libavformat/psxstr.c

   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 libavformat/psxstr.c
  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/intreadwrite.h"
  33 #include "avformat.h"
  34
  35 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
  36 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
  37
  38 #define RAW_CD_SECTOR_SIZE      2352
  39 #define RAW_CD_SECTOR_DATA_SIZE 2304
  40 #define VIDEO_DATA_CHUNK_SIZE   0x7E0
  41 #define VIDEO_DATA_HEADER_SIZE  0x38
  42 #define RIFF_HEADER_SIZE        0x2C
  43
  44 #define CDXA_TYPE_MASK     0x0E
  45 #define CDXA_TYPE_DATA     0x08
  46 #define CDXA_TYPE_AUDIO    0x04
  47 #define CDXA_TYPE_VIDEO    0x02
  48
  49 #define STR_MAGIC (0x80010160)
  50
  51 typedef struct StrChannel {
  52     /* video parameters */
  53     int video_stream_index;
  54     AVPacket tmp_pkt;
  55
  56     /* audio parameters */
  57     int audio_stream_index;
  58 } StrChannel;
  59
  60 typedef struct StrDemuxContext {
  61
  62     /* a STR file can contain up to 32 channels of data */
  63     StrChannel channels[32];
  64 } StrDemuxContext;
  65
  66 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
  67
  68 static int str_probe(AVProbeData *p)
  69 {
  70     uint8_t *sector= p->buf;
  71
  72     if (p->buf_size < RAW_CD_SECTOR_SIZE)
  73         return 0;
  74
  75     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
  76         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
  77
  78         /* RIFF header seen; skip 0x2C bytes */
  79         sector += RIFF_HEADER_SIZE;
  80     }
  81
  82     /* look for CD sync header (00, 0xFF x 10, 00) */
  83     if (memcmp(sector,sync_header,sizeof(sync_header)))
  84         return 0;
  85
  86     if(sector[0x11] >= 32)
  87         return 0;
  88     if(   (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
  89        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
  90        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
  91         return 0;
  92
  93     /* MPEG files (like those ripped from VCDs) can also look like this;
  94      * only return half certainty */
  95     return 50;
  96 }
  97
  98 static int str_read_header(AVFormatContext *s,
  99                            AVFormatParameters *ap)
 100 {
 101     ByteIOContext *pb = s->pb;
 102     StrDemuxContext *str = s->priv_data;
 103     unsigned char sector[RAW_CD_SECTOR_SIZE];
 104     int start;
 105     int i;
 106
 107     /* skip over any RIFF header */
 108     if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
 109         return AVERROR(EIO);
 110     if (AV_RL32(&sector[0]) == RIFF_TAG)
 111         start = RIFF_HEADER_SIZE;
 112     else
 113         start = 0;
 114
 115     url_fseek(pb, start, SEEK_SET);
 116
 117     for(i=0; i<32; i++){
 118         str->channels[i].video_stream_index=
 119         str->channels[i].audio_stream_index= -1;
 120     }
 121
 122     s->ctx_flags |= AVFMTCTX_NOHEADER;
 123
 124     return 0;
 125 }
 126
 127 static int str_read_packet(AVFormatContext *s,
 128                            AVPacket *ret_pkt)
 129 {
 130     ByteIOContext *pb = s->pb;
 131     StrDemuxContext *str = s->priv_data;
 132     unsigned char sector[RAW_CD_SECTOR_SIZE];
 133     int channel;
 134     AVPacket *pkt;
 135     AVStream *st;
 136
 137     while (1) {
 138
 139         if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
 140             return AVERROR(EIO);
 141
 142         channel = sector[0x11];
 143         if (channel >= 32)
 144             return AVERROR_INVALIDDATA;
 145
 146         switch (sector[0x12] & CDXA_TYPE_MASK) {
 147
 148         case CDXA_TYPE_DATA:
 149         case CDXA_TYPE_VIDEO:
 150             {
 151
 152                 int current_sector = AV_RL16(&sector[0x1C]);
 153                 int sector_count   = AV_RL16(&sector[0x1E]);
 154                 int frame_size = AV_RL32(&sector[0x24]);
 155
 156                 if(!(   frame_size>=0
 157                      && current_sector < sector_count
 158                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
 159                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
 160                     break;
 161                 }
 162
 163                 if(str->channels[channel].video_stream_index < 0){
 164                     /* allocate a new AVStream */
 165                     st = av_new_stream(s, 0);
 166                     if (!st)
 167                         return AVERROR(ENOMEM);
 168                     av_set_pts_info(st, 64, 1, 15);
 169
 170                     str->channels[channel].video_stream_index = st->index;
 171
 172                     st->codec->codec_type = CODEC_TYPE_VIDEO;
 173                     st->codec->codec_id   = CODEC_ID_MDEC;
 174                     st->codec->codec_tag  = 0;  /* no fourcc */
 175                     st->codec->width      = AV_RL16(&sector[0x28]);
 176                     st->codec->height     = AV_RL16(&sector[0x2A]);
 177                 }
 178
 179                 /* if this is the first sector of the frame, allocate a pkt */
 180                 pkt = &str->channels[channel].tmp_pkt;
 181
 182                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
 183                     if(pkt->data)
 184                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
 185                     av_free_packet(pkt);
 186                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
 187                         return AVERROR(EIO);
 188
 189                     pkt->pos= url_ftell(pb) - RAW_CD_SECTOR_SIZE;
 190                     pkt->stream_index =
 191                         str->channels[channel].video_stream_index;
 192                 }
 193
 194                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
 195                        sector + VIDEO_DATA_HEADER_SIZE,
 196                        VIDEO_DATA_CHUNK_SIZE);
 197
 198                 if (current_sector == sector_count-1) {
 199                     pkt->size= frame_size;
 200                     *ret_pkt = *pkt;
 201                     pkt->data= NULL;
 202                     pkt->size= -1;
 203                     return 0;
 204                 }
 205
 206             }
 207             break;
 208
 209         case CDXA_TYPE_AUDIO:
 210             if(str->channels[channel].audio_stream_index < 0){
 211                 int fmt = sector[0x13];
 212                 /* allocate a new AVStream */
 213                 st = av_new_stream(s, 0);
 214                 if (!st)
 215                     return AVERROR(ENOMEM);
 216
 217                 str->channels[channel].audio_stream_index = st->index;
 218
 219                 st->codec->codec_type  = CODEC_TYPE_AUDIO;
 220                 st->codec->codec_id    = CODEC_ID_ADPCM_XA;
 221                 st->codec->codec_tag   = 0;  /* no fourcc */
 222                 st->codec->channels    = (fmt&1)?2:1;
 223                 st->codec->sample_rate = (fmt&4)?18900:37800;
 224             //    st->codec->bit_rate = 0; //FIXME;
 225                 st->codec->block_align = 128;
 226
 227                 av_set_pts_info(st, 64, 128, st->codec->sample_rate);
 228             }
 229             pkt = ret_pkt;
 230             if (av_new_packet(pkt, 2304))
 231                 return AVERROR(EIO);
 232             memcpy(pkt->data,sector+24,2304);
 233
 234             pkt->stream_index =
 235                 str->channels[channel].audio_stream_index;
 236             return 0;
 237             break;
 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 (url_feof(pb))
 245             return AVERROR(EIO);
 246     }
 247 }
 248
 249 static int str_read_close(AVFormatContext *s)
 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
 261 AVInputFormat str_demuxer = {
 262     "psxstr",
 263     NULL_IF_CONFIG_SMALL("Sony Playstation STR format"),
 264     sizeof(StrDemuxContext),
 265     str_probe,
 266     str_read_header,
 267     str_read_packet,
 268     str_read_close,
 269 };