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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 "internal.h"
30 #include "pcm.h"
31 
32 /* if we don't know the size in advance */
33 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
34 
35 static int sol_probe(AVProbeData *p)
36 {
37  /* check file header */
38  uint16_t magic = AV_RL32(p->buf);
39  if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
40  p->buf[2] == 'S' && p->buf[3] == 'O' &&
41  p->buf[4] == 'L' && p->buf[5] == 0)
42  return AVPROBE_SCORE_MAX;
43  else
44  return 0;
45 }
46 
47 #define SOL_DPCM 1
48 #define SOL_16BIT 4
49 #define SOL_STEREO 16
50 
51 static enum AVCodecID sol_codec_id(int magic, int type)
52 {
53  if (type & SOL_DPCM)
54  return AV_CODEC_ID_SOL_DPCM;
55 
56  if (magic == 0x0B8D)
57  return AV_CODEC_ID_PCM_U8;
58 
59  if (type & SOL_16BIT)
60  return AV_CODEC_ID_PCM_S16LE;
61 
62  return AV_CODEC_ID_PCM_U8;
63 }
64 
65 static int sol_codec_type(int magic, int type)
66 {
67  if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
68  if (type & SOL_DPCM)
69  {
70  if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
71  else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
72  else return 2;//SOL_DPCM_NEW8;
73  }
74  return -1;
75 }
76 
77 static int sol_channels(int magic, int type)
78 {
79  if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
80  return 2;
81 }
82 
84 {
85  unsigned int magic,tag;
86  AVIOContext *pb = s->pb;
87  unsigned int id, channels, rate, type;
88  enum AVCodecID codec;
89  AVStream *st;
90 
91  /* check ".snd" header */
92  magic = avio_rl16(pb);
93  tag = avio_rl32(pb);
94  if (tag != MKTAG('S', 'O', 'L', 0))
95  return -1;
96  rate = avio_rl16(pb);
97  type = avio_r8(pb);
98  avio_skip(pb, 4); /* size */
99  if (magic != 0x0B8D)
100  avio_r8(pb); /* newer SOLs contain padding byte */
101 
102  codec = sol_codec_id(magic, type);
103  channels = sol_channels(magic, type);
104 
105  if (codec == AV_CODEC_ID_SOL_DPCM)
106  id = sol_codec_type(magic, type);
107  else id = 0;
108 
109  /* now we are ready: build format streams */
110  st = avformat_new_stream(s, NULL);
111  if (!st)
112  return -1;
114  st->codecpar->codec_tag = id;
115  st->codecpar->codec_id = codec;
116  st->codecpar->channels = channels;
117  st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
119  st->codecpar->sample_rate = rate;
120  avpriv_set_pts_info(st, 64, 1, rate);
121  return 0;
122 }
123 
124 #define MAX_SIZE 4096
125 
127  AVPacket *pkt)
128 {
129  int ret;
130 
131  if (avio_feof(s->pb))
132  return AVERROR(EIO);
133  ret= av_get_packet(s->pb, pkt, MAX_SIZE);
134  if (ret < 0)
135  return ret;
136  pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
137  pkt->stream_index = 0;
138  return 0;
139 }
140 
142  .name = "sol",
143  .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 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
Bytestream IO Context.
Definition: avio.h:111
enum AVCodecID id
Definition: mxfenc.c:104
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4404
AVInputFormat ff_sol_demuxer
Definition: sol.c:141
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3915
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:287
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
Format I/O context.
Definition: avformat.h:1319
#define SOL_16BIT
Definition: sol.c:48
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4042
#define SOL_STEREO
Definition: sol.c:49
uint32_t tag
Definition: movenc.c:1353
static int sol_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sol.c:126
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:260
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4017
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:189
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:672
#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
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1583
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:541
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:461
audio channel layout utility functions
static int sol_codec_type(int magic, int type)
Definition: sol.c:65
#define MAX_SIZE
Definition: sol.c:124
static int sol_read_header(AVFormatContext *s)
Definition: sol.c:83
static enum AVCodecID sol_codec_id(int magic, int type)
Definition: sol.c:51
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:45
Stream structure.
Definition: avformat.h:876
AVIOContext * pb
I/O context.
Definition: avformat.h:1361
GLint GLenum type
Definition: opengl_enc.c:105
static int sol_probe(AVProbeData *p)
Definition: sol.c:35
This structure contains the data a format has to probe a file.
Definition: avformat.h:459
int sample_rate
Audio only.
Definition: avcodec.h:4025
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:471
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:656
Main libavformat public API header.
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: avcodec.h:1610
static int sol_channels(int magic, int type)
Definition: sol.c:77
#define SOL_DPCM
Definition: sol.c:47
int channels
Audio only.
Definition: avcodec.h:4021
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:660
AVCodecParameters * codecpar
Definition: avformat.h:1006
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:311
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3919
int stream_index
Definition: avcodec.h:1579
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1554