FFmpeg
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 };
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
version
Definition: libkvazaar.c:317
AVInputFormat ff_musx_demuxer
Definition: musx.c:181
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:4869
#define avpriv_request_sample(...)
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
GLint GLenum type
Definition: opengl_enc.c:104
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:341
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
Format I/O context.
Definition: avformat.h:1351
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
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 offset
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4450
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
static int musx_probe(const AVProbeData *p)
Definition: musx.c:27
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:305
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
simple assert() macros that are a bit more flexible than ISO C assert().
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int block_align
Audio only.
Definition: codec_par.h:177
#define s(width, name)
Definition: cbs_vp9.c:257
static int musx_read_header(AVFormatContext *s)
Definition: musx.c:45
Stream structure.
Definition: avformat.h:876
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
Main libavformat public API header.
#define MKBETAG(a, b, c, d)
Definition: common.h:407
static int musx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: musx.c:174
int channels
Audio only.
Definition: codec_par.h:166
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
#define MKTAG(a, b, c, d)
Definition: common.h:406
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: packet.h:340