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ffmpeg/libavformat/psxstr.c

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/*
* Sony Playstation (PSX) STR File Demuxer
* Copyright (c) 2003 The ffmpeg Project
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @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.
*/
#include "avformat.h"
//#define PRINTSTUFF
#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 {
int type;
#define STR_AUDIO 0
#define STR_VIDEO 1
/* video parameters */
int width;
int height;
int video_stream_index;
/* audio parameters */
int sample_rate;
int channels;
int bits;
int audio_stream_index;
} StrChannel;
typedef struct StrDemuxContext {
/* a STR file can contain up to 32 channels of data */
StrChannel channels[32];
/* only decode the first audio and video channels encountered */
int video_channel;
int audio_channel;
int64_t pts;
unsigned char *video_chunk;
AVPacket tmp_pkt;
} StrDemuxContext;
const static char sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
static int str_probe(AVProbeData *p)
{
int start;
/* need at least 0x38 bytes to validate */
if (p->buf_size < 0x38)
return 0;
if ((LE_32(&p->buf[0]) == RIFF_TAG) &&
(LE_32(&p->buf[8]) == CDXA_TAG)) {
/* RIFF header seen; skip 0x2C bytes */
start = RIFF_HEADER_SIZE;
} else
start = 0;
/* look for CD sync header (00, 0xFF x 10, 00) */
if (memcmp(p->buf+start,sync_header,sizeof(sync_header)))
return 0;
/* MPEG files (like those ripped from VCDs) can also look like this;
* only return half certainty */
return 50;
}
#if 0
static void dump(unsigned char *buf,size_t len)
{
int i;
for(i=0;i<len;i++) {
if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
}
av_log(NULL, AV_LOG_DEBUG, "\n");
}
#endif
static int str_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
ByteIOContext *pb = &s->pb;
StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
AVStream *st;
unsigned char sector[RAW_CD_SECTOR_SIZE];
int start;
int i;
int channel;
/* initialize context members */
str->pts = 0;
str->audio_channel = -1; /* assume to audio or video */
str->video_channel = -1;
str->video_chunk = NULL;
/* skip over any RIFF header */
if (get_buffer(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
return AVERROR_IO;
if (LE_32(&sector[0]) == RIFF_TAG)
start = RIFF_HEADER_SIZE;
else
start = 0;
url_fseek(pb, start, SEEK_SET);
/* check through the first 32 sectors for individual channels */
for (i = 0; i < 32; i++) {
if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
return AVERROR_IO;
//printf("%02x %02x %02x %02x\n",sector[0x10],sector[0x11],sector[0x12],sector[0x13]);
channel = sector[0x11];
if (channel >= 32)
return AVERROR_INVALIDDATA;
switch (sector[0x12] & CDXA_TYPE_MASK) {
case CDXA_TYPE_DATA:
case CDXA_TYPE_VIDEO:
/* check if this channel gets to be the dominant video channel */
if (str->video_channel == -1) {
/* qualify the magic number */
if (LE_32(&sector[0x18]) != STR_MAGIC)
break;
str->video_channel = channel;
str->channels[channel].type = STR_VIDEO;
str->channels[channel].width = LE_16(&sector[0x28]);
str->channels[channel].height = LE_16(&sector[0x2A]);
/* allocate a new AVStream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
/* set the pts reference (1 pts = 1/90000) */
av_set_pts_info(st, 33, 1, 90000);
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 = str->channels[channel].width;
st->codec.height = str->channels[channel].height;
}
break;
case CDXA_TYPE_AUDIO:
/* check if this channel gets to be the dominant audio channel */
if (str->audio_channel == -1) {
int fmt;
str->audio_channel = channel;
str->channels[channel].type = STR_AUDIO;
str->channels[channel].channels =
(sector[0x13] & 0x01) ? 2 : 1;
str->channels[channel].sample_rate =
(sector[0x13] & 0x04) ? 18900 : 37800;
str->channels[channel].bits =
(sector[0x13] & 0x10) ? 8 : 4;
/* allocate a new AVStream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
av_set_pts_info(st, 33, 1, 90000);
str->channels[channel].audio_stream_index = st->index;
fmt = sector[0x13];
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;
}
break;
default:
/* ignore */
break;
}
}
if (str->video_channel != -1)
av_log (s, AV_LOG_DEBUG, " video channel = %d, %d x %d %d\n", str->video_channel,
str->channels[str->video_channel].width,
str->channels[str->video_channel].height,str->channels[str->video_channel].video_stream_index);
if (str->audio_channel != -1)
av_log (s, AV_LOG_DEBUG, " audio channel = %d, %d Hz, %d channels, %d bits/sample %d\n",
str->audio_channel,
str->channels[str->audio_channel].sample_rate,
str->channels[str->audio_channel].channels,
str->channels[str->audio_channel].bits,str->channels[str->audio_channel].audio_stream_index);
/* back to the start */
url_fseek(pb, start, SEEK_SET);
return 0;
}
static int str_read_packet(AVFormatContext *s,
AVPacket *ret_pkt)
{
ByteIOContext *pb = &s->pb;
StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
unsigned char sector[RAW_CD_SECTOR_SIZE];
int channel;
int packet_read = 0;
int ret = 0;
AVPacket *pkt;
while (!packet_read) {
if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
return AVERROR_IO;
channel = sector[0x11];
if (channel >= 32)
return AVERROR_INVALIDDATA;
switch (sector[0x12] & CDXA_TYPE_MASK) {
case CDXA_TYPE_DATA:
case CDXA_TYPE_VIDEO:
/* check if this the video channel we care about */
if (channel == str->video_channel) {
int current_sector = LE_16(&sector[0x1C]);
int sector_count = LE_16(&sector[0x1E]);
int frame_size = LE_32(&sector[0x24]);
int bytes_to_copy;
// printf("%d %d %d\n",current_sector,sector_count,frame_size);
/* if this is the first sector of the frame, allocate a pkt */
pkt = &str->tmp_pkt;
if (current_sector == 0) {
if (av_new_packet(pkt, frame_size))
return AVERROR_IO;
pkt->pos= url_ftell(pb) - RAW_CD_SECTOR_SIZE;
pkt->stream_index =
str->channels[channel].video_stream_index;
// pkt->pts = str->pts;
/* if there is no audio, adjust the pts after every video
* frame; assume 15 fps */
if (str->audio_channel != -1)
str->pts += (90000 / 15);
}
/* load all the constituent chunks in the video packet */
bytes_to_copy = frame_size - current_sector*VIDEO_DATA_CHUNK_SIZE;
if (bytes_to_copy>0) {
if (bytes_to_copy>VIDEO_DATA_CHUNK_SIZE) bytes_to_copy=VIDEO_DATA_CHUNK_SIZE;
memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
sector + VIDEO_DATA_HEADER_SIZE, bytes_to_copy);
}
if (current_sector == sector_count-1) {
*ret_pkt = *pkt;
return 0;
}
}
break;
case CDXA_TYPE_AUDIO:
#ifdef PRINTSTUFF
printf (" dropping audio sector\n");
#endif
#if 1
/* check if this the video channel we care about */
if (channel == str->audio_channel) {
pkt = ret_pkt;
if (av_new_packet(pkt, 2304))
return AVERROR_IO;
memcpy(pkt->data,sector+24,2304);
pkt->stream_index =
str->channels[channel].audio_stream_index;
//pkt->pts = str->pts;
return 0;
}
#endif
break;
default:
/* drop the sector and move on */
#ifdef PRINTSTUFF
printf (" dropping other sector\n");
#endif
break;
}
if (url_feof(pb))
return AVERROR_IO;
}
return ret;
}
static int str_read_close(AVFormatContext *s)
{
StrDemuxContext *str = (StrDemuxContext *)s->priv_data;
av_free(str->video_chunk);
return 0;
}
static AVInputFormat str_iformat = {
"psxstr",
"Sony Playstation STR format",
sizeof(StrDemuxContext),
str_probe,
str_read_header,
str_read_packet,
str_read_close,
};
int str_init(void)
{
av_register_input_format(&str_iformat);
return 0;
}
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