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ffmpeg / libavformat / oggparsecelt.c @ 51c1e255

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/*
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 * Xiph CELT / Opus parser for Ogg
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 * Copyright (c) 2011 Nicolas George
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <string.h>
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#include "avformat.h"
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#include "oggdec.h"
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#include "libavutil/intreadwrite.h"
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struct oggcelt_private {
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    int extra_headers_left;
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};
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static int celt_header(AVFormatContext *s, int idx)
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{
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    struct ogg *ogg = s->priv_data;
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    struct ogg_stream *os = ogg->streams + idx;
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    AVStream *st = s->streams[idx];
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    struct oggcelt_private *priv = os->private;
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    uint8_t *p = os->buf + os->pstart;
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    if (os->psize == 60 &&
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        !memcmp(p, ff_celt_codec.magic, ff_celt_codec.magicsize)) {
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        /* Main header */
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        uint32_t version, header_size, sample_rate, nb_channels, frame_size;
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        uint32_t overlap, bytes_per_packet, extra_headers;
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        uint8_t *extradata;
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        extradata = av_malloc(2 * sizeof(uint32_t) +
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                              FF_INPUT_BUFFER_PADDING_SIZE);
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        priv = av_malloc(sizeof(struct oggcelt_private));
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        if (!extradata || !priv) {
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            av_free(extradata);
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            av_free(priv);
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            return AVERROR(ENOMEM);
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        }
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        version          = AV_RL32(p + 28);
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        header_size      = AV_RL32(p + 32); /* unused */
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        sample_rate      = AV_RL32(p + 36);
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        nb_channels      = AV_RL32(p + 40);
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        frame_size       = AV_RL32(p + 44);
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        overlap          = AV_RL32(p + 48);
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        bytes_per_packet = AV_RL32(p + 52); /* unused */
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        extra_headers    = AV_RL32(p + 56);
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        av_free(os->private);
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        av_free(st->codec->extradata);
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        st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
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        st->codec->codec_id       = CODEC_ID_CELT;
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        st->codec->sample_rate    = sample_rate;
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        st->codec->channels       = nb_channels;
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        st->codec->frame_size     = frame_size;
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        st->codec->sample_fmt     = AV_SAMPLE_FMT_S16;
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        st->codec->extradata      = extradata;
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        st->codec->extradata_size = 2 * sizeof(uint32_t);
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        av_set_pts_info(st, 64, 1, sample_rate);
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        priv->extra_headers_left  = 1 + extra_headers;
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        os->private = priv;
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        AV_WL32(extradata + 0, overlap);
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        AV_WL32(extradata + 4, version);
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        return 1;
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    } else if(priv && priv->extra_headers_left) {
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        /* Extra headers (vorbiscomment) */
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        ff_vorbis_comment(s, &st->metadata, p, os->psize);
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        priv->extra_headers_left--;
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        return 1;
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    } else {
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        return 0;
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    }
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}
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const struct ogg_codec ff_celt_codec = {
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    .magic     = "CELT    ",
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    .magicsize = 8,
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    .header    = celt_header,
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};