mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 11:39:47 +00:00
176 lines
5.3 KiB
C
176 lines
5.3 KiB
C
/*
|
|
* Creative Voice File demuxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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 "libavutil/intreadwrite.h"
|
|
#include "voc.h"
|
|
#include "internal.h"
|
|
|
|
|
|
static int voc_probe(AVProbeData *p)
|
|
{
|
|
int version, check;
|
|
|
|
if (memcmp(p->buf, ff_voc_magic, sizeof(ff_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)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int header_size;
|
|
AVStream *st;
|
|
|
|
avio_skip(pb, 20);
|
|
header_size = avio_rl16(pb) - 22;
|
|
if (header_size != 4) {
|
|
av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
avio_skip(pb, header_size);
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
|
|
voc->remaining_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVCodecContext *dec = st->codec;
|
|
AVIOContext *pb = s->pb;
|
|
VocType type;
|
|
int size, tmp_codec=-1;
|
|
int sample_rate = 0;
|
|
int channels = 1;
|
|
|
|
while (!voc->remaining_size) {
|
|
type = avio_r8(pb);
|
|
if (type == VOC_TYPE_EOF)
|
|
return AVERROR(EIO);
|
|
voc->remaining_size = avio_rl24(pb);
|
|
if (!voc->remaining_size) {
|
|
if (!s->pb->seekable)
|
|
return AVERROR(EIO);
|
|
voc->remaining_size = avio_size(pb) - avio_tell(pb);
|
|
}
|
|
max_size -= 4;
|
|
|
|
switch (type) {
|
|
case VOC_TYPE_VOICE_DATA:
|
|
if (!dec->sample_rate) {
|
|
dec->sample_rate = 1000000 / (256 - avio_r8(pb));
|
|
if (sample_rate)
|
|
dec->sample_rate = sample_rate;
|
|
avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
|
|
} else
|
|
avio_skip(pb, 1);
|
|
dec->channels = channels;
|
|
tmp_codec = avio_r8(pb);
|
|
dec->bits_per_coded_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 = avio_rl16(pb);
|
|
avio_r8(pb);
|
|
channels = avio_r8(pb) + 1;
|
|
sample_rate = 256000000 / (channels * (65536 - sample_rate));
|
|
voc->remaining_size = 0;
|
|
max_size -= 4;
|
|
break;
|
|
|
|
case VOC_TYPE_NEW_VOICE_DATA:
|
|
if (!dec->sample_rate) {
|
|
dec->sample_rate = avio_rl32(pb);
|
|
avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
|
|
} else
|
|
avio_skip(pb, 4);
|
|
dec->bits_per_coded_sample = avio_r8(pb);
|
|
dec->channels = avio_r8(pb);
|
|
tmp_codec = avio_rl16(pb);
|
|
avio_skip(pb, 4);
|
|
voc->remaining_size -= 12;
|
|
max_size -= 12;
|
|
break;
|
|
|
|
default:
|
|
avio_skip(pb, voc->remaining_size);
|
|
max_size -= voc->remaining_size;
|
|
voc->remaining_size = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (tmp_codec >= 0) {
|
|
tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
|
|
if (dec->codec_id == AV_CODEC_ID_NONE)
|
|
dec->codec_id = tmp_codec;
|
|
else if (dec->codec_id != tmp_codec)
|
|
av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
|
|
if (dec->codec_id == AV_CODEC_ID_NONE) {
|
|
if (s->audio_codec_id == AV_CODEC_ID_NONE) {
|
|
av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
|
|
}
|
|
}
|
|
|
|
dec->bit_rate = dec->sample_rate * dec->bits_per_coded_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 ff_voc_get_packet(s, pkt, s->streams[0], 0);
|
|
}
|
|
|
|
AVInputFormat ff_voc_demuxer = {
|
|
.name = "voc",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
|
|
.priv_data_size = sizeof(VocDecContext),
|
|
.read_probe = voc_probe,
|
|
.read_header = voc_read_header,
|
|
.read_packet = voc_read_packet,
|
|
.codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
|
|
};
|