FFmpeg: libavformat/psxstr.c Source File

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/channel_layout.h"
00033 #include "libavutil/intreadwrite.h"
00034 #include "avformat.h"
00035 #include "internal.h"
00036 
00037 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
00038 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
00039 
00040 #define RAW_CD_SECTOR_SIZE      2352
00041 #define RAW_CD_SECTOR_DATA_SIZE 2304
00042 #define VIDEO_DATA_CHUNK_SIZE   0x7E0
00043 #define VIDEO_DATA_HEADER_SIZE  0x38
00044 #define RIFF_HEADER_SIZE        0x2C
00045 
00046 #define CDXA_TYPE_MASK     0x0E
00047 #define CDXA_TYPE_DATA     0x08
00048 #define CDXA_TYPE_AUDIO    0x04
00049 #define CDXA_TYPE_VIDEO    0x02
00050 
00051 #define STR_MAGIC (0x80010160)
00052 
00053 typedef struct StrChannel {
00054     /* video parameters */
00055     int video_stream_index;
00056     AVPacket tmp_pkt;
00057 
00058     /* audio parameters */
00059     int audio_stream_index;
00060 } StrChannel;
00061 
00062 typedef struct StrDemuxContext {
00063 
00064     /* a STR file can contain up to 32 channels of data */
00065     StrChannel channels[32];
00066 } StrDemuxContext;
00067 
00068 static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
00069 
00070 static int str_probe(AVProbeData *p)
00071 {
00072     uint8_t *sector= p->buf;
00073     uint8_t *end= sector + p->buf_size;
00074     int aud=0, vid=0;
00075 
00076     if (p->buf_size < RAW_CD_SECTOR_SIZE)
00077         return 0;
00078 
00079     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
00080         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
00081 
00082         /* RIFF header seen; skip 0x2C bytes */
00083         sector += RIFF_HEADER_SIZE;
00084     }
00085 
00086     while (end - sector >= RAW_CD_SECTOR_SIZE) {
00087         /* look for CD sync header (00, 0xFF x 10, 00) */
00088         if (memcmp(sector,sync_header,sizeof(sync_header)))
00089             return 0;
00090 
00091         if (sector[0x11] >= 32)
00092             return 0;
00093 
00094         switch (sector[0x12] & CDXA_TYPE_MASK) {
00095         case CDXA_TYPE_DATA:
00096         case CDXA_TYPE_VIDEO: {
00097                 int current_sector = AV_RL16(&sector[0x1C]);
00098                 int sector_count   = AV_RL16(&sector[0x1E]);
00099                 int frame_size = AV_RL32(&sector[0x24]);
00100 
00101                 if(!(   frame_size>=0
00102                      && current_sector < sector_count
00103                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
00104                     return 0;
00105                 }
00106 
00107                 /*st->codec->width      = AV_RL16(&sector[0x28]);
00108                 st->codec->height     = AV_RL16(&sector[0x2A]);*/
00109 
00110 //                 if (current_sector == sector_count-1) {
00111                     vid++;
00112 //                 }
00113 
00114             }
00115             break;
00116         case CDXA_TYPE_AUDIO:
00117             if(sector[0x13]&0x2A)
00118                 return 0;
00119             aud++;
00120             break;
00121         default:
00122             if(sector[0x12] & CDXA_TYPE_MASK)
00123                 return 0;
00124         }
00125         sector += RAW_CD_SECTOR_SIZE;
00126     }
00127     /* MPEG files (like those ripped from VCDs) can also look like this;
00128      * only return half certainty */
00129     if(vid+aud > 3)  return 50;
00130     else if(vid+aud) return 1;
00131     else             return 0;
00132 }
00133 
00134 static int str_read_header(AVFormatContext *s)
00135 {
00136     AVIOContext *pb = s->pb;
00137     StrDemuxContext *str = s->priv_data;
00138     unsigned char sector[RAW_CD_SECTOR_SIZE];
00139     int start;
00140     int i;
00141 
00142     /* skip over any RIFF header */
00143     if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
00144         return AVERROR(EIO);
00145     if (AV_RL32(&sector[0]) == RIFF_TAG)
00146         start = RIFF_HEADER_SIZE;
00147     else
00148         start = 0;
00149 
00150     avio_seek(pb, start, SEEK_SET);
00151 
00152     for(i=0; i<32; i++){
00153         str->channels[i].video_stream_index=
00154         str->channels[i].audio_stream_index= -1;
00155     }
00156 
00157     s->ctx_flags |= AVFMTCTX_NOHEADER;
00158 
00159     return 0;
00160 }
00161 
00162 static int str_read_packet(AVFormatContext *s,
00163                            AVPacket *ret_pkt)
00164 {
00165     AVIOContext *pb = s->pb;
00166     StrDemuxContext *str = s->priv_data;
00167     unsigned char sector[RAW_CD_SECTOR_SIZE];
00168     int channel;
00169     AVPacket *pkt;
00170     AVStream *st;
00171 
00172     while (1) {
00173 
00174         if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
00175             return AVERROR(EIO);
00176 
00177         channel = sector[0x11];
00178         if (channel >= 32)
00179             return AVERROR_INVALIDDATA;
00180 
00181         switch (sector[0x12] & CDXA_TYPE_MASK) {
00182 
00183         case CDXA_TYPE_DATA:
00184         case CDXA_TYPE_VIDEO:
00185             {
00186 
00187                 int current_sector = AV_RL16(&sector[0x1C]);
00188                 int sector_count   = AV_RL16(&sector[0x1E]);
00189                 int frame_size = AV_RL32(&sector[0x24]);
00190 
00191                 if(!(   frame_size>=0
00192                      && current_sector < sector_count
00193                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
00194                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
00195                     break;
00196                 }
00197 
00198                 if(str->channels[channel].video_stream_index < 0){
00199                     /* allocate a new AVStream */
00200                     st = avformat_new_stream(s, NULL);
00201                     if (!st)
00202                         return AVERROR(ENOMEM);
00203                     avpriv_set_pts_info(st, 64, 1, 15);
00204 
00205                     str->channels[channel].video_stream_index = st->index;
00206 
00207                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00208                     st->codec->codec_id   = AV_CODEC_ID_MDEC;
00209                     st->codec->codec_tag  = 0;  /* no fourcc */
00210                     st->codec->width      = AV_RL16(&sector[0x28]);
00211                     st->codec->height     = AV_RL16(&sector[0x2A]);
00212                 }
00213 
00214                 /* if this is the first sector of the frame, allocate a pkt */
00215                 pkt = &str->channels[channel].tmp_pkt;
00216 
00217                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
00218                     if(pkt->data)
00219                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
00220                     av_free_packet(pkt);
00221                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
00222                         return AVERROR(EIO);
00223 
00224                     pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
00225                     pkt->stream_index =
00226                         str->channels[channel].video_stream_index;
00227                 }
00228 
00229                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
00230                        sector + VIDEO_DATA_HEADER_SIZE,
00231                        VIDEO_DATA_CHUNK_SIZE);
00232 
00233                 if (current_sector == sector_count-1) {
00234                     pkt->size= frame_size;
00235                     *ret_pkt = *pkt;
00236                     pkt->data= NULL;
00237                     pkt->size= -1;
00238                     return 0;
00239                 }
00240 
00241             }
00242             break;
00243 
00244         case CDXA_TYPE_AUDIO:
00245             if(str->channels[channel].audio_stream_index < 0){
00246                 int fmt = sector[0x13];
00247                 /* allocate a new AVStream */
00248                 st = avformat_new_stream(s, NULL);
00249                 if (!st)
00250                     return AVERROR(ENOMEM);
00251 
00252                 str->channels[channel].audio_stream_index = st->index;
00253 
00254                 st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
00255                 st->codec->codec_id    = AV_CODEC_ID_ADPCM_XA;
00256                 st->codec->codec_tag   = 0;  /* no fourcc */
00257                 if (fmt & 1) {
00258                     st->codec->channels       = 2;
00259                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
00260                 } else {
00261                     st->codec->channels       = 1;
00262                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
00263                 }
00264                 st->codec->sample_rate = (fmt&4)?18900:37800;
00265             //    st->codec->bit_rate = 0; //FIXME;
00266                 st->codec->block_align = 128;
00267 
00268                 avpriv_set_pts_info(st, 64, 18 * 224 / st->codec->channels,
00269                                     st->codec->sample_rate);
00270                 st->start_time = 0;
00271             }
00272             pkt = ret_pkt;
00273             if (av_new_packet(pkt, 2304))
00274                 return AVERROR(EIO);
00275             memcpy(pkt->data,sector+24,2304);
00276 
00277             pkt->stream_index =
00278                 str->channels[channel].audio_stream_index;
00279             pkt->duration = 1;
00280             return 0;
00281         default:
00282             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
00283             /* drop the sector and move on */
00284             break;
00285         }
00286 
00287         if (url_feof(pb))
00288             return AVERROR(EIO);
00289     }
00290 }
00291 
00292 static int str_read_close(AVFormatContext *s)
00293 {
00294     StrDemuxContext *str = s->priv_data;
00295     int i;
00296     for(i=0; i<32; i++){
00297         if(str->channels[i].tmp_pkt.data)
00298             av_free_packet(&str->channels[i].tmp_pkt);
00299     }
00300 
00301     return 0;
00302 }
00303 
00304 AVInputFormat ff_str_demuxer = {
00305     .name           = "psxstr",
00306     .long_name      = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
00307     .priv_data_size = sizeof(StrDemuxContext),
00308     .read_probe     = str_probe,
00309     .read_header    = str_read_header,
00310     .read_packet    = str_read_packet,
00311     .read_close     = str_read_close,
00312     .flags          = AVFMT_NO_BYTE_SEEK,
00313 };