/*
* PCM parser for Ogg
* Copyright (c) 2013 James Almer
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"
struct oggpcm_private {
int vorbis_comment;
uint32_t extra_headers;
};
static const struct ogg_pcm_codec {
uint32_t codec_id;
uint32_t format_id;
} ogg_pcm_codecs[] = {
{ AV_CODEC_ID_PCM_S8, 0x00 },
{ AV_CODEC_ID_PCM_U8, 0x01 },
{ AV_CODEC_ID_PCM_S16LE, 0x02 },
{ AV_CODEC_ID_PCM_S16BE, 0x03 },
{ AV_CODEC_ID_PCM_S24LE, 0x04 },
{ AV_CODEC_ID_PCM_S24BE, 0x05 },
{ AV_CODEC_ID_PCM_S32LE, 0x06 },
{ AV_CODEC_ID_PCM_S32BE, 0x07 },
{ AV_CODEC_ID_PCM_F32LE, 0x20 },
{ AV_CODEC_ID_PCM_F32BE, 0x21 },
{ AV_CODEC_ID_PCM_F64LE, 0x22 },
{ AV_CODEC_ID_PCM_F64BE, 0x23 },
};
static const struct ogg_pcm_codec *ogg_get_pcm_codec_id(uint32_t format_id)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(ogg_pcm_codecs); i++)
if (ogg_pcm_codecs[i].format_id == format_id)
return &ogg_pcm_codecs[i];
return NULL;
}
static int pcm_header(AVFormatContext * s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
struct oggpcm_private *priv = os->private;
const struct ogg_pcm_codec *pcm;
AVStream *st = s->streams[idx];
uint8_t *p = os->buf + os->pstart;
uint16_t major, minor;
uint32_t format_id;
if (os->flags & OGG_FLAG_BOS) {
if (os->psize < 28) {
av_log(s, AV_LOG_ERROR, "Invalid OggPCM header packet");
return -1;
}
major = AV_RL16(p + 8);
minor = AV_RL16(p + 10);
if (major < 1 || major > 255) {
av_log(s, AV_LOG_ERROR, "Unsupported OggPCM version %u.%u\n", major, minor);
return -1;
}
format_id = AV_RL32(p + 12);
pcm = ogg_get_pcm_codec_id(format_id);
if (!pcm) {
av_log(s, AV_LOG_ERROR, "Unsupported PCM format ID 0x%X\n", format_id);
return -1;
}
priv = os->private = av_mallocz(sizeof(*priv));
if (!priv)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = pcm->codec_id;
st->codec->sample_rate = AV_RL32(p + 16);
st->codec->channels = AV_RL8 (p + 21);
priv->extra_headers = AV_RL32(p + 24);
priv->vorbis_comment = 1;
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
} else if (priv && priv->vorbis_comment) {
ff_vorbis_comment(s, &st->metadata, p, os->psize, 0);
priv->vorbis_comment = 0;
} else if (priv && priv->extra_headers) {
// TODO: Support for channel mapping and conversion headers.
priv->extra_headers--;
} else
return 0;
return 1;
}
const struct ogg_codec ff_pcm_codec = {
.magic = "PCM ",
.magicsize = 8,
.header = pcm_header,
.nb_header = 2,
};
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