| /* |
| * 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" |
| #include "libavutil/opt.h" |
| #include "libavcodec/put_bits.h" |
| #include "libavcodec/aacenctab.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 { |
| AVClass *av_class; |
| int reserved; |
| int64_t duration_offset; |
| int64_t filesize_offset; |
| int64_t duration; |
| int64_t delay; ///< first dts delay (needed for AVC & Speex) |
| |
| AVCodecContext *audio_enc; |
| AVCodecContext *video_enc; |
| double framerate; |
| AVCodecContext *data_enc; |
| |
| int flags; |
| } 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 void write_metadata(AVFormatContext *s, unsigned int ts) |
| { |
| AVIOContext *pb = s->pb; |
| FLVContext *flv = s->priv_data; |
| int metadata_count = 0; |
| int64_t metadata_size_pos, data_size, metadata_count_pos; |
| AVDictionaryEntry *tag = NULL; |
| |
| /* 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, ts); // 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 * !!flv->video_enc + |
| 5 * !!flv->audio_enc + |
| 1 * !!flv->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 (flv->video_enc) { |
| put_amf_string(pb, "width"); |
| put_amf_double(pb, flv->video_enc->width); |
| |
| put_amf_string(pb, "height"); |
| put_amf_double(pb, flv->video_enc->height); |
| |
| put_amf_string(pb, "videodatarate"); |
| put_amf_double(pb, flv->video_enc->bit_rate / 1024.0); |
| |
| if (flv->framerate != 0.0) { |
| put_amf_string(pb, "framerate"); |
| put_amf_double(pb, flv->framerate); |
| metadata_count++; |
| } |
| |
| put_amf_string(pb, "videocodecid"); |
| put_amf_double(pb, flv->video_enc->codec_tag); |
| } |
| |
| if (flv->audio_enc) { |
| put_amf_string(pb, "audiodatarate"); |
| put_amf_double(pb, flv->audio_enc->bit_rate / 1024.0); |
| |
| put_amf_string(pb, "audiosamplerate"); |
| put_amf_double(pb, flv->audio_enc->sample_rate); |
| |
| put_amf_string(pb, "audiosamplesize"); |
| put_amf_double(pb, flv->audio_enc->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16); |
| |
| put_amf_string(pb, "stereo"); |
| put_amf_bool(pb, flv->audio_enc->channels == 2); |
| |
| put_amf_string(pb, "audiocodecid"); |
| put_amf_double(pb, flv->audio_enc->codec_tag); |
| } |
| |
| if (flv->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") |
| ||!strcmp(tag->key, "datasize") |
| ||!strcmp(tag->key, "lasttimestamp") |
| ||!strcmp(tag->key, "totalframes") |
| ||!strcmp(tag->key, "hasAudio") |
| ||!strcmp(tag->key, "hasVideo") |
| ||!strcmp(tag->key, "hasCuePoints") |
| ||!strcmp(tag->key, "hasMetadata") |
| ||!strcmp(tag->key, "hasKeyframes") |
| ){ |
| 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); |
| } |
| |
| static int unsupported_codec(AVFormatContext *s, |
| const char* type, int codec_id) |
| { |
| const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id); |
| av_log(s, AV_LOG_ERROR, |
| "%s codec %s not compatible with flv\n", |
| type, |
| desc ? desc->name : "unknown"); |
| return AVERROR(ENOSYS); |
| } |
| |
| static int flv_write_header(AVFormatContext *s) |
| { |
| int i; |
| AVIOContext *pb = s->pb; |
| FLVContext *flv = s->priv_data; |
| int64_t data_size; |
| |
| 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) { |
| flv->framerate = av_q2d(s->streams[i]->avg_frame_rate); |
| } |
| if (flv->video_enc) { |
| av_log(s, AV_LOG_ERROR, |
| "at most one video stream is supported in flv\n"); |
| return AVERROR(EINVAL); |
| } |
| flv->video_enc = enc; |
| if (!ff_codec_get_tag(flv_video_codec_ids, enc->codec_id)) |
| return unsupported_codec(s, "Video", enc->codec_id); |
| |
| if (enc->codec_id == AV_CODEC_ID_MPEG4 || |
| enc->codec_id == AV_CODEC_ID_H263) { |
| int error = s->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); |
| } |
| } else if (enc->codec_id == AV_CODEC_ID_VP6) { |
| av_log(s, AV_LOG_WARNING, |
| "Muxing VP6 in flv will produce flipped video on playback.\n"); |
| } |
| break; |
| case AVMEDIA_TYPE_AUDIO: |
| if (flv->audio_enc) { |
| av_log(s, AV_LOG_ERROR, |
| "at most one audio stream is supported in flv\n"); |
| return AVERROR(EINVAL); |
| } |
| flv->audio_enc = enc; |
| if (get_audio_flags(s, enc) < 0) |
| return unsupported_codec(s, "Audio", enc->codec_id); |
| 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 && enc->codec_id != AV_CODEC_ID_NONE) |
| return unsupported_codec(s, "Data", enc->codec_id); |
| flv->data_enc = enc; |
| break; |
| case AVMEDIA_TYPE_SUBTITLE: |
| if (enc->codec_id != AV_CODEC_ID_TEXT) { |
| av_log(s, AV_LOG_ERROR, "Subtitle codec '%s' for stream %d is not compatible with FLV\n", |
| avcodec_get_name(enc->codec_id), i); |
| return AVERROR_INVALIDDATA; |
| } |
| flv->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 * !!flv->audio_enc + |
| FLV_HEADER_FLAG_HASVIDEO * !!flv->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_metadata(s, 0); |
| |
| 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 |
| |
| if (!enc->extradata_size && flv->flags & 1) { |
| PutBitContext pbc; |
| int samplerate_index; |
| int channels = flv->audio_enc->channels - (flv->audio_enc->channels == 8 ? 1 : 0); |
| uint8_t data[2]; |
| |
| for (samplerate_index = 0; samplerate_index < 16; samplerate_index++) |
| if (flv->audio_enc->sample_rate == mpeg4audio_sample_rates[samplerate_index]) |
| break; |
| |
| init_put_bits(&pbc, data, sizeof(data)); |
| put_bits(&pbc, 5, flv->audio_enc->profile + 1); //profile |
| put_bits(&pbc, 4, samplerate_index); //sample rate index |
| put_bits(&pbc, 4, channels); |
| put_bits(&pbc, 1, 0); //frame length - 1024 samples |
| put_bits(&pbc, 1, 0); //does not depend on core coder |
| put_bits(&pbc, 1, 0); //is not extension |
| flush_put_bits(&pbc); |
| |
| avio_w8(pb, data[0]); |
| avio_w8(pb, data[1]); |
| |
| av_log(s, AV_LOG_WARNING, "AAC sequence header: %02x %02x.\n", data[0], data[1]); |
| } |
| 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; |
| |
| 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; |
| |
| if (s->event_flags & AVSTREAM_EVENT_FLAG_METADATA_UPDATED) { |
| write_metadata(s, ts); |
| s->event_flags &= ~AVSTREAM_EVENT_FLAG_METADATA_UPDATED; |
| } |
| |
| switch (enc->codec_type) { |
| case AVMEDIA_TYPE_VIDEO: |
| avio_w8(pb, FLV_TAG_TYPE_VIDEO); |
| |
| flags = ff_codec_get_tag(flv_video_codec_ids, enc->codec_id); |
| |
| 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_SUBTITLE: |
| 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 formatted */ |
| 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"); |
| } |
| |
| /* 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; |
| |
| if (size + flags_size >= 1<<24) { |
| av_log(s, AV_LOG_ERROR, "Too large packet with size %u >= %u\n", |
| size + flags_size, 1<<24); |
| return AVERROR(EINVAL); |
| } |
| |
| 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 || |
| enc->codec_type == AVMEDIA_TYPE_SUBTITLE ) { |
| int data_size; |
| int64_t metadata_size_pos = avio_tell(pb); |
| if (enc->codec_id == AV_CODEC_ID_TEXT) { |
| // legacy FFmpeg magic? |
| 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); |
| } else { |
| // just pass the metadata through |
| avio_write(pb, data ? data : pkt->data, size); |
| } |
| /* 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; |
| } |
| |
| static const AVOption options[] = { |
| { "flvflags", "FLV muxer flags", offsetof(FLVContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" }, |
| { "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "flvflags" }, |
| { NULL }, |
| }; |
| |
| static const AVClass flv_muxer_class = { |
| .class_name = "flv muxer", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| 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, |
| .priv_class = &flv_muxer_class, |
| }; |
