell(pb) - pos;
yading@11:             avio_seek(pb, -data_size - 10, SEEK_CUR);
yading@11:             avio_wb24(pb, data_size);
yading@11:             avio_skip(pb, data_size + 10 - 3);
yading@11:             avio_wb32(pb, data_size + 11); // previous tag size
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int flv_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     int64_t file_size;
yading@11: 
yading@11:     AVIOContext *pb = s->pb;
yading@11:     FLVContext *flv = s->priv_data;
yading@11:     int i;
yading@11: 
yading@11:     /* Add EOS tag */
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         AVCodecContext *enc = s->streams[i]->codec;
yading@11:         FLVStreamContext *sc = s->streams[i]->priv_data;
yading@11:         if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
yading@11:                 (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4))
yading@11:             put_avc_eos_tag(pb, sc->last_ts);
yading@11:     }
yading@11: 
yading@11:     file_size = avio_tell(pb);
yading@11: 
yading@11:     /* update information */
yading@11:     if (avio_seek(pb, flv->duration_offset, SEEK_SET) < 0)
yading@11:         av_log(s, AV_LOG_WARNING, "Failed to update header with correct duration.\n");
yading@11:     else
yading@11:         put_amf_double(pb, flv->duration / (double)1000);
yading@11:     if (avio_seek(pb, flv->filesize_offset, SEEK_SET) < 0)
yading@11:         av_log(s, AV_LOG_WARNING, "Failed to update header with correct filesize.\n");
yading@11:     else
yading@11:         put_amf_double(pb, file_size);
yading@11: 
yading@11:     avio_seek(pb, file_size, SEEK_SET);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AVIOContext *pb      = s->pb;
yading@11:     AVCodecContext *enc  = s->streams[pkt->stream_index]->codec;
yading@11:     FLVContext *flv      = s->priv_data;
yading@11:     FLVStreamContext *sc = s->streams[pkt->stream_index]->priv_data;
yading@11:     unsigned ts;
yading@11:     int size = pkt->size;
yading@11:     uint8_t *data = NULL;
yading@11:     int flags = -1, flags_size, ret;
yading@11: 
yading@11:     if (enc->codec_id == AV_CODEC_ID_VP6 || enc->codec_id == AV_CODEC_ID_VP6F ||
yading@11:         enc->codec_id == AV_CODEC_ID_VP6A || enc->codec_id == AV_CODEC_ID_AAC)
yading@11:         flags_size = 2;
yading@11:     else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4)
yading@11:         flags_size = 5;
yading@11:     else
yading@11:         flags_size = 1;
yading@11: 
yading@11:     switch (enc->codec_type) {
yading@11:     case AVMEDIA_TYPE_VIDEO:
yading@11:         avio_w8(pb, FLV_TAG_TYPE_VIDEO);
yading@11: 
yading@11:         flags = enc->codec_tag;
yading@11:         if (flags == 0) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "Video codec '%s' is not compatible with FLV\n",
yading@11:                    avcodec_get_name(enc->codec_id));
yading@11:             return AVERROR(EINVAL);
yading@11:         }
yading@11: 
yading@11:         flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
yading@11:         break;
yading@11:     case AVMEDIA_TYPE_AUDIO:
yading@11:         flags = get_audio_flags(s, enc);
yading@11: 
yading@11:         av_assert0(size);
yading@11: 
yading@11:         avio_w8(pb, FLV_TAG_TYPE_AUDIO);
yading@11:         break;
yading@11:     case AVMEDIA_TYPE_DATA:
yading@11:         avio_w8(pb, FLV_TAG_TYPE_META);
yading@11:         break;
yading@11:     default:
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
yading@11:         /* check if extradata looks like mp4 formated */
yading@11:         if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1)
yading@11:             if ((ret = ff_avc_parse_nal_units_buf(pkt->data, &data, &size)) < 0)
yading@11:                 return ret;
yading@11:     } else if (enc->codec_id == AV_CODEC_ID_AAC && pkt->size > 2 &&
yading@11:                (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) {
yading@11:         if (!s->streams[pkt->stream_index]->nb_frames) {
yading@11:         av_log(s, AV_LOG_ERROR, "Malformed AAC bitstream detected: "
yading@11:                "use audio bitstream filter 'aac_adtstoasc' to fix it "
yading@11:                "('-bsf:a aac_adtstoasc' option with ffmpeg)\n");
yading@11:         return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         av_log(s, AV_LOG_WARNING, "aac bitstream error\n");
yading@11:     }
yading@11: 
yading@11:     if (flv->delay == AV_NOPTS_VALUE)
yading@11:         flv->delay = -pkt->dts;
yading@11: 
yading@11:     if (pkt->dts < -flv->delay) {
yading@11:         av_log(s, AV_LOG_WARNING,
yading@11:                "Packets are not in the proper order with respect to DTS\n");
yading@11:         return AVERROR(EINVAL);
yading@11:     }
yading@11: 
yading@11:     ts = pkt->dts + flv->delay; // add delay to force positive dts
yading@11: 
yading@11:     /* check Speex packet duration */
yading@11:     if (enc->codec_id == AV_CODEC_ID_SPEEX && ts - sc->last_ts > 160)
yading@11:         av_log(s, AV_LOG_WARNING, "Warning: Speex stream has more than "
yading@11:                                   "8 frames per packet. Adobe Flash "
yading@11:                                   "Player cannot handle this!\n");
yading@11: 
yading@11:     if (sc->last_ts < ts)
yading@11:         sc->last_ts = ts;
yading@11: 
yading@11:     avio_wb24(pb, size + flags_size);
yading@11:     avio_wb24(pb, ts);
yading@11:     avio_w8(pb, (ts >> 24) & 0x7F); // timestamps are 32 bits _signed_
yading@11:     avio_wb24(pb, flv->reserved);
yading@11: 
yading@11:     if (enc->codec_type == AVMEDIA_TYPE_DATA) {
yading@11:         int data_size;
yading@11:         int metadata_size_pos = avio_tell(pb);
yading@11:         avio_w8(pb, AMF_DATA_TYPE_STRING);
yading@11:         put_amf_string(pb, "onTextData");
yading@11:         avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
yading@11:         avio_wb32(pb, 2);
yading@11:         put_amf_string(pb, "type");
yading@11:         avio_w8(pb, AMF_DATA_TYPE_STRING);
yading@11:         put_amf_string(pb, "Text");
yading@11:         put_amf_string(pb, "text");
yading@11:         avio_w8(pb, AMF_DATA_TYPE_STRING);
yading@11:         put_amf_string(pb, pkt->data);
yading@11:         put_amf_string(pb, "");
yading@11:         avio_w8(pb, AMF_END_OF_OBJECT);
yading@11:         /* write total size of tag */
yading@11:         data_size = avio_tell(pb) - metadata_size_pos;
yading@11:         avio_seek(pb, metadata_size_pos - 10, SEEK_SET);
yading@11:         avio_wb24(pb, data_size);
yading@11:         avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
yading@11:         avio_wb32(pb, data_size + 11);
yading@11:     } else {
yading@11:         av_assert1(flags>=0);
yading@11:         avio_w8(pb,flags);
yading@11:         if (enc->codec_id == AV_CODEC_ID_VP6)
yading@11:             avio_w8(pb,0);
yading@11:         if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A)
yading@11:             avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
yading@11:         else if (enc->codec_id == AV_CODEC_ID_AAC)
yading@11:             avio_w8(pb,1); // AAC raw
yading@11:         else if (enc->codec_id == AV_CODEC_ID_H264 || enc->codec_id == AV_CODEC_ID_MPEG4) {
yading@11:             avio_w8(pb,1); // AVC NALU
yading@11:             avio_wb24(pb,pkt->pts - pkt->dts);
yading@11:         }
yading@11: 
yading@11:         avio_write(pb, data ? data : pkt->data, size);
yading@11: 
yading@11:         avio_wb32(pb, size + flags_size + 11); // previous tag size
yading@11:         flv->duration = FFMAX(flv->duration,
yading@11:                               pkt->pts + flv->delay + pkt->duration);
yading@11:     }
yading@11: 
yading@11:     av_free(data);
yading@11: 
yading@11:     return pb->error;
yading@11: }
yading@11: 
yading@11: AVOutputFormat ff_flv_muxer = {
yading@11:     .name           = "flv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
yading@11:     .mime_type      = "video/x-flv",
yading@11:     .extensions     = "flv",
yading@11:     .priv_data_size = sizeof(FLVContext),
yading@11:     .audio_codec    = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF,
yading@11:     .video_codec    = AV_CODEC_ID_FLV1,
yading@11:     .write_header   = flv_write_header,
yading@11:     .write_packet   = flv_write_packet,
yading@11:     .write_trailer  = flv_write_trailer,
yading@11:     .codec_tag      = (const AVCodecTag* const []) {
yading@11:                           flv_video_codec_ids, flv_audio_codec_ids, 0
yading@11:                       },
yading@11:     .flags          = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS |
yading@11:                       AVFMT_TS_NONSTRICT,
yading@11: };