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FFmpeg/libavformat/psxstr.c
Andreas Rheinhardt bc70684e74 avformat: Constify all muxer/demuxers 
This is possible now that the next-API is gone.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 11:48:06 -03:00

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/*
* Sony Playstation (PSX) STR File Demuxer
* Copyright (c) 2003 The FFmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* 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 "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#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 {
/* video parameters */
int video_stream_index;
AVPacket tmp_pkt;
/* 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;
static const uint8_t sync_header[12] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00};
static int str_probe(const AVProbeData *p)
{
const uint8_t *sector= p->buf;
const uint8_t *end= sector + p->buf_size;
int aud=0, vid=0;
if (p->buf_size < RAW_CD_SECTOR_SIZE)
return 0;
if ((AV_RL32(&p->buf[0]) == RIFF_TAG) &&
(AV_RL32(&p->buf[8]) == CDXA_TAG)) {
/* RIFF header seen; skip 0x2C bytes */
sector += RIFF_HEADER_SIZE;
}
while (end - sector >= RAW_CD_SECTOR_SIZE) {
/* look for CD sync header (00, 0xFF x 10, 00) */
if (memcmp(sector,sync_header,sizeof(sync_header)))
return 0;
if (sector[0x11] >= 32)
return 0;
switch (sector[0x12] & CDXA_TYPE_MASK) {
case CDXA_TYPE_DATA:
case CDXA_TYPE_VIDEO: {
int current_sector = AV_RL16(&sector[0x1C]);
int sector_count = AV_RL16(&sector[0x1E]);
int frame_size = AV_RL32(&sector[0x24]);
if(!( frame_size>=0
&& current_sector < sector_count
&& sector_count*VIDEO_DATA_CHUNK_SIZE >=frame_size)){
return 0;
}
vid++;
}
break;
case CDXA_TYPE_AUDIO:
if(sector[0x13]&0x2A)
return 0;
aud++;
break;
default:
if(sector[0x12] & CDXA_TYPE_MASK)
return 0;
}
sector += RAW_CD_SECTOR_SIZE;
}
/* MPEG files (like those ripped from VCDs) can also look like this;
* only return half certainty */
if(vid+aud > 3) return AVPROBE_SCORE_EXTENSION;
else if(vid+aud) return 1;
else return 0;
}
static int str_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
StrDemuxContext *str = s->priv_data;
unsigned char sector[RAW_CD_SECTOR_SIZE];
int start;
int i;
/* skip over any RIFF header */
if (avio_read(pb, sector, RIFF_HEADER_SIZE) != RIFF_HEADER_SIZE)
return AVERROR(EIO);
if (AV_RL32(&sector[0]) == RIFF_TAG)
start = RIFF_HEADER_SIZE;
else
start = 0;
avio_seek(pb, start, SEEK_SET);
for(i=0; i<32; i++){
str->channels[i].video_stream_index=
str->channels[i].audio_stream_index= -1;
}
s->ctx_flags |= AVFMTCTX_NOHEADER;
return 0;
}
static int str_read_packet(AVFormatContext *s,
AVPacket *ret_pkt)
{
AVIOContext *pb = s->pb;
StrDemuxContext *str = s->priv_data;
unsigned char sector[RAW_CD_SECTOR_SIZE];
int channel, ret;
AVPacket *pkt;
AVStream *st;
while (1) {
if (avio_read(pb, sector, RAW_CD_SECTOR_SIZE) != RAW_CD_SECTOR_SIZE)
return AVERROR(EIO);
channel = sector[0x11];
if (channel >= 32)
return AVERROR_INVALIDDATA;
switch (sector[0x12] & CDXA_TYPE_MASK) {
case CDXA_TYPE_DATA:
case CDXA_TYPE_VIDEO:
{
int current_sector = AV_RL16(&sector[0x1C]);
int sector_count = AV_RL16(&sector[0x1E]);
int frame_size = AV_RL32(&sector[0x24]);
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);
break;
}
if(str->channels[channel].video_stream_index < 0){
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 15);
str->channels[channel].video_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_MDEC;
st->codecpar->codec_tag = 0; /* no fourcc */
st->codecpar->width = AV_RL16(&sector[0x28]);
st->codecpar->height = AV_RL16(&sector[0x2A]);
}
/* if this is the first sector of the frame, allocate a pkt */
pkt = &str->channels[channel].tmp_pkt;
if(pkt->size != sector_count*VIDEO_DATA_CHUNK_SIZE){
if(pkt->data)
av_log(s, AV_LOG_ERROR, "mismatching sector_count\n");
av_packet_unref(pkt);
ret = av_new_packet(pkt, sector_count * VIDEO_DATA_CHUNK_SIZE);
if (ret < 0)
return ret;
memset(pkt->data, 0, sector_count*VIDEO_DATA_CHUNK_SIZE);
pkt->pos= avio_tell(pb) - RAW_CD_SECTOR_SIZE;
pkt->stream_index =
str->channels[channel].video_stream_index;
}
memcpy(pkt->data + current_sector*VIDEO_DATA_CHUNK_SIZE,
sector + VIDEO_DATA_HEADER_SIZE,
VIDEO_DATA_CHUNK_SIZE);
if (current_sector == sector_count-1) {
pkt->size= frame_size;
*ret_pkt = *pkt;
pkt->data= NULL;
pkt->size= -1;
pkt->buf = NULL;
return 0;
}
}
break;
case CDXA_TYPE_AUDIO:
if(str->channels[channel].audio_stream_index < 0){
int fmt = sector[0x13];
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
str->channels[channel].audio_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
st->codecpar->codec_tag = 0; /* no fourcc */
if (fmt & 1) {
st->codecpar->channels = 2;
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
st->codecpar->channels = 1;
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
st->codecpar->sample_rate = (fmt&4)?18900:37800;
// st->codecpar->bit_rate = 0; //FIXME;
st->codecpar->block_align = 128;
avpriv_set_pts_info(st, 64, 18 * 224 / st->codecpar->channels,
st->codecpar->sample_rate);
st->start_time = 0;
}
pkt = ret_pkt;
if ((ret = av_new_packet(pkt, 2304)) < 0)
return ret;
memcpy(pkt->data,sector+24,2304);
pkt->stream_index =
str->channels[channel].audio_stream_index;
pkt->duration = 1;
return 0;
default:
av_log(s, AV_LOG_WARNING, "Unknown sector type %02X\n", sector[0x12]);
/* drop the sector and move on */
break;
}
if (avio_feof(pb))
return AVERROR(EIO);
}
}
static int str_read_close(AVFormatContext *s)
{
StrDemuxContext *str = s->priv_data;
int i;
for(i=0; i<32; i++){
if(str->channels[i].tmp_pkt.data)
av_packet_unref(&str->channels[i].tmp_pkt);
}
return 0;
}
const AVInputFormat ff_str_demuxer = {
.name = "psxstr",
.long_name = NULL_IF_CONFIG_SMALL("Sony Playstation STR"),
.priv_data_size = sizeof(StrDemuxContext),
.read_probe = str_probe,
.read_header = str_read_header,
.read_packet = str_read_packet,
.read_close = str_read_close,
.flags = AVFMT_NO_BYTE_SEEK,
};
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