static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap) { FFMContext *ffm = s->priv_data; AVStream *st; ByteIOContext *pb = s->pb; AVCodecContext *codec; int i, nb_streams; uint32_t tag; /* header */ tag = get_le32(pb); if (tag != MKTAG('F', 'F', 'M', '1')) goto fail; ffm->packet_size = get_be32(pb); if (ffm->packet_size != FFM_PACKET_SIZE) goto fail; ffm->write_index = get_be64(pb); /* get also filesize */ if (!url_is_streamed(pb)) { ffm->file_size = url_fsize(pb); if (ffm->write_index) adjust_write_index(s); } else { ffm->file_size = (UINT64_C(1) << 63) - 1; } nb_streams = get_be32(pb); get_be32(pb); /* total bitrate */ /* read each stream */ for(i=0;i<nb_streams;i++) { char rc_eq_buf[128]; st = av_new_stream(s, 0); if (!st) goto fail; av_set_pts_info(st, 64, 1, 1000000); codec = st->codec; /* generic info */ codec->codec_id = get_be32(pb); codec->codec_type = get_byte(pb); /* codec_type */ codec->bit_rate = get_be32(pb); st->quality = get_be32(pb); codec->flags = get_be32(pb); codec->flags2 = get_be32(pb); codec->debug = get_be32(pb); /* specific info */ switch(codec->codec_type) { case CODEC_TYPE_VIDEO: codec->time_base.num = get_be32(pb); codec->time_base.den = get_be32(pb); codec->width = get_be16(pb); codec->height = get_be16(pb); codec->gop_size = get_be16(pb); codec->pix_fmt = get_be32(pb); codec->qmin = get_byte(pb); codec->qmax = get_byte(pb); codec->max_qdiff = get_byte(pb); codec->qcompress = get_be16(pb) / 10000.0; codec->qblur = get_be16(pb) / 10000.0; codec->bit_rate_tolerance = get_be32(pb); codec->rc_eq = av_strdup(get_strz(pb, rc_eq_buf, sizeof(rc_eq_buf))); codec->rc_max_rate = get_be32(pb); codec->rc_min_rate = get_be32(pb); codec->rc_buffer_size = get_be32(pb); codec->i_quant_factor = av_int2dbl(get_be64(pb)); codec->b_quant_factor = av_int2dbl(get_be64(pb)); codec->i_quant_offset = av_int2dbl(get_be64(pb)); codec->b_quant_offset = av_int2dbl(get_be64(pb)); codec->dct_algo = get_be32(pb); codec->strict_std_compliance = get_be32(pb); codec->max_b_frames = get_be32(pb); codec->luma_elim_threshold = get_be32(pb); codec->chroma_elim_threshold = get_be32(pb); codec->mpeg_quant = get_be32(pb); codec->intra_dc_precision = get_be32(pb); codec->me_method = get_be32(pb); codec->mb_decision = get_be32(pb); codec->nsse_weight = get_be32(pb); codec->frame_skip_cmp = get_be32(pb); codec->rc_buffer_aggressivity = av_int2dbl(get_be64(pb)); codec->codec_tag = get_be32(pb); codec->thread_count = get_byte(pb); codec->coder_type = get_be32(pb); codec->me_cmp = get_be32(pb); codec->partitions = get_be32(pb); codec->me_subpel_quality = get_be32(pb); codec->me_range = get_be32(pb); codec->keyint_min = get_be32(pb); codec->scenechange_threshold = get_be32(pb); codec->b_frame_strategy = get_be32(pb); codec->qcompress = av_int2dbl(get_be64(pb)); codec->qblur = av_int2dbl(get_be64(pb)); codec->max_qdiff = get_be32(pb); codec->refs = get_be32(pb); codec->directpred = get_be32(pb); break; case CODEC_TYPE_AUDIO: codec->sample_rate = get_be32(pb); codec->channels = get_le16(pb); codec->frame_size = get_le16(pb); codec->sample_fmt = get_le16(pb); break; default: goto fail; } if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { codec->extradata_size = get_be32(pb); codec->extradata = av_malloc(codec->extradata_size); if (!codec->extradata) return AVERROR(ENOMEM); get_buffer(pb, codec->extradata, codec->extradata_size); } } /* get until end of block reached */ while ((url_ftell(pb) % ffm->packet_size) != 0) get_byte(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: for(i=0;i<s->nb_streams;i++) { st = s->streams[i]; if (st) { av_free(st); } } return -1; }