/* * FLV demuxer * Copyright (c) 2003 The FFmpeg Project * * This demuxer will generate a 1 byte extradata for VP6F content. * It is composed of: * - upper 4bits: difference between encoded width and visible width * - lower 4bits: difference between encoded height and visible height * * 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/avstring.h" #include "libavutil/dict.h" #include "libavutil/opt.h" #include "libavutil/intfloat.h" #include "libavutil/mathematics.h" #include "libavcodec/bytestream.h" #include "libavcodec/mpeg4audio.h" #include "avformat.h" #include "internal.h" #include "avio_internal.h" #include "flv.h" #define VALIDATE_INDEX_TS_THRESH 2500 typedef struct { const AVClass *class; ///< Class for private options. int trust_metadata; ///< configure streams according onMetaData int wrong_dts; ///< wrong dts due to negative cts uint8_t *new_extradata[FLV_STREAM_TYPE_NB]; int new_extradata_size[FLV_STREAM_TYPE_NB]; int last_sample_rate; int last_channels; struct { int64_t dts; int64_t pos; } validate_index[2]; int validate_next; int validate_count; int searched_for_end; } FLVContext; static int flv_probe(AVProbeData *p) { const uint8_t *d; d = p->buf; if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) { return AVPROBE_SCORE_MAX; } return 0; } static AVStream *create_stream(AVFormatContext *s, int codec_type) { AVStream *st = avformat_new_stream(s, NULL); if (!st) return NULL; st->codec->codec_type = codec_type; if(s->nb_streams>=3 ||( s->nb_streams==2 && s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA && s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA)) s->ctx_flags &= ~AVFMTCTX_NOHEADER; avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */ return st; } static int flv_same_audio_codec(AVCodecContext *acodec, int flags) { int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; int flv_codecid = flags & FLV_AUDIO_CODECID_MASK; int codec_id; if (!acodec->codec_id && !acodec->codec_tag) return 1; if (acodec->bits_per_coded_sample != bits_per_coded_sample) return 0; switch(flv_codecid) { //no distinction between S16 and S8 PCM codec flags case FLV_CODECID_PCM: codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : #if HAVE_BIGENDIAN AV_CODEC_ID_PCM_S16BE; #else AV_CODEC_ID_PCM_S16LE; #endif return codec_id == acodec->codec_id; case FLV_CODECID_PCM_LE: codec_id = bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; return codec_id == acodec->codec_id; case FLV_CODECID_AAC: return acodec->codec_id == AV_CODEC_ID_AAC; case FLV_CODECID_ADPCM: return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF; case FLV_CODECID_SPEEX: return acodec->codec_id == AV_CODEC_ID_SPEEX; case FLV_CODECID_MP3: return acodec->codec_id == AV_CODEC_ID_MP3; case FLV_CODECID_NELLYMOSER_8KHZ_MONO: case FLV_CODECID_NELLYMOSER_16KHZ_MONO: case FLV_CODECID_NELLYMOSER: return acodec->codec_id == AV_CODEC_ID_NELLYMOSER; case FLV_CODECID_PCM_MULAW: return acodec->sample_rate == 8000 && acodec->codec_id == AV_CODEC_ID_PCM_MULAW; case FLV_CODECID_PCM_ALAW: return acodec->sample_rate = 8000 && acodec->codec_id == AV_CODEC_ID_PCM_ALAW; default: return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET); } return 0; } static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, AVCodecContext *acodec, int flv_codecid) { switch(flv_codecid) { //no distinction between S16 and S8 PCM codec flags case FLV_CODECID_PCM: acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : #if HAVE_BIGENDIAN AV_CODEC_ID_PCM_S16BE; #else AV_CODEC_ID_PCM_S16LE; #endif break; case FLV_CODECID_PCM_LE: acodec->codec_id = acodec->bits_per_coded_sample == 8 ? AV_CODEC_ID_PCM_U8 : AV_CODEC_ID_PCM_S16LE; break; case FLV_CODECID_AAC : acodec->codec_id = AV_CODEC_ID_AAC; break; case FLV_CODECID_ADPCM: acodec->codec_id = AV_CODEC_ID_ADPCM_SWF; break; case FLV_CODECID_SPEEX: acodec->codec_id = AV_CODEC_ID_SPEEX; acodec->sample_rate = 16000; break; case FLV_CODECID_MP3 : acodec->codec_id = AV_CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break; case FLV_CODECID_NELLYMOSER_8KHZ_MONO: acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate acodec->codec_id = AV_CODEC_ID_NELLYMOSER; break; case FLV_CODECID_NELLYMOSER_16KHZ_MONO: acodec->sample_rate = 16000; acodec->codec_id = AV_CODEC_ID_NELLYMOSER; break; case FLV_CODECID_NELLYMOSER: acodec->codec_id = AV_CODEC_ID_NELLYMOSER; break; case FLV_CODECID_PCM_MULAW: acodec->sample_rate = 8000; acodec->codec_id = AV_CODEC_ID_PCM_MULAW; break; case FLV_CODECID_PCM_ALAW: acodec->sample_rate = 8000; acodec->codec_id = AV_CODEC_ID_PCM_ALAW; break; default: av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET); acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET; } } static int flv_same_video_codec(AVCodecContext *vcodec, int flags) { int flv_codecid = flags & FLV_VIDEO_CODECID_MASK; if (!vcodec->codec_id && !vcodec->codec_tag) return 1; switch (flv_codecid) { case FLV_CODECID_H263: return vcodec->codec_id == AV_CODEC_ID_FLV1; case FLV_CODECID_SCREEN: return vcodec->codec_id == AV_CODEC_ID_FLASHSV; case FLV_CODECID_SCREEN2: return vcodec->codec_id == AV_CODEC_ID_FLASHSV2; case FLV_CODECID_VP6: return vcodec->codec_id == AV_CODEC_ID_VP6F; case FLV_CODECID_VP6A: return vcodec->codec_id == AV_CODEC_ID_VP6A; case FLV_CODECID_H264: return vcodec->codec_id == AV_CODEC_ID_H264; default: return vcodec->codec_tag == flv_codecid; } return 0; } static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) { AVCodecContext *vcodec = vstream->codec; switch(flv_codecid) { case FLV_CODECID_H263 : vcodec->codec_id = AV_CODEC_ID_FLV1 ; break; case FLV_CODECID_REALH263: vcodec->codec_id = AV_CODEC_ID_H263 ; break; // Really mean it this time case FLV_CODECID_SCREEN: vcodec->codec_id = AV_CODEC_ID_FLASHSV; break; case FLV_CODECID_SCREEN2: vcodec->codec_id = AV_CODEC_ID_FLASHSV2; break; case FLV_CODECID_VP6 : vcodec->codec_id = AV_CODEC_ID_VP6F ; case FLV_CODECID_VP6A : if(flv_codecid == FLV_CODECID_VP6A) vcodec->codec_id = AV_CODEC_ID_VP6A; if(vcodec->extradata_size != 1) { vcodec->extradata_size = 1; vcodec->extradata = av_malloc(1 + FF_INPUT_BUFFER_PADDING_SIZE); } vcodec->extradata[0] = avio_r8(s->pb); return 1; // 1 byte body size adjustment for flv_read_packet() case FLV_CODECID_H264: vcodec->codec_id = AV_CODEC_ID_H264; return 3; // not 4, reading packet type will consume one byte case FLV_CODECID_MPEG4: vcodec->codec_id = AV_CODEC_ID_MPEG4; return 3; default: av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid); vcodec->codec_tag = flv_codecid; } return 0; } static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) { int length = avio_rb16(ioc); if(length >= buffsize) { avio_skip(ioc, length); return -1; } avio_read(ioc, buffer, length); buffer[length] = '\0'; return length; } static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) { FLVContext *flv = s->priv_data; unsigned int timeslen = 0, fileposlen = 0, i; char str_val[256]; int64_t *times = NULL; int64_t *filepositions = NULL; int ret = AVERROR(ENOSYS); int64_t initial_pos = avio_tell(ioc); if(vstream->nb_index_entries>0){ av_log(s, AV_LOG_WARNING, "Skiping duplicate index\n"); return 0; } if (s->flags & AVFMT_FLAG_IGNIDX) return 0; while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { int64_t** current_array; unsigned int arraylen; // Expect array object in context if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY) break; arraylen = avio_rb32(ioc); if(arraylen>>28) break; if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){ current_array= × timeslen= arraylen; }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){ current_array= &filepositions; fileposlen= arraylen; }else // unexpected metatag inside keyframes, will not use such metadata for indexing break; if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) { ret = AVERROR(ENOMEM); goto finish; } for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER) goto invalid; current_array[0][i] = av_int2double(avio_rb64(ioc)); } if (times && filepositions) { // All done, exiting at a position allowing amf_parse_object // to finish parsing the object ret = 0; break; } } if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) { for (i = 0; i < fileposlen; i++) { av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME); if (i < 2) { flv->validate_index[i].pos = filepositions[i]; flv->validate_index[i].dts = times[i] * 1000; flv->validate_count = i + 1; } } } else { invalid: av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n"); } finish: av_freep(×); av_freep(&filepositions); avio_seek(ioc, initial_pos, SEEK_SET); return ret; } static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) { AVCodecContext *acodec, *vcodec; FLVContext *flv = s->priv_data; AVIOContext *ioc; AMFDataType amf_type; char str_val[256]; double num_val; num_val = 0; ioc = s->pb; amf_type = avio_r8(ioc); switch(amf_type) { case AMF_DATA_TYPE_NUMBER: num_val = av_int2double(avio_rb64(ioc)); break; case AMF_DATA_TYPE_BOOL: num_val = avio_r8(ioc); break; case AMF_DATA_TYPE_STRING: if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0) return -1; break; case AMF_DATA_TYPE_OBJECT: if ((vstream || astream) && ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1) if (parse_keyframes_index(s, ioc, vstream ? vstream : astream, max_pos) < 0) av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n"); while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { if (amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) return -1; //if we couldn't skip, bomb out. } if(avio_r8(ioc) != AMF_END_OF_OBJECT) return -1; break; case AMF_DATA_TYPE_NULL: case AMF_DATA_TYPE_UNDEFINED: case AMF_DATA_TYPE_UNSUPPORTED: break; //these take up no additional space case AMF_DATA_TYPE_MIXEDARRAY: avio_skip(ioc, 4); //skip 32-bit max array index while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) { //this is the only case in which we would want a nested parse to not skip over the object if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0) return -1; } if(avio_r8(ioc) != AMF_END_OF_OBJECT) return -1; break; case AMF_DATA_TYPE_ARRAY: { unsigned int arraylen, i; arraylen = avio_rb32(ioc); for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) { if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0) return -1; //if we couldn't skip, bomb out. } } break; case AMF_DATA_TYPE_DATE: avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16) break; default: //unsupported type, we couldn't skip return -1; } if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL acodec = astream ? astream->codec : NULL; vcodec = vstream ? vstream->codec : NULL; if (amf_type == AMF_DATA_TYPE_NUMBER) { if (!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE; else if (!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0)) vcodec->bit_rate = num_val * 1024.0; else if (!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0)) acodec->bit_rate = num_val * 1024.0; else if (!strcmp(key, "datastream")) { AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA); if (!st) return AVERROR(ENOMEM); st->codec->codec_id = AV_CODEC_ID_TEXT; } else if (flv->trust_metadata) { if (!strcmp(key, "videocodecid") && vcodec) { flv_set_video_codec(s, vstream, num_val); } else if (!strcmp(key, "audiocodecid") && acodec) { flv_set_audio_codec(s, astream, acodec, num_val); } else if (!strcmp(key, "audiosamplerate") && acodec) { acodec->sample_rate = num_val; } else if (!strcmp(key, "width") && vcodec) { vcodec->width = num_val; } else if (!strcmp(key, "height") && vcodec) { vcodec->height = num_val; } } } if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 && ((!acodec && !strcmp(key, "audiocodecid")) || (!vcodec && !strcmp(key, "videocodecid")))) s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object if (!strcmp(key, "duration") || !strcmp(key, "filesize") || !strcmp(key, "width") || !strcmp(key, "height") || !strcmp(key, "videodatarate") || !strcmp(key, "framerate") || !strcmp(key, "videocodecid") || !strcmp(key, "audiodatarate") || !strcmp(key, "audiosamplerate") || !strcmp(key, "audiosamplesize") || !strcmp(key, "stereo") || !strcmp(key, "audiocodecid")) return 0; if(amf_type == AMF_DATA_TYPE_BOOL) { av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val)); av_dict_set(&s->metadata, key, str_val, 0); } else if(amf_type == AMF_DATA_TYPE_NUMBER) { snprintf(str_val, sizeof(str_val), "%.f", num_val); av_dict_set(&s->metadata, key, str_val, 0); } else if (amf_type == AMF_DATA_TYPE_STRING) av_dict_set(&s->metadata, key, str_val, 0); } return 0; } static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) { AMFDataType type; AVStream *stream, *astream, *vstream, *dstream; AVIOContext *ioc; int i; char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want. vstream = astream = dstream = NULL; ioc = s->pb; //first object needs to be "onMetaData" string type = avio_r8(ioc); if (type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0) return -1; if (!strcmp(buffer, "onTextData")) return 1; if (strcmp(buffer, "onMetaData")) return -1; //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called. for(i = 0; i < s->nb_streams; i++) { stream = s->streams[i]; if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream; else if(stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream; else if(stream->codec->codec_type == AVMEDIA_TYPE_DATA) dstream = stream; } //parse the second object (we want a mixed array) if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0) return -1; return 0; } static int flv_read_header(AVFormatContext *s) { int offset, flags; avio_skip(s->pb, 4); flags = avio_r8(s->pb); /* old flvtool cleared this field */ /* FIXME: better fix needed */ if (!flags) { flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO; av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n"); } s->ctx_flags |= AVFMTCTX_NOHEADER; if(flags & FLV_HEADER_FLAG_HASVIDEO){ if(!create_stream(s, AVMEDIA_TYPE_VIDEO)) return AVERROR(ENOMEM); } if(flags & FLV_HEADER_FLAG_HASAUDIO){ if(!create_stream(s, AVMEDIA_TYPE_AUDIO)) return AVERROR(ENOMEM); } // Flag doesn't indicate whether or not there is script-data present. Must // create that stream if it's encountered. offset = avio_rb32(s->pb); avio_seek(s->pb, offset, SEEK_SET); avio_skip(s->pb, 4); s->start_time = 0; return 0; } static int flv_read_close(AVFormatContext *s) { int i; FLVContext *flv = s->priv_data; for(i=0; i<FLV_STREAM_TYPE_NB; i++) av_freep(&flv->new_extradata[i]); return 0; } static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size) { av_free(st->codec->extradata); st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); st->codec->extradata_size = size; avio_read(s->pb, st->codec->extradata, st->codec->extradata_size); return 0; } static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream, int size) { av_free(flv->new_extradata[stream]); flv->new_extradata[stream] = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); if (!flv->new_extradata[stream]) return AVERROR(ENOMEM); flv->new_extradata_size[stream] = size; avio_read(pb, flv->new_extradata[stream], size); return 0; } static void clear_index_entries(AVFormatContext *s, int64_t pos) { int i, j, out; av_log(s, AV_LOG_WARNING, "Found invalid index entries, clearing the index.\n"); for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; /* Remove all index entries that point to >= pos */ out = 0; for (j = 0; j < st->nb_index_entries; j++) { if (st->index_entries[j].pos < pos) st->index_entries[out++] = st->index_entries[j]; } st->nb_index_entries = out; } } static int flv_data_packet(AVFormatContext *s, AVPacket *pkt, int64_t dts, int64_t next) { int ret = AVERROR_INVALIDDATA, i; AVIOContext *pb = s->pb; AVStream *st = NULL; AMFDataType type; char buf[20]; int length; type = avio_r8(pb); if (type == AMF_DATA_TYPE_MIXEDARRAY) avio_seek(pb, 4, SEEK_CUR); else if (type != AMF_DATA_TYPE_OBJECT) goto out; amf_get_string(pb, buf, sizeof(buf)); if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING) goto out; amf_get_string(pb, buf, sizeof(buf)); //FIXME parse it as codec_id amf_get_string(pb, buf, sizeof(buf)); if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING) goto out; length = avio_rb16(pb); ret = av_get_packet(s->pb, pkt, length); if (ret < 0) { ret = AVERROR(EIO); goto out; } for (i = 0; i < s->nb_streams; i++) { st = s->streams[i]; if (st->codec->codec_type == AVMEDIA_TYPE_DATA) break; } if (i == s->nb_streams) { st = create_stream(s, AVMEDIA_TYPE_DATA); if (!st) goto out; st->codec->codec_id = AV_CODEC_ID_TEXT; } pkt->dts = dts; pkt->pts = dts; pkt->size = ret; pkt->stream_index = st->index; pkt->flags |= AV_PKT_FLAG_KEY; avio_seek(s->pb, next + 4, SEEK_SET); out: return ret; } static int flv_read_packet(AVFormatContext *s, AVPacket *pkt) { FLVContext *flv = s->priv_data; int ret, i, type, size, flags; int stream_type=-1; int64_t next, pos; int64_t dts, pts = AV_NOPTS_VALUE; int av_uninit(channels); int av_uninit(sample_rate); AVStream *st = NULL; for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */ pos = avio_tell(s->pb); type = avio_r8(s->pb); size = avio_rb24(s->pb); dts = avio_rb24(s->pb); dts |= avio_r8(s->pb) << 24; av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts); if (url_feof(s->pb)) return AVERROR_EOF; avio_skip(s->pb, 3); /* stream id, always 0 */ flags = 0; if (flv->validate_next < flv->validate_count) { int64_t validate_pos = flv->validate_index[flv->validate_next].pos; if (pos == validate_pos) { if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <= VALIDATE_INDEX_TS_THRESH) { flv->validate_next++; } else { clear_index_entries(s, validate_pos); flv->validate_count = 0; } } else if (pos > validate_pos) { clear_index_entries(s, validate_pos); flv->validate_count = 0; } } if(size == 0) continue; next= size + avio_tell(s->pb); if (type == FLV_TAG_TYPE_AUDIO) { stream_type=FLV_STREAM_TYPE_AUDIO; flags = avio_r8(s->pb); size--; } else if (type == FLV_TAG_TYPE_VIDEO) { stream_type=FLV_STREAM_TYPE_VIDEO; flags = avio_r8(s->pb); size--; if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD) goto skip; } else if (type == FLV_TAG_TYPE_META) { if (size > 13+1+4 && dts == 0) { // Header-type metadata stuff flv_read_metabody(s, next); goto skip; } else if (dts != 0) { // Script-data "special" metadata frames - don't skip stream_type=FLV_STREAM_TYPE_DATA; } else { goto skip; } } else { av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags); skip: avio_seek(s->pb, next, SEEK_SET); continue; } /* skip empty data packets */ if (!size) continue; /* now find stream */ for(i=0;i<s->nb_streams;i++) { st = s->streams[i]; if (stream_type == FLV_STREAM_TYPE_AUDIO && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { if (flv_same_audio_codec(st->codec, flags)) { break; } } else if (stream_type == FLV_STREAM_TYPE_VIDEO && st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { if (flv_same_video_codec(st->codec, flags)) { break; } } else if (st->id == stream_type) { break; } } if(i == s->nb_streams){ av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n"); st = create_stream(s, (int[]){AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA}[stream_type]); } av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard); if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO))) ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO))) || st->discard >= AVDISCARD_ALL ){ avio_seek(s->pb, next, SEEK_SET); continue; } if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME); break; } // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE) && !flv->searched_for_end){ int size; const int64_t pos= avio_tell(s->pb); int64_t fsize= avio_size(s->pb); retry_duration: avio_seek(s->pb, fsize-4, SEEK_SET); size= avio_rb32(s->pb); avio_seek(s->pb, fsize-3-size, SEEK_SET); if(size == avio_rb24(s->pb) + 11){ uint32_t ts = avio_rb24(s->pb); ts |= avio_r8(s->pb) << 24; if(ts) s->duration = ts * (int64_t)AV_TIME_BASE / 1000; else if (fsize >= 8 && fsize - 8 >= size){ fsize -= size+4; goto retry_duration; } } avio_seek(s->pb, pos, SEEK_SET); flv->searched_for_end = 1; } if(stream_type == FLV_STREAM_TYPE_AUDIO){ int bits_per_coded_sample; channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1; sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3); bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8; if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) { st->codec->channels = channels; st->codec->sample_rate = sample_rate; st->codec->bits_per_coded_sample = bits_per_coded_sample; } if(!st->codec->codec_id){ flv_set_audio_codec(s, st, st->codec, flags & FLV_AUDIO_CODECID_MASK); flv->last_sample_rate = sample_rate = st->codec->sample_rate; flv->last_channels = channels = st->codec->channels; } else { AVCodecContext ctx; ctx.sample_rate = sample_rate; flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK); sample_rate = ctx.sample_rate; } } else if(stream_type == FLV_STREAM_TYPE_VIDEO) { size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK); } if (st->codec->codec_id == AV_CODEC_ID_AAC || st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) { int type = avio_r8(s->pb); size--; if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) { int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension pts = dts + cts; if (cts < 0) { // dts are wrong flv->wrong_dts = 1; av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n"); } if (flv->wrong_dts) dts = AV_NOPTS_VALUE; } if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC)) { if (st->codec->extradata) { if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0) return ret; ret = AVERROR(EAGAIN); goto leave; } if ((ret = flv_get_extradata(s, st, size)) < 0) return ret; if (st->codec->codec_id == AV_CODEC_ID_AAC) { MPEG4AudioConfig cfg; if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata, st->codec->extradata_size * 8, 1) >= 0) { st->codec->channels = cfg.channels; if (cfg.ext_sample_rate) st->codec->sample_rate = cfg.ext_sample_rate; else st->codec->sample_rate = cfg.sample_rate; av_dlog(s, "mp4a config channels %d sample rate %d\n", st->codec->channels, st->codec->sample_rate); } } ret = AVERROR(EAGAIN); goto leave; } } /* skip empty data packets */ if (!size) { ret = AVERROR(EAGAIN); goto leave; } ret= av_get_packet(s->pb, pkt, size); if (ret < 0) return ret; pkt->dts = dts; pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts; pkt->stream_index = st->index; if (flv->new_extradata[stream_type]) { uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, flv->new_extradata_size[stream_type]); if (side) { memcpy(side, flv->new_extradata[stream_type], flv->new_extradata_size[stream_type]); av_freep(&flv->new_extradata[stream_type]); flv->new_extradata_size[stream_type] = 0; } } if (stream_type == FLV_STREAM_TYPE_AUDIO && (sample_rate != flv->last_sample_rate || channels != flv->last_channels)) { flv->last_sample_rate = sample_rate; flv->last_channels = channels; ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0); } if ( stream_type == FLV_STREAM_TYPE_AUDIO || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) || stream_type == FLV_STREAM_TYPE_DATA) pkt->flags |= AV_PKT_FLAG_KEY; leave: avio_skip(s->pb, 4); return ret; } static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags) { FLVContext *flv = s->priv_data; flv->validate_count = 0; return avio_seek_time(s->pb, stream_index, ts, flags); } #define OFFSET(x) offsetof(FLVContext, x) #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM static const AVOption options[] = { { "flv_metadata", "Allocate streams according the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { 0 }, 0, 1, VD}, { NULL } }; static const AVClass class = { .class_name = "flvdec", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVInputFormat ff_flv_demuxer = { .name = "flv", .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"), .priv_data_size = sizeof(FLVContext), .read_probe = flv_probe, .read_header = flv_read_header, .read_packet = flv_read_packet, .read_seek = flv_read_seek, .read_close = flv_read_close, .extensions = "flv", .priv_class = &class, };