mirror of https://git.ffmpeg.org/ffmpeg.git
297 lines
7.8 KiB
C
297 lines
7.8 KiB
C
/*
|
|
* Creative Voice File demuxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "avi.h" /* for CodecTag */
|
|
#include "voc.h"
|
|
|
|
|
|
typedef enum voc_type {
|
|
VOC_TYPE_EOF = 0x00,
|
|
VOC_TYPE_VOICE_DATA = 0x01,
|
|
VOC_TYPE_VOICE_DATA_CONT = 0x02,
|
|
VOC_TYPE_SILENCE = 0x03,
|
|
VOC_TYPE_MARKER = 0x04,
|
|
VOC_TYPE_ASCII = 0x05,
|
|
VOC_TYPE_REPETITION_START = 0x06,
|
|
VOC_TYPE_REPETITION_END = 0x07,
|
|
VOC_TYPE_EXTENDED = 0x08,
|
|
VOC_TYPE_NEW_VOICE_DATA = 0x09,
|
|
} voc_type_t;
|
|
|
|
|
|
static const int voc_max_pkt_size = 2048;
|
|
static const unsigned char voc_magic[] = "Creative Voice File\x1A";
|
|
|
|
static const CodecTag voc_codec_tags[] = {
|
|
{CODEC_ID_PCM_U8, 0x00},
|
|
{CODEC_ID_ADPCM_SBPRO_4, 0x01},
|
|
{CODEC_ID_ADPCM_SBPRO_3, 0x02},
|
|
{CODEC_ID_ADPCM_SBPRO_2, 0x03},
|
|
{CODEC_ID_PCM_S16LE, 0x04},
|
|
{CODEC_ID_PCM_ALAW, 0x06},
|
|
{CODEC_ID_PCM_MULAW, 0x07},
|
|
{CODEC_ID_ADPCM_CT, 0x0200},
|
|
{0, 0},
|
|
};
|
|
|
|
|
|
#ifdef CONFIG_DEMUXERS
|
|
|
|
static int voc_probe(AVProbeData *p)
|
|
{
|
|
int version, check;
|
|
|
|
if (p->buf_size < 26)
|
|
return 0;
|
|
if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
|
|
return 0;
|
|
version = p->buf[22] | (p->buf[23] << 8);
|
|
check = p->buf[24] | (p->buf[25] << 8);
|
|
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, "unkown header size: %d\n", header_size);
|
|
return AVERROR_NOTSUPP;
|
|
}
|
|
url_fskip(pb, header_size);
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR_NOMEM;
|
|
st->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
|
|
voc->remaining_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int voc_get_bps(int codec_id)
|
|
{
|
|
switch (codec_id) {
|
|
case CODEC_ID_PCM_S16LE:
|
|
return 16;
|
|
case CODEC_ID_ADPCM_CT:
|
|
return 4;
|
|
default:
|
|
return 8;
|
|
}
|
|
}
|
|
|
|
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_IO;
|
|
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 = voc_get_bps(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 = voc_max_pkt_size;
|
|
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);
|
|
}
|
|
|
|
static int voc_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat voc_iformat = {
|
|
"voc",
|
|
"Creative Voice File format",
|
|
sizeof(voc_dec_context_t),
|
|
voc_probe,
|
|
voc_read_header,
|
|
voc_read_packet,
|
|
voc_read_close,
|
|
};
|
|
|
|
#endif /* CONFIG_DEMUXERS */
|
|
|
|
|
|
#ifdef CONFIG_MUXERS
|
|
|
|
typedef struct voc_enc_context {
|
|
int param_written;
|
|
} voc_enc_context_t;
|
|
|
|
static int voc_write_header(AVFormatContext *s)
|
|
{
|
|
ByteIOContext *pb = &s->pb;
|
|
const int header_size = 26;
|
|
const int version = 0x0114;
|
|
|
|
if (s->nb_streams != 1
|
|
|| s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
|
|
return AVERROR_NOTSUPP;
|
|
|
|
put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
|
|
put_le16(pb, header_size);
|
|
put_le16(pb, version);
|
|
put_le16(pb, ~version + 0x1234);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
voc_enc_context_t *voc = s->priv_data;
|
|
AVCodecContext *enc = s->streams[0]->codec;
|
|
ByteIOContext *pb = &s->pb;
|
|
|
|
if (!voc->param_written) {
|
|
int format = codec_get_tag(voc_codec_tags, enc->codec_id);
|
|
|
|
if (format > 0xFF) {
|
|
put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
|
|
put_le24(pb, pkt->size + 12);
|
|
put_le32(pb, enc->sample_rate);
|
|
put_byte(pb, enc->bits_per_sample);
|
|
put_byte(pb, enc->channels);
|
|
put_le16(pb, format);
|
|
put_le32(pb, 0);
|
|
} else {
|
|
if (s->streams[0]->codec->channels > 1) {
|
|
put_byte(pb, VOC_TYPE_EXTENDED);
|
|
put_le24(pb, 4);
|
|
put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
|
|
put_byte(pb, format);
|
|
put_byte(pb, enc->channels - 1);
|
|
}
|
|
put_byte(pb, VOC_TYPE_VOICE_DATA);
|
|
put_le24(pb, pkt->size + 2);
|
|
put_byte(pb, 256 - 1000000 / enc->sample_rate);
|
|
put_byte(pb, format);
|
|
}
|
|
voc->param_written = 1;
|
|
} else {
|
|
put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
|
|
put_le24(pb, pkt->size);
|
|
}
|
|
|
|
put_buffer(pb, pkt->data, pkt->size);
|
|
return 0;
|
|
}
|
|
|
|
static int voc_write_trailer(AVFormatContext *s)
|
|
{
|
|
put_byte(&s->pb, 0);
|
|
return 0;
|
|
}
|
|
|
|
static AVOutputFormat voc_oformat = {
|
|
"voc",
|
|
"Creative Voice File format",
|
|
"audio/x-voc",
|
|
"voc",
|
|
sizeof(voc_enc_context_t),
|
|
CODEC_ID_PCM_U8,
|
|
CODEC_ID_NONE,
|
|
voc_write_header,
|
|
voc_write_packet,
|
|
voc_write_trailer,
|
|
};
|
|
|
|
#endif /* CONFIG_MUXERS */
|
|
|
|
|
|
int voc_init(void)
|
|
{
|
|
#ifdef CONFIG_DEMUXERS
|
|
av_register_input_format(&voc_iformat);
|
|
#endif /* CONFIG_DEMUXERS */
|
|
#ifdef CONFIG_MUXERS
|
|
av_register_output_format(&voc_oformat);
|
|
#endif /* CONFIG_MUXERS */
|
|
return 0;
|
|
}
|