mirror of https://git.ffmpeg.org/ffmpeg.git
362 lines
12 KiB
C
362 lines
12 KiB
C
/*
|
|
* Feeble Files/ScummVM DXA decoder
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* DXA Video decoder
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "bytestream.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
#include <zlib.h>
|
|
|
|
/*
|
|
* Decoder context
|
|
*/
|
|
typedef struct DxaDecContext {
|
|
AVFrame *prev;
|
|
|
|
int dsize;
|
|
uint8_t *decomp_buf;
|
|
uint32_t pal[256];
|
|
} DxaDecContext;
|
|
|
|
static const int shift1[6] = { 0, 8, 8, 8, 4, 4 };
|
|
static const int shift2[6] = { 0, 0, 8, 4, 0, 4 };
|
|
|
|
static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst,
|
|
int stride, uint8_t *src, uint8_t *ref)
|
|
{
|
|
uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
|
|
int i, j, k;
|
|
int type, x, y, d, d2;
|
|
uint32_t mask;
|
|
|
|
code = src + 12;
|
|
data = code + ((avctx->width * avctx->height) >> 4);
|
|
mv = data + AV_RB32(src + 0);
|
|
msk = mv + AV_RB32(src + 4);
|
|
|
|
for(j = 0; j < avctx->height; j += 4){
|
|
for(i = 0; i < avctx->width; i += 4){
|
|
tmp = dst + i;
|
|
tmp2 = ref + i;
|
|
type = *code++;
|
|
switch(type){
|
|
case 4: // motion compensation
|
|
x = (*mv) >> 4; if(x & 8) x = 8 - x;
|
|
y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
|
|
if (i < -x || avctx->width - i - 4 < x ||
|
|
j < -y || avctx->height - j - 4 < y) {
|
|
av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
tmp2 += x + y*stride;
|
|
case 0: // skip
|
|
case 5: // skip in method 12
|
|
for(y = 0; y < 4; y++){
|
|
memcpy(tmp, tmp2, 4);
|
|
tmp += stride;
|
|
tmp2 += stride;
|
|
}
|
|
break;
|
|
case 1: // masked change
|
|
case 10: // masked change with only half of pixels changed
|
|
case 11: // cases 10-15 are for method 12 only
|
|
case 12:
|
|
case 13:
|
|
case 14:
|
|
case 15:
|
|
if(type == 1){
|
|
mask = AV_RB16(msk);
|
|
msk += 2;
|
|
}else{
|
|
type -= 10;
|
|
mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
|
|
msk++;
|
|
}
|
|
for(y = 0; y < 4; y++){
|
|
for(x = 0; x < 4; x++){
|
|
tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
|
|
mask <<= 1;
|
|
}
|
|
tmp += stride;
|
|
tmp2 += stride;
|
|
}
|
|
break;
|
|
case 2: // fill block
|
|
for(y = 0; y < 4; y++){
|
|
memset(tmp, data[0], 4);
|
|
tmp += stride;
|
|
}
|
|
data++;
|
|
break;
|
|
case 3: // raw block
|
|
for(y = 0; y < 4; y++){
|
|
memcpy(tmp, data, 4);
|
|
data += 4;
|
|
tmp += stride;
|
|
}
|
|
break;
|
|
case 8: // subblocks - method 13 only
|
|
mask = *msk++;
|
|
for(k = 0; k < 4; k++){
|
|
d = ((k & 1) << 1) + ((k & 2) * stride);
|
|
d2 = ((k & 1) << 1) + ((k & 2) * stride);
|
|
tmp2 = ref + i + d2;
|
|
switch(mask & 0xC0){
|
|
case 0x80: // motion compensation
|
|
x = (*mv) >> 4; if(x & 8) x = 8 - x;
|
|
y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
|
|
if (i + 2*(k & 1) < -x || avctx->width - i - 2*(k & 1) - 2 < x ||
|
|
j + (k & 2) < -y || avctx->height - j - (k & 2) - 2 < y) {
|
|
av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
tmp2 += x + y*stride;
|
|
case 0x00: // skip
|
|
tmp[d + 0 ] = tmp2[0];
|
|
tmp[d + 1 ] = tmp2[1];
|
|
tmp[d + 0 + stride] = tmp2[0 + stride];
|
|
tmp[d + 1 + stride] = tmp2[1 + stride];
|
|
break;
|
|
case 0x40: // fill
|
|
tmp[d + 0 ] = data[0];
|
|
tmp[d + 1 ] = data[0];
|
|
tmp[d + 0 + stride] = data[0];
|
|
tmp[d + 1 + stride] = data[0];
|
|
data++;
|
|
break;
|
|
case 0xC0: // raw
|
|
tmp[d + 0 ] = *data++;
|
|
tmp[d + 1 ] = *data++;
|
|
tmp[d + 0 + stride] = *data++;
|
|
tmp[d + 1 + stride] = *data++;
|
|
break;
|
|
}
|
|
mask <<= 2;
|
|
}
|
|
break;
|
|
case 32: // vector quantization - 2 colors
|
|
mask = AV_RB16(msk);
|
|
msk += 2;
|
|
for(y = 0; y < 4; y++){
|
|
for(x = 0; x < 4; x++){
|
|
tmp[x] = data[mask & 1];
|
|
mask >>= 1;
|
|
}
|
|
tmp += stride;
|
|
tmp2 += stride;
|
|
}
|
|
data += 2;
|
|
break;
|
|
case 33: // vector quantization - 3 or 4 colors
|
|
case 34:
|
|
mask = AV_RB32(msk);
|
|
msk += 4;
|
|
for(y = 0; y < 4; y++){
|
|
for(x = 0; x < 4; x++){
|
|
tmp[x] = data[mask & 3];
|
|
mask >>= 2;
|
|
}
|
|
tmp += stride;
|
|
tmp2 += stride;
|
|
}
|
|
data += type - 30;
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
dst += stride * 4;
|
|
ref += stride * 4;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
DxaDecContext * const c = avctx->priv_data;
|
|
uint8_t *outptr, *srcptr, *tmpptr;
|
|
unsigned long dsize;
|
|
int i, j, compr, ret;
|
|
int stride;
|
|
int pc = 0;
|
|
GetByteContext gb;
|
|
|
|
bytestream2_init(&gb, avpkt->data, avpkt->size);
|
|
|
|
/* make the palette available on the way out */
|
|
if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) {
|
|
bytestream2_skip(&gb, 4);
|
|
for(i = 0; i < 256; i++){
|
|
c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
|
|
}
|
|
pc = 1;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
|
|
frame->palette_has_changed = pc;
|
|
|
|
outptr = frame->data[0];
|
|
srcptr = c->decomp_buf;
|
|
tmpptr = c->prev->data[0];
|
|
stride = frame->linesize[0];
|
|
|
|
if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L'))
|
|
compr = -1;
|
|
else
|
|
compr = bytestream2_get_byte(&gb);
|
|
|
|
dsize = c->dsize;
|
|
if (compr != 4 && compr != -1) {
|
|
bytestream2_skip(&gb, 4);
|
|
if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb),
|
|
bytestream2_get_bytes_left(&gb)) != Z_OK) {
|
|
av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
|
|
return AVERROR_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
if (avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize);
|
|
|
|
switch(compr){
|
|
case -1:
|
|
frame->key_frame = 0;
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
|
if (c->prev->data[0])
|
|
memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height);
|
|
else{ // Should happen only when first frame is 'NULL'
|
|
memset(frame->data[0], 0, frame->linesize[0] * avctx->height);
|
|
frame->key_frame = 1;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
}
|
|
break;
|
|
case 2:
|
|
case 4:
|
|
frame->key_frame = 1;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
for (j = 0; j < avctx->height; j++) {
|
|
memcpy(outptr, srcptr, avctx->width);
|
|
outptr += stride;
|
|
srcptr += avctx->width;
|
|
}
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
if (!tmpptr) {
|
|
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
|
|
if (!(avctx->flags2 & CODEC_FLAG2_SHOW_ALL))
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
frame->key_frame = 0;
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
|
for (j = 0; j < avctx->height; j++) {
|
|
if(tmpptr){
|
|
for(i = 0; i < avctx->width; i++)
|
|
outptr[i] = srcptr[i] ^ tmpptr[i];
|
|
tmpptr += stride;
|
|
}else
|
|
memcpy(outptr, srcptr, avctx->width);
|
|
outptr += stride;
|
|
srcptr += avctx->width;
|
|
}
|
|
break;
|
|
case 12: // ScummVM coding
|
|
case 13:
|
|
frame->key_frame = 0;
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
|
if (!c->prev->data[0]) {
|
|
av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, c->prev->data[0]);
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
av_frame_unref(c->prev);
|
|
if ((ret = av_frame_ref(c->prev, frame)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
DxaDecContext * const c = avctx->priv_data;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
|
|
c->prev = av_frame_alloc();
|
|
if (!c->prev)
|
|
return AVERROR(ENOMEM);
|
|
|
|
c->dsize = avctx->width * avctx->height * 2;
|
|
c->decomp_buf = av_malloc(c->dsize);
|
|
if (!c->decomp_buf) {
|
|
av_frame_free(&c->prev);
|
|
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
DxaDecContext * const c = avctx->priv_data;
|
|
|
|
av_freep(&c->decomp_buf);
|
|
av_frame_free(&c->prev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_dxa_decoder = {
|
|
.name = "dxa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_DXA,
|
|
.priv_data_size = sizeof(DxaDecContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
};
|