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.
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/intreadwrite.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;
59 /* audio parameters */
60 int audio_stream_index;
63 typedef struct StrDemuxContext {
65 /* a STR file can contain up to 32 channels of data */
66 StrChannel channels[32];
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(const AVProbeData *p)
73 const uint8_t *sector= p->buf;
74 const uint8_t *end= sector + p->buf_size;
77 if (p->buf_size < RAW_CD_SECTOR_SIZE)
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;
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)))
92 if (sector[0x11] >= 32)
95 switch (sector[0x12] & CDXA_TYPE_MASK) {
97 case CDXA_TYPE_VIDEO: {
98 int current_sector = AV_RL16(§or[0x1C]);
99 int sector_count = AV_RL16(§or[0x1E]);
100 int frame_size = AV_RL32(§or[0x24]);
103 && current_sector < sector_count
104 && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
111 case CDXA_TYPE_AUDIO:
112 if(sector[0x13]&0x2A)
117 if(sector[0x12] & CDXA_TYPE_MASK)
120 sector += RAW_CD_SECTOR_SIZE;
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;
129 static int str_read_header(AVFormatContext *s)
131 AVIOContext *pb = s->pb;
132 StrDemuxContext *str = s->priv_data;
133 unsigned char sector[RAW_CD_SECTOR_SIZE];
137 /* skip over any RIFF header */
138 if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
140 if (AV_RL32(§or[0]) == RIFF_TAG)
141 start = RIFF_HEADER_SIZE;
145 avio_seek(pb, start, SEEK_SET);
148 str->channels[i].video_stream_index=
149 str->channels[i].audio_stream_index= -1;
152 s->ctx_flags |= AVFMTCTX_NOHEADER;
157 static int str_read_packet(AVFormatContext *s,
160 AVIOContext *pb = s->pb;
161 StrDemuxContext *str = s->priv_data;
162 unsigned char sector[RAW_CD_SECTOR_SIZE];
169 if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
172 channel = sector[0x11];
174 return AVERROR_INVALIDDATA;
176 switch (sector[0x12] & CDXA_TYPE_MASK) {
179 case CDXA_TYPE_VIDEO:
182 int current_sector = AV_RL16(§or[0x1C]);
183 int sector_count = AV_RL16(§or[0x1E]);
184 int frame_size = AV_RL32(§or[0x24]);
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);
193 if(str->channels[channel].video_stream_index < 0){
194 /* allocate a new AVStream */
195 st = avformat_new_stream(s, NULL);
197 return AVERROR(ENOMEM);
198 avpriv_set_pts_info(st, 64, 1, 15);
200 str->channels[channel].video_stream_index = st->index;
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(§or[0x28]);
206 st->codecpar->height = AV_RL16(§or[0x2A]);
209 /* if this is the first sector of the frame, allocate a pkt */
210 pkt = &str->channels[channel].tmp_pkt;
212 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
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);
219 memset(pkt->data, 0, sector_count*VIDEO_DATA_CHUNK_SIZE);
221 pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
223 str->channels[channel].video_stream_index;
226 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
227 sector + VIDEO_DATA_HEADER_SIZE,
228 VIDEO_DATA_CHUNK_SIZE);
230 if (current_sector == sector_count-1) {
231 pkt->size= frame_size;
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);
248 return AVERROR(ENOMEM);
250 str->channels[channel].audio_stream_index = st->index;
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 */
256 st->codecpar->channels = 2;
257 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
259 st->codecpar->channels = 1;
260 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
262 st->codecpar->sample_rate = (fmt&4)?18900:37800;
263 // st->codecpar->bit_rate = 0; //FIXME;
264 st->codecpar->block_align = 128;
266 avpriv_set_pts_info(st, 64, 18 * 224 / st->codecpar->channels,
267 st->codecpar->sample_rate);
271 if ((ret = av_new_packet(pkt, 2304)) < 0)
273 memcpy(pkt->data,sector+24,2304);
276 str->channels[channel].audio_stream_index;
280 av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
281 /* drop the sector and move on */
290 static int str_read_close(AVFormatContext *s)
292 StrDemuxContext *str = s->priv_data;
295 if(str->channels[i].tmp_pkt.data)
296 av_packet_unref(&str->channels[i].tmp_pkt);
302 AVInputFormat ff_str_demuxer = {
304 .long_name = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
305 .priv_data_size = sizeof(StrDemuxContext),
306 .read_probe = str_probe,
307 .read_header = str_read_header,
308 .read_packet = str_read_packet,
309 .read_close = str_read_close,
310 .flags = AVFMT_NO_BYTE_SEEK,