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ffmpeg / libavformat / psxstr.c @ 470bce2b

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