static av_cold int rl2_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; AVStream *st; unsigned int frame_count; unsigned int audio_frame_counter = 0; unsigned int video_frame_counter = 0; unsigned int back_size; unsigned short sound_rate; unsigned short rate; unsigned short channels; unsigned short def_sound_size; unsigned int signature; unsigned int pts_den = 11025; /* video only case */ unsigned int pts_num = 1103; unsigned int* chunk_offset = NULL; int* chunk_size = NULL; int* audio_size = NULL; int i; int ret = 0; avio_skip(pb,4); /* skip FORM tag */ back_size = avio_rl32(pb); /**< get size of the background frame */ signature = avio_rb32(pb); avio_skip(pb, 4); /* data size */ frame_count = avio_rl32(pb); /* disallow back_sizes and frame_counts that may lead to overflows later */ if(back_size > INT_MAX/2 || frame_count > INT_MAX / sizeof(uint32_t)) avio_skip(pb, 2); /* encoding mentod */ sound_rate = avio_rl16(pb); rate = avio_rl16(pb); channels = avio_rl16(pb); def_sound_size = avio_rl16(pb); /** setup video stream */ st = avformat_new_stream(s, NULL); if(!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_RL2; st->codec->codec_tag = 0; /* no fourcc */ st->codec->width = 320; st->codec->height = 200; /** allocate and fill extradata */ st->codec->extradata_size = EXTRADATA1_SIZE; if(signature == RLV3_TAG && back_size > 0) st->codec->extradata_size += back_size; st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); if(!st->codec->extradata) return AVERROR(ENOMEM); if(avio_read(pb,st->codec->extradata,st->codec->extradata_size) != st->codec->extradata_size) return AVERROR(EIO); /** setup audio stream if present */ if(sound_rate){ pts_num = def_sound_size; pts_den = rate; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = AV_CODEC_ID_PCM_U8; st->codec->codec_tag = 1; st->codec->channels = channels; st->codec->bits_per_coded_sample = 8; st->codec->sample_rate = rate; st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample; st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample / 8; avpriv_set_pts_info(st,32,1,rate); avpriv_set_pts_info(s->streams[0], 32, pts_num, pts_den); chunk_size = av_malloc(frame_count * sizeof(uint32_t)); audio_size = av_malloc(frame_count * sizeof(uint32_t)); chunk_offset = av_malloc(frame_count * sizeof(uint32_t)); if(!chunk_size || !audio_size || !chunk_offset){ av_free(chunk_size); av_free(audio_size); av_free(chunk_offset); return AVERROR(ENOMEM); /** read offset and size tables */ for(i=0; i < frame_count;i++) chunk_size[i] = avio_rl32(pb); for(i=0; i < frame_count;i++) chunk_offset[i] = avio_rl32(pb); for(i=0; i < frame_count;i++) audio_size[i] = avio_rl32(pb) & 0xFFFF; /** build the sample index */ for(i=0;i<frame_count;i++){ if(chunk_size[i] < 0 || audio_size[i] > chunk_size[i]){ ret = AVERROR_INVALIDDATA; break; if(sound_rate && audio_size[i]){ av_add_index_entry(s->streams[1], chunk_offset[i], audio_frame_counter,audio_size[i], 0, AVINDEX_KEYFRAME); audio_frame_counter += audio_size[i] / channels; av_add_index_entry(s->streams[0], chunk_offset[i] + audio_size[i], video_frame_counter,chunk_size[i]-audio_size[i],0,AVINDEX_KEYFRAME); ++video_frame_counter; av_free(chunk_size); av_free(audio_size); av_free(chunk_offset); return ret;