diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/flvdec.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/flvdec.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/flvdec.c b/contrib/ffmpeg/libavformat/flvdec.c new file mode 100644 index 000000000..a1c2aa4eb --- /dev/null +++ b/contrib/ffmpeg/libavformat/flvdec.c @@ -0,0 +1,259 @@ +/* + * FLV demuxer + * 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 + * + * + * 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 + */ +#include "avformat.h" + +static int flv_probe(AVProbeData *p) +{ + const uint8_t *d; + + if (p->buf_size < 6) + return 0; + d = p->buf; + if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V') { + return 50; + } + return 0; +} + +static int flv_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + int offset, flags, size; + + s->ctx_flags |= AVFMTCTX_NOHEADER; //ok we have a header but theres no fps, codec type, sample_rate, ... + + url_fskip(&s->pb, 4); + flags = get_byte(&s->pb); + + offset = get_be32(&s->pb); + + if(!url_is_streamed(&s->pb)){ + const int fsize= url_fsize(&s->pb); + url_fseek(&s->pb, fsize-4, SEEK_SET); + size= get_be32(&s->pb); + url_fseek(&s->pb, fsize-3-size, SEEK_SET); + if(size == get_be24(&s->pb) + 11){ + s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000; + } + } + + url_fseek(&s->pb, offset, SEEK_SET); + + s->start_time = 0; + + return 0; +} + +static int flv_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int ret, i, type, size, pts, flags, is_audio, next, pos; + AVStream *st = NULL; + + for(;;){ + pos = url_ftell(&s->pb); + url_fskip(&s->pb, 4); /* size of previous packet */ + type = get_byte(&s->pb); + size = get_be24(&s->pb); + pts = get_be24(&s->pb); +// av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts); + if (url_feof(&s->pb)) + return AVERROR_IO; + url_fskip(&s->pb, 4); /* reserved */ + flags = 0; + + if(size == 0) + continue; + + next= size + url_ftell(&s->pb); + + if (type == 8) { + is_audio=1; + flags = get_byte(&s->pb); + } else if (type == 9) { + is_audio=0; + flags = get_byte(&s->pb); + } else if (type == 18 && size > 13+1+4) { + url_fskip(&s->pb, 13); //onMetaData blah + if(get_byte(&s->pb) == 8){ + url_fskip(&s->pb, 4); + } + while(url_ftell(&s->pb) + 5 < next){ + char tmp[128]; + int type, len; + double d= 0; + + len= get_be16(&s->pb); + if(len >= sizeof(tmp) || !len) + break; + get_buffer(&s->pb, tmp, len); + tmp[len]=0; + + type= get_byte(&s->pb); + if(type==0){ + d= av_int2dbl(get_be64(&s->pb)); + }else if(type==2){ + len= get_be16(&s->pb); + if(len >= sizeof(tmp)) + break; + url_fskip(&s->pb, len); + }else if(type==8){ + //array + break; + }else if(type==11){ + d= av_int2dbl(get_be64(&s->pb)); + get_be16(&s->pb); + } + + if(!strcmp(tmp, "duration")){ + s->duration = d*AV_TIME_BASE; + }else if(!strcmp(tmp, "videodatarate")){ + }else if(!strcmp(tmp, "audiodatarate")){ + } + } + url_fseek(&s->pb, next, SEEK_SET); + continue; + } else { + /* skip packet */ + av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags); + url_fseek(&s->pb, next, SEEK_SET); + continue; + } + + /* now find stream */ + for(i=0;i<s->nb_streams;i++) { + st = s->streams[i]; + if (st->id == is_audio) + break; + } + if(i == s->nb_streams){ + st = av_new_stream(s, is_audio); + if (!st) + return AVERROR_NOMEM; + + av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */ + st->codec->time_base= (AVRational){1,1000}; + } +// av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard); + if( (st->discard >= AVDISCARD_NONKEY && !((flags >> 4)==1 || is_audio)) + ||(st->discard >= AVDISCARD_BIDIR && ((flags >> 4)==3 && !is_audio)) + || st->discard >= AVDISCARD_ALL + ){ + url_fseek(&s->pb, next, SEEK_SET); + continue; + } + if ((flags >> 4)==1) + av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME); + break; + } + + if(is_audio){ + if(st->codec->sample_rate == 0){ + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->channels = (flags&1)+1; + if((flags >> 4) == 5) + st->codec->sample_rate= 8000; + else + st->codec->sample_rate = (44100<<((flags>>2)&3))>>3; + switch(flags >> 4){/* 0: uncompressed 1: ADPCM 2: mp3 5: Nellymoser 8kHz mono 6: Nellymoser*/ + case 0: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16BE; + else st->codec->codec_id = CODEC_ID_PCM_S8; break; + case 1: st->codec->codec_id = CODEC_ID_ADPCM_SWF; break; + case 2: st->codec->codec_id = CODEC_ID_MP3; st->need_parsing = 1; break; + // this is not listed at FLV but at SWF, strange... + case 3: if (flags&2) st->codec->codec_id = CODEC_ID_PCM_S16LE; + else st->codec->codec_id = CODEC_ID_PCM_S8; break; + default: + av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4); + st->codec->codec_tag= (flags >> 4); + } + st->codec->bits_per_sample = (flags & 2) ? 16 : 8; + } + }else{ + st->codec->codec_type = CODEC_TYPE_VIDEO; + switch(flags & 0xF){ + case 2: st->codec->codec_id = CODEC_ID_FLV1; break; + case 3: st->codec->codec_id = CODEC_ID_FLASHSV; break; + case 4: + st->codec->codec_id = CODEC_ID_VP6F; + if (st->codec->extradata_size != 1) { + st->codec->extradata_size = 1; + st->codec->extradata = av_malloc(1); + } + /* width and height adjustment */ + st->codec->extradata[0] = get_byte(&s->pb); + size--; + break; + default: + av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flags & 0xf); + st->codec->codec_tag= flags & 0xF; + } + } + + ret= av_get_packet(&s->pb, pkt, size - 1); + if (ret <= 0) { + return AVERROR_IO; + } + /* note: we need to modify the packet size here to handle the last + packet */ + pkt->size = ret; + pkt->pts = pts; + pkt->stream_index = st->index; + + if (is_audio || ((flags >> 4)==1)) + pkt->flags |= PKT_FLAG_KEY; + + return ret; +} + +static int flv_read_close(AVFormatContext *s) +{ + return 0; +} + +static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) +{ + AVStream *st = s->streams[stream_index]; + int index = av_index_search_timestamp(st, timestamp, flags); + if (index < 0) + return -1; + url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET); + + return 0; +} + +AVInputFormat flv_demuxer = { + "flv", + "flv format", + 0, + flv_probe, + flv_read_header, + flv_read_packet, + flv_read_close, + flv_read_seek, + .extensions = "flv", + .value = CODEC_ID_FLV1, +}; |