mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 4967 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Aurelien Jacobs
19 years ago
parent
9b2283cc33
commit
ea395e8c6c
12 changed files with 347 additions and 3 deletions
@ -0,0 +1,280 @@ |
||||
/*
|
||||
* 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_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; |
||||
} |
||||
|
||||
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)); |
||||
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; |
||||
} |
||||
@ -0,0 +1,32 @@ |
||||
/*
|
||||
* 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 |
||||
*/ |
||||
|
||||
#ifndef VOC_H |
||||
#define VOC_H |
||||
|
||||
#include "avformat.h" |
||||
|
||||
typedef struct voc_dec_context { |
||||
int remaining_size; |
||||
} voc_dec_context_t; |
||||
|
||||
int voc_get_packet(AVFormatContext *s, AVPacket *pkt, |
||||
AVStream *st, int max_size); |
||||
|
||||
#endif |
||||
Loading…
Reference in new issue