mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
|
|
* Creative Voice File demuxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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 "voc.h"
|
|
|
|
|
|
static int voc_probe(AVProbeData *p)
|
|
{
|
|
int version, check;
|
|
|
|
if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
|
|
return 0;
|
|
version = AV_RL16(p->buf + 22);
|
|
check = AV_RL16(p->buf + 24);
|
|
if (~version + 0x1234 != check)
|
|
return 10;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
voc_dec_context_t *voc = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int header_size;
|
|
AVStream *st;
|
|
|
|
url_fskip(pb, 20);
|
|
header_size = get_le16(pb) - 22;
|
|
if (header_size != 4) {
|
|
av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
url_fskip(pb, header_size);
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
|
|
voc->remaining_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
|
|
{
|
|
voc_dec_context_t *voc = s->priv_data;
|
|
AVCodecContext *dec = st->codec;
|
|
ByteIOContext *pb = &s->pb;
|
|
voc_type_t type;
|
|
int size;
|
|
int sample_rate = 0;
|
|
int channels = 1;
|
|
|
|
while (!voc->remaining_size) {
|
|
type = get_byte(pb);
|
|
if (type == VOC_TYPE_EOF)
|
|
return AVERROR(EIO);
|
|
voc->remaining_size = get_le24(pb);
|
|
max_size -= 4;
|
|
|
|
switch (type) {
|
|
case VOC_TYPE_VOICE_DATA:
|
|
dec->sample_rate = 1000000 / (256 - get_byte(pb));
|
|
if (sample_rate)
|
|
dec->sample_rate = sample_rate;
|
|
dec->channels = channels;
|
|
dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
|
|
dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
|
|
voc->remaining_size -= 2;
|
|
max_size -= 2;
|
|
channels = 1;
|
|
break;
|
|
|
|
case VOC_TYPE_VOICE_DATA_CONT:
|
|
break;
|
|
|
|
case VOC_TYPE_EXTENDED:
|
|
sample_rate = get_le16(pb);
|
|
get_byte(pb);
|
|
channels = get_byte(pb) + 1;
|
|
sample_rate = 256000000 / (channels * (65536 - sample_rate));
|
|
voc->remaining_size = 0;
|
|
max_size -= 4;
|
|
break;
|
|
|
|
case VOC_TYPE_NEW_VOICE_DATA:
|
|
dec->sample_rate = get_le32(pb);
|
|
dec->bits_per_sample = get_byte(pb);
|
|
dec->channels = get_byte(pb);
|
|
dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
|
|
url_fskip(pb, 4);
|
|
voc->remaining_size -= 12;
|
|
max_size -= 12;
|
|
break;
|
|
|
|
default:
|
|
url_fskip(pb, voc->remaining_size);
|
|
max_size -= voc->remaining_size;
|
|
voc->remaining_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
|
|
|
|
if (max_size <= 0)
|
|
max_size = 2048;
|
|
size = FFMIN(voc->remaining_size, max_size);
|
|
voc->remaining_size -= size;
|
|
return av_get_packet(pb, pkt, size);
|
|
}
|
|
|
|
static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
return voc_get_packet(s, pkt, s->streams[0], 0);
|
|
}
|
|
|
|
AVInputFormat voc_demuxer = {
|
|
"voc",
|
|
"Creative Voice File format",
|
|
sizeof(voc_dec_context_t),
|
|
voc_probe,
|
|
voc_read_header,
|
|
voc_read_packet,
|
|
.codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},
|
|
};
|