237 lines
7.2 KiB
C
Executable File
237 lines
7.2 KiB
C
Executable File
/*
|
|
* DXA demuxer
|
|
* Copyright (c) 2007 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "riff.h"
|
|
|
|
#define DXA_EXTRA_SIZE 9
|
|
|
|
typedef struct DXAContext {
|
|
int frames;
|
|
int has_sound;
|
|
int bpc;
|
|
uint32_t bytes_left;
|
|
int64_t wavpos, vidpos;
|
|
int readvid;
|
|
}DXAContext;
|
|
|
|
static int dxa_probe(const AVProbeData *p)
|
|
{
|
|
int w, h;
|
|
if (p->buf_size < 15)
|
|
return 0;
|
|
w = AV_RB16(p->buf + 11);
|
|
h = AV_RB16(p->buf + 13);
|
|
/* check file header */
|
|
if (p->buf[0] == 'D' && p->buf[1] == 'E' &&
|
|
p->buf[2] == 'X' && p->buf[3] == 'A' &&
|
|
w && w <= 2048 && h && h <= 2048)
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int dxa_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
DXAContext *c = s->priv_data;
|
|
AVStream *st, *ast;
|
|
uint32_t tag;
|
|
int32_t fps;
|
|
int w, h;
|
|
int num, den;
|
|
int flags;
|
|
int ret;
|
|
|
|
tag = avio_rl32(pb);
|
|
if (tag != MKTAG('D', 'E', 'X', 'A'))
|
|
return AVERROR_INVALIDDATA;
|
|
flags = avio_r8(pb);
|
|
c->frames = avio_rb16(pb);
|
|
if(!c->frames){
|
|
av_log(s, AV_LOG_ERROR, "File contains no frames ???\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
fps = avio_rb32(pb);
|
|
if(fps > 0){
|
|
den = 1000;
|
|
num = fps;
|
|
}else if (fps < 0){
|
|
den = 100000;
|
|
num = -fps;
|
|
}else{
|
|
den = 10;
|
|
num = 1;
|
|
}
|
|
w = avio_rb16(pb);
|
|
h = avio_rb16(pb);
|
|
c->has_sound = 0;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
// Parse WAV data header
|
|
if(avio_rl32(pb) == MKTAG('W', 'A', 'V', 'E')){
|
|
uint32_t size, fsize;
|
|
c->has_sound = 1;
|
|
size = avio_rb32(pb);
|
|
c->vidpos = avio_tell(pb) + size;
|
|
avio_skip(pb, 16);
|
|
fsize = avio_rl32(pb);
|
|
|
|
ast = avformat_new_stream(s, NULL);
|
|
if (!ast)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_get_wav_header(s, pb, ast->codecpar, fsize, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ast->codecpar->sample_rate > 0)
|
|
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
|
|
// find 'data' chunk
|
|
while(avio_tell(pb) < c->vidpos && !avio_feof(pb)){
|
|
tag = avio_rl32(pb);
|
|
fsize = avio_rl32(pb);
|
|
if(tag == MKTAG('d', 'a', 't', 'a')) break;
|
|
avio_skip(pb, fsize);
|
|
}
|
|
c->bpc = (fsize + c->frames - 1) / c->frames;
|
|
if(ast->codecpar->block_align)
|
|
c->bpc = ((c->bpc + ast->codecpar->block_align - 1) / ast->codecpar->block_align) * ast->codecpar->block_align;
|
|
c->bytes_left = fsize;
|
|
c->wavpos = avio_tell(pb);
|
|
avio_seek(pb, c->vidpos, SEEK_SET);
|
|
}
|
|
|
|
/* now we are ready: build format streams */
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_DXA;
|
|
st->codecpar->width = w;
|
|
st->codecpar->height = h;
|
|
av_reduce(&den, &num, den, num, (1UL<<31)-1);
|
|
avpriv_set_pts_info(st, 33, num, den);
|
|
/* flags & 0x80 means that image is interlaced,
|
|
* flags & 0x40 means that image has double height
|
|
* either way set true height
|
|
*/
|
|
if(flags & 0xC0){
|
|
st->codecpar->height >>= 1;
|
|
}
|
|
c->readvid = !c->has_sound;
|
|
c->vidpos = avio_tell(pb);
|
|
s->start_time = 0;
|
|
s->duration = (int64_t)c->frames * AV_TIME_BASE * num / den;
|
|
av_log(s, AV_LOG_DEBUG, "%d frame(s)\n",c->frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dxa_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
DXAContext *c = s->priv_data;
|
|
int ret;
|
|
uint32_t size;
|
|
uint8_t buf[DXA_EXTRA_SIZE], pal[768+4];
|
|
int pal_size = 0;
|
|
|
|
if(!c->readvid && c->has_sound && c->bytes_left){
|
|
c->readvid = 1;
|
|
avio_seek(s->pb, c->wavpos, SEEK_SET);
|
|
size = FFMIN(c->bytes_left, c->bpc);
|
|
ret = av_get_packet(s->pb, pkt, size);
|
|
pkt->stream_index = 1;
|
|
if(ret != size)
|
|
return AVERROR(EIO);
|
|
c->bytes_left -= size;
|
|
c->wavpos = avio_tell(s->pb);
|
|
return 0;
|
|
}
|
|
avio_seek(s->pb, c->vidpos, SEEK_SET);
|
|
while(!avio_feof(s->pb) && c->frames){
|
|
uint32_t tag;
|
|
if ((ret = avio_read(s->pb, buf, 4)) != 4) {
|
|
av_log(s, AV_LOG_ERROR, "failed reading chunk type\n");
|
|
return ret < 0 ? ret : AVERROR_INVALIDDATA;
|
|
}
|
|
tag = AV_RL32(buf);
|
|
switch (tag) {
|
|
case MKTAG('N', 'U', 'L', 'L'):
|
|
if ((ret = av_new_packet(pkt, 4 + pal_size)) < 0)
|
|
return ret;
|
|
pkt->stream_index = 0;
|
|
if(pal_size) memcpy(pkt->data, pal, pal_size);
|
|
memcpy(pkt->data + pal_size, buf, 4);
|
|
c->frames--;
|
|
c->vidpos = avio_tell(s->pb);
|
|
c->readvid = 0;
|
|
return 0;
|
|
case MKTAG('C', 'M', 'A', 'P'):
|
|
pal_size = 768+4;
|
|
memcpy(pal, buf, 4);
|
|
avio_read(s->pb, pal + 4, 768);
|
|
break;
|
|
case MKTAG('F', 'R', 'A', 'M'):
|
|
if ((ret = avio_read(s->pb, buf + 4, DXA_EXTRA_SIZE - 4)) != DXA_EXTRA_SIZE - 4) {
|
|
av_log(s, AV_LOG_ERROR, "failed reading dxa_extra\n");
|
|
return ret < 0 ? ret : AVERROR_INVALIDDATA;
|
|
}
|
|
size = AV_RB32(buf + 5);
|
|
if(size > 0xFFFFFF){
|
|
av_log(s, AV_LOG_ERROR, "Frame size is too big: %"PRIu32"\n",
|
|
size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ret = av_new_packet(pkt, size + DXA_EXTRA_SIZE + pal_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
memcpy(pkt->data + pal_size, buf, DXA_EXTRA_SIZE);
|
|
ret = avio_read(s->pb, pkt->data + DXA_EXTRA_SIZE + pal_size, size);
|
|
if(ret != size){
|
|
return AVERROR(EIO);
|
|
}
|
|
if(pal_size) memcpy(pkt->data, pal, pal_size);
|
|
pkt->stream_index = 0;
|
|
c->frames--;
|
|
c->vidpos = avio_tell(s->pb);
|
|
c->readvid = 0;
|
|
return 0;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "Unknown tag %s\n", av_fourcc2str(tag));
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
AVInputFormat ff_dxa_demuxer = {
|
|
.name = "dxa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("DXA"),
|
|
.priv_data_size = sizeof(DXAContext),
|
|
.read_probe = dxa_probe,
|
|
.read_header = dxa_read_header,
|
|
.read_packet = dxa_read_packet,
|
|
};
|