yading@11: /*
yading@11:  * Sony Playstation (PSX) STR File Demuxer
yading@11:  * Copyright (c) 2003 The ffmpeg Project
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * PSX STR file demuxer
yading@11:  * by Mike Melanson (melanson@pcisys.net)
yading@11:  * This module handles streams that have been ripped from Sony Playstation
yading@11:  * CD games. This demuxer can handle either raw STR files (which are just
yading@11:  * concatenations of raw compact disc sectors) or STR files with 0x2C-byte
yading@11:  * RIFF headers, followed by CD sectors.
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
yading@11: #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')
yading@11: 
yading@11: #define RAW_CD_SECTOR_SIZE      2352
yading@11: #define RAW_CD_SECTOR_DATA_SIZE 2304
yading@11: #define VIDEO_DATA_CHUNK_SIZE   0x7E0
yading@11: #define VIDEO_DATA_HEADER_SIZE  0x38
yading@11: #define RIFF_HEADER_SIZE        0x2C
yading@11: 
yading@11: #define CDXA_TYPE_MASK     0x0E
yading@11: #define CDXA_TYPE_DATA     0x08
yading@11: #define CDXA_TYPE_AUDIO    0x04
yading@11: #define CDXA_TYPE_VIDEO    0x02
yading@11: 
yading@11: #define STR_MAGIC (0x80010160)
yading@11: 
yading@11: typedef struct StrChannel {
yading@11:     /* video parameters */
yading@11:     int video_stream_index;
yading@11:     AVPacket tmp_pkt;
yading@11: 
yading@11:     /* audio parameters */
yading@11:     int audio_stream_index;
yading@11: } StrChannel;
yading@11: 
yading@11: typedef struct StrDemuxContext {
yading@11: 
yading@11:     /* a STR file can contain up to 32 channels of data */
yading@11:     StrChannel channels[32];
yading@11: } StrDemuxContext;
yading@11: 
yading@11: static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
yading@11: 
yading@11: static int str_probe(AVProbeData *p)
yading@11: {
yading@11:     const uint8_t *sector= p->buf;
yading@11:     const uint8_t *end= sector + p->buf_size;
yading@11:     int aud=0, vid=0;
yading@11: 
yading@11:     if (p->buf_size < RAW_CD_SECTOR_SIZE)
yading@11:         return 0;
yading@11: 
yading@11:     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
yading@11:         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {
yading@11: 
yading@11:         /* RIFF header seen; skip 0x2C bytes */
yading@11:         sector += RIFF_HEADER_SIZE;
yading@11:     }
yading@11: 
yading@11:     while (end - sector >= RAW_CD_SECTOR_SIZE) {
yading@11:         /* look for CD sync header (00, 0xFF x 10, 00) */
yading@11:         if (memcmp(sector,sync_header,sizeof(sync_header)))
yading@11:             return 0;
yading@11: 
yading@11:         if (sector[0x11] >= 32)
yading@11:             return 0;
yading@11: 
yading@11:         switch (sector[0x12] & CDXA_TYPE_MASK) {
yading@11:         case CDXA_TYPE_DATA:
yading@11:         case CDXA_TYPE_VIDEO: {
yading@11:                 int current_sector = AV_RL16(&sector[0x1C]);
yading@11:                 int sector_count   = AV_RL16(&sector[0x1E]);
yading@11:                 int frame_size = AV_RL32(&sector[0x24]);
yading@11: 
yading@11:                 if(!(   frame_size>=0
yading@11:                      && current_sector < sector_count
yading@11:                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
yading@11:                     return 0;
yading@11:                 }
yading@11: 
yading@11:                 /*st->codec->width      = AV_RL16(&sector[0x28]);
yading@11:                 st->codec->height     = AV_RL16(&sector[0x2A]);*/
yading@11: 
yading@11: //                 if (current_sector == sector_count-1) {
yading@11:                     vid++;
yading@11: //                 }
yading@11: 
yading@11:             }
yading@11:             break;
yading@11:         case CDXA_TYPE_AUDIO:
yading@11:             if(sector[0x13]&0x2A)
yading@11:                 return 0;
yading@11:             aud++;
yading@11:             break;
yading@11:         default:
yading@11:             if(sector[0x12] & CDXA_TYPE_MASK)
yading@11:                 return 0;
yading@11:         }
yading@11:         sector += RAW_CD_SECTOR_SIZE;
yading@11:     }
yading@11:     /* MPEG files (like those ripped from VCDs) can also look like this;
yading@11:      * only return half certainty */
yading@11:     if(vid+aud > 3)  return 50;
yading@11:     else if(vid+aud) return 1;
yading@11:     else             return 0;
yading@11: }
yading@11: 
yading@11: static int str_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     StrDemuxContext *str = s->priv_data;
yading@11:     unsigned char sector[RAW_CD_SECTOR_SIZE];
yading@11:     int start;
yading@11:     int i;
yading@11: 
yading@11:     /* skip over any RIFF header */
yading@11:     if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
yading@11:         return AVERROR(EIO);
yading@11:     if (AV_RL32(&sector[0]) == RIFF_TAG)
yading@11:         start = RIFF_HEADER_SIZE;
yading@11:     else
yading@11:         start = 0;
yading@11: 
yading@11:     avio_seek(pb, start, SEEK_SET);
yading@11: 
yading@11:     for(i=0; i<32; i++){
yading@11:         str->channels[i].video_stream_index=
yading@11:         str->channels[i].audio_stream_index= -1;
yading@11:     }
yading@11: 
yading@11:     s->ctx_flags |= AVFMTCTX_NOHEADER;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int str_read_packet(AVFormatContext *s,
yading@11:                            AVPacket *ret_pkt)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     StrDemuxContext *str = s->priv_data;
yading@11:     unsigned char sector[RAW_CD_SECTOR_SIZE];
yading@11:     int channel;
yading@11:     AVPacket *pkt;
yading@11:     AVStream *st;
yading@11: 
yading@11:     while (1) {
yading@11: 
yading@11:         if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         channel = sector[0x11];
yading@11:         if (channel >= 32)
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         switch (sector[0x12] & CDXA_TYPE_MASK) {
yading@11: 
yading@11:         case CDXA_TYPE_DATA:
yading@11:         case CDXA_TYPE_VIDEO:
yading@11:             {
yading@11: 
yading@11:                 int current_sector = AV_RL16(&sector[0x1C]);
yading@11:                 int sector_count   = AV_RL16(&sector[0x1E]);
yading@11:                 int frame_size = AV_RL32(&sector[0x24]);
yading@11: 
yading@11:                 if(!(   frame_size>=0
yading@11:                      && current_sector < sector_count
yading@11:                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
yading@11:                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);
yading@11:                     break;
yading@11:                 }
yading@11: 
yading@11:                 if(str->channels[channel].video_stream_index < 0){
yading@11:                     /* allocate a new AVStream */
yading@11:                     st = avformat_new_stream(s, NULL);
yading@11:                     if (!st)
yading@11:                         return AVERROR(ENOMEM);
yading@11:                     avpriv_set_pts_info(st, 64, 1, 15);
yading@11: 
yading@11:                     str->channels[channel].video_stream_index = st->index;
yading@11: 
yading@11:                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                     st->codec->codec_id   = AV_CODEC_ID_MDEC;
yading@11:                     st->codec->codec_tag  = 0;  /* no fourcc */
yading@11:                     st->codec->width      = AV_RL16(&sector[0x28]);
yading@11:                     st->codec->height     = AV_RL16(&sector[0x2A]);
yading@11:                 }
yading@11: 
yading@11:                 /* if this is the first sector of the frame, allocate a pkt */
yading@11:                 pkt = &str->channels[channel].tmp_pkt;
yading@11: 
yading@11:                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
yading@11:                     if(pkt->data)
yading@11:                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
yading@11:                     av_free_packet(pkt);
yading@11:                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))
yading@11:                         return AVERROR(EIO);
yading@11: 
yading@11:                     pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
yading@11:                     pkt->stream_index =
yading@11:                         str->channels[channel].video_stream_index;
yading@11:                 }
yading@11: 
yading@11:                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
yading@11:                        sector + VIDEO_DATA_HEADER_SIZE,
yading@11:                        VIDEO_DATA_CHUNK_SIZE);
yading@11: 
yading@11:                 if (current_sector == sector_count-1) {
yading@11:                     pkt->size= frame_size;
yading@11:                     *ret_pkt = *pkt;
yading@11:                     pkt->data= NULL;
yading@11:                     pkt->size= -1;
yading@11:                     pkt->buf = NULL;
yading@11: #if FF_API_DESTRUCT_PACKET
yading@11:                     pkt->destruct = NULL;
yading@11: #endif
yading@11:                     return 0;
yading@11:                 }
yading@11: 
yading@11:             }
yading@11:             break;
yading@11: 
yading@11:         case CDXA_TYPE_AUDIO:
yading@11:             if(str->channels[channel].audio_stream_index < 0){
yading@11:                 int fmt = sector[0x13];
yading@11:                 /* allocate a new AVStream */
yading@11:                 st = avformat_new_stream(s, NULL);
yading@11:                 if (!st)
yading@11:                     return AVERROR(ENOMEM);
yading@11: 
yading@11:                 str->channels[channel].audio_stream_index = st->index;
yading@11: 
yading@11:                 st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:                 st->codec->codec_id    = AV_CODEC_ID_ADPCM_XA;
yading@11:                 st->codec->codec_tag   = 0;  /* no fourcc */
yading@11:                 if (fmt & 1) {
yading@11:                     st->codec->channels       = 2;
yading@11:                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:                 } else {
yading@11:                     st->codec->channels       = 1;
yading@11:                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:                 }
yading@11:                 st->codec->sample_rate = (fmt&4)?18900:37800;
yading@11:             //    st->codec->bit_rate = 0; //FIXME;
yading@11:                 st->codec->block_align = 128;
yading@11: 
yading@11:                 avpriv_set_pts_info(st, 64, 18 * 224 / st->codec->channels,
yading@11:                                     st->codec->sample_rate);
yading@11:                 st->start_time = 0;
yading@11:             }
yading@11:             pkt = ret_pkt;
yading@11:             if (av_new_packet(pkt, 2304))
yading@11:                 return AVERROR(EIO);
yading@11:             memcpy(pkt->data,sector+24,2304);
yading@11: 
yading@11:             pkt->stream_index =
yading@11:                 str->channels[channel].audio_stream_index;
yading@11:             pkt->duration = 1;
yading@11:             return 0;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
yading@11:             /* drop the sector and move on */
yading@11:             break;
yading@11:         }
yading@11: 
yading@11:         if (url_feof(pb))
yading@11:             return AVERROR(EIO);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int str_read_close(AVFormatContext *s)
yading@11: {
yading@11:     StrDemuxContext *str = s->priv_data;
yading@11:     int i;
yading@11:     for(i=0; i<32; i++){
yading@11:         if(str->channels[i].tmp_pkt.data)
yading@11:             av_free_packet(&str->channels[i].tmp_pkt);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_str_demuxer = {
yading@11:     .name           = "psxstr",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
yading@11:     .priv_data_size = sizeof(StrDemuxContext),
yading@11:     .read_probe     = str_probe,
yading@11:     .read_header    = str_read_header,
yading@11:     .read_packet    = str_read_packet,
yading@11:     .read_close     = str_read_close,
yading@11:     .flags          = AVFMT_NO_BYTE_SEEK,
yading@11: };