2 * Sony Playstation (PSX) STR File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
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.
36 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
37 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
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
45 #define CDXA_TYPE_MASK 0x0E
46 #define CDXA_TYPE_DATA 0x08
47 #define CDXA_TYPE_AUDIO 0x04
48 #define CDXA_TYPE_VIDEO 0x02
50 #define STR_MAGIC (0x80010160)
52 typedef struct StrChannel {
53 /* video parameters */
54 int video_stream_index;
56 /* audio parameters */
57 int audio_stream_index;
60 typedef struct StrDemuxContext {
62 /* a STR file can contain up to 32 channels of data */
63 StrChannel channels[32];
65 /* only decode the first audio and video channels encountered */
74 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
76 static int str_probe(AVProbeData *p)
80 /* need at least 0x38 bytes to validate */
81 if (p->buf_size < 0x38)
84 if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
85 (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
87 /* RIFF header seen; skip 0x2C bytes */
88 start = RIFF_HEADER_SIZE;
92 /* look for CD sync header (00, 0xFF x 10, 00) */
93 if (memcmp(p->buf+start,sync_header,sizeof(sync_header)))
96 /* MPEG files (like those ripped from VCDs) can also look like this;
97 * only return half certainty */
102 static void dump(unsigned char *buf,size_t len)
106 if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
107 av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
108 if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
110 av_log(NULL, AV_LOG_DEBUG, "\n");
114 static int str_read_header(AVFormatContext *s,
115 AVFormatParameters *ap)
117 ByteIOContext *pb = s->pb;
118 StrDemuxContext *str = s->priv_data;
120 unsigned char sector[RAW_CD_SECTOR_SIZE];
125 /* initialize context members */
127 str->audio_channel = -1; /* assume to audio or video */
128 str->video_channel = -1;
131 /* skip over any RIFF header */
132 if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
134 if (AV_RL32(§or[0]) == RIFF_TAG)
135 start = RIFF_HEADER_SIZE;
139 url_fseek(pb, start, SEEK_SET);
141 /* check through the first 32 sectors for individual channels */
142 for (i = 0; i < 32; i++) {
143 if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
146 //printf("%02x %02x %02x %02x\n",sector[0x10],sector[0x11],sector[0x12],sector[0x13]);
148 channel = sector[0x11];
150 return AVERROR_INVALIDDATA;
152 switch (sector[0x12] & CDXA_TYPE_MASK) {
155 case CDXA_TYPE_VIDEO:
156 /* check if this channel gets to be the dominant video channel */
157 if (str->video_channel == -1) {
158 /* qualify the magic number */
159 if (AV_RL32(§or[0x18]) != STR_MAGIC)
161 str->video_channel = channel;
163 /* allocate a new AVStream */
164 st = av_new_stream(s, 0);
166 return AVERROR(ENOMEM);
167 av_set_pts_info(st, 64, 1, 15);
169 str->channels[channel].video_stream_index = st->index;
171 st->codec->codec_type = CODEC_TYPE_VIDEO;
172 st->codec->codec_id = CODEC_ID_MDEC;
173 st->codec->codec_tag = 0; /* no fourcc */
174 st->codec->width = AV_RL16(§or[0x28]);
175 st->codec->height = AV_RL16(§or[0x2A]);
179 case CDXA_TYPE_AUDIO:
180 /* check if this channel gets to be the dominant audio channel */
181 if (str->audio_channel == -1) {
183 str->audio_channel = channel;
185 /* allocate a new AVStream */
186 st = av_new_stream(s, 0);
188 return AVERROR(ENOMEM);
190 str->channels[channel].audio_stream_index = st->index;
193 st->codec->codec_type = CODEC_TYPE_AUDIO;
194 st->codec->codec_id = CODEC_ID_ADPCM_XA;
195 st->codec->codec_tag = 0; /* no fourcc */
196 st->codec->channels = (fmt&1)?2:1;
197 st->codec->sample_rate = (fmt&4)?18900:37800;
198 // st->codec->bit_rate = 0; //FIXME;
199 st->codec->block_align = 128;
201 av_set_pts_info(st, 64, 128, st->codec->sample_rate);
211 /* back to the start */
212 url_fseek(pb, start, SEEK_SET);
217 static int str_read_packet(AVFormatContext *s,
220 ByteIOContext *pb = s->pb;
221 StrDemuxContext *str = s->priv_data;
222 unsigned char sector[RAW_CD_SECTOR_SIZE];
228 if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
231 channel = sector[0x11];
233 return AVERROR_INVALIDDATA;
235 switch (sector[0x12] & CDXA_TYPE_MASK) {
238 case CDXA_TYPE_VIDEO:
239 /* check if this the video channel we care about */
240 if (channel == str->video_channel) {
242 int current_sector = AV_RL16(§or[0x1C]);
243 int sector_count = AV_RL16(§or[0x1E]);
244 int frame_size = AV_RL32(§or[0x24]);
247 && current_sector < sector_count
248 && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
249 av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
250 return AVERROR_INVALIDDATA;
253 // printf("%d %d %d\n",current_sector,sector_count,frame_size);
254 /* if this is the first sector of the frame, allocate a pkt */
257 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
259 av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
261 if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
264 pkt->pos= url_ftell(pb) - RAW_CD_SECTOR_SIZE;
266 str->channels[channel].video_stream_index;
267 // pkt->pts = str->pts;
269 /* if there is no audio, adjust the pts after every video
270 * frame; assume 15 fps */
271 if (str->audio_channel != -1)
272 str->pts += (90000 / 15);
275 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
276 sector + VIDEO_DATA_HEADER_SIZE,
277 VIDEO_DATA_CHUNK_SIZE);
279 if (current_sector == sector_count-1) {
280 pkt->size= frame_size;
290 case CDXA_TYPE_AUDIO:
292 printf (" dropping audio sector\n");
295 /* check if this the video channel we care about */
296 if (channel == str->audio_channel) {
298 if (av_new_packet(pkt, 2304))
300 memcpy(pkt->data,sector+24,2304);
303 str->channels[channel].audio_stream_index;
304 //pkt->pts = str->pts;
310 /* drop the sector and move on */
312 printf (" dropping other sector\n");
322 static int str_read_close(AVFormatContext *s)
324 StrDemuxContext *str = s->priv_data;
329 AVInputFormat str_demuxer = {
331 NULL_IF_CONFIG_SMALL("Sony Playstation STR format"),
332 sizeof(StrDemuxContext),