FFmpeg: libavformat/psxstr.c Source File

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libavformat

psxstr.c

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1 /*

2 * Sony Playstation (PSX) STR File Demuxer

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 */

22 /**

23 * @file

24 * PSX STR file demuxer

25 * by Mike Melanson (melanson@pcisys.net)

26 * This module handles streams that have been ripped from Sony Playstation

27 * CD games. This demuxer can handle either raw STR files (which are just

28 * concatenations of raw compact disc sectors) or STR files with 0x2C-byte

29 * RIFF headers, followed by CD sectors.

30 */

32 #include "libavutil/channel_layout.h"

33 #include "libavutil/internal.h"

34 #include "libavutil/intreadwrite.h"

35 #include "avformat.h"

36 #include "internal.h"

38 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')

39 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')

41 #define RAW_CD_SECTOR_SIZE 2352

42 #define RAW_CD_SECTOR_DATA_SIZE 2304

43 #define VIDEO_DATA_CHUNK_SIZE 0x7E0

44 #define VIDEO_DATA_HEADER_SIZE 0x38

45 #define RIFF_HEADER_SIZE 0x2C

47 #define CDXA_TYPE_MASK 0x0E

48 #define CDXA_TYPE_DATA 0x08

49 #define CDXA_TYPE_AUDIO 0x04

50 #define CDXA_TYPE_VIDEO 0x02

52 #define STR_MAGIC (0x80010160)

54 typedef struct StrChannel {

55 /* video parameters */

56 int video_stream_index;

57 AVPacket tmp_pkt;

59 /* audio parameters */

60 int audio_stream_index;

61 } StrChannel;

63 typedef struct StrDemuxContext {

65 /* a STR file can contain up to 32 channels of data */

66 StrChannel channels[32];

67 } StrDemuxContext;

69 static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};

71 static int str_probe(AVProbeData *p)

72 {

73 const uint8_t *sector= p->buf;

74 const uint8_t *end= sector + p->buf_size;

75 int aud=0, vid=0;

77 if (p->buf_size < RAW_CD_SECTOR_SIZE)

78 return 0;

80 if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&

81 (AV_RL32(&p->buf[8]) == CDXA_TAG)) {

83 /* RIFF header seen; skip 0x2C bytes */

84 sector += RIFF_HEADER_SIZE;

85 }

87 while (end - sector >= RAW_CD_SECTOR_SIZE) {

88 /* look for CD sync header (00, 0xFF x 10, 00) */

89 if (memcmp(sector,sync_header,sizeof(sync_header)))

90 return 0;

92 if (sector[0x11] >= 32)

93 return 0;

95 switch (sector[0x12] & CDXA_TYPE_MASK) {

96 case CDXA_TYPE_DATA:

97 case CDXA_TYPE_VIDEO: {

98 int current_sector = AV_RL16(&sector[0x1C]);

99 int sector_count = AV_RL16(&sector[0x1E]);

100 int frame_size = AV_RL32(&sector[0x24]);

101

102 if(!( frame_size>=0

103 && current_sector < sector_count

104 && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){

105 return 0;

106 }

107

108 /*st->codec->width = AV_RL16(&sector[0x28]);

109 st->codec->height = AV_RL16(&sector[0x2A]);*/

110

111 // if (current_sector == sector_count-1) {

112 vid++;

113 // }

114

115 }

116 break;

117 case CDXA_TYPE_AUDIO:

118 if(sector[0x13]&0x2A)

119 return 0;

120 aud++;

121 break;

122 default:

123 if(sector[0x12] & CDXA_TYPE_MASK)

124 return 0;

125 }

126 sector += RAW_CD_SECTOR_SIZE;

127 }

128 /* MPEG files (like those ripped from VCDs) can also look like this;

129 * only return half certainty */

130 if(vid+aud > 3) return AVPROBE_SCORE_EXTENSION;

131 else if(vid+aud) return 1;

132 else return 0;

133 }

134

135 static int str_read_header(AVFormatContext *s)

136 {

137 AVIOContext *pb = s->pb;

138 StrDemuxContext *str = s->priv_data;

139 unsigned char sector[RAW_CD_SECTOR_SIZE];

140 int start;

141 int i;

142

143 /* skip over any RIFF header */

144 if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)

145 return AVERROR(EIO);

146 if (AV_RL32(&sector[0]) == RIFF_TAG)

147 start = RIFF_HEADER_SIZE;

148 else

149 start = 0;

150

151 avio_seek(pb, start, SEEK_SET);

152

153 for(i=0; i<32; i++){

154 str->channels[i].video_stream_index=

155 str->channels[i].audio_stream_index= -1;

156 }

157

158 s->ctx_flags |= AVFMTCTX_NOHEADER;

159

160 return 0;

161 }

162

163 static int str_read_packet(AVFormatContext *s,

164 AVPacket *ret_pkt)

165 {

166 AVIOContext *pb = s->pb;

167 StrDemuxContext *str = s->priv_data;

168 unsigned char sector[RAW_CD_SECTOR_SIZE];

169 int channel;

170 AVPacket *pkt;

171 AVStream *st;

172

173 while (1) {

174

175 if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)

176 return AVERROR(EIO);

177

178 channel = sector[0x11];

179 if (channel >= 32)

180 return AVERROR_INVALIDDATA;

181

182 switch (sector[0x12] & CDXA_TYPE_MASK) {

183

184 case CDXA_TYPE_DATA:

185 case CDXA_TYPE_VIDEO:

186 {

187

188 int current_sector = AV_RL16(&sector[0x1C]);

189 int sector_count = AV_RL16(&sector[0x1E]);

190 int frame_size = AV_RL32(&sector[0x24]);

191

192 if(!( frame_size>=0

193 && current_sector < sector_count

194 && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){

195 av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);

196 break;

197 }

198

199 if(str->channels[channel].video_stream_index < 0){

200 /* allocate a new AVStream */

201 st = avformat_new_stream(s, NULL);

202 if (!st)

203 return AVERROR(ENOMEM);

204 avpriv_set_pts_info(st, 64, 1, 15);

205

206 str->channels[channel].video_stream_index = st->index;

207

208 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

209 st->codec->codec_id = AV_CODEC_ID_MDEC;

210 st->codec->codec_tag = 0; /* no fourcc */

211 st->codec->width = AV_RL16(&sector[0x28]);

212 st->codec->height = AV_RL16(&sector[0x2A]);

213 }

214

215 /* if this is the first sector of the frame, allocate a pkt */

216 pkt = &str->channels[channel].tmp_pkt;

217

218 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){

219 if(pkt->data)

220 av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");

221 av_free_packet(pkt);

222 if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))

223 return AVERROR(EIO);

224

225 pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;

226 pkt->stream_index =

227 str->channels[channel].video_stream_index;

228 }

229

230 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,

231 sector + VIDEO_DATA_HEADER_SIZE,

232 VIDEO_DATA_CHUNK_SIZE);

233

234 if (current_sector == sector_count-1) {

235 pkt->size= frame_size;

236 *ret_pkt = *pkt;

237 pkt->data= NULL;

238 pkt->size= -1;

239 pkt->buf = NULL;

240 #if FF_API_DESTRUCT_PACKET

241 FF_DISABLE_DEPRECATION_WARNINGS

242 pkt->destruct = NULL;

243 FF_ENABLE_DEPRECATION_WARNINGS

244 #endif

245 return 0;

246 }

247

248 }

249 break;

250

251 case CDXA_TYPE_AUDIO:

252 if(str->channels[channel].audio_stream_index < 0){

253 int fmt = sector[0x13];

254 /* allocate a new AVStream */

255 st = avformat_new_stream(s, NULL);

256 if (!st)

257 return AVERROR(ENOMEM);

258

259 str->channels[channel].audio_stream_index = st->index;

260

261 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

262 st->codec->codec_id = AV_CODEC_ID_ADPCM_XA;

263 st->codec->codec_tag = 0; /* no fourcc */

264 if (fmt & 1) {

265 st->codec->channels = 2;

266 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

267 } else {

268 st->codec->channels = 1;

269 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

270 }

271 st->codec->sample_rate = (fmt&4)?18900:37800;

272 // st->codec->bit_rate = 0; //FIXME;

273 st->codec->block_align = 128;

274

275 avpriv_set_pts_info(st, 64, 18 * 224 / st->codec->channels,

276 st->codec->sample_rate);

277 st->start_time = 0;

278 }

279 pkt = ret_pkt;

280 if (av_new_packet(pkt, 2304))

281 return AVERROR(EIO);

282 memcpy(pkt->data,sector+24,2304);

283

284 pkt->stream_index =

285 str->channels[channel].audio_stream_index;

286 pkt->duration = 1;

287 return 0;

288 default:

289 av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);

290 /* drop the sector and move on */

291 break;

292 }

293

294 if (url_feof(pb))

295 return AVERROR(EIO);

296 }

297 }

298

299 static int str_read_close(AVFormatContext *s)

300 {

301 StrDemuxContext *str = s->priv_data;

302 int i;

303 for(i=0; i<32; i++){

304 if(str->channels[i].tmp_pkt.data)

305 av_free_packet(&str->channels[i].tmp_pkt);

306 }

307

308 return 0;

309 }

310

311 AVInputFormat ff_str_demuxer = {

312 .name = "psxstr",

313 .long_name = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),

314 .priv_data_size = sizeof(StrDemuxContext),

315 .read_probe = str_probe,

316 .read_header = str_read_header,

317 .read_packet = str_read_packet,

318 .read_close = str_read_close,

319 .flags = AVFMT_NO_BYTE_SEEK,

320 };

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