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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 LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
(((uint8_t*)(x))[2] << 16) | \
(((uint8_t*)(x))[1] << 8) | \
((uint8_t*)(x))[0])
#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
( (long)(unsigned char)(ch0) | \
( (long)(unsigned char)(ch1) << 8 ) | \
( (long)(unsigned char)(ch2) << 16 ) | \
( (long)(unsigned char)(ch3) << 24 ) )
#define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
#define CDXA_TAG FOURCC_TAG('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;
} StrDemuxContext;
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 ((p->buf[start + 0] != 0x00) || (p->buf[start + 1] != 0xFF) ||
(p->buf[start + 2] != 0xFF) || (p->buf[start + 3] != 0xFF) ||
(p->buf[start + 4] != 0xFF) || (p->buf[start + 5] != 0xFF) ||
(p->buf[start + 6] != 0xFF) || (p->buf[start + 7] != 0xFF) ||
(p->buf[start + 8] != 0xFF) || (p->buf[start + 9] != 0xFF) ||
(p->buf[start + 10] != 0xFF) || (p->buf[start + 11] != 0x00))
return 0;
/* 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)
{
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;
/* set the pts reference (1 pts = 1/90000) */
s->pts_num = 1;
s->pts_den = 90000;
/* 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;
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;
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) {
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;
}
break;
default:
/* ignore */
break;
}
}
if (str->video_channel != -1)
printf (" video channel = %d, %d x %d\n", str->video_channel,
str->channels[str->video_channel].width,
str->channels[str->video_channel].height);
if (str->audio_channel != -1)
printf (" audio channel = %d, %d Hz, %d channels, %d bits/sample\n",
str->video_channel,
str->channels[str->video_channel].sample_rate,
str->channels[str->video_channel].channels,
str->channels[str->video_channel].bits);
/* back to the start */
url_fseek(pb, start, SEEK_SET);
return 0;
}
static int str_read_packet(AVFormatContext *s,
AVPacket *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 video_sector_count = 0;
int current_video_sector = 0;
int video_frame_size = 0;
int video_frame_index = 0;
int bytes_to_copy;
int ret = 0;
while (!packet_read) {
if (get_buffer(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
return -EIO;
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) {
/* if this is the first sector of the frame, allocate a pkt */
if (current_video_sector == 0) {
video_frame_size = LE_32(&sector[0x24]);
video_sector_count = LE_16(&sector[0x1E]);
if (av_new_packet(pkt, video_frame_size))
return -EIO;
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 */
if (video_frame_size - video_frame_index < VIDEO_DATA_CHUNK_SIZE)
bytes_to_copy = video_frame_size - video_frame_index;
else
bytes_to_copy = VIDEO_DATA_CHUNK_SIZE;
if (video_frame_index < video_frame_size)
memcpy(&pkt->data[video_frame_index],
&sector[VIDEO_DATA_HEADER_SIZE], bytes_to_copy);
#ifdef PRINTSTUFF
printf (" chunk %d/%d (bytes %d/%d), first 6 bytes = %02X %02X %02X %02X %02X %02X\n",
current_video_sector, video_sector_count,
video_frame_index, video_frame_size,
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 0],
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 1],
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 2],
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 3],
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 4],
pkt->data[current_video_sector * VIDEO_DATA_CHUNK_SIZE + 5]);
#endif
video_frame_index += bytes_to_copy;
/* must keep reading sectors until all current video sectors
* are consumed */
current_video_sector++;
if (current_video_sector >= video_sector_count)
packet_read = 1;
}
break;
case CDXA_TYPE_AUDIO:
#ifdef PRINTSTUFF
printf (" dropping audio sector\n");
#endif
break;
default:
/* drop the sector and move on */
#ifdef PRINTSTUFF
printf (" dropping other sector\n");
#endif
break;
}
if (url_feof(pb))
return -EIO;
}
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;
}