FFmpeg  4.4
musx.c
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1 /*
2  * MUSX demuxer
3  * Copyright (c) 2016 Paul B Mahol
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 "libavutil/avassert.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26 
27 static int musx_probe(const AVProbeData *p)
28 {
29  unsigned version;
30 
31  if (AV_RB32(p->buf) != MKBETAG('M','U','S','X'))
32  return 0;
33 
34  version = AV_RL32(p->buf + 8);
35  if (version != 10 &&
36  version != 6 &&
37  version != 5 &&
38  version != 4 &&
39  version != 201)
40  return 0;
41 
42  return AVPROBE_SCORE_MAX / 5 * 2;
43 }
44 
46 {
47  unsigned type, version, coding, offset;
48  AVStream *st;
49 
50  avio_skip(s->pb, 8);
51  version = avio_rl32(s->pb);
52  if (version != 10 &&
53  version != 6 &&
54  version != 5 &&
55  version != 4 &&
56  version != 201) {
57  avpriv_request_sample(s, "Unsupported version: %d", version);
58  return AVERROR_PATCHWELCOME;
59  }
60  avio_skip(s->pb, 4);
61 
62  st = avformat_new_stream(s, NULL);
63  if (!st)
64  return AVERROR(ENOMEM);
65 
66  if (version == 201) {
67  avio_skip(s->pb, 8);
68  offset = avio_rl32(s->pb);
71  st->codecpar->channels = 2;
72  st->codecpar->sample_rate = 32000;
73  st->codecpar->block_align = 0x80 * st->codecpar->channels;
74  } else if (version == 10) {
75  type = avio_rl32(s->pb);
77  offset = 0x800;
78  switch (type) {
79  case MKTAG('P', 'S', '3', '_'):
80  st->codecpar->channels = 2;
81  st->codecpar->sample_rate = 44100;
82  avio_skip(s->pb, 44);
83  coding = avio_rl32(s->pb);
84  if (coding == MKTAG('D', 'A', 'T', '4') ||
85  coding == MKTAG('D', 'A', 'T', '8')) {
86  avio_skip(s->pb, 4);
87  st->codecpar->channels = avio_rl32(s->pb);
88  if (st->codecpar->channels <= 0 ||
89  st->codecpar->channels > INT_MAX / 0x20)
90  return AVERROR_INVALIDDATA;
91  st->codecpar->sample_rate = avio_rl32(s->pb);
92  }
94  st->codecpar->block_align = 0x20 * st->codecpar->channels;
95  break;
96  case MKTAG('W', 'I', 'I', '_'):
97  avio_skip(s->pb, 44);
98  coding = avio_rl32(s->pb);
99  if (coding != MKTAG('D', 'A', 'T', '4') &&
100  coding != MKTAG('D', 'A', 'T', '8')) {
101  avpriv_request_sample(s, "Unsupported coding: %X", coding);
102  return AVERROR_PATCHWELCOME;
103  }
104  avio_skip(s->pb, 4);
106  st->codecpar->channels = avio_rl32(s->pb);
107  if (st->codecpar->channels <= 0 ||
108  st->codecpar->channels > INT_MAX / 0x20)
109  return AVERROR_INVALIDDATA;
110  st->codecpar->sample_rate = avio_rl32(s->pb);
111  st->codecpar->block_align = 0x20 * st->codecpar->channels;
112  break;
113  case MKTAG('X', 'E', '_', '_'):
115  st->codecpar->channels = 2;
116  st->codecpar->sample_rate = 32000;
117  st->codecpar->block_align = 0x20 * st->codecpar->channels;
118  break;
119  case MKTAG('P', 'S', 'P', '_'):
121  st->codecpar->channels = 2;
122  st->codecpar->sample_rate = 32768;
123  st->codecpar->block_align = 0x80 * st->codecpar->channels;
124  break;
125  case MKTAG('P', 'S', '2', '_'):
127  st->codecpar->channels = 2;
128  st->codecpar->sample_rate = 32000;
129  st->codecpar->block_align = 0x80 * st->codecpar->channels;
130  break;
131  default:
132  avpriv_request_sample(s, "Unsupported type: %X", type);
133  return AVERROR_PATCHWELCOME;
134  }
135  } else if (version == 6 || version == 5 || version == 4) {
136  type = avio_rl32(s->pb);
137  avio_skip(s->pb, 20);
139  st->codecpar->channels = 2;
140  switch (type) {
141  case MKTAG('G', 'C', '_', '_'):
143  st->codecpar->block_align = 0x20 * st->codecpar->channels;
144  st->codecpar->sample_rate = 32000;
145  offset = avio_rb32(s->pb);
146  break;
147  case MKTAG('P', 'S', '2', '_'):
149  st->codecpar->block_align = 0x80 * st->codecpar->channels;
150  st->codecpar->sample_rate = 32000;
151  offset = avio_rl32(s->pb);
152  break;
153  case MKTAG('X', 'B', '_', '_'):
155  st->codecpar->block_align = 0x20 * st->codecpar->channels;
156  st->codecpar->sample_rate = 44100;
157  offset = avio_rl32(s->pb);
158  break;
159  default:
160  avpriv_request_sample(s, "Unsupported type: %X", type);
161  return AVERROR_PATCHWELCOME;
162  }
163  } else {
164  av_assert0(0);
165  }
166 
167  avio_seek(s->pb, offset, SEEK_SET);
168 
169  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
170 
171  return 0;
172 }
173 
175 {
176  AVCodecParameters *par = s->streams[0]->codecpar;
177 
178  return av_get_packet(s->pb, pkt, par->block_align);
179 }
180 
182  .name = "musx",
183  .long_name = NULL_IF_CONFIG_SMALL("Eurocom MUSX"),
184  .read_probe = musx_probe,
185  .read_header = musx_read_header,
186  .read_packet = musx_read_packet,
187  .extensions = "musx",
188 };
simple assert() macros that are a bit more flexible than ISO C assert().
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
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:310
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RL32
Definition: intreadwrite.h:146
#define s(width, name)
Definition: cbs_vp9.c:257
#define MKTAG(a, b, c, d)
Definition: common.h:478
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define NULL
Definition: coverity.c:32
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:391
@ AV_CODEC_ID_ADPCM_IMA_DAT4
Definition: codec_id.h:393
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR(e)
Definition: error.h:43
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
cl_device_type type
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:4941
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
version
Definition: libkvazaar.c:320
static int musx_probe(const AVProbeData *p)
Definition: musx.c:27
static int musx_read_header(AVFormatContext *s)
Definition: musx.c:45
static int musx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: musx.c:174
AVInputFormat ff_musx_demuxer
Definition: musx.c:181
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
int channels
Audio only.
Definition: codec_par.h:166
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
int block_align
Audio only.
Definition: codec_par.h:177
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
#define avpriv_request_sample(...)
AVPacket * pkt
Definition: movenc.c:59
static const uint8_t offset[127][2]
Definition: vf_spp.c:107