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libavformat/psxstr.c

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00001 /*
00002  * Sony Playstation (PSX) STR File Demuxer
00003  * Copyright (c) 2003 The ffmpeg Project
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00032 #include "libavutil/intreadwrite.h"
00033 #include "avformat.h"
00034 
00035 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
00036 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
00037 
00038 #define RAW_CD_SECTOR_SIZE      2352
00039 #define RAW_CD_SECTOR_DATA_SIZE 2304
00040 #define VIDEO_DATA_CHUNK_SIZE   0x7E0
00041 #define VIDEO_DATA_HEADER_SIZE  0x38
00042 #define RIFF_HEADER_SIZE        0x2C
00043 
00044 #define CDXA_TYPE_MASK     0x0E
00045 #define CDXA_TYPE_DATA     0x08
00046 #define CDXA_TYPE_AUDIO    0x04
00047 #define CDXA_TYPE_VIDEO    0x02
00048 
00049 #define STR_MAGIC (0x80010160)
00050 
00051 typedef struct StrChannel {
00052     /* video parameters */
00053     int video_stream_index;
00054     AVPacket tmp_pkt;
00055 
00056     /* audio parameters */
00057     int audio_stream_index;
00058 } StrChannel;
00059 
00060 typedef struct StrDemuxContext {
00061 
00062     /* a STR file can contain up to 32 channels of data */
00063     StrChannel channels[32];
00064 } StrDemuxContext;
00065 
00066 static const char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
00067 
00068 static int str_probe(AVProbeData *p)
00069 {
00070     uint8_t *sector= p->buf;
00071 
00072     if (p->buf_size < RAW_CD_SECTOR_SIZE)
00073         return 0;
00074 
00075     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
00076         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
00077 
00078         /* RIFF header seen; skip 0x2C bytes */
00079         sector += RIFF_HEADER_SIZE;
00080     }
00081 
00082     /* look for CD sync header (00, 0xFF x 10, 00) */
00083     if (memcmp(sector,sync_header,sizeof(sync_header)))
00084         return 0;
00085 
00086     if(sector[0x11] >= 32)
00087         return 0;
00088     if(   (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
00089        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
00090        && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
00091         return 0;
00092 
00093     /* MPEG files (like those ripped from VCDs) can also look like this;
00094      * only return half certainty */
00095     return 50;
00096 }
00097 
00098 static int str_read_header(AVFormatContext *s,
00099                            AVFormatParameters *ap)
00100 {
00101     ByteIOContext *pb = s->pb;
00102     StrDemuxContext *str = s->priv_data;
00103     unsigned char sector[RAW_CD_SECTOR_SIZE];
00104     int start;
00105     int i;
00106 
00107     /* skip over any RIFF header */
00108     if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
00109         return AVERROR(EIO);
00110     if (AV_RL32(&sector[0]) == RIFF_TAG)
00111         start = RIFF_HEADER_SIZE;
00112     else
00113         start = 0;
00114 
00115     url_fseek(pb, start, SEEK_SET);
00116 
00117     for(i=0; i<32; i++){
00118         str->channels[i].video_stream_index=
00119         str->channels[i].audio_stream_index= -1;
00120     }
00121 
00122     s->ctx_flags |= AVFMTCTX_NOHEADER;
00123 
00124     return 0;
00125 }
00126 
00127 static int str_read_packet(AVFormatContext *s,
00128                            AVPacket *ret_pkt)
00129 {
00130     ByteIOContext *pb = s->pb;
00131     StrDemuxContext *str = s->priv_data;
00132     unsigned char sector[RAW_CD_SECTOR_SIZE];
00133     int channel;
00134     AVPacket *pkt;
00135     AVStream *st;
00136 
00137     while (1) {
00138 
00139         if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
00140             return AVERROR(EIO);
00141 
00142         channel = sector[0x11];
00143         if (channel >= 32)
00144             return AVERROR_INVALIDDATA;
00145 
00146         switch (sector[0x12] & CDXA_TYPE_MASK) {
00147 
00148         case CDXA_TYPE_DATA:
00149         case CDXA_TYPE_VIDEO:
00150             {
00151 
00152                 int current_sector = AV_RL16(&sector[0x1C]);
00153                 int sector_count   = AV_RL16(&sector[0x1E]);
00154                 int frame_size = AV_RL32(&sector[0x24]);
00155 
00156                 if(!(   frame_size>=0
00157                      && current_sector < sector_count
00158                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
00159                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
00160                     break;
00161                 }
00162 
00163                 if(str->channels[channel].video_stream_index < 0){
00164                     /* allocate a new AVStream */
00165                     st = av_new_stream(s, 0);
00166                     if (!st)
00167                         return AVERROR(ENOMEM);
00168                     av_set_pts_info(st, 64, 1, 15);
00169 
00170                     str->channels[channel].video_stream_index = st->index;
00171 
00172                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00173                     st->codec->codec_id   = CODEC_ID_MDEC;
00174                     st->codec->codec_tag  = 0;  /* no fourcc */
00175                     st->codec->width      = AV_RL16(&sector[0x28]);
00176                     st->codec->height     = AV_RL16(&sector[0x2A]);
00177                 }
00178 
00179                 /* if this is the first sector of the frame, allocate a pkt */
00180                 pkt = &str->channels[channel].tmp_pkt;
00181 
00182                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
00183                     if(pkt->data)
00184                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
00185                     av_free_packet(pkt);
00186                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
00187                         return AVERROR(EIO);
00188 
00189                     pkt->pos= url_ftell(pb) - RAW_CD_SECTOR_SIZE;
00190                     pkt->stream_index =
00191                         str->channels[channel].video_stream_index;
00192                 }
00193 
00194                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
00195                        sector + VIDEO_DATA_HEADER_SIZE,
00196                        VIDEO_DATA_CHUNK_SIZE);
00197 
00198                 if (current_sector == sector_count-1) {
00199                     pkt->size= frame_size;
00200                     *ret_pkt = *pkt;
00201                     pkt->data= NULL;
00202                     pkt->size= -1;
00203                     return 0;
00204                 }
00205 
00206             }
00207             break;
00208 
00209         case CDXA_TYPE_AUDIO:
00210             if(str->channels[channel].audio_stream_index < 0){
00211                 int fmt = sector[0x13];
00212                 /* allocate a new AVStream */
00213                 st = av_new_stream(s, 0);
00214                 if (!st)
00215                     return AVERROR(ENOMEM);
00216 
00217                 str->channels[channel].audio_stream_index = st->index;
00218 
00219                 st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
00220                 st->codec->codec_id    = CODEC_ID_ADPCM_XA;
00221                 st->codec->codec_tag   = 0;  /* no fourcc */
00222                 st->codec->channels    = (fmt&1)?2:1;
00223                 st->codec->sample_rate = (fmt&4)?18900:37800;
00224             //    st->codec->bit_rate = 0; //FIXME;
00225                 st->codec->block_align = 128;
00226 
00227                 av_set_pts_info(st, 64, 128, st->codec->sample_rate);
00228             }
00229             pkt = ret_pkt;
00230             if (av_new_packet(pkt, 2304))
00231                 return AVERROR(EIO);
00232             memcpy(pkt->data,sector+24,2304);
00233 
00234             pkt->stream_index =
00235                 str->channels[channel].audio_stream_index;
00236             return 0;
00237             break;
00238         default:
00239             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
00240             /* drop the sector and move on */
00241             break;
00242         }
00243 
00244         if (url_feof(pb))
00245             return AVERROR(EIO);
00246     }
00247 }
00248 
00249 static int str_read_close(AVFormatContext *s)
00250 {
00251     StrDemuxContext *str = s->priv_data;
00252     int i;
00253     for(i=0; i<32; i++){
00254         if(str->channels[i].tmp_pkt.data)
00255             av_free_packet(&str->channels[i].tmp_pkt);
00256     }
00257 
00258     return 0;
00259 }
00260 
00261 AVInputFormat str_demuxer = {
00262     "psxstr",
00263     NULL_IF_CONFIG_SMALL("Sony Playstation STR format"),
00264     sizeof(StrDemuxContext),
00265     str_probe,
00266     str_read_header,
00267     str_read_packet,
00268     str_read_close,
00269 };

Generated on Fri Sep 16 2011 17:17:50 for FFmpeg by  doxygen 1.7.1