FFmpeg: libavformat/musx.c Source File

FFmpeg
musx.c
Go to the documentation of this file.
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 
45  static int musx_read_header(AVFormatContext *s)
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);
69  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
70  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
71  st->codecpar->ch_layout.nb_channels = 2;
72  st->codecpar->sample_rate = 32000;
73  st->codecpar->block_align = 0x80 * st->codecpar->ch_layout.nb_channels;
74  } else if (version == 10) {
75  type = avio_rl32(s->pb);
76  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
77  offset = 0x800;
78  switch (type) {
79  case MKTAG('P', 'S', '3', '_'):
80  st->codecpar->ch_layout.nb_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->ch_layout.nb_channels = avio_rl32(s->pb);
88  if (st->codecpar->ch_layout.nb_channels <= 0 ||
89  st->codecpar->ch_layout.nb_channels > INT_MAX / 0x20)
90  return AVERROR_INVALIDDATA;
91  st->codecpar->sample_rate = avio_rl32(s->pb);
92  }
93  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
94  st->codecpar->block_align = 0x20 * st->codecpar->ch_layout.nb_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);
105  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
106  st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb);
107  if (st->codecpar->ch_layout.nb_channels <= 0 ||
108  st->codecpar->ch_layout.nb_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->ch_layout.nb_channels;
112  break;
113  case MKTAG('X', 'E', '_', '_'):
114  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
115  st->codecpar->ch_layout.nb_channels = 2;
116  st->codecpar->sample_rate = 32000;
117  st->codecpar->block_align = 0x20 * st->codecpar->ch_layout.nb_channels;
118  break;
119  case MKTAG('P', 'S', 'P', '_'):
120  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
121  st->codecpar->ch_layout.nb_channels = 2;
122  st->codecpar->sample_rate = 32768;
123  st->codecpar->block_align = 0x80 * st->codecpar->ch_layout.nb_channels;
124  break;
125  case MKTAG('P', 'S', '2', '_'):
126  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
127  st->codecpar->ch_layout.nb_channels = 2;
128  st->codecpar->sample_rate = 32000;
129  st->codecpar->block_align = 0x80 * st->codecpar->ch_layout.nb_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);
138  st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
139  st->codecpar->ch_layout.nb_channels = 2;
140  switch (type) {
141  case MKTAG('G', 'C', '_', '_'):
142  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
143  st->codecpar->block_align = 0x20 * st->codecpar->ch_layout.nb_channels;
144  st->codecpar->sample_rate = 32000;
145  offset = avio_rb32(s->pb);
146  break;
147  case MKTAG('P', 'S', '2', '_'):
148  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
149  st->codecpar->block_align = 0x80 * st->codecpar->ch_layout.nb_channels;
150  st->codecpar->sample_rate = 32000;
151  offset = avio_rl32(s->pb);
152  break;
153  case MKTAG('X', 'B', '_', '_'):
154  st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
155  st->codecpar->block_align = 0x20 * st->codecpar->ch_layout.nb_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 
174  static int musx_read_packet(AVFormatContext *s, AVPacket *pkt)
175 {
176  AVCodecParameters *par = s->streams[0]->codecpar;
177 
178  return av_get_packet(s->pb, pkt, par->block_align);
179 }
180 
181  const AVInputFormat ff_musx_demuxer = {
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 };
AVERROR
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: options.c:243
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:58
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:54
musx_read_packet
static int musx_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: musx.c:174
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:311
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:771
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
ff_musx_demuxer
const AVInputFormat ff_musx_demuxer
Definition: musx.c:181
avassert.h
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:782
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:546
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:551
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
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
AVFormatContext
Format I/O context.
Definition: avformat.h:1104
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:861
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
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:213
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:178
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:751
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:115
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
musx_probe
static int musx_probe(const AVProbeData *p)
Definition: musx.c:27
AV_RB32
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:96
offset
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
Definition: writing_filters.txt:86
version
version
Definition: libkvazaar.c:313
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:185
musx_read_header
static int musx_read_header(AVFormatContext *s)
Definition: musx.c:45
AV_CODEC_ID_ADPCM_IMA_DAT4
@ AV_CODEC_ID_ADPCM_IMA_DAT4
Definition: codec_id.h:404
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:102
AVStream
Stream structure.
Definition: avformat.h:838
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:252
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:339
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:62
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AV_CODEC_ID_ADPCM_PSX
@ AV_CODEC_ID_ADPCM_PSX
Definition: codec_id.h:402
Generated on Tue Feb 28 2023 21:34:07 for FFmpeg by   doxygen 1.8.17

AltStyle によって変換されたページ (->オリジナル) /