FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rsd.c
Go to the documentation of this file.
1 /*
2  * RSD demuxer
3  * Copyright (c) 2013 James Almer
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 "libavcodec/bytestream.h"
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "avio.h"
26 #include "internal.h"
27 
28 static const AVCodecTag rsd_tags[] = {
29  { AV_CODEC_ID_ADPCM_THP, MKTAG('G','A','D','P') },
30  { AV_CODEC_ID_ADPCM_IMA_RAD, MKTAG('R','A','D','P') },
31  { AV_CODEC_ID_PCM_S16BE, MKTAG('P','C','M','B') },
32  { AV_CODEC_ID_PCM_S16LE, MKTAG('P','C','M',' ') },
33  { AV_CODEC_ID_NONE, 0 },
34 };
35 
36 static const uint32_t rsd_unsupported_tags[] = {
37  MKTAG('O','G','G',' '),
38  MKTAG('V','A','G',' '),
39  MKTAG('W','A','D','P'),
40  MKTAG('X','A','D','P'),
41  MKTAG('X','M','A',' '),
42 };
43 
44 static int rsd_probe(AVProbeData *p)
45 {
46  if (!memcmp(p->buf, "RSD", 3) &&
47  p->buf[3] - '0' >= 2 && p->buf[3] - '0' <= 6)
49  return 0;
50 }
51 
53 {
54  AVIOContext *pb = s->pb;
55  int i, version, start = 0x800;
56  AVCodecContext *codec;
57  AVStream *st = avformat_new_stream(s, NULL);
58 
59  if (!st)
60  return AVERROR(ENOMEM);
61 
62  avio_skip(pb, 3); // "RSD"
63  version = avio_r8(pb) - '0';
64 
65  codec = st->codec;
67  codec->codec_tag = avio_rl32(pb);
68  codec->codec_id = ff_codec_get_id(rsd_tags, codec->codec_tag);
69  if (!codec->codec_id) {
70  char tag_buf[5];
71 
72  av_get_codec_tag_string(tag_buf, sizeof(tag_buf), codec->codec_tag);
73  for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) {
74  if (codec->codec_tag == rsd_unsupported_tags[i]) {
75  avpriv_request_sample(s, "Codec tag: %s", tag_buf);
76  return AVERROR_PATCHWELCOME;
77  }
78  }
79  av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf);
80  return AVERROR_INVALIDDATA;
81  }
82 
83  codec->channels = avio_rl32(pb);
84  if (!codec->channels)
85  return AVERROR_INVALIDDATA;
86 
87  avio_skip(pb, 4); // Bit depth
88  codec->sample_rate = avio_rl32(pb);
89  if (!codec->sample_rate)
90  return AVERROR_INVALIDDATA;
91 
92  avio_skip(pb, 4); // Unknown
93 
94  switch (codec->codec_id) {
96  codec->block_align = 20 * codec->channels;
97  if (pb->seekable)
98  st->duration = av_get_audio_frame_duration(codec, avio_size(pb) - start);
99  break;
101  /* RSD3GADP is mono, so only alloc enough memory
102  to store the coeff table for a single channel. */
103 
104  codec->extradata_size = 32;
105  codec->extradata = av_malloc(codec->extradata_size);
106  if (!codec->extradata)
107  return AVERROR(ENOMEM);
108 
109  start = avio_rl32(pb);
110 
111  if (avio_read(s->pb, codec->extradata, 32) != 32)
112  return AVERROR_INVALIDDATA;
113 
114  for (i = 0; i < 16; i++)
115  AV_WB16(codec->extradata + i * 2, AV_RL16(codec->extradata + i * 2));
116 
117  if (pb->seekable)
118  st->duration = (avio_size(pb) - start) / 8 * 14;
119  break;
122  if (version != 4)
123  start = avio_rl32(pb);
124 
125  if (pb->seekable)
126  st->duration = (avio_size(pb) - start) / 2 / codec->channels;
127  break;
128  }
129 
130  avio_skip(pb, start - avio_tell(pb));
131 
132  avpriv_set_pts_info(st, 64, 1, codec->sample_rate);
133 
134  return 0;
135 }
136 
138 {
139  AVCodecContext *codec = s->streams[0]->codec;
140  int ret, size = 1024;
141 
142  if (url_feof(s->pb))
143  return AVERROR_EOF;
144 
145  if (codec->codec_id == AV_CODEC_ID_ADPCM_IMA_RAD)
146  ret = av_get_packet(s->pb, pkt, codec->block_align);
147  else
148  ret = av_get_packet(s->pb, pkt, size);
149 
150  if (ret != size) {
151  if (ret < 0) {
152  av_free_packet(pkt);
153  return ret;
154  }
155  av_shrink_packet(pkt, ret);
156  }
157  pkt->stream_index = 0;
158 
159  return ret;
160 }
161 
163  .name = "rsd",
164  .long_name = NULL_IF_CONFIG_SMALL("GameCube RSD"),
165  .read_probe = rsd_probe,
166  .read_header = rsd_read_header,
167  .read_packet = rsd_read_packet,
168  .extensions = "rsd",
169  .codec_tag = (const AVCodecTag* const []){rsd_tags, 0},
170 };