psxstr.c
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1 /*
2  * Sony Playstation (PSX) STR File Demuxer
3  * Copyright (c) 2003 The ffmpeg Project
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
32 #include "libavutil/intreadwrite.h"
33 #include "avformat.h"
34 #include "internal.h"
35 
36 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
37 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
38 
39 #define RAW_CD_SECTOR_SIZE 2352
40 #define RAW_CD_SECTOR_DATA_SIZE 2304
41 #define VIDEO_DATA_CHUNK_SIZE 0x7E0
42 #define VIDEO_DATA_HEADER_SIZE 0x38
43 #define RIFF_HEADER_SIZE 0x2C
44 
45 #define CDXA_TYPE_MASK 0x0E
46 #define CDXA_TYPE_DATA 0x08
47 #define CDXA_TYPE_AUDIO 0x04
48 #define CDXA_TYPE_VIDEO 0x02
49 
50 #define STR_MAGIC (0x80010160)
51 
52 typedef struct StrChannel {
53  /* video parameters */
56 
57  /* audio parameters */
59 } StrChannel;
60 
61 typedef struct StrDemuxContext {
62 
63  /* a STR file can contain up to 32 channels of data */
66 
67 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
68 
69 static int str_probe(AVProbeData *p)
70 {
71  uint8_t *sector= p->buf;
72 
74  return 0;
75 
76  if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
77  (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
78 
79  /* RIFF header seen; skip 0x2C bytes */
80  sector += RIFF_HEADER_SIZE;
81  }
82 
83  /* look for CD sync header (00, 0xFF x 10, 00) */
84  if (memcmp(sector,sync_header,sizeof(sync_header)))
85  return 0;
86 
87  if(sector[0x11] >= 32)
88  return 0;
89  if( (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
90  && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
91  && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
92  return 0;
93 
94  /* MPEG files (like those ripped from VCDs) can also look like this;
95  * only return half certainty */
96  return 50;
97 }
98 
100  AVFormatParameters *ap)
101 {
102  AVIOContext *pb = s->pb;
103  StrDemuxContext *str = s->priv_data;
104  unsigned char sector[RAW_CD_SECTOR_SIZE];
105  int start;
106  int i;
107 
108  /* skip over any RIFF header */
109  if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
110  return AVERROR(EIO);
111  if (AV_RL32(&sector[0]) == RIFF_TAG)
112  start = RIFF_HEADER_SIZE;
113  else
114  start = 0;
115 
116  avio_seek(pb, start, SEEK_SET);
117 
118  for(i=0; i<32; i++){
120  str->channels[i].audio_stream_index= -1;
121  }
122 
124 
125  return 0;
126 }
127 
129  AVPacket *ret_pkt)
130 {
131  AVIOContext *pb = s->pb;
132  StrDemuxContext *str = s->priv_data;
133  unsigned char sector[RAW_CD_SECTOR_SIZE];
134  int channel;
135  AVPacket *pkt;
136  AVStream *st;
137 
138  while (1) {
139 
140  if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
141  return AVERROR(EIO);
142 
143  channel = sector[0x11];
144  if (channel >= 32)
145  return AVERROR_INVALIDDATA;
146 
147  switch (sector[0x12] & CDXA_TYPE_MASK) {
148 
149  case CDXA_TYPE_DATA:
150  case CDXA_TYPE_VIDEO:
151  {
152 
153  int current_sector = AV_RL16(&sector[0x1C]);
154  int sector_count = AV_RL16(&sector[0x1E]);
155  int frame_size = AV_RL32(&sector[0x24]);
156 
157  if(!( frame_size>=0
158  && current_sector < sector_count
159  && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
160  av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
161  break;
162  }
163 
164  if(str->channels[channel].video_stream_index < 0){
165  /* allocate a new AVStream */
166  st = avformat_new_stream(s, NULL);
167  if (!st)
168  return AVERROR(ENOMEM);
169  avpriv_set_pts_info(st, 64, 1, 15);
170 
171  str->channels[channel].video_stream_index = st->index;
172 
175  st->codec->codec_tag = 0; /* no fourcc */
176  st->codec->width = AV_RL16(&sector[0x28]);
177  st->codec->height = AV_RL16(&sector[0x2A]);
178  }
179 
180  /* if this is the first sector of the frame, allocate a pkt */
181  pkt = &str->channels[channel].tmp_pkt;
182 
183  if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
184  if(pkt->data)
185  av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
186  av_free_packet(pkt);
187  if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
188  return AVERROR(EIO);
189 
190  pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
191  pkt->stream_index =
192  str->channels[channel].video_stream_index;
193  }
194 
195  memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
196  sector + VIDEO_DATA_HEADER_SIZE,
197  VIDEO_DATA_CHUNK_SIZE);
198 
199  if (current_sector == sector_count-1) {
200  pkt->size= frame_size;
201  *ret_pkt = *pkt;
202  pkt->data= NULL;
203  pkt->size= -1;
204  return 0;
205  }
206 
207  }
208  break;
209 
210  case CDXA_TYPE_AUDIO:
211  if(str->channels[channel].audio_stream_index < 0){
212  int fmt = sector[0x13];
213  /* allocate a new AVStream */
214  st = avformat_new_stream(s, NULL);
215  if (!st)
216  return AVERROR(ENOMEM);
217 
218  str->channels[channel].audio_stream_index = st->index;
219 
222  st->codec->codec_tag = 0; /* no fourcc */
223  st->codec->channels = (fmt&1)?2:1;
224  st->codec->sample_rate = (fmt&4)?18900:37800;
225  // st->codec->bit_rate = 0; //FIXME;
226  st->codec->block_align = 128;
227 
228  avpriv_set_pts_info(st, 64, 128, st->codec->sample_rate);
229  }
230  pkt = ret_pkt;
231  if (av_new_packet(pkt, 2304))
232  return AVERROR(EIO);
233  memcpy(pkt->data,sector+24,2304);
234 
235  pkt->stream_index =
236  str->channels[channel].audio_stream_index;
237  return 0;
238  default:
239  av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
240  /* drop the sector and move on */
241  break;
242  }
243 
244  if (pb->eof_reached)
245  return AVERROR(EIO);
246  }
247 }
248 
250 {
251  StrDemuxContext *str = s->priv_data;
252  int i;
253  for(i=0; i<32; i++){
254  if(str->channels[i].tmp_pkt.data)
255  av_free_packet(&str->channels[i].tmp_pkt);
256  }
257 
258  return 0;
259 }
260 
262  .name = "psxstr",
263  .long_name = NULL_IF_CONFIG_SMALL("Sony Playstation STR format"),
264  .priv_data_size = sizeof(StrDemuxContext),
269 };