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ffmpeg / libavformat / psxstr.c @ d2062ff6

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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 PRINTSTUFF
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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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    int type;
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#define STR_AUDIO 0
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#define STR_VIDEO 1
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    /* video parameters */
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    int width;
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    int height;
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    int video_stream_index;
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    /* audio parameters */
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    int sample_rate;
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    int channels;
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    int bits;
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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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    /* only decode the first audio and video channels encountered */
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    int video_channel;
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    int audio_channel;
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    int64_t pts;
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    unsigned char *video_chunk;
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    AVPacket tmp_pkt;
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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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    int start;
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    /* need at least 0x38 bytes to validate */
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    if (p->buf_size < 0x38)
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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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        start = RIFF_HEADER_SIZE;
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    } else
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        start = 0;
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    /* look for CD sync header (00, 0xFF x 10, 00) */
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    if (memcmp(p->buf+start,sync_header,sizeof(sync_header)))
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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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#if 0
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static void dump(unsigned char *buf,size_t len)
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{
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    int i;
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    for(i=0;i<len;i++) {
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        if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x  ",i);
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        av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
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        if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
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    }
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    av_log(NULL, AV_LOG_DEBUG, "\n");
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}
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#endif
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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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    AVStream *st;
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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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    int channel;
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    /* initialize context members */
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    str->pts = 0;
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    str->audio_channel = -1;  /* assume to audio or video */
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    str->video_channel = -1;
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    str->video_chunk = NULL;
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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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    /* check through the first 32 sectors for individual channels */
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    for (i = 0; i < 32; i++) {
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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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//printf("%02x %02x %02x %02x\n",sector[0x10],sector[0x11],sector[0x12],sector[0x13]);
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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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            /* check if this channel gets to be the dominant video channel */
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            if (str->video_channel == -1) {
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                /* qualify the magic number */
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                if (AV_RL32(&sector[0x18]) != STR_MAGIC)
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                    break;
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                str->video_channel = channel;
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                str->channels[channel].type = STR_VIDEO;
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                str->channels[channel].width = AV_RL16(&sector[0x28]);
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                str->channels[channel].height = AV_RL16(&sector[0x2A]);
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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 = str->channels[channel].width;
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                st->codec->height = str->channels[channel].height;
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            }
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            break;
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        case CDXA_TYPE_AUDIO:
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            /* check if this channel gets to be the dominant audio channel */
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            if (str->audio_channel == -1) {
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                int fmt;
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                str->audio_channel = channel;
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                str->channels[channel].type = STR_AUDIO;
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                str->channels[channel].channels =
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                    (sector[0x13] & 0x01) ? 2 : 1;
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                str->channels[channel].sample_rate =
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                    (sector[0x13] & 0x04) ? 18900 : 37800;
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                str->channels[channel].bits =
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                    (sector[0x13] & 0x10) ? 8 : 4;
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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, 128, str->channels[channel].sample_rate);
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                str->channels[channel].audio_stream_index = st->index;
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                fmt = sector[0x13];
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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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            }
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            break;
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        default:
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            /* ignore */
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            break;
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        }
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    }
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if (str->video_channel != -1)
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  av_log (s, AV_LOG_DEBUG, " video channel = %d, %d x %d %d\n", str->video_channel,
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    str->channels[str->video_channel].width,
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    str->channels[str->video_channel].height,str->channels[str->video_channel].video_stream_index);
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if (str->audio_channel != -1)
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   av_log (s, AV_LOG_DEBUG, " audio channel = %d, %d Hz, %d channels, %d bits/sample %d\n",
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    str->audio_channel,
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    str->channels[str->audio_channel].sample_rate,
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    str->channels[str->audio_channel].channels,
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    str->channels[str->audio_channel].bits,str->channels[str->audio_channel].audio_stream_index);
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    /* back to the start */
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    url_fseek(pb, start, SEEK_SET);
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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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    int packet_read = 0;
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    int ret = 0;
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    AVPacket *pkt;
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    while (!packet_read) {
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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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            /* check if this the video channel we care about */
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            if (channel == str->video_channel) {
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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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                int bytes_to_copy;
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//        printf("%d %d %d\n",current_sector,sector_count,frame_size);
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                /* if this is the first sector of the frame, allocate a pkt */
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                pkt = &str->tmp_pkt;
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                if (current_sector == 0) {
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                    if (av_new_packet(pkt, frame_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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               //     pkt->pts = str->pts;
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                    /* if there is no audio, adjust the pts after every video
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                     * frame; assume 15 fps */
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                   if (str->audio_channel != -1)
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                       str->pts += (90000 / 15);
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                }
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                /* load all the constituent chunks in the video packet */
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                bytes_to_copy = frame_size - current_sector*VIDEO_DATA_CHUNK_SIZE;
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                if (bytes_to_copy>0) {
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                    if (bytes_to_copy>VIDEO_DATA_CHUNK_SIZE) bytes_to_copy=VIDEO_DATA_CHUNK_SIZE;
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                    memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
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                        sector + VIDEO_DATA_HEADER_SIZE, bytes_to_copy);
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                }
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                if (current_sector == sector_count-1) {
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                    *ret_pkt = *pkt;
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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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#ifdef PRINTSTUFF
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printf (" dropping audio sector\n");
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#endif
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#if 1
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            /* check if this the video channel we care about */
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            if (channel == str->audio_channel) {
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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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                //pkt->pts = str->pts;
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                return 0;
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            }
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#endif
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            break;
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        default:
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            /* drop the sector and move on */
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#ifdef PRINTSTUFF
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printf (" dropping other sector\n");
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#endif
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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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    return ret;
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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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    av_free(str->video_chunk);
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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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    "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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};