static int read_header(AVFormatContext *s, AVFormatParameters *ap) { JVDemuxContext *jv = s->priv_data; AVIOContext *pb = s->pb; AVStream *vst, *ast; int64_t audio_pts = 0; int64_t offset; int i; avio_skip(pb, 80); ast = av_new_stream(s, 0); vst = av_new_stream(s, 1); if (!ast || !vst) return AVERROR(ENOMEM); vst->codec->codec_type = CODEC_TYPE_VIDEO; vst->codec->codec_id = CODEC_ID_JV; vst->codec->codec_tag = 0; /* no fourcc */ vst->codec->width = avio_rl16(pb); vst->codec->height = avio_rl16(pb); vst->nb_frames = ast->nb_index_entries = avio_rl16(pb); av_set_pts_info(vst, 64, avio_rl16(pb), 1000); avio_skip(pb, 4); ast->codec->codec_type = CODEC_TYPE_AUDIO; ast->codec->codec_id = CODEC_ID_PCM_U8; ast->codec->codec_tag = 0; /* no fourcc */ ast->codec->sample_rate = avio_rl16(pb); ast->codec->channels = 1; av_set_pts_info(ast, 64, 1, ast->codec->sample_rate); avio_skip(pb, 10); ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries)); if (!ast->index_entries) return AVERROR(ENOMEM); jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); if (!jv->frames) return AVERROR(ENOMEM); offset = 0x68 + ast->nb_index_entries * 16; for(i = 0; i < ast->nb_index_entries; i++) { AVIndexEntry *e = ast->index_entries + i; JVFrame *jvf = jv->frames + i; /* total frame size including audio, video, palette data and padding */ e->size = avio_rl32(pb); e->timestamp = i; e->pos = offset; offset += e->size; jvf->audio_size = avio_rl32(pb); jvf->video_size = avio_rl32(pb); jvf->palette_size = avio_r8(pb) ? 768 : 0; if (avio_r8(pb)) av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); jvf->video_type = avio_r8(pb); avio_skip(pb, 1); e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; audio_pts += jvf->audio_size; e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; } jv->state = JV_AUDIO; return 0; }