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353 lines
11 KiB
C
353 lines
11 KiB
C
/*
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
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#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
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(((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
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( (long)(unsigned char)(ch0) | \
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( (long)(unsigned char)(ch1) << 8 ) | \
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( (long)(unsigned char)(ch2) << 16 ) | \
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( (long)(unsigned char)(ch3) << 24 ) )
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#define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
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#define CDXA_TAG FOURCC_TAG('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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} StrDemuxContext;
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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 ((LE_32(&p->buf[0]) == RIFF_TAG) &&
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(LE_32(&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 ((p->buf[start + 0] != 0x00) || (p->buf[start + 1] != 0xFF) ||
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(p->buf[start + 2] != 0xFF) || (p->buf[start + 3] != 0xFF) ||
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(p->buf[start + 4] != 0xFF) || (p->buf[start + 5] != 0xFF) ||
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(p->buf[start + 6] != 0xFF) || (p->buf[start + 7] != 0xFF) ||
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(p->buf[start + 8] != 0xFF) || (p->buf[start + 9] != 0xFF) ||
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(p->buf[start + 10] != 0xFF) || (p->buf[start + 11] != 0x00))
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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 = (StrDemuxContext *)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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/* set the pts reference (1 pts = 1/90000) */
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s->pts_num = 1;
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s->pts_den = 90000;
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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_IO;
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if (LE_32(§or[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_IO;
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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 (LE_32(§or[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 = LE_16(§or[0x28]);
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str->channels[channel].height = LE_16(§or[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_NOMEM;
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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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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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}
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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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printf (" video channel = %d, %d x %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);
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if (str->audio_channel != -1)
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printf (" audio channel = %d, %d Hz, %d channels, %d bits/sample\n",
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str->video_channel,
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str->channels[str->video_channel].sample_rate,
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str->channels[str->video_channel].channels,
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str->channels[str->video_channel].bits);
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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 *pkt)
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{
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ByteIOContext *pb = &s->pb;
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StrDemuxContext *str = (StrDemuxContext *)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 video_sector_count = 0;
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int current_video_sector = 0;
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int video_frame_size = 0;
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int video_frame_index = 0;
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int bytes_to_copy;
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int ret = 0;
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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 -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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/* if this is the first sector of the frame, allocate a pkt */
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if (current_video_sector == 0) {
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video_frame_size = LE_32(§or[0x24]);
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video_sector_count = LE_16(§or[0x1E]);
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if (av_new_packet(pkt, video_frame_size))
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return -EIO;
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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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if (video_frame_size - video_frame_index < VIDEO_DATA_CHUNK_SIZE)
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bytes_to_copy = video_frame_size - video_frame_index;
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else
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bytes_to_copy = VIDEO_DATA_CHUNK_SIZE;
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if (video_frame_index < video_frame_size)
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memcpy(&pkt->data[video_frame_index],
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§or[VIDEO_DATA_HEADER_SIZE], bytes_to_copy);
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#ifdef PRINTSTUFF
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printf (" chunk %d/%d (bytes %d/%d), first 6 bytes = %02X %02X %02X %02X %02X %02X\n",
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current_video_sector, video_sector_count,
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video_frame_index, video_frame_size,
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 0],
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 1],
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 2],
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 3],
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 4],
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pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 5]);
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#endif
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video_frame_index += bytes_to_copy;
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/* must keep reading sectors until all current video sectors
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* are consumed */
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current_video_sector++;
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if (current_video_sector >= video_sector_count)
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packet_read = 1;
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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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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 -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 = (StrDemuxContext *)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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static AVInputFormat str_iformat = {
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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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};
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int str_init(void)
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{
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av_register_input_format(&str_iformat);
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return 0;
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}
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