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FFmpeg/libavcodec/dxa.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* 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 "codec_internal.h"
#include "internal.h"
#include <zlib.h>
/*
* Decoder context
*/
typedef struct DxaDecContext {
AVFrame *prev;
int dsize;
#define DECOMP_BUF_PADDING 16
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, int srcsize, uint8_t *ref)
{
uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
uint8_t *src_end = src + srcsize;
int i, j, k;
int type, x, y, d, d2;
uint32_t mask;
if (12ULL + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize)
return AVERROR_INVALIDDATA;
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){
if (data > src_end || mv > src_end || msk > src_end)
return AVERROR_INVALIDDATA;
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, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
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;
}
memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING);
}
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 & AV_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, dsize, 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;
if (avctx->width%4 || avctx->height%4) {
avpriv_request_sample(avctx, "dimensions are not a multiple of 4");
return AVERROR_INVALIDDATA;
}
c->prev = av_frame_alloc();
if (!c->prev)
return AVERROR(ENOMEM);
avctx->pix_fmt = AV_PIX_FMT_PAL8;
c->dsize = avctx->width * avctx->height * 2;
c->decomp_buf = av_malloc(c->dsize + DECOMP_BUF_PADDING);
if (!c->decomp_buf) {
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;
}
const FFCodec ff_dxa_decoder = {
.p.name = "dxa",
.p.long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_DXA,
.priv_data_size = sizeof(DxaDecContext),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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