static int celt_header(AVFormatContext *s, int idx) { struct ogg *ogg = s->priv_data; struct ogg_stream *os = ogg->streams + idx; AVStream *st = s->streams[idx]; struct oggcelt_private *priv = os->private; uint8_t *p = os->buf + os->pstart; if (os->psize == 60 && !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) { /* Main header */ uint32_t version, sample_rate, nb_channels; uint32_t overlap, extra_headers; priv = av_malloc(sizeof(struct oggcelt_private)); if (!priv) return AVERROR(ENOMEM); if (ff_alloc_extradata(st->codecpar, 2 * sizeof(uint32_t)) < 0) { av_free(priv); return AVERROR(ENOMEM); } version = AV_RL32(p + 28); /* unused header size field skipped */ sample_rate = AV_RL32(p + 36); nb_channels = AV_RL32(p + 40); overlap = AV_RL32(p + 48); /* unused bytes per packet field skipped */ extra_headers = AV_RL32(p + 56); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_CELT; st->codecpar->sample_rate = sample_rate; st->codecpar->channels = nb_channels; if (sample_rate) avpriv_set_pts_info(st, 64, 1, sample_rate); priv->extra_headers_left = 1 + extra_headers; av_free(os->private); os->private = priv; AV_WL32(st->codecpar->extradata + 0, overlap); AV_WL32(st->codecpar->extradata + 4, version); return 1; } else if (priv && priv->extra_headers_left) { /* Extra headers (vorbiscomment) */ ff_vorbis_stream_comment(s, st, p, os->psize); priv->extra_headers_left--; return 1; } else { return 0; } }