/*
  * Sony Playstation (PSX) STR File Demuxer
  * Copyright (c) 2003 The ffmpeg Project
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */
 
 /**

  * @file

  * PSX STR file demuxer
  * by Mike Melanson (melanson@pcisys.net)
  * This module handles streams that have been ripped from Sony Playstation
  * CD games. This demuxer can handle either raw STR files (which are just
  * concatenations of raw compact disc sectors) or STR files with 0x2C-byte
  * RIFF headers, followed by CD sectors.
  */
 

 #include "libavutil/channel_layout.h"

 #include "libavutil/internal.h"

 #include "libavutil/intreadwrite.h"

 #include "avformat.h"

 #include "internal.h"

 #define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
 #define CDXA_TAG MKTAG('C', 'D', 'X', 'A')

 #define RAW_CD_SECTOR_SIZE      2352

 #define RAW_CD_SECTOR_DATA_SIZE 2304

 #define VIDEO_DATA_CHUNK_SIZE   0x7E0
 #define VIDEO_DATA_HEADER_SIZE  0x38
 #define RIFF_HEADER_SIZE        0x2C

 
 #define CDXA_TYPE_MASK     0x0E
 #define CDXA_TYPE_DATA     0x08
 #define CDXA_TYPE_AUDIO    0x04
 #define CDXA_TYPE_VIDEO    0x02
 
 #define STR_MAGIC (0x80010160)
 
 typedef struct StrChannel {
     /* video parameters */
     int video_stream_index;

     AVPacket tmp_pkt;

 
     /* audio parameters */
     int audio_stream_index;
 } StrChannel;
 
 typedef struct StrDemuxContext {
 
     /* a STR file can contain up to 32 channels of data */
     StrChannel channels[32];
 } StrDemuxContext;
 

 static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};

 static int str_probe(AVProbeData *p)
 {

     const uint8_t *sector= p->buf;
     const uint8_t *end= sector + p->buf_size;

     int aud=0, vid=0;

     if (p->buf_size < RAW_CD_SECTOR_SIZE)

         return 0;
 

     if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
         (AV_RL32(&p->buf[8]) == CDXA_TAG)) {

 
         /* RIFF header seen; skip 0x2C bytes */

         sector += RIFF_HEADER_SIZE;
     }

     while (end - sector >= RAW_CD_SECTOR_SIZE) {
         /* look for CD sync header (00, 0xFF x 10, 00) */
         if (memcmp(sector,sync_header,sizeof(sync_header)))
             return 0;
 
         if (sector[0x11] >= 32)
             return 0;
 
         switch (sector[0x12] & CDXA_TYPE_MASK) {
         case CDXA_TYPE_DATA:
         case CDXA_TYPE_VIDEO: {
                 int current_sector = AV_RL16(&sector[0x1C]);
                 int sector_count   = AV_RL16(&sector[0x1E]);
                 int frame_size = AV_RL32(&sector[0x24]);
 
                 if(!(   frame_size>=0
                      && current_sector < sector_count
                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
                     return 0;
                 }
 
                 /*st->codec->width      = AV_RL16(&sector[0x28]);
                 st->codec->height     = AV_RL16(&sector[0x2A]);*/
 
 //                 if (current_sector == sector_count-1) {
                     vid++;
 //                 }
 
             }
             break;
         case CDXA_TYPE_AUDIO:
             if(sector[0x13]&0x2A)
                 return 0;
             aud++;
             break;
         default:
             if(sector[0x12] & CDXA_TYPE_MASK)
                 return 0;
         }
         sector += RAW_CD_SECTOR_SIZE;
     }

     /* MPEG files (like those ripped from VCDs) can also look like this;
      * only return half certainty */

     if(vid+aud > 3)  return AVPROBE_SCORE_EXTENSION;

     else if(vid+aud) return 1;
     else             return 0;

 }
 

 static int str_read_header(AVFormatContext *s)

 {

     AVIOContext *pb = s->pb;

     StrDemuxContext *str = s->priv_data;

     unsigned char sector[RAW_CD_SECTOR_SIZE];
     int start;
     int i;
 
     /* skip over any RIFF header */

     if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)

         return AVERROR(EIO);

     if (AV_RL32(&sector[0]) == RIFF_TAG)

         start = RIFF_HEADER_SIZE;
     else
         start = 0;
 

     avio_seek(pb, start, SEEK_SET);

     for(i=0; i<32; i++){
         str->channels[i].video_stream_index=
         str->channels[i].audio_stream_index= -1;
     }
 

     s->ctx_flags |= AVFMTCTX_NOHEADER;

 
     return 0;
 }
 
 static int str_read_packet(AVFormatContext *s,

                            AVPacket *ret_pkt)

 {

     AVIOContext *pb = s->pb;

     StrDemuxContext *str = s->priv_data;

     unsigned char sector[RAW_CD_SECTOR_SIZE];
     int channel;

     AVPacket *pkt;

     AVStream *st;

     while (1) {

         if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)

             return AVERROR(EIO);

 
         channel = sector[0x11];
         if (channel >= 32)
             return AVERROR_INVALIDDATA;
 
         switch (sector[0x12] & CDXA_TYPE_MASK) {
 
         case CDXA_TYPE_DATA:
         case CDXA_TYPE_VIDEO:

             {

                 int current_sector = AV_RL16(&sector[0x1C]);
                 int sector_count   = AV_RL16(&sector[0x1E]);
                 int frame_size = AV_RL32(&sector[0x24]);

 
                 if(!(   frame_size>=0
                      && current_sector < sector_count
                      && sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
                     av_log(s, AV_LOG_ERROR, "Invalid parameters %d %d %d\n", current_sector, sector_count, frame_size);

                     break;

                 }
 

                 if(str->channels[channel].video_stream_index < 0){
                     /* allocate a new AVStream */

                     st = avformat_new_stream(s, NULL);

                     if (!st)
                         return AVERROR(ENOMEM);

                     avpriv_set_pts_info(st, 64, 1, 15);

 
                     str->channels[channel].video_stream_index = st->index;
 

                     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

                     st->codec->codec_id   = AV_CODEC_ID_MDEC;

                     st->codec->codec_tag  = 0;  /* no fourcc */
                     st->codec->width      = AV_RL16(&sector[0x28]);
                     st->codec->height     = AV_RL16(&sector[0x2A]);
                 }
 

                 /* if this is the first sector of the frame, allocate a pkt */

                 pkt = &str->channels[channel].tmp_pkt;

 
                 if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
                     if(pkt->data)
                         av_log(s, AV_LOG_ERROR, "missmatching sector_count\n");
                     av_free_packet(pkt);
                     if (av_new_packet(pkt, sector_count*VIDEO_DATA_CHUNK_SIZE))

                         return AVERROR(EIO);

                     memset(pkt->data, 0, sector_count*VIDEO_DATA_CHUNK_SIZE);

                     pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;

                     pkt->stream_index =

                         str->channels[channel].video_stream_index;
                 }
 

                 memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
                        sector + VIDEO_DATA_HEADER_SIZE,
                        VIDEO_DATA_CHUNK_SIZE);
 

                 if (current_sector == sector_count-1) {

                     pkt->size= frame_size;

                     *ret_pkt = *pkt;

                     pkt->data= NULL;
                     pkt->size= -1;

                     pkt->buf = NULL;
 #if FF_API_DESTRUCT_PACKET

 FF_DISABLE_DEPRECATION_WARNINGS

                     pkt->destruct = NULL;

 FF_ENABLE_DEPRECATION_WARNINGS

 #endif

                     return 0;
                 }

 
             }
             break;
 
         case CDXA_TYPE_AUDIO:

             if(str->channels[channel].audio_stream_index < 0){

                 int fmt = sector[0x13];

                 /* allocate a new AVStream */

                 st = avformat_new_stream(s, NULL);

                 if (!st)
                     return AVERROR(ENOMEM);
 
                 str->channels[channel].audio_stream_index = st->index;
 

                 st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;

                 st->codec->codec_id    = AV_CODEC_ID_ADPCM_XA;

                 st->codec->codec_tag   = 0;  /* no fourcc */

                 if (fmt & 1) {
                     st->codec->channels       = 2;
                     st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
                 } else {
                     st->codec->channels       = 1;
                     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
                 }

                 st->codec->sample_rate = (fmt&4)?18900:37800;
             //    st->codec->bit_rate = 0; //FIXME;
                 st->codec->block_align = 128;
 

                 avpriv_set_pts_info(st, 64, 18 * 224 / st->codec->channels,
                                     st->codec->sample_rate);
                 st->start_time = 0;

             }

             pkt = ret_pkt;
             if (av_new_packet(pkt, 2304))
                 return AVERROR(EIO);
             memcpy(pkt->data,sector+24,2304);
 
             pkt->stream_index =
                 str->channels[channel].audio_stream_index;

             pkt->duration = 1;

             return 0;

         default:

             av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);

             /* drop the sector and move on */
             break;
         }
 
         if (url_feof(pb))

             return AVERROR(EIO);

     }
 }
 
 static int str_read_close(AVFormatContext *s)
 {

     StrDemuxContext *str = s->priv_data;

     int i;
     for(i=0; i<32; i++){
         if(str->channels[i].tmp_pkt.data)
             av_free_packet(&str->channels[i].tmp_pkt);
     }

 
     return 0;
 }
 

 AVInputFormat ff_str_demuxer = {

     .name           = "psxstr",

     .long_name      = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),

     .priv_data_size = sizeof(StrDemuxContext),
     .read_probe     = str_probe,
     .read_header    = str_read_header,
     .read_packet    = str_read_packet,
     .read_close     = str_read_close,

     .flags          = AVFMT_NO_BYTE_SEEK,

 };