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vocenc.c
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1 /*
2  * Creative Voice File muxer.
3  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "voc.h"
23 #include "internal.h"
24 
25 
26 typedef struct voc_enc_context {
29 
31 {
32  AVIOContext *pb = s->pb;
33  AVCodecParameters *par = s->streams[0]->codecpar;
34  const int header_size = 26;
35  const int version = 0x0114;
36 
37  if (s->nb_streams != 1
39  return AVERROR_PATCHWELCOME;
40 
41  if (!par->codec_tag && par->codec_id != AV_CODEC_ID_PCM_U8) {
42  av_log(s, AV_LOG_ERROR, "unsupported codec\n");
43  return AVERROR(EINVAL);
44  }
45 
46  avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
47  avio_wl16(pb, header_size);
48  avio_wl16(pb, version);
49  avio_wl16(pb, ~version + 0x1234);
50 
51  return 0;
52 }
53 
55 {
56  VocEncContext *voc = s->priv_data;
57  AVCodecParameters *par = s->streams[0]->codecpar;
58  AVIOContext *pb = s->pb;
59 
60  if (!voc->param_written) {
61  if (par->codec_tag > 3) {
63  avio_wl24(pb, pkt->size + 12);
64  avio_wl32(pb, par->sample_rate);
66  avio_w8(pb, par->channels);
67  avio_wl16(pb, par->codec_tag);
68  avio_wl32(pb, 0);
69  } else {
70  if (s->streams[0]->codecpar->channels > 1) {
72  avio_wl24(pb, 4);
73  avio_wl16(pb, 65536-(256000000 + par->sample_rate*par->channels/2)/(par->sample_rate*par->channels));
74  avio_w8(pb, par->codec_tag);
75  avio_w8(pb, par->channels - 1);
76  }
78  avio_wl24(pb, pkt->size + 2);
79  avio_w8(pb, 256 - (1000000 + par->sample_rate/2) / par->sample_rate);
80  avio_w8(pb, par->codec_tag);
81  }
82  voc->param_written = 1;
83  } else {
85  avio_wl24(pb, pkt->size);
86  }
87 
88  avio_write(pb, pkt->data, pkt->size);
89  return 0;
90 }
91 
93 {
94  avio_w8(s->pb, 0);
95  return 0;
96 }
97 
99  .name = "voc",
100  .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
101  .mime_type = "audio/x-voc",
102  .extensions = "voc",
103  .priv_data_size = sizeof(VocEncContext),
104  .audio_codec = AV_CODEC_ID_PCM_S16LE,
105  .video_codec = AV_CODEC_ID_NONE,
109  .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
110  .flags = AVFMT_NOTIMESTAMPS,
111 };
void avio_wl16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:429
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
int param_written
Definition: vocenc.c:27
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
int size
Definition: avcodec.h:1578
static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vocenc.c:54
int version
Definition: avisynth_c.h:629
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3907
Format I/O context.
Definition: avformat.h:1319
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:329
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1387
AVOutputFormat ff_voc_muxer
Definition: vocenc.c:98
uint8_t * data
Definition: avcodec.h:1577
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:187
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3911
static int voc_write_trailer(AVFormatContext *s)
Definition: vocenc.c:92
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1375
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:94
const char * name
Definition: avformat.h:522
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:484
const AVCodecTag ff_voc_codec_tags[]
Definition: voc.c:27
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:165
void avio_wl24(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:441
const unsigned char ff_voc_magic[21]
Definition: voc.c:25
int sample_rate
Audio only.
Definition: avcodec.h:4025
void * priv_data
Format private data.
Definition: avformat.h:1347
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:497
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:3957
int channels
Audio only.
Definition: avcodec.h:4021
AVCodecParameters * codecpar
Definition: avformat.h:1006
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3919
static int voc_write_header(AVFormatContext *s)
Definition: vocenc.c:30
This structure stores compressed data.
Definition: avcodec.h:1554
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:86