psxstr.c 8.26 KB
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/*
 * Sony Playstation (PSX) STR File Demuxer
 * Copyright (c) 2003 The ffmpeg Project
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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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 */

/**
 * @file psxstr.c
 * 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.
 */

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#include "libavutil/intreadwrite.h"
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#include "avformat.h"

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#define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
#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
#define VIDEO_DATA_HEADER_SIZE  0x38
#define RIFF_HEADER_SIZE        0x2C
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#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;
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    AVPacket tmp_pkt;
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    /* 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;

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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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    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) &&
        (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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    /* 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)
        return 0;
    if(   (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_VIDEO
       && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_AUDIO
       && (sector[0x12] & CDXA_TYPE_MASK) != CDXA_TYPE_DATA)
        return 0;

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    /* MPEG files (like those ripped from VCDs) can also look like this;
     * only return half certainty */
    return 50;
}

static int str_read_header(AVFormatContext *s,
                           AVFormatParameters *ap)
{
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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];
    int start;
    int i;

    /* skip over any RIFF header */
    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;
    else
        start = 0;

    url_fseek(pb, start, SEEK_SET);

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

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    s->ctx_flags |= AVFMTCTX_NOHEADER;
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    return 0;
}

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];
    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];
        if (channel >= 32)
            return AVERROR_INVALIDDATA;

        switch (sector[0x12] & CDXA_TYPE_MASK) {

        case CDXA_TYPE_DATA:
        case CDXA_TYPE_VIDEO:
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            {
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                int current_sector = AV_RL16(&sector[0x1C]);
                int sector_count   = AV_RL16(&sector[0x1E]);
                int frame_size = AV_RL32(&sector[0x24]);
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                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);
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                    break;
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                }

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                if(str->channels[channel].video_stream_index < 0){
                    /* allocate a new AVStream */
                    st = av_new_stream(s, 0);
                    if (!st)
                        return AVERROR(ENOMEM);
                    av_set_pts_info(st, 64, 1, 15);

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

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

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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){
                    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))
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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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                memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
                       sector + VIDEO_DATA_HEADER_SIZE,
                       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;
                    pkt->size= -1;
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                    return 0;
                }
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            }
            break;

        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 */
                st = av_new_stream(s, 0);
                if (!st)
                    return AVERROR(ENOMEM);

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

                st->codec->codec_type  = CODEC_TYPE_AUDIO;
                st->codec->codec_id    = CODEC_ID_ADPCM_XA;
                st->codec->codec_tag   = 0;  /* no fourcc */
                st->codec->channels    = (fmt&1)?2:1;
                st->codec->sample_rate = (fmt&4)?18900:37800;
            //    st->codec->bit_rate = 0; //FIXME;
                st->codec->block_align = 128;

                av_set_pts_info(st, 64, 128, st->codec->sample_rate);
            }
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            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;
            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 */
            break;
        }

        if (url_feof(pb))
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            return AVERROR(EIO);
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    }
}

static int str_read_close(AVFormatContext *s)
{
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    StrDemuxContext *str = s->priv_data;
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    int i;
    for(i=0; i<32; i++){
        if(str->channels[i].tmp_pkt.data)
            av_free_packet(&str->channels[i].tmp_pkt);
    }
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    return 0;
}

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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),
    str_probe,
    str_read_header,
    str_read_packet,
    str_read_close,
};