/* * 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 "libavutil/mastering_display_metadata.h" #include "libavutil/mathematics.h" #include "libavutil/mem.h" #include "libavcodec/codec_desc.h" #include "libavcodec/mpeg4audio.h" #include "avio.h" #include "avc.h" #include "av1.h" #include "vpcc.h" #include "hevc.h" #include "avformat.h" #include "flv.h" #include "internal.h" #include "nal.h" #include "mux.h" #include "libavutil/opt.h" #include "libavcodec/put_bits.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_HEVC, MKBETAG('h', 'v', 'c', '1') }, { AV_CODEC_ID_AV1, MKBETAG('a', 'v', '0', '1') }, { AV_CODEC_ID_VP9, MKBETAG('v', 'p', '0', '9') }, { 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 enum { FLV_AAC_SEQ_HEADER_DETECT = (1 << 0), FLV_NO_SEQUENCE_END = (1 << 1), FLV_ADD_KEYFRAME_INDEX = (1 << 2), FLV_NO_METADATA = (1 << 3), FLV_NO_DURATION_FILESIZE = (1 << 4), } FLVFlags; typedef struct FLVFileposition { int64_t keyframe_position; double keyframe_timestamp; struct FLVFileposition *next; } FLVFileposition; 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) int64_t datastart_offset; int64_t datasize_offset; int64_t datasize; int64_t videosize_offset; int64_t videosize; int64_t audiosize_offset; int64_t audiosize; int64_t metadata_size_pos; int64_t metadata_totalsize_pos; int64_t metadata_totalsize; int64_t keyframe_index_size; int64_t lasttimestamp_offset; double lasttimestamp; int64_t lastkeyframetimestamp_offset; double lastkeyframetimestamp; int64_t lastkeyframelocation_offset; int64_t lastkeyframelocation; int64_t keyframes_info_offset; int64_t filepositions_count; FLVFileposition *filepositions; FLVFileposition *head_filepositions; AVCodecParameters *audio_par; AVCodecParameters *video_par; double framerate; AVCodecParameters *data_par; int flags; int64_t last_ts[FLV_STREAM_TYPE_NB]; int metadata_pkt_written; } FLVContext; static int get_audio_flags(AVFormatContext *s, AVCodecParameters *par) { int flags = (par->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT; if (par->codec_id == AV_CODEC_ID_AAC) // specs force these parameters return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO; else if (par->codec_id == AV_CODEC_ID_SPEEX) { if (par->sample_rate != 16000) { av_log(s, AV_LOG_ERROR, "FLV only supports wideband (16kHz) Speex audio\n"); return AVERROR(EINVAL); } if (par->ch_layout.nb_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 (par->sample_rate) { case 48000: // 48khz mp3 is stored with 44k1 samplerate identifer if (par->codec_id == AV_CODEC_ID_MP3) { flags |= FLV_SAMPLERATE_44100HZ; break; } else { goto error; } 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 (par->codec_id != AV_CODEC_ID_MP3) { flags |= FLV_SAMPLERATE_SPECIAL; break; } default: error: av_log(s, AV_LOG_ERROR, "FLV does not support sample rate %d, " "choose from (44100, 22050, 11025)\n", par->sample_rate); return AVERROR(EINVAL); } } if (par->ch_layout.nb_channels > 1) flags |= FLV_STEREO; switch (par->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 (par->sample_rate == 8000) flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT; else if (par->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_SAMPLESSIZE_16BIT; break; case AV_CODEC_ID_PCM_ALAW: flags |= FLV_CODECID_PCM_ALAW | FLV_SAMPLESSIZE_16BIT; break; case 0: flags |= par->codec_tag << 4; break; default: av_log(s, AV_LOG_ERROR, "Audio codec '%s' not compatible with FLV\n", avcodec_get_name(par->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); // Avoid avio_write() if put_amf_string(pb, "") is inlined. if (av_builtin_constant_p(len == 0) && len == 0) return; avio_write(pb, str, len); } // FLV timestamps are 32 bits signed, RTMP timestamps should be 32-bit unsigned static void put_timestamp(AVIOContext *pb, int64_t ts) { avio_wb24(pb, ts & 0xFFFFFF); avio_w8(pb, (ts >> 24) & 0x7F); } static void put_eos_tag(AVIOContext *pb, unsigned ts, enum AVCodecID codec_id) { uint32_t tag = ff_codec_get_tag(flv_video_codec_ids, codec_id); /* ub[4] FrameType = 1, ub[4] CodecId */ tag |= 1 << 4; avio_w8(pb, FLV_TAG_TYPE_VIDEO); avio_wb24(pb, 5); /* Tag Data Size */ put_timestamp(pb, ts); avio_wb24(pb, 0); /* StreamId = 0 */ avio_w8(pb, tag); 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_byte(AVIOContext *pb, unsigned char abyte) { avio_w8(pb, abyte); } static void put_amf_dword_array(AVIOContext *pb, uint32_t dw) { avio_w8(pb, AMF_DATA_TYPE_ARRAY); avio_wb32(pb, dw); } 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 write_duration_filesize = !(flv->flags & FLV_NO_DURATION_FILESIZE); int metadata_count = 0; int64_t metadata_count_pos; const AVDictionaryEntry *tag = NULL; /* write meta_tag */ avio_w8(pb, FLV_TAG_TYPE_META); // tag type META flv->metadata_size_pos = avio_tell(pb); avio_wb24(pb, 0); // size of data part (sum of all parts below) put_timestamp(pb, ts); // timestamp avio_wb24(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_par + 5 * !!flv->audio_par + 1 * !!flv->data_par; if (write_duration_filesize) { metadata_count += 2; // +2 for duration and file size } avio_wb32(pb, metadata_count); if (write_duration_filesize) { 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_par) { put_amf_string(pb, "width"); put_amf_double(pb, flv->video_par->width); put_amf_string(pb, "height"); put_amf_double(pb, flv->video_par->height); put_amf_string(pb, "videodatarate"); put_amf_double(pb, flv->video_par->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_par->codec_tag); } if (flv->audio_par) { put_amf_string(pb, "audiodatarate"); put_amf_double(pb, flv->audio_par->bit_rate / 1024.0); put_amf_string(pb, "audiosamplerate"); put_amf_double(pb, flv->audio_par->sample_rate); put_amf_string(pb, "audiosamplesize"); put_amf_double(pb, flv->audio_par->codec_id == AV_CODEC_ID_PCM_U8 ? 8 : 16); put_amf_string(pb, "stereo"); put_amf_bool(pb, flv->audio_par->ch_layout.nb_channels == 2); put_amf_string(pb, "audiocodecid"); put_amf_double(pb, flv->audio_par->codec_tag); } if (flv->data_par) { put_amf_string(pb, "datastream"); put_amf_double(pb, 0.0); } ff_standardize_creation_time(s); while ((tag = av_dict_iterate(s->metadata, tag))) { 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++; } if (write_duration_filesize) { put_amf_string(pb, "filesize"); flv->filesize_offset = avio_tell(pb); put_amf_double(pb, 0); // delayed write } if (flv->flags & FLV_ADD_KEYFRAME_INDEX) { flv->keyframe_index_size = 0; put_amf_string(pb, "hasVideo"); put_amf_bool(pb, !!flv->video_par); metadata_count++; put_amf_string(pb, "hasKeyframes"); put_amf_bool(pb, 1); metadata_count++; put_amf_string(pb, "hasAudio"); put_amf_bool(pb, !!flv->audio_par); metadata_count++; put_amf_string(pb, "hasMetadata"); put_amf_bool(pb, 1); metadata_count++; put_amf_string(pb, "canSeekToEnd"); put_amf_bool(pb, 1); metadata_count++; put_amf_string(pb, "datasize"); flv->datasize_offset = avio_tell(pb); flv->datasize = 0; put_amf_double(pb, flv->datasize); metadata_count++; put_amf_string(pb, "videosize"); flv->videosize_offset = avio_tell(pb); flv->videosize = 0; put_amf_double(pb, flv->videosize); metadata_count++; put_amf_string(pb, "audiosize"); flv->audiosize_offset = avio_tell(pb); flv->audiosize = 0; put_amf_double(pb, flv->audiosize); metadata_count++; put_amf_string(pb, "lasttimestamp"); flv->lasttimestamp_offset = avio_tell(pb); flv->lasttimestamp = 0; put_amf_double(pb, 0); metadata_count++; put_amf_string(pb, "lastkeyframetimestamp"); flv->lastkeyframetimestamp_offset = avio_tell(pb); flv->lastkeyframetimestamp = 0; put_amf_double(pb, 0); metadata_count++; put_amf_string(pb, "lastkeyframelocation"); flv->lastkeyframelocation_offset = avio_tell(pb); flv->lastkeyframelocation = 0; put_amf_double(pb, 0); metadata_count++; put_amf_string(pb, "keyframes"); put_amf_byte(pb, AMF_DATA_TYPE_OBJECT); metadata_count++; flv->keyframes_info_offset = avio_tell(pb); } put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); /* write total size of tag */ flv->metadata_totalsize = avio_tell(pb) - flv->metadata_size_pos - 10; avio_seek(pb, metadata_count_pos, SEEK_SET); avio_wb32(pb, metadata_count); avio_seek(pb, flv->metadata_size_pos, SEEK_SET); avio_wb24(pb, flv->metadata_totalsize); avio_skip(pb, flv->metadata_totalsize + 10 - 3); flv->metadata_totalsize_pos = avio_tell(pb); avio_wb32(pb, flv->metadata_totalsize + 11); } static void flv_write_metadata_packet(AVFormatContext *s, AVCodecParameters *par, unsigned int ts) { AVIOContext *pb = s->pb; FLVContext *flv = s->priv_data; AVContentLightMetadata *lightMetadata = NULL; AVMasteringDisplayMetadata *displayMetadata = NULL; int64_t metadata_size_pos = 0; int64_t total_size = 0; const AVPacketSideData *side_data = NULL; if (flv->metadata_pkt_written) return; if (par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { int flags_size = 5; side_data = av_packet_side_data_get(par->coded_side_data, par->nb_coded_side_data, AV_PKT_DATA_CONTENT_LIGHT_LEVEL); if (side_data) lightMetadata = (AVContentLightMetadata *)side_data->data; side_data = av_packet_side_data_get(par->coded_side_data, par->nb_coded_side_data, AV_PKT_DATA_MASTERING_DISPLAY_METADATA); if (side_data) displayMetadata = (AVMasteringDisplayMetadata *)side_data->data; /* * Reference Enhancing FLV * https://github.com/veovera/enhanced-rtmp/blob/main/enhanced-rtmp.pdf * */ avio_w8(pb, FLV_TAG_TYPE_VIDEO); //write video tag type metadata_size_pos = avio_tell(pb); avio_wb24(pb, 0 + flags_size); put_timestamp(pb, ts); //ts = pkt->dts, gen avio_wb24(pb, flv->reserved); if (par->codec_id == AV_CODEC_ID_HEVC) { avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeMetadata| FLV_FRAME_VIDEO_INFO_CMD); // ExVideoTagHeader mode with PacketTypeMetadata avio_write(pb, "hvc1", 4); } else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeMetadata| FLV_FRAME_VIDEO_INFO_CMD); avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4); } avio_w8(pb, AMF_DATA_TYPE_STRING); put_amf_string(pb, "colorInfo"); avio_w8(pb, AMF_DATA_TYPE_OBJECT); put_amf_string(pb, "colorConfig"); // colorConfig avio_w8(pb, AMF_DATA_TYPE_OBJECT); if (par->color_trc != AVCOL_TRC_UNSPECIFIED && par->color_trc < AVCOL_TRC_NB) { put_amf_string(pb, "transferCharacteristics"); // color_trc put_amf_double(pb, par->color_trc); } if (par->color_space != AVCOL_SPC_UNSPECIFIED && par->color_space < AVCOL_SPC_NB) { put_amf_string(pb, "matrixCoefficients"); // colorspace put_amf_double(pb, par->color_space); } if (par->color_primaries != AVCOL_PRI_UNSPECIFIED && par->color_primaries < AVCOL_PRI_NB) { put_amf_string(pb, "colorPrimaries"); // color_primaries put_amf_double(pb, par->color_primaries); } put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); if (lightMetadata) { put_amf_string(pb, "hdrCll"); avio_w8(pb, AMF_DATA_TYPE_OBJECT); put_amf_string(pb, "maxFall"); put_amf_double(pb, lightMetadata->MaxFALL); put_amf_string(pb, "maxCLL"); put_amf_double(pb, lightMetadata->MaxCLL); put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); } if (displayMetadata && (displayMetadata->has_primaries || displayMetadata->has_luminance)) { put_amf_string(pb, "hdrMdcv"); avio_w8(pb, AMF_DATA_TYPE_OBJECT); if (displayMetadata->has_primaries) { put_amf_string(pb, "redX"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[0][0])); put_amf_string(pb, "redY"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[0][1])); put_amf_string(pb, "greenX"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[1][0])); put_amf_string(pb, "greenY"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[1][1])); put_amf_string(pb, "blueX"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[2][0])); put_amf_string(pb, "blueY"); put_amf_double(pb, av_q2d(displayMetadata->display_primaries[2][1])); put_amf_string(pb, "whitePointX"); put_amf_double(pb, av_q2d(displayMetadata->white_point[0])); put_amf_string(pb, "whitePointY"); put_amf_double(pb, av_q2d(displayMetadata->white_point[1])); } if (displayMetadata->has_luminance) { put_amf_string(pb, "maxLuminance"); put_amf_double(pb, av_q2d(displayMetadata->max_luminance)); put_amf_string(pb, "minLuminance"); put_amf_double(pb, av_q2d(displayMetadata->min_luminance)); } put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); } put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); total_size = avio_tell(pb) - metadata_size_pos - 10; avio_seek(pb, metadata_size_pos, SEEK_SET); avio_wb24(pb, total_size); avio_skip(pb, total_size + 10 - 3); avio_wb32(pb, total_size + 11); // previous tag size flv->metadata_pkt_written = 1; } } 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 void flv_write_codec_header(AVFormatContext* s, AVCodecParameters* par, int64_t ts) { int64_t data_size; AVIOContext *pb = s->pb; FLVContext *flv = s->priv_data; if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { int64_t pos; avio_w8(pb, par->codec_type == AVMEDIA_TYPE_VIDEO ? FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO); avio_wb24(pb, 0); // size patched later put_timestamp(pb, ts); avio_wb24(pb, 0); // streamid pos = avio_tell(pb); if (par->codec_id == AV_CODEC_ID_AAC) { avio_w8(pb, get_audio_flags(s, par)); avio_w8(pb, 0); // AAC sequence header if (!par->extradata_size && (flv->flags & FLV_AAC_SEQ_HEADER_DETECT)) { PutBitContext pbc; int samplerate_index; int channels = par->ch_layout.nb_channels - (par->ch_layout.nb_channels == 8 ? 1 : 0); uint8_t data[2]; for (samplerate_index = 0; samplerate_index < 16; samplerate_index++) if (par->sample_rate == ff_mpeg4audio_sample_rates[samplerate_index]) break; init_put_bits(&pbc, data, sizeof(data)); put_bits(&pbc, 5, par->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, par->extradata, par->extradata_size); } else { if (par->codec_id == AV_CODEC_ID_HEVC) { avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart | FLV_FRAME_KEY); // ExVideoTagHeader mode with PacketTypeSequenceStart avio_write(pb, "hvc1", 4); } else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeSequenceStart | FLV_FRAME_KEY); avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4); } else { avio_w8(pb, par->codec_tag | FLV_FRAME_KEY); // flags avio_w8(pb, 0); // AVC sequence header avio_wb24(pb, 0); // composition time } if (par->codec_id == AV_CODEC_ID_HEVC) ff_isom_write_hvcc(pb, par->extradata, par->extradata_size, 0, s); else if (par->codec_id == AV_CODEC_ID_AV1) ff_isom_write_av1c(pb, par->extradata, par->extradata_size, 1); else if (par->codec_id == AV_CODEC_ID_VP9) ff_isom_write_vpcc(s, pb, par->extradata, par->extradata_size, par); else ff_isom_write_avcc(pb, par->extradata, par->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 } } static int flv_append_keyframe_info(AVFormatContext *s, FLVContext *flv, double ts, int64_t pos) { FLVFileposition *position = av_malloc(sizeof(FLVFileposition)); if (!position) { av_log(s, AV_LOG_WARNING, "no mem for add keyframe index!\n"); return AVERROR(ENOMEM); } position->keyframe_timestamp = ts; position->keyframe_position = pos; if (!flv->filepositions_count) { flv->filepositions = position; flv->head_filepositions = flv->filepositions; position->next = NULL; } else { flv->filepositions->next = position; position->next = NULL; flv->filepositions = flv->filepositions->next; } flv->filepositions_count++; return 0; } static int shift_data(AVFormatContext *s) { int ret; int64_t metadata_size = 0; FLVContext *flv = s->priv_data; metadata_size = flv->filepositions_count * 9 * 2 + 10; /* filepositions and times value */ metadata_size += 2 + 13; /* filepositions String */ metadata_size += 2 + 5; /* times String */ metadata_size += 3; /* Object end */ flv->keyframe_index_size = metadata_size; if (metadata_size < 0) return metadata_size; ret = ff_format_shift_data(s, flv->keyframes_info_offset, metadata_size); if (ret < 0) return ret; avio_seek(s->pb, flv->metadata_size_pos, SEEK_SET); avio_wb24(s->pb, flv->metadata_totalsize + metadata_size); avio_seek(s->pb, flv->metadata_totalsize_pos + metadata_size, SEEK_SET); avio_wb32(s->pb, flv->metadata_totalsize + 11 + metadata_size); return 0; } static int flv_init(struct AVFormatContext *s) { int i; FLVContext *flv = s->priv_data; if (s->nb_streams > FLV_STREAM_TYPE_NB) { av_log(s, AV_LOG_ERROR, "invalid number of streams %d\n", s->nb_streams); return AVERROR(EINVAL); } for (i = 0; i < s->nb_streams; i++) { AVCodecParameters *par = s->streams[i]->codecpar; switch (par->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_par) { av_log(s, AV_LOG_ERROR, "at most one video stream is supported in flv\n"); return AVERROR(EINVAL); } flv->video_par = par; if (!ff_codec_get_tag(flv_video_codec_ids, par->codec_id)) return unsupported_codec(s, "Video", par->codec_id); if (par->codec_id == AV_CODEC_ID_MPEG4 || par->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(par->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 (par->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_par) { av_log(s, AV_LOG_ERROR, "at most one audio stream is supported in flv\n"); return AVERROR(EINVAL); } flv->audio_par = par; if (get_audio_flags(s, par) < 0) return unsupported_codec(s, "Audio", par->codec_id); if (par->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 (par->codec_id != AV_CODEC_ID_TEXT && par->codec_id != AV_CODEC_ID_NONE) return unsupported_codec(s, "Data", par->codec_id); flv->data_par = par; break; case AVMEDIA_TYPE_SUBTITLE: if (par->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(par->codec_id), i); return AVERROR_INVALIDDATA; } flv->data_par = par; 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(par->codec_type), i); return AVERROR(EINVAL); } avpriv_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */ flv->last_ts[i] = -1; } flv->delay = AV_NOPTS_VALUE; return 0; } static int flv_write_header(AVFormatContext *s) { int i; AVIOContext *pb = s->pb; FLVContext *flv = s->priv_data; avio_write(pb, "FLV", 3); avio_w8(pb, 1); avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!flv->audio_par + FLV_HEADER_FLAG_HASVIDEO * !!flv->video_par); avio_wb32(pb, 9); avio_wb32(pb, 0); for (i = 0; i < s->nb_streams; i++) if (s->streams[i]->codecpar->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; } if (flv->flags & FLV_NO_METADATA) { pb->seekable = 0; } else { write_metadata(s, 0); } for (i = 0; i < s->nb_streams; i++) { flv_write_codec_header(s, s->streams[i]->codecpar, 0); } flv->datastart_offset = avio_tell(pb); return 0; } static int flv_write_trailer(AVFormatContext *s) { int64_t file_size; AVIOContext *pb = s->pb; FLVContext *flv = s->priv_data; int build_keyframes_idx = flv->flags & FLV_ADD_KEYFRAME_INDEX; int i, res; int64_t cur_pos = avio_tell(s->pb); if (build_keyframes_idx) { const FLVFileposition *newflv_posinfo; avio_seek(pb, flv->videosize_offset, SEEK_SET); put_amf_double(pb, flv->videosize); avio_seek(pb, flv->audiosize_offset, SEEK_SET); put_amf_double(pb, flv->audiosize); avio_seek(pb, flv->lasttimestamp_offset, SEEK_SET); put_amf_double(pb, flv->lasttimestamp); avio_seek(pb, flv->lastkeyframetimestamp_offset, SEEK_SET); put_amf_double(pb, flv->lastkeyframetimestamp); avio_seek(pb, flv->lastkeyframelocation_offset, SEEK_SET); put_amf_double(pb, flv->lastkeyframelocation + flv->keyframe_index_size); avio_seek(pb, cur_pos, SEEK_SET); res = shift_data(s); if (res < 0) { goto end; } avio_seek(pb, flv->keyframes_info_offset, SEEK_SET); put_amf_string(pb, "filepositions"); put_amf_dword_array(pb, flv->filepositions_count); for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) { put_amf_double(pb, newflv_posinfo->keyframe_position + flv->keyframe_index_size); } put_amf_string(pb, "times"); put_amf_dword_array(pb, flv->filepositions_count); for (newflv_posinfo = flv->head_filepositions; newflv_posinfo; newflv_posinfo = newflv_posinfo->next) { put_amf_double(pb, newflv_posinfo->keyframe_timestamp); } put_amf_string(pb, ""); avio_w8(pb, AMF_END_OF_OBJECT); avio_seek(pb, cur_pos + flv->keyframe_index_size, SEEK_SET); } end: if (flv->flags & FLV_NO_SEQUENCE_END) { av_log(s, AV_LOG_DEBUG, "FLV no sequence end mode open\n"); } else { /* Add EOS tag */ for (i = 0; i < s->nb_streams; i++) { AVCodecParameters *par = s->streams[i]->codecpar; if (par->codec_type == AVMEDIA_TYPE_VIDEO && (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4)) put_eos_tag(pb, flv->last_ts[i], par->codec_id); } } file_size = avio_tell(pb); if (build_keyframes_idx) { flv->datasize = file_size - flv->datastart_offset; avio_seek(pb, flv->datasize_offset, SEEK_SET); put_amf_double(pb, flv->datasize); } if (!(flv->flags & FLV_NO_METADATA)) { if (!(flv->flags & FLV_NO_DURATION_FILESIZE)) { /* 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); } } } return 0; } static int flv_write_packet(AVFormatContext *s, AVPacket *pkt) { AVIOContext *pb = s->pb; AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar; FLVContext *flv = s->priv_data; unsigned ts; int size = pkt->size; uint8_t *data = NULL; uint8_t frametype = pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER; int flags = -1, flags_size, ret = 0; int64_t cur_offset = avio_tell(pb); if (par->codec_type == AVMEDIA_TYPE_AUDIO && !pkt->size) { av_log(s, AV_LOG_WARNING, "Empty audio Packet\n"); return AVERROR(EINVAL); } if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A || par->codec_id == AV_CODEC_ID_VP6 || par->codec_id == AV_CODEC_ID_AAC) flags_size = 2; else if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) flags_size = 5; else flags_size = 1; if (par->codec_id == AV_CODEC_ID_HEVC && pkt->pts != pkt->dts) flags_size += 3; if (par->codec_id == AV_CODEC_ID_AAC || par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { size_t side_size; uint8_t *side = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &side_size); if (side && side_size > 0 && (side_size != par->extradata_size || memcmp(side, par->extradata, side_size))) { ret = ff_alloc_extradata(par, side_size); if (ret < 0) return ret; memcpy(par->extradata, side, side_size); flv_write_codec_header(s, par, pkt->dts); } flv_write_metadata_packet(s, par, pkt->dts); } 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); } if (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4 || par->codec_id == AV_CODEC_ID_HEVC || par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { if (pkt->pts == AV_NOPTS_VALUE) { av_log(s, AV_LOG_ERROR, "Packet is missing PTS\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; } avio_write_marker(pb, av_rescale(ts, AV_TIME_BASE, 1000), pkt->flags & AV_PKT_FLAG_KEY && (flv->video_par ? par->codec_type == AVMEDIA_TYPE_VIDEO : 1) ? AVIO_DATA_MARKER_SYNC_POINT : AVIO_DATA_MARKER_BOUNDARY_POINT); switch (par->codec_type) { case AVMEDIA_TYPE_VIDEO: avio_w8(pb, FLV_TAG_TYPE_VIDEO); flags = ff_codec_get_tag(flv_video_codec_ids, par->codec_id); flags |= frametype; break; case AVMEDIA_TYPE_AUDIO: flags = get_audio_flags(s, par); 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 (par->codec_id == AV_CODEC_ID_H264 || par->codec_id == AV_CODEC_ID_MPEG4) { /* check if extradata looks like mp4 formatted */ if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1) if ((ret = ff_nal_parse_units_buf(pkt->data, &data, &size)) < 0) return ret; } else if (par->codec_id == AV_CODEC_ID_HEVC) { if (par->extradata_size > 0 && *(uint8_t*)par->extradata != 1) if ((ret = ff_hevc_annexb2mp4_buf(pkt->data, &data, &size, 0, NULL)) < 0) return ret; } else if (par->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 (par->codec_id == AV_CODEC_ID_SPEEX && ts - flv->last_ts[pkt->stream_index] > 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 (flv->last_ts[pkt->stream_index] < ts) flv->last_ts[pkt->stream_index] = 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); ret = AVERROR(EINVAL); goto fail; } avio_wb24(pb, size + flags_size); put_timestamp(pb, ts); avio_wb24(pb, flv->reserved); if (par->codec_type == AVMEDIA_TYPE_DATA || par->codec_type == AVMEDIA_TYPE_SUBTITLE ) { int data_size; int64_t metadata_size_pos = avio_tell(pb); if (par->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); if (par->codec_id == AV_CODEC_ID_HEVC) { int pkttype = (pkt->pts != pkt->dts) ? PacketTypeCodedFrames : PacketTypeCodedFramesX; avio_w8(pb, FLV_IS_EX_HEADER | pkttype | frametype); // ExVideoTagHeader mode with PacketTypeCodedFrames(X) avio_write(pb, "hvc1", 4); if (pkttype == PacketTypeCodedFrames) avio_wb24(pb, pkt->pts - pkt->dts); } else if (par->codec_id == AV_CODEC_ID_AV1 || par->codec_id == AV_CODEC_ID_VP9) { avio_w8(pb, FLV_IS_EX_HEADER | PacketTypeCodedFrames | frametype); avio_write(pb, par->codec_id == AV_CODEC_ID_AV1 ? "av01" : "vp09", 4); } else { avio_w8(pb, flags); } if (par->codec_id == AV_CODEC_ID_VP6) avio_w8(pb,0); if (par->codec_id == AV_CODEC_ID_VP6F || par->codec_id == AV_CODEC_ID_VP6A) { if (par->extradata_size) avio_w8(pb, par->extradata[0]); else avio_w8(pb, ((FFALIGN(par->width, 16) - par->width) << 4) | (FFALIGN(par->height, 16) - par->height)); } else if (par->codec_id == AV_CODEC_ID_AAC) avio_w8(pb, 1); // AAC raw else if (par->codec_id == AV_CODEC_ID_H264 || par->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); } if (flv->flags & FLV_ADD_KEYFRAME_INDEX) { switch (par->codec_type) { case AVMEDIA_TYPE_VIDEO: flv->videosize += (avio_tell(pb) - cur_offset); flv->lasttimestamp = pkt->dts / 1000.0; if (pkt->flags & AV_PKT_FLAG_KEY) { flv->lastkeyframetimestamp = flv->lasttimestamp; flv->lastkeyframelocation = cur_offset; ret = flv_append_keyframe_info(s, flv, flv->lasttimestamp, cur_offset); if (ret < 0) goto fail; } break; case AVMEDIA_TYPE_AUDIO: flv->audiosize += (avio_tell(pb) - cur_offset); break; default: av_log(s, AV_LOG_WARNING, "par->codec_type is type = [%d]\n", par->codec_type); break; } } fail: av_free(data); return ret; } static int flv_check_bitstream(AVFormatContext *s, AVStream *st, const AVPacket *pkt) { if (st->codecpar->codec_id == AV_CODEC_ID_AAC) { if (pkt->size > 2 && (AV_RB16(pkt->data) & 0xfff0) == 0xfff0) return ff_stream_add_bitstream_filter(st, "aac_adtstoasc", NULL); } if (!st->codecpar->extradata_size && (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_HEVC || st->codecpar->codec_id == AV_CODEC_ID_AV1 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4)) return ff_stream_add_bitstream_filter(st, "extract_extradata", NULL); return 1; } static void flv_deinit(AVFormatContext *s) { FLVContext *flv = s->priv_data; FLVFileposition *filepos = flv->head_filepositions; while (filepos) { FLVFileposition *next = filepos->next; av_free(filepos); filepos = next; } flv->filepositions = flv->head_filepositions = NULL; flv->filepositions_count = 0; } 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, .unit = "flvflags" }, { "aac_seq_header_detect", "Put AAC sequence header based on stream data", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_AAC_SEQ_HEADER_DETECT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "flvflags" }, { "no_sequence_end", "disable sequence end for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_SEQUENCE_END}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "flvflags" }, { "no_metadata", "disable metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_METADATA}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "flvflags" }, { "no_duration_filesize", "disable duration and filesize zero value metadata for FLV", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_NO_DURATION_FILESIZE}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "flvflags" }, { "add_keyframe_index", "Add keyframe index metadata", 0, AV_OPT_TYPE_CONST, {.i64 = FLV_ADD_KEYFRAME_INDEX}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "flvflags" }, { NULL }, }; static const AVClass flv_muxer_class = { .class_name = "flv muxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; const FFOutputFormat ff_flv_muxer = { .p.name = "flv", .p.long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"), .p.mime_type = "video/x-flv", .p.extensions = "flv", .priv_data_size = sizeof(FLVContext), .p.audio_codec = CONFIG_LIBMP3LAME ? AV_CODEC_ID_MP3 : AV_CODEC_ID_ADPCM_SWF, .p.video_codec = AV_CODEC_ID_FLV1, .init = flv_init, .write_header = flv_write_header, .write_packet = flv_write_packet, .write_trailer = flv_write_trailer, .deinit = flv_deinit, .check_bitstream= flv_check_bitstream, .p.codec_tag = (const AVCodecTag* const []) { flv_video_codec_ids, flv_audio_codec_ids, 0 }, .p.flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, .p.priv_class = &flv_muxer_class, };