2 * Sony Playstation (PSX) STR File Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of Libav.
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.
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.
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
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/intreadwrite.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;
58 /* audio parameters */
59 int audio_stream_index;
62 typedef struct StrDemuxContext {
64 /* a STR file can contain up to 32 channels of data */
65 StrChannel channels[32];
68 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
70 static int str_probe(AVProbeData *p)
72 uint8_t *sector= p->buf;
74 if (p->buf_size < RAW_CD_SECTOR_SIZE)
77 if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
78 (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
80 /* RIFF header seen; skip 0x2C bytes */
81 sector += RIFF_HEADER_SIZE;
84 /* look for CD sync header (00, 0xFF x 10, 00) */
85 if (memcmp(sector,sync_header,sizeof(sync_header)))
88 if(sector[0x11] >= 32)
90 if( (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
91 && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
92 && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
95 /* MPEG files (like those ripped from VCDs) can also look like this;
96 * only return half certainty */
97 return AVPROBE_SCORE_EXTENSION;
100 static int str_read_header(AVFormatContext *s)
102 AVIOContext *pb = s->pb;
103 StrDemuxContext *str = s->priv_data;
104 unsigned char sector[RAW_CD_SECTOR_SIZE];
108 /* skip over any RIFF header */
109 if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
111 if (AV_RL32(§or[0]) == RIFF_TAG)
112 start = RIFF_HEADER_SIZE;
116 avio_seek(pb, start, SEEK_SET);
119 str->channels[i].video_stream_index=
120 str->channels[i].audio_stream_index= -1;
123 s->ctx_flags |= AVFMTCTX_NOHEADER;
128 static int str_read_packet(AVFormatContext *s,
131 AVIOContext *pb = s->pb;
132 StrDemuxContext *str = s->priv_data;
133 unsigned char sector[RAW_CD_SECTOR_SIZE];
140 if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
143 channel = sector[0x11];
145 return AVERROR_INVALIDDATA;
147 switch (sector[0x12] & CDXA_TYPE_MASK) {
150 case CDXA_TYPE_VIDEO:
153 int current_sector = AV_RL16(§or[0x1C]);
154 int sector_count = AV_RL16(§or[0x1E]);
155 int frame_size = AV_RL32(§or[0x24]);
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);
164 if(str->channels[channel].video_stream_index < 0){
165 /* allocate a new AVStream */
166 st = avformat_new_stream(s, NULL);
168 return AVERROR(ENOMEM);
169 avpriv_set_pts_info(st, 64, 1, 15);
171 str->channels[channel].video_stream_index = st->index;
173 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
174 st->codec->codec_id = AV_CODEC_ID_MDEC;
175 st->codec->codec_tag = 0; /* no fourcc */
176 st->codec->width = AV_RL16(§or[0x28]);
177 st->codec->height = AV_RL16(§or[0x2A]);
180 /* if this is the first sector of the frame, allocate a pkt */
181 pkt = &str->channels[channel].tmp_pkt;
183 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
185 av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
187 if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
190 pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
192 str->channels[channel].video_stream_index;
195 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
196 sector + VIDEO_DATA_HEADER_SIZE,
197 VIDEO_DATA_CHUNK_SIZE);
199 if (current_sector == sector_count-1) {
200 pkt->size= frame_size;
205 #if FF_API_DESTRUCT_PACKET
206 pkt->destruct = NULL;
214 case CDXA_TYPE_AUDIO:
215 if(str->channels[channel].audio_stream_index < 0){
216 int fmt = sector[0x13];
217 /* allocate a new AVStream */
218 st = avformat_new_stream(s, NULL);
220 return AVERROR(ENOMEM);
222 str->channels[channel].audio_stream_index = st->index;
224 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
225 st->codec->codec_id = AV_CODEC_ID_ADPCM_XA;
226 st->codec->codec_tag = 0; /* no fourcc */
228 st->codec->channels = 2;
229 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
231 st->codec->channels = 1;
232 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
234 st->codec->sample_rate = (fmt&4)?18900:37800;
235 // st->codec->bit_rate = 0; //FIXME;
236 st->codec->block_align = 128;
238 avpriv_set_pts_info(st, 64, 18 * 224 / st->codec->channels,
239 st->codec->sample_rate);
243 if (av_new_packet(pkt, 2304))
245 memcpy(pkt->data,sector+24,2304);
248 str->channels[channel].audio_stream_index;
252 av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
253 /* drop the sector and move on */
262 static int str_read_close(AVFormatContext *s)
264 StrDemuxContext *str = s->priv_data;
267 if(str->channels[i].tmp_pkt.data)
268 av_free_packet(&str->channels[i].tmp_pkt);
274 AVInputFormat ff_str_demuxer = {
276 .long_name = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
277 .priv_data_size = sizeof(StrDemuxContext),
278 .read_probe = str_probe,
279 .read_header = str_read_header,
280 .read_packet = str_read_packet,
281 .read_close = str_read_close,
282 .flags = AVFMT_NO_BYTE_SEEK,