FFmpeg
sol.c
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1 /*
2  * Sierra SOL demuxer
3  * Copyright Konstantin Shishkov
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 /*
23  * Based on documents from Game Audio Player and own research
24  */
25 
27 #include "libavutil/intreadwrite.h"
28 #include "avformat.h"
29 #include "demux.h"
30 #include "internal.h"
31 #include "pcm.h"
32 
33 /* if we don't know the size in advance */
34 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
35 
36 static int sol_probe(const AVProbeData *p)
37 {
38  /* check file header */
39  uint16_t magic = AV_RL32(p->buf);
40  if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
41  p->buf[2] == 'S' && p->buf[3] == 'O' &&
42  p->buf[4] == 'L' && p->buf[5] == 0)
43  return AVPROBE_SCORE_MAX;
44  else
45  return 0;
46 }
47 
48 #define SOL_DPCM 1
49 #define SOL_16BIT 4
50 #define SOL_STEREO 16
51 
52 static enum AVCodecID sol_codec_id(int magic, int type)
53 {
54  if (type & SOL_DPCM)
55  return AV_CODEC_ID_SOL_DPCM;
56 
57  if (magic == 0x0B8D)
58  return AV_CODEC_ID_PCM_U8;
59 
60  if (type & SOL_16BIT)
61  return AV_CODEC_ID_PCM_S16LE;
62 
63  return AV_CODEC_ID_PCM_U8;
64 }
65 
66 static int sol_codec_type(int magic, int type)
67 {
68  if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
69  if (type & SOL_DPCM)
70  {
71  if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
72  else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
73  else return 2;//SOL_DPCM_NEW8;
74  }
75  return -1;
76 }
77 
78 static int sol_channels(int magic, int type)
79 {
80  if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
81  return 2;
82 }
83 
85 {
86  unsigned int magic,tag;
87  AVIOContext *pb = s->pb;
88  unsigned int id, channels, rate, type;
89  enum AVCodecID codec;
90  AVStream *st;
91 
92  /* check ".snd" header */
93  magic = avio_rl16(pb);
94  tag = avio_rl32(pb);
95  if (tag != MKTAG('S', 'O', 'L', 0))
96  return -1;
97  rate = avio_rl16(pb);
98  type = avio_r8(pb);
99  avio_skip(pb, 4); /* size */
100  if (magic != 0x0B8D)
101  avio_r8(pb); /* newer SOLs contain padding byte */
102 
103  codec = sol_codec_id(magic, type);
104  channels = sol_channels(magic, type);
105 
106  if (codec == AV_CODEC_ID_SOL_DPCM)
107  id = sol_codec_type(magic, type);
108  else id = 0;
109 
110  /* now we are ready: build format streams */
111  st = avformat_new_stream(s, NULL);
112  if (!st)
113  return -1;
115  st->codecpar->codec_tag = id;
116  st->codecpar->codec_id = codec;
118  st->codecpar->sample_rate = rate;
119  avpriv_set_pts_info(st, 64, 1, rate);
120  return 0;
121 }
122 
123 #define MAX_SIZE 4096
124 
126  AVPacket *pkt)
127 {
128  int ret;
129 
130  if (avio_feof(s->pb))
131  return AVERROR_EOF;
132 
133  ret= av_get_packet(s->pb, pkt, MAX_SIZE);
134  if (ret < 0)
135  return ret;
137  pkt->stream_index = 0;
138  return 0;
139 }
140 
142  .p.name = "sol",
143  .p.long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"),
144  .read_probe = sol_probe,
145  .read_header = sol_read_header,
146  .read_packet = sol_read_packet,
147  .read_seek = ff_pcm_read_seek,
148 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:328
sol_channels
static int sol_channels(int magic, int type)
Definition: sol.c:78
pcm.h
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
sol_probe
static int sol_probe(const AVProbeData *p)
Definition: sol.c:36
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_CODEC_ID_SOL_DPCM
@ AV_CODEC_ID_SOL_DPCM
Definition: codec_id.h:432
sol_read_packet
static int sol_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sol.c:125
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:59
sol_codec_type
static int sol_codec_type(int magic, int type)
Definition: sol.c:66
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:853
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:713
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:578
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
MAX_SIZE
#define MAX_SIZE
Definition: sol.c:123
SOL_STEREO
#define SOL_STEREO
Definition: sol.c:50
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
channels
channels
Definition: aptx.h:31
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
NULL
#define NULL
Definition: coverity.c:32
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:729
AVIOContext
Bytestream IO Context.
Definition: avio.h:160
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
sol_codec_id
static enum AVCodecID sol_codec_id(int magic, int type)
Definition: sol.c:52
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:602
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:528
av_channel_layout_default
void av_channel_layout_default(AVChannelLayout *ch_layout, int nb_channels)
Get the default channel layout for a given number of channels.
Definition: channel_layout.c:830
SOL_DPCM
#define SOL_DPCM
Definition: sol.c:48
demux.h
av_get_packet
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:103
ff_sol_demuxer
const FFInputFormat ff_sol_demuxer
Definition: sol.c:141
tag
uint32_t tag
Definition: movenc.c:1786
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
ff_pcm_read_seek
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:73
avformat.h
id
enum AVCodecID id
Definition: dts2pts.c:364
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
channel_layout.h
AVPacket::stream_index
int stream_index
Definition: packet.h:524
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:317
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:333
sol_read_header
static int sol_read_header(AVFormatContext *s)
Definition: sol.c:84
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
FFInputFormat
Definition: demux.h:37
SOL_16BIT
#define SOL_16BIT
Definition: sol.c:49
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:345