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/intreadwrite.h"

34 #include "avformat.h"

35 #include "internal.h"

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

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

40 #define RAW_CD_SECTOR_SIZE 2352

41 #define RAW_CD_SECTOR_DATA_SIZE 2304

42 #define VIDEO_DATA_CHUNK_SIZE 0x7E0

43 #define VIDEO_DATA_HEADER_SIZE 0x38

44 #define RIFF_HEADER_SIZE 0x2C

46 #define CDXA_TYPE_MASK 0x0E

47 #define CDXA_TYPE_DATA 0x08

48 #define CDXA_TYPE_AUDIO 0x04

49 #define CDXA_TYPE_VIDEO 0x02

51 #define STR_MAGIC (0x80010160)

53 typedef struct StrChannel {

54 /* video parameters */

55 int video_stream_index;

56 AVPacket tmp_pkt;

58 /* audio parameters */

59 int audio_stream_index;

60 } StrChannel;

62 typedef struct StrDemuxContext {

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

65 StrChannel channels[32];

66 } StrDemuxContext;

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

70 static int str_probe(AVProbeData *p)

71 {

72 const uint8_t *sector= p->buf;

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

74 int aud=0, vid=0;

76 if (p->buf_size < RAW_CD_SECTOR_SIZE)

77 return 0;

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

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

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

83 sector += RIFF_HEADER_SIZE;

84 }

86 while (end - sector >= RAW_CD_SECTOR_SIZE) {

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

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

89 return 0;

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

92 return 0;

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

95 case CDXA_TYPE_DATA:

96 case CDXA_TYPE_VIDEO: {

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

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

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

100

101 if(!( frame_size>=0

102 && current_sector < sector_count

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

104 return 0;

105 }

106

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

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

109

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

111 vid++;

112 // }

113

114 }

115 break;

116 case CDXA_TYPE_AUDIO:

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

118 return 0;

119 aud++;

120 break;

121 default:

122 if(sector[0x12] & CDXA_TYPE_MASK)

123 return 0;

124 }

125 sector += RAW_CD_SECTOR_SIZE;

126 }

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

128 * only return half certainty */

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

130 else if(vid+aud) return 1;

131 else return 0;

132 }

133

134 static int str_read_header(AVFormatContext *s)

135 {

136 AVIOContext *pb = s->pb;

137 StrDemuxContext *str = s->priv_data;

138 unsigned char sector[RAW_CD_SECTOR_SIZE];

139 int start;

140 int i;

141

142 /* skip over any RIFF header */

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

144 return AVERROR(EIO);

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

146 start = RIFF_HEADER_SIZE;

147 else

148 start = 0;

149

150 avio_seek(pb, start, SEEK_SET);

151

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

153 str->channels[i].video_stream_index=

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

155 }

156

157 s->ctx_flags |= AVFMTCTX_NOHEADER;

158

159 return 0;

160 }

161

162 static int str_read_packet(AVFormatContext *s,

163 AVPacket *ret_pkt)

164 {

165 AVIOContext *pb = s->pb;

166 StrDemuxContext *str = s->priv_data;

167 unsigned char sector[RAW_CD_SECTOR_SIZE];

168 int channel;

169 AVPacket *pkt;

170 AVStream *st;

171

172 while (1) {

173

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

175 return AVERROR(EIO);

176

177 channel = sector[0x11];

178 if (channel >= 32)

179 return AVERROR_INVALIDDATA;

180

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

182

183 case CDXA_TYPE_DATA:

184 case CDXA_TYPE_VIDEO:

185 {

186

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

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

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

190

191 if(!( frame_size>=0

192 && current_sector < sector_count

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

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

195 break;

196 }

197

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

199 /* allocate a new AVStream */

200 st = avformat_new_stream(s, NULL);

201 if (!st)

202 return AVERROR(ENOMEM);

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

204

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

206

207 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

208 st->codec->codec_id = AV_CODEC_ID_MDEC;

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

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

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

212 }

213

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

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

216

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

218 if(pkt->data)

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

220 av_free_packet(pkt);

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

222 return AVERROR(EIO);

223

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

225 pkt->stream_index =

226 str->channels[channel].video_stream_index;

227 }

228

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

230 sector + VIDEO_DATA_HEADER_SIZE,

231 VIDEO_DATA_CHUNK_SIZE);

232

233 if (current_sector == sector_count-1) {

234 pkt->size= frame_size;

235 *ret_pkt = *pkt;

236 pkt->data= NULL;

237 pkt->size= -1;

238 pkt->buf = NULL;

239 #if FF_API_DESTRUCT_PACKET

240 pkt->destruct = NULL;

241 #endif

242 return 0;

243 }

244

245 }

246 break;

247

248 case CDXA_TYPE_AUDIO:

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

250 int fmt = sector[0x13];

251 /* allocate a new AVStream */

252 st = avformat_new_stream(s, NULL);

253 if (!st)

254 return AVERROR(ENOMEM);

255

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

257

258 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

259 st->codec->codec_id = AV_CODEC_ID_ADPCM_XA;

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

261 if (fmt & 1) {

262 st->codec->channels = 2;

263 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;

264 } else {

265 st->codec->channels = 1;

266 st->codec->channel_layout = AV_CH_LAYOUT_MONO;

267 }

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

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

270 st->codec->block_align = 128;

271

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

273 st->codec->sample_rate);

274 st->start_time = 0;

275 }

276 pkt = ret_pkt;

277 if (av_new_packet(pkt, 2304))

278 return AVERROR(EIO);

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

280

281 pkt->stream_index =

282 str->channels[channel].audio_stream_index;

283 pkt->duration = 1;

284 return 0;

285 default:

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

287 /* drop the sector and move on */

288 break;

289 }

290

291 if (url_feof(pb))

292 return AVERROR(EIO);

293 }

294 }

295

296 static int str_read_close(AVFormatContext *s)

297 {

298 StrDemuxContext *str = s->priv_data;

299 int i;

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

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

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

303 }

304

305 return 0;

306 }

307

308 AVInputFormat ff_str_demuxer = {

309 .name = "psxstr",

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

311 .priv_data_size = sizeof(StrDemuxContext),

312 .read_probe = str_probe,

313 .read_header = str_read_header,

314 .read_packet = str_read_packet,

315 .read_close = str_read_close,

316 .flags = AVFMT_NO_BYTE_SEEK,

317 };

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