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 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 "avformat.h"
  33
  34 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
  35 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
  36
  37 #define RAW_CD_SECTOR_SIZE      2352
  38 #define RAW_CD_SECTOR_DATA_SIZE 2304
  39 #define VIDEO_DATA_CHUNK_SIZE   0x7E0
  40 #define VIDEO_DATA_HEADER_SIZE  0x38
  41 #define RIFF_HEADER_SIZE        0x2C
  42
  43 #define CDXA_TYPE_MASK     0x0E
  44 #define CDXA_TYPE_DATA     0x08
  45 #define CDXA_TYPE_AUDIO    0x04
  46 #define CDXA_TYPE_VIDEO    0x02
  47
  48 #define STR_MAGIC (0x80010160)
  49
  50 typedef struct StrChannel {
  51     /* video parameters */
  52     int video_stream_index;
  53     AVPacket tmp_pkt;
  54
  55     /* audio parameters */
  56     int audio_stream_index;
  57 } StrChannel;
  58
  59 typedef struct StrDemuxContext {
  60
  61     /* a STR file can contain up to 32 channels of data */
  62     StrChannel channels[32];
  63 } StrDemuxContext;
  64
  65 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
  66
  67 static int str_probe(AVProbeData *p)
  68 {
  69     uint8_t *sector= p->buf;
  70
  71     if (p->buf_size < RAW_CD_SECTOR_SIZE)
  72         return 0;
  73
  74     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
  75         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
  76
  77         /* RIFF header seen; skip 0x2C bytes */
  78         sector += RIFF_HEADER_SIZE;
  79     }
  80
  81     /* look for CD sync header (00, 0xFF x 10, 00) */
  82     if (memcmp(sector,sync_header,sizeof(sync_header)))
  83         return 0;
  84
  85     if(sector[0x11] >= 32)
  86         return 0;
  87     if(   (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
  88        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
  89        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
  90         return 0;
  91
  92     /* MPEG files (like those ripped from VCDs) can also look like this;
  93      * only return half certainty */
  94     return 50;
  95 }
  96
  97 static int str_read_header(AVFormatContext *s,
  98                            AVFormatParameters *ap)
  99 {
 100     ByteIOContext *pb = s->pb;
 101     StrDemuxContext *str = s->priv_data;
 102     unsigned char sector[RAW_CD_SECTOR_SIZE];
 103     int start;
 104     int i;
 105
 106     /* skip over any RIFF header */
 107     if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
 108         return AVERROR(EIO);
 109     if (AV_RL32(&sector[0]) == RIFF_TAG)
 110         start = RIFF_HEADER_SIZE;
 111     else
 112         start = 0;
 113
 114     url_fseek(pb, start, SEEK_SET);
 115
 116     for(i=0; i<32; i++){
 117         str->channels[i].video_stream_index=
 118         str->channels[i].audio_stream_index= -1;
 119     }
 120
 121     s->ctx_flags |= AVFMTCTX_NOHEADER;
 122
 123     return 0;
 124 }
 125
 126 static int str_read_packet(AVFormatContext *s,
 127                            AVPacket *ret_pkt)
 128 {
 129     ByteIOContext *pb = s->pb;
 130     StrDemuxContext *str = s->priv_data;
 131     unsigned char sector[RAW_CD_SECTOR_SIZE];
 132     int channel;
 133     AVPacket *pkt;
 134     AVStream *st;
 135
 136     while (1) {
 137
 138         if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
 139             return AVERROR(EIO);
 140
 141         channel = sector[0x11];
 142         if (channel >= 32)
 143             return AVERROR_INVALIDDATA;
 144
 145         switch (sector[0x12] & CDXA_TYPE_MASK) {
 146
 147         case CDXA_TYPE_DATA:
 148         case CDXA_TYPE_VIDEO:
 149             {
 150
 151                 int current_sector = AV_RL16(&sector[0x1C]);
 152                 int sector_count   = AV_RL16(&sector[0x1E]);
 153                 int frame_size = AV_RL32(&sector[0x24]);
 154
 155                 if(!(   frame_size>=0
 156                      && current_sector < sector_count
 157                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
 158                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
 159                     break;
 160                 }
 161
 162                 if(str->channels[channel].video_stream_index < 0){
 163                     /* allocate a new AVStream */
 164                     st = av_new_stream(s, 0);
 165                     if (!st)
 166                         return AVERROR(ENOMEM);
 167                     av_set_pts_info(st, 64, 1, 15);
 168
 169                     str->channels[channel].video_stream_index = st->index;
 170
 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(&sector[0x28]);
 175                     st->codec->height     = AV_RL16(&sector[0x2A]);
 176                 }
 177
 178                 /* if this is the first sector of the frame, allocate a pkt */
 179                 pkt = &str->channels[channel].tmp_pkt;
 180
 181                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
 182                     if(pkt->data)
 183                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
 184                     av_free_packet(pkt);
 185                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
 186                         return AVERROR(EIO);
 187
 188                     pkt->pos= url_ftell(pb) - RAW_CD_SECTOR_SIZE;
 189                     pkt->stream_index =
 190                         str->channels[channel].video_stream_index;
 191                 }
 192
 193                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
 194                        sector + VIDEO_DATA_HEADER_SIZE,
 195                        VIDEO_DATA_CHUNK_SIZE);
 196
 197                 if (current_sector == sector_count-1) {
 198                     pkt->size= frame_size;
 199                     *ret_pkt = *pkt;
 200                     pkt->data= NULL;
 201                     pkt->size= -1;
 202                     return 0;
 203                 }
 204
 205             }
 206             break;
 207
 208         case CDXA_TYPE_AUDIO:
 209             if(str->channels[channel].audio_stream_index < 0){
 210                 int fmt = sector[0x13];
 211                 /* allocate a new AVStream */
 212                 st = av_new_stream(s, 0);
 213                 if (!st)
 214                     return AVERROR(ENOMEM);
 215
 216                 str->channels[channel].audio_stream_index = st->index;
 217
 218                 st->codec->codec_type  = CODEC_TYPE_AUDIO;
 219                 st->codec->codec_id    = CODEC_ID_ADPCM_XA;
 220                 st->codec->codec_tag   = 0;  /* no fourcc */
 221                 st->codec->channels    = (fmt&1)?2:1;
 222                 st->codec->sample_rate = (fmt&4)?18900:37800;
 223             //    st->codec->bit_rate = 0; //FIXME;
 224                 st->codec->block_align = 128;
 225
 226                 av_set_pts_info(st, 64, 128, st->codec->sample_rate);
 227             }
 228             pkt = ret_pkt;
 229             if (av_new_packet(pkt, 2304))
 230                 return AVERROR(EIO);
 231             memcpy(pkt->data,sector+24,2304);
 232
 233             pkt->stream_index =
 234                 str->channels[channel].audio_stream_index;
 235             return 0;
 236             break;
 237         default:
 238             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
 239             /* drop the sector and move on */
 240             break;
 241         }
 242
 243         if (url_feof(pb))
 244             return AVERROR(EIO);
 245     }
 246 }
 247
 248 static int str_read_close(AVFormatContext *s)
 249 {
 250     StrDemuxContext *str = s->priv_data;
 251     int i;
 252     for(i=0; i<32; i++){
 253         if(str->channels[i].tmp_pkt.data)
 254             av_free_packet(&str->channels[i].tmp_pkt);
 255     }
 256
 257     return 0;
 258 }
 259
 260 AVInputFormat str_demuxer = {
 261     "psxstr",
 262     NULL_IF_CONFIG_SMALL("Sony Playstation STR format"),
 263     sizeof(StrDemuxContext),
 264     str_probe,
 265     str_read_header,
 266     str_read_packet,
 267     str_read_close,
 268 };