static int ffm_read_header(AVFormatContext *s) { FFMContext *ffm = s->priv_data; AVStream *st; AVIOContext *pb = s->pb; AVCodecContext *codec; const AVCodecDescriptor *codec_desc; int i, nb_streams; uint32_t tag; /* header */ tag = avio_rl32(pb); if (tag == MKTAG('F', 'F', 'M', '2')) return ffm2_read_header(s); if (tag != MKTAG('F', 'F', 'M', '1')) ffm->packet_size = avio_rb32(pb); if (ffm->packet_size != FFM_PACKET_SIZE) ffm->write_index = avio_rb64(pb); /* get also filesize */ if (pb->seekable) { ffm->file_size = avio_size(pb); if (ffm->write_index && 0) adjust_write_index(s); } else { ffm->file_size = (UINT64_C(1) << 63) - 1; nb_streams = avio_rb32(pb); avio_rb32(pb); /* total bitrate */ /* read each stream */ for(i=0;i<nb_streams;i++) { char rc_eq_buf[128]; st = avformat_new_stream(s, NULL); if (!st) avpriv_set_pts_info(st, 64, 1, 1000000); codec = st->codec; /* generic info */ codec->codec_id = avio_rb32(pb); codec_desc = avcodec_descriptor_get(codec->codec_id); if (!codec_desc) { av_log(s, AV_LOG_ERROR, "Invalid codec id: %d\n", codec->codec_id); codec->codec_id = AV_CODEC_ID_NONE; codec->codec_type = avio_r8(pb); /* codec_type */ if (codec->codec_type != codec_desc->type) { av_log(s, AV_LOG_ERROR, "Codec type mismatch: expected %d, found %d\n", codec_desc->type, codec->codec_type); codec->codec_id = AV_CODEC_ID_NONE; codec->codec_type = AVMEDIA_TYPE_UNKNOWN; codec->bit_rate = avio_rb32(pb); codec->flags = avio_rb32(pb); codec->flags2 = avio_rb32(pb); codec->debug = avio_rb32(pb); /* specific info */ switch(codec->codec_type) { case AVMEDIA_TYPE_VIDEO: codec->time_base.num = avio_rb32(pb); codec->time_base.den = avio_rb32(pb); if (codec->time_base.num <= 0 || codec->time_base.den <= 0) { av_log(s, AV_LOG_ERROR, "Invalid time base %d/%d\n", codec->time_base.num, codec->time_base.den); codec->width = avio_rb16(pb); codec->height = avio_rb16(pb); codec->gop_size = avio_rb16(pb); codec->pix_fmt = avio_rb32(pb); codec->qmin = avio_r8(pb); codec->qmax = avio_r8(pb); codec->max_qdiff = avio_r8(pb); codec->qcompress = avio_rb16(pb) / 10000.0; codec->qblur = avio_rb16(pb) / 10000.0; codec->bit_rate_tolerance = avio_rb32(pb); avio_get_str(pb, INT_MAX, rc_eq_buf, sizeof(rc_eq_buf)); codec->rc_eq = av_strdup(rc_eq_buf); codec->rc_max_rate = avio_rb32(pb); codec->rc_min_rate = avio_rb32(pb); codec->rc_buffer_size = avio_rb32(pb); codec->i_quant_factor = av_int2double(avio_rb64(pb)); codec->b_quant_factor = av_int2double(avio_rb64(pb)); codec->i_quant_offset = av_int2double(avio_rb64(pb)); codec->b_quant_offset = av_int2double(avio_rb64(pb)); codec->dct_algo = avio_rb32(pb); codec->strict_std_compliance = avio_rb32(pb); codec->max_b_frames = avio_rb32(pb); codec->mpeg_quant = avio_rb32(pb); codec->intra_dc_precision = avio_rb32(pb); codec->me_method = avio_rb32(pb); codec->mb_decision = avio_rb32(pb); codec->nsse_weight = avio_rb32(pb); codec->frame_skip_cmp = avio_rb32(pb); codec->rc_buffer_aggressivity = av_int2double(avio_rb64(pb)); codec->codec_tag = avio_rb32(pb); codec->thread_count = avio_r8(pb); codec->coder_type = avio_rb32(pb); codec->me_cmp = avio_rb32(pb); codec->me_subpel_quality = avio_rb32(pb); codec->me_range = avio_rb32(pb); codec->keyint_min = avio_rb32(pb); codec->scenechange_threshold = avio_rb32(pb); codec->b_frame_strategy = avio_rb32(pb); codec->qcompress = av_int2double(avio_rb64(pb)); codec->qblur = av_int2double(avio_rb64(pb)); codec->max_qdiff = avio_rb32(pb); codec->refs = avio_rb32(pb); break; case AVMEDIA_TYPE_AUDIO: codec->sample_rate = avio_rb32(pb); codec->channels = avio_rl16(pb); codec->frame_size = avio_rl16(pb); break; default: if (codec->flags & AV_CODEC_FLAG_GLOBAL_HEADER) { int size = avio_rb32(pb); codec->extradata = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE); if (!codec->extradata) return AVERROR(ENOMEM); codec->extradata_size = size; avio_read(pb, codec->extradata, size); avcodec_parameters_from_context(st->codecpar, codec); /* get until end of block reached */ while ((avio_tell(pb) % ffm->packet_size) != 0 && !pb->eof_reached) avio_r8(pb); /* init packet demux */ ffm->packet_ptr = ffm->packet; ffm->packet_end = ffm->packet; ffm->frame_offset = 0; ffm->dts = 0; ffm->read_state = READ_HEADER; ffm->first_packet = 1; return 0; fail: ffm_close(s); return -1;