/* * Xiph CELT / Opus parser for Ogg * Copyright (c) 2011 Nicolas George * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <string.h> #include "libavutil/intreadwrite.h" #include "avformat.h" #include "internal.h" #include "oggdec.h" struct oggcelt_private { int extra_headers_left; }; 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, frame_size; uint32_t overlap, extra_headers; uint8_t *extradata; extradata = av_malloc(2 * sizeof(uint32_t) + FF_INPUT_BUFFER_PADDING_SIZE); priv = av_malloc(sizeof(struct oggcelt_private)); if (!extradata || !priv) { av_free(extradata); 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); frame_size = AV_RL32(p + 44); overlap = AV_RL32(p + 48); /* unused bytes per packet field skipped */ extra_headers = AV_RL32(p + 56); av_free(os->private); av_free(st->codec->extradata); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_CELT; st->codec->sample_rate = sample_rate; st->codec->channels = nb_channels; st->codec->frame_size = frame_size; st->codec->extradata = extradata; st->codec->extradata_size = 2 * sizeof(uint32_t); if (sample_rate) avpriv_set_pts_info(st, 64, 1, sample_rate); priv->extra_headers_left = 1 + extra_headers; os->private = priv; AV_WL32(extradata + 0, overlap); AV_WL32(extradata + 4, version); return 1; } else if (priv && priv->extra_headers_left) { /* Extra headers (vorbiscomment) */ ff_vorbis_comment(s, &st->metadata, p, os->psize); priv->extra_headers_left--; return 1; } else { return 0; } } const struct ogg_codec ff_celt_codec = { .magic = "CELT ", .magicsize = 8, .header = celt_header, };