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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 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 /**
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  */
31 
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/intreadwrite.h"
35 #include "avformat.h"
36 #include "internal.h"
37 
38 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
39 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
40 
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
46 
47 #define CDXA_TYPE_MASK     0x0E
48 #define CDXA_TYPE_DATA     0x08
49 #define CDXA_TYPE_AUDIO    0x04
50 #define CDXA_TYPE_VIDEO    0x02
51 
52 #define STR_MAGIC (0x80010160)
53 
54 typedef struct StrChannel {
55     /* video parameters */
56     int video_stream_index;
57     AVPacket tmp_pkt;
58 
59     /* audio parameters */
60     int audio_stream_index;
61 } StrChannel;
62 
63 typedef struct StrDemuxContext {
64 
65     /* a STR file can contain up to 32 channels of data */
66     StrChannel channels[32];
67 } StrDemuxContext;
68 
69 static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
70 
str_probe(const AVProbeData * p)71 static int str_probe(const 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;
76 
77     if (p->buf_size < RAW_CD_SECTOR_SIZE)
78         return 0;
79 
80     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
81         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
82 
83         /* RIFF header seen; skip 0x2C bytes */
84         sector += RIFF_HEADER_SIZE;
85     }
86 
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;
91 
92         if (sector[0x11] >= 32)
93             return 0;
94 
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                 vid++;
108 
109             }
110             break;
111         case CDXA_TYPE_AUDIO:
112             if(sector[0x13]&0x2A)
113                 return 0;
114             aud++;
115             break;
116         default:
117             if(sector[0x12] & CDXA_TYPE_MASK)
118                 return 0;
119         }
120         sector += RAW_CD_SECTOR_SIZE;
121     }
122     /* MPEG files (like those ripped from VCDs) can also look like this;
123      * only return half certainty */
124     if(vid+aud > 3)  return AVPROBE_SCORE_EXTENSION;
125     else if(vid+aud) return 1;
126     else             return 0;
127 }
128 
str_read_header(AVFormatContext * s)129 static int str_read_header(AVFormatContext *s)
130 {
131     AVIOContext *pb = s->pb;
132     StrDemuxContext *str = s->priv_data;
133     unsigned char sector[RAW_CD_SECTOR_SIZE];
134     int start;
135     int i;
136 
137     /* skip over any RIFF header */
138     if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
139         return AVERROR(EIO);
140     if (AV_RL32(&sector[0]) == RIFF_TAG)
141         start = RIFF_HEADER_SIZE;
142     else
143         start = 0;
144 
145     avio_seek(pb, start, SEEK_SET);
146 
147     for(i=0; i<32; i++){
148         str->channels[i].video_stream_index=
149         str->channels[i].audio_stream_index= -1;
150     }
151 
152     s->ctx_flags |= AVFMTCTX_NOHEADER;
153 
154     return 0;
155 }
156 
str_read_packet(AVFormatContext * s,AVPacket * ret_pkt)157 static int str_read_packet(AVFormatContext *s,
158                            AVPacket *ret_pkt)
159 {
160     AVIOContext *pb = s->pb;
161     StrDemuxContext *str = s->priv_data;
162     unsigned char sector[RAW_CD_SECTOR_SIZE];
163     int channel, ret;
164     AVPacket *pkt;
165     AVStream *st;
166 
167     while (1) {
168 
169         if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
170             return AVERROR(EIO);
171 
172         channel = sector[0x11];
173         if (channel >= 32)
174             return AVERROR_INVALIDDATA;
175 
176         switch (sector[0x12] & CDXA_TYPE_MASK) {
177 
178         case CDXA_TYPE_DATA:
179         case CDXA_TYPE_VIDEO:
180             {
181 
182                 int current_sector = AV_RL16(&sector[0x1C]);
183                 int sector_count   = AV_RL16(&sector[0x1E]);
184                 int frame_size = AV_RL32(&sector[0x24]);
185 
186                 if(!(   frame_size>=0
187                      && current_sector < sector_count
188                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
189                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
190                     break;
191                 }
192 
193                 if(str->channels[channel].video_stream_index < 0){
194                     /* allocate a new AVStream */
195                     st = avformat_new_stream(s, NULL);
196                     if (!st)
197                         return AVERROR(ENOMEM);
198                     avpriv_set_pts_info(st, 64, 1, 15);
199 
200                     str->channels[channel].video_stream_index = st->index;
201 
202                     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
203                     st->codecpar->codec_id   = AV_CODEC_ID_MDEC;
204                     st->codecpar->codec_tag  = 0;  /* no fourcc */
205                     st->codecpar->width      = AV_RL16(&sector[0x28]);
206                     st->codecpar->height     = AV_RL16(&sector[0x2A]);
207                 }
208 
209                 /* if this is the first sector of the frame, allocate a pkt */
210                 pkt = &str->channels[channel].tmp_pkt;
211 
212                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
213                     if(pkt->data)
214                         av_log(s, AV_LOG_ERROR, "mismatching sector_count\n");
215                     av_packet_unref(pkt);
216                     ret = av_new_packet(pkt, sector_count * VIDEO_DATA_CHUNK_SIZE);
217                     if (ret < 0)
218                         return ret;
219                     memset(pkt->data, 0, sector_count*VIDEO_DATA_CHUNK_SIZE);
220 
221                     pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
222                     pkt->stream_index =
223                         str->channels[channel].video_stream_index;
224                 }
225 
226                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
227                        sector + VIDEO_DATA_HEADER_SIZE,
228                        VIDEO_DATA_CHUNK_SIZE);
229 
230                 if (current_sector == sector_count-1) {
231                     pkt->size= frame_size;
232                     *ret_pkt = *pkt;
233                     pkt->data= NULL;
234                     pkt->size= -1;
235                     pkt->buf = NULL;
236                     return 0;
237                 }
238 
239             }
240             break;
241 
242         case CDXA_TYPE_AUDIO:
243             if(str->channels[channel].audio_stream_index < 0){
244                 int fmt = sector[0x13];
245                 /* allocate a new AVStream */
246                 st = avformat_new_stream(s, NULL);
247                 if (!st)
248                     return AVERROR(ENOMEM);
249 
250                 str->channels[channel].audio_stream_index = st->index;
251 
252                 st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
253                 st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_XA;
254                 st->codecpar->codec_tag   = 0;  /* no fourcc */
255                 av_channel_layout_default(&st->codecpar->ch_layout, (fmt & 1) + 1);
256                 st->codecpar->sample_rate = (fmt&4)?18900:37800;
257             //    st->codecpar->bit_rate = 0; //FIXME;
258                 st->codecpar->block_align = 128;
259 
260                 avpriv_set_pts_info(st, 64, 18 * 224 / st->codecpar->ch_layout.nb_channels,
261                                     st->codecpar->sample_rate);
262                 st->start_time = 0;
263             }
264             pkt = ret_pkt;
265             if ((ret = av_new_packet(pkt, 2304)) < 0)
266                 return ret;
267             memcpy(pkt->data,sector+24,2304);
268 
269             pkt->stream_index =
270                 str->channels[channel].audio_stream_index;
271             pkt->duration = 1;
272             return 0;
273         default:
274             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
275             /* drop the sector and move on */
276             break;
277         }
278 
279         if (avio_feof(pb))
280             return AVERROR(EIO);
281     }
282 }
283 
str_read_close(AVFormatContext * s)284 static int str_read_close(AVFormatContext *s)
285 {
286     StrDemuxContext *str = s->priv_data;
287     int i;
288     for(i=0; i<32; i++){
289         if(str->channels[i].tmp_pkt.data)
290             av_packet_unref(&str->channels[i].tmp_pkt);
291     }
292 
293     return 0;
294 }
295 
296 const AVInputFormat ff_str_demuxer = {
297     .name           = "psxstr",
298     .long_name      = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
299     .priv_data_size = sizeof(StrDemuxContext),
300     .read_probe     = str_probe,
301     .read_header    = str_read_header,
302     .read_packet    = str_read_packet,
303     .read_close     = str_read_close,
304     .flags          = AVFMT_NO_BYTE_SEEK,
305 };
306