669 lines
20 KiB
C
669 lines
20 KiB
C
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/*
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* Zip Motion Blocks Video (ZMBV) decoder
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Zip Motion Blocks Video decoder
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libavutil/common.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#include <zlib.h>
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#define ZMBV_KEYFRAME 1
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#define ZMBV_DELTAPAL 2
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enum ZmbvFormat {
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ZMBV_FMT_NONE = 0,
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ZMBV_FMT_1BPP = 1,
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ZMBV_FMT_2BPP = 2,
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ZMBV_FMT_4BPP = 3,
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ZMBV_FMT_8BPP = 4,
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ZMBV_FMT_15BPP = 5,
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ZMBV_FMT_16BPP = 6,
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ZMBV_FMT_24BPP = 7,
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ZMBV_FMT_32BPP = 8
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};
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/*
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* Decoder context
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*/
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typedef struct ZmbvContext {
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AVCodecContext *avctx;
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int bpp;
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int alloc_bpp;
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unsigned int decomp_size;
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uint8_t* decomp_buf;
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uint8_t pal[768];
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uint8_t *prev, *cur;
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int width, height;
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int fmt;
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int comp;
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int flags;
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int stride;
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int bw, bh, bx, by;
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int decomp_len;
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int got_keyframe;
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z_stream zstream;
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int (*decode_xor)(struct ZmbvContext *c);
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} ZmbvContext;
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/**
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* Decode XOR'ed frame - 8bpp version
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*/
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static int zmbv_decode_xor_8(ZmbvContext *c)
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{
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uint8_t *src = c->decomp_buf;
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uint8_t *output, *prev;
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int8_t *mvec;
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int x, y;
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int d, dx, dy, bw2, bh2;
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int block;
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int i, j;
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int mx, my;
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output = c->cur;
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prev = c->prev;
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if (c->flags & ZMBV_DELTAPAL) {
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for (i = 0; i < 768; i++)
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c->pal[i] ^= *src++;
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}
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mvec = (int8_t*)src;
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src += ((c->bx * c->by * 2 + 3) & ~3);
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block = 0;
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for (y = 0; y < c->height; y += c->bh) {
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bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
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for (x = 0; x < c->width; x += c->bw) {
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uint8_t *out, *tprev;
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d = mvec[block] & 1;
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dx = mvec[block] >> 1;
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dy = mvec[block + 1] >> 1;
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block += 2;
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bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
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/* copy block - motion vectors out of bounds are used to zero blocks */
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out = output + x;
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tprev = prev + x + dx + dy * c->width;
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mx = x + dx;
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my = y + dy;
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for (j = 0; j < bh2; j++) {
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if (my + j < 0 || my + j >= c->height) {
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memset(out, 0, bw2);
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} else if (mx >= 0 && mx + bw2 <= c->width){
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memcpy(out, tprev, sizeof(*out) * bw2);
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} else {
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for (i = 0; i < bw2; i++) {
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if (mx + i < 0 || mx + i >= c->width)
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out[i] = 0;
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else
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out[i] = tprev[i];
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}
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}
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out += c->width;
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tprev += c->width;
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}
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if (d) { /* apply XOR'ed difference */
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out = output + x;
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for (j = 0; j < bh2; j++) {
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for (i = 0; i < bw2; i++)
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out[i] ^= *src++;
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out += c->width;
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}
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}
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}
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output += c->width * c->bh;
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prev += c->width * c->bh;
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}
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if (src - c->decomp_buf != c->decomp_len)
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av_log(c->avctx, AV_LOG_ERROR, "Used %"PTRDIFF_SPECIFIER" of %i bytes\n",
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src-c->decomp_buf, c->decomp_len);
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return 0;
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}
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/**
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* Decode XOR'ed frame - 15bpp and 16bpp version
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*/
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static int zmbv_decode_xor_16(ZmbvContext *c)
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{
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uint8_t *src = c->decomp_buf;
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uint16_t *output, *prev;
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int8_t *mvec;
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int x, y;
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int d, dx, dy, bw2, bh2;
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int block;
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int i, j;
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int mx, my;
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output = (uint16_t*)c->cur;
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prev = (uint16_t*)c->prev;
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mvec = (int8_t*)src;
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src += ((c->bx * c->by * 2 + 3) & ~3);
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block = 0;
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for (y = 0; y < c->height; y += c->bh) {
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bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
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for (x = 0; x < c->width; x += c->bw) {
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uint16_t *out, *tprev;
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d = mvec[block] & 1;
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dx = mvec[block] >> 1;
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dy = mvec[block + 1] >> 1;
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block += 2;
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bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
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/* copy block - motion vectors out of bounds are used to zero blocks */
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out = output + x;
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tprev = prev + x + dx + dy * c->width;
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mx = x + dx;
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my = y + dy;
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for (j = 0; j < bh2; j++) {
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if (my + j < 0 || my + j >= c->height) {
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memset(out, 0, bw2 * 2);
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} else if (mx >= 0 && mx + bw2 <= c->width){
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memcpy(out, tprev, sizeof(*out) * bw2);
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} else {
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for (i = 0; i < bw2; i++) {
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if (mx + i < 0 || mx + i >= c->width)
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out[i] = 0;
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else
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out[i] = tprev[i];
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}
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}
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out += c->width;
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tprev += c->width;
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}
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if (d) { /* apply XOR'ed difference */
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out = output + x;
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for (j = 0; j < bh2; j++){
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for (i = 0; i < bw2; i++) {
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out[i] ^= *((uint16_t*)src);
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src += 2;
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}
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out += c->width;
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}
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}
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}
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output += c->width * c->bh;
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prev += c->width * c->bh;
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}
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if (src - c->decomp_buf != c->decomp_len)
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av_log(c->avctx, AV_LOG_ERROR, "Used %"PTRDIFF_SPECIFIER" of %i bytes\n",
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src-c->decomp_buf, c->decomp_len);
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return 0;
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}
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#ifdef ZMBV_ENABLE_24BPP
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/**
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* Decode XOR'ed frame - 24bpp version
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*/
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static int zmbv_decode_xor_24(ZmbvContext *c)
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{
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uint8_t *src = c->decomp_buf;
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uint8_t *output, *prev;
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int8_t *mvec;
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int x, y;
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int d, dx, dy, bw2, bh2;
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int block;
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int i, j;
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int mx, my;
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int stride;
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output = c->cur;
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prev = c->prev;
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stride = c->width * 3;
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mvec = (int8_t*)src;
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src += ((c->bx * c->by * 2 + 3) & ~3);
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block = 0;
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for (y = 0; y < c->height; y += c->bh) {
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bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
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for (x = 0; x < c->width; x += c->bw) {
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uint8_t *out, *tprev;
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d = mvec[block] & 1;
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dx = mvec[block] >> 1;
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dy = mvec[block + 1] >> 1;
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block += 2;
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bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
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/* copy block - motion vectors out of bounds are used to zero blocks */
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out = output + x * 3;
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tprev = prev + (x + dx) * 3 + dy * stride;
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mx = x + dx;
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my = y + dy;
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for (j = 0; j < bh2; j++) {
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if (my + j < 0 || my + j >= c->height) {
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memset(out, 0, bw2 * 3);
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} else if (mx >= 0 && mx + bw2 <= c->width){
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memcpy(out, tprev, 3 * bw2);
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} else {
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for (i = 0; i < bw2; i++){
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if (mx + i < 0 || mx + i >= c->width) {
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out[i * 3 + 0] = 0;
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out[i * 3 + 1] = 0;
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out[i * 3 + 2] = 0;
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} else {
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out[i * 3 + 0] = tprev[i * 3 + 0];
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out[i * 3 + 1] = tprev[i * 3 + 1];
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out[i * 3 + 2] = tprev[i * 3 + 2];
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}
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}
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}
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out += stride;
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tprev += stride;
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}
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if (d) { /* apply XOR'ed difference */
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out = output + x * 3;
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for (j = 0; j < bh2; j++) {
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for (i = 0; i < bw2; i++) {
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out[i * 3 + 0] ^= *src++;
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out[i * 3 + 1] ^= *src++;
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out[i * 3 + 2] ^= *src++;
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}
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out += stride;
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}
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}
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}
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output += stride * c->bh;
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prev += stride * c->bh;
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}
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if (src - c->decomp_buf != c->decomp_len)
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av_log(c->avctx, AV_LOG_ERROR, "Used %"PTRDIFF_SPECIFIER" of %i bytes\n",
|
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src-c->decomp_buf, c->decomp_len);
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return 0;
|
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}
|
||
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#endif //ZMBV_ENABLE_24BPP
|
||
|
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|
||
|
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/**
|
||
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* Decode XOR'ed frame - 32bpp version
|
||
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*/
|
||
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||
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static int zmbv_decode_xor_32(ZmbvContext *c)
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{
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uint8_t *src = c->decomp_buf;
|
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uint32_t *output, *prev;
|
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int8_t *mvec;
|
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|
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int x, y;
|
||
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int d, dx, dy, bw2, bh2;
|
||
|
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int block;
|
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|
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int i, j;
|
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int mx, my;
|
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output = (uint32_t*)c->cur;
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prev = (uint32_t*)c->prev;
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mvec = (int8_t*)src;
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src += ((c->bx * c->by * 2 + 3) & ~3);
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||
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block = 0;
|
||
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for (y = 0; y < c->height; y += c->bh) {
|
||
|
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bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
|
||
|
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for (x = 0; x < c->width; x += c->bw) {
|
||
|
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uint32_t *out, *tprev;
|
||
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|
||
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d = mvec[block] & 1;
|
||
|
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dx = mvec[block] >> 1;
|
||
|
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dy = mvec[block + 1] >> 1;
|
||
|
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block += 2;
|
||
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|
||
|
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bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
|
||
|
|
|
||
|
|
/* copy block - motion vectors out of bounds are used to zero blocks */
|
||
|
|
out = output + x;
|
||
|
|
tprev = prev + x + dx + dy * c->width;
|
||
|
|
mx = x + dx;
|
||
|
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my = y + dy;
|
||
|
|
for (j = 0; j < bh2; j++) {
|
||
|
|
if (my + j < 0 || my + j >= c->height) {
|
||
|
|
memset(out, 0, bw2 * 4);
|
||
|
|
} else if (mx >= 0 && mx + bw2 <= c->width){
|
||
|
|
memcpy(out, tprev, sizeof(*out) * bw2);
|
||
|
|
} else {
|
||
|
|
for (i = 0; i < bw2; i++){
|
||
|
|
if (mx + i < 0 || mx + i >= c->width)
|
||
|
|
out[i] = 0;
|
||
|
|
else
|
||
|
|
out[i] = tprev[i];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
out += c->width;
|
||
|
|
tprev += c->width;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (d) { /* apply XOR'ed difference */
|
||
|
|
out = output + x;
|
||
|
|
for (j = 0; j < bh2; j++){
|
||
|
|
for (i = 0; i < bw2; i++) {
|
||
|
|
out[i] ^= *((uint32_t *) src);
|
||
|
|
src += 4;
|
||
|
|
}
|
||
|
|
out += c->width;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
output += c->width * c->bh;
|
||
|
|
prev += c->width * c->bh;
|
||
|
|
}
|
||
|
|
if (src - c->decomp_buf != c->decomp_len)
|
||
|
|
av_log(c->avctx, AV_LOG_ERROR, "Used %"PTRDIFF_SPECIFIER" of %i bytes\n",
|
||
|
|
src-c->decomp_buf, c->decomp_len);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Decode intraframe
|
||
|
|
*/
|
||
|
|
static int zmbv_decode_intra(ZmbvContext *c)
|
||
|
|
{
|
||
|
|
uint8_t *src = c->decomp_buf;
|
||
|
|
|
||
|
|
/* make the palette available on the way out */
|
||
|
|
if (c->fmt == ZMBV_FMT_8BPP) {
|
||
|
|
memcpy(c->pal, src, 768);
|
||
|
|
src += 768;
|
||
|
|
}
|
||
|
|
|
||
|
|
memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
|
||
|
|
{
|
||
|
|
AVFrame *frame = data;
|
||
|
|
const uint8_t *buf = avpkt->data;
|
||
|
|
int buf_size = avpkt->size;
|
||
|
|
ZmbvContext * const c = avctx->priv_data;
|
||
|
|
int zret = Z_OK; // Zlib return code
|
||
|
|
int len = buf_size;
|
||
|
|
int hi_ver, lo_ver, ret;
|
||
|
|
int expected_size;
|
||
|
|
|
||
|
|
/* parse header */
|
||
|
|
if (len < 1)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
c->flags = buf[0];
|
||
|
|
buf++; len--;
|
||
|
|
if (c->flags & ZMBV_KEYFRAME) {
|
||
|
|
c->got_keyframe = 0;
|
||
|
|
|
||
|
|
if (len < 6)
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
hi_ver = buf[0];
|
||
|
|
lo_ver = buf[1];
|
||
|
|
c->comp = buf[2];
|
||
|
|
c->fmt = buf[3];
|
||
|
|
c->bw = buf[4];
|
||
|
|
c->bh = buf[5];
|
||
|
|
c->decode_xor = NULL;
|
||
|
|
|
||
|
|
buf += 6;
|
||
|
|
len -= 6;
|
||
|
|
av_log(avctx, AV_LOG_DEBUG,
|
||
|
|
"Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",
|
||
|
|
c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
|
||
|
|
if (hi_ver != 0 || lo_ver != 1) {
|
||
|
|
avpriv_request_sample(avctx, "Version %i.%i", hi_ver, lo_ver);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
if (c->bw == 0 || c->bh == 0) {
|
||
|
|
avpriv_request_sample(avctx, "Block size %ix%i", c->bw, c->bh);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
if (c->comp != 0 && c->comp != 1) {
|
||
|
|
avpriv_request_sample(avctx, "Compression type %i", c->comp);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch (c->fmt) {
|
||
|
|
case ZMBV_FMT_8BPP:
|
||
|
|
c->bpp = 8;
|
||
|
|
c->decode_xor = zmbv_decode_xor_8;
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
||
|
|
c->stride = c->width;
|
||
|
|
break;
|
||
|
|
case ZMBV_FMT_15BPP:
|
||
|
|
case ZMBV_FMT_16BPP:
|
||
|
|
c->bpp = 16;
|
||
|
|
c->decode_xor = zmbv_decode_xor_16;
|
||
|
|
if (c->fmt == ZMBV_FMT_15BPP)
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
|
||
|
|
else
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
|
||
|
|
c->stride = c->width * 2;
|
||
|
|
break;
|
||
|
|
#ifdef ZMBV_ENABLE_24BPP
|
||
|
|
case ZMBV_FMT_24BPP:
|
||
|
|
c->bpp = 24;
|
||
|
|
c->decode_xor = zmbv_decode_xor_24;
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR24;
|
||
|
|
c->stride = c->width * 3;
|
||
|
|
break;
|
||
|
|
#endif //ZMBV_ENABLE_24BPP
|
||
|
|
case ZMBV_FMT_32BPP:
|
||
|
|
c->bpp = 32;
|
||
|
|
c->decode_xor = zmbv_decode_xor_32;
|
||
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR0;
|
||
|
|
c->stride = c->width * 4;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
c->decode_xor = NULL;
|
||
|
|
avpriv_request_sample(avctx, "Format %i", c->fmt);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
|
||
|
|
zret = inflateReset(&c->zstream);
|
||
|
|
if (zret != Z_OK) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
|
||
|
|
return AVERROR_UNKNOWN;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c->alloc_bpp < c->bpp) {
|
||
|
|
c->cur = av_realloc_f(c->cur, avctx->width * avctx->height, (c->bpp / 8));
|
||
|
|
c->prev = av_realloc_f(c->prev, avctx->width * avctx->height, (c->bpp / 8));
|
||
|
|
c->alloc_bpp = c->bpp;
|
||
|
|
}
|
||
|
|
c->bx = (c->width + c->bw - 1) / c->bw;
|
||
|
|
c->by = (c->height+ c->bh - 1) / c->bh;
|
||
|
|
if (!c->cur || !c->prev) {
|
||
|
|
c->alloc_bpp = 0;
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
memset(c->cur, 0, avctx->width * avctx->height * (c->bpp / 8));
|
||
|
|
memset(c->prev, 0, avctx->width * avctx->height * (c->bpp / 8));
|
||
|
|
c->got_keyframe = 1;
|
||
|
|
}
|
||
|
|
if (c->flags & ZMBV_KEYFRAME) {
|
||
|
|
expected_size = avctx->width * avctx->height * (c->bpp / 8);
|
||
|
|
} else {
|
||
|
|
expected_size = (c->bx * c->by * 2 + 3) & ~3;
|
||
|
|
}
|
||
|
|
if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
|
||
|
|
(c->flags & (ZMBV_DELTAPAL | ZMBV_KEYFRAME)))
|
||
|
|
expected_size += 768;
|
||
|
|
|
||
|
|
if (!c->got_keyframe) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (c->comp == 0) { // uncompressed data
|
||
|
|
if (c->decomp_size < len) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Buffer too small\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
memcpy(c->decomp_buf, buf, len);
|
||
|
|
c->decomp_len = len;
|
||
|
|
} else { // ZLIB-compressed data
|
||
|
|
c->zstream.total_in = c->zstream.total_out = 0;
|
||
|
|
c->zstream.next_in = buf;
|
||
|
|
c->zstream.avail_in = len;
|
||
|
|
c->zstream.next_out = c->decomp_buf;
|
||
|
|
c->zstream.avail_out = c->decomp_size;
|
||
|
|
zret = inflate(&c->zstream, Z_SYNC_FLUSH);
|
||
|
|
if (zret != Z_OK && zret != Z_STREAM_END) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "inflate error %d\n", zret);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
c->decomp_len = c->zstream.total_out;
|
||
|
|
}
|
||
|
|
if (expected_size > c->decomp_len ||
|
||
|
|
(c->flags & ZMBV_KEYFRAME) && expected_size < c->decomp_len) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "decompressed size %d is incorrect, expected %d\n", c->decomp_len, expected_size);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
if (c->flags & ZMBV_KEYFRAME) {
|
||
|
|
frame->key_frame = 1;
|
||
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
||
|
|
zmbv_decode_intra(c);
|
||
|
|
} else {
|
||
|
|
frame->key_frame = 0;
|
||
|
|
frame->pict_type = AV_PICTURE_TYPE_P;
|
||
|
|
if (c->decomp_len < 2LL * ((c->width + c->bw - 1) / c->bw) * ((c->height + c->bh - 1) / c->bh))
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
if (c->decomp_len)
|
||
|
|
c->decode_xor(c);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* update frames */
|
||
|
|
{
|
||
|
|
uint8_t *out, *src;
|
||
|
|
int j;
|
||
|
|
|
||
|
|
out = frame->data[0];
|
||
|
|
src = c->cur;
|
||
|
|
switch (c->fmt) {
|
||
|
|
case ZMBV_FMT_8BPP:
|
||
|
|
for (j = 0; j < 256; j++)
|
||
|
|
AV_WN32(&frame->data[1][j * 4], 0xFFU << 24 | AV_RB24(&c->pal[j * 3]));
|
||
|
|
case ZMBV_FMT_15BPP:
|
||
|
|
case ZMBV_FMT_16BPP:
|
||
|
|
#ifdef ZMBV_ENABLE_24BPP
|
||
|
|
case ZMBV_FMT_24BPP:
|
||
|
|
#endif
|
||
|
|
case ZMBV_FMT_32BPP:
|
||
|
|
av_image_copy_plane(out, frame->linesize[0], src, c->stride,
|
||
|
|
c->stride, c->height);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
|
||
|
|
}
|
||
|
|
FFSWAP(uint8_t *, c->cur, c->prev);
|
||
|
|
}
|
||
|
|
*got_frame = 1;
|
||
|
|
|
||
|
|
/* always report that the buffer was completely consumed */
|
||
|
|
return buf_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
ZmbvContext * const c = avctx->priv_data;
|
||
|
|
int zret; // Zlib return code
|
||
|
|
|
||
|
|
c->avctx = avctx;
|
||
|
|
|
||
|
|
c->width = avctx->width;
|
||
|
|
c->height = avctx->height;
|
||
|
|
|
||
|
|
c->bpp = avctx->bits_per_coded_sample;
|
||
|
|
|
||
|
|
// Needed if zlib unused or init aborted before inflateInit
|
||
|
|
memset(&c->zstream, 0, sizeof(z_stream));
|
||
|
|
|
||
|
|
if ((avctx->width + 255ULL) * (avctx->height + 64ULL) > FFMIN(avctx->max_pixels, INT_MAX / 4) ) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Internal buffer (decomp_size) larger than max_pixels or too large\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
|
||
|
|
|
||
|
|
/* Allocate decompression buffer */
|
||
|
|
c->decomp_buf = av_mallocz(c->decomp_size);
|
||
|
|
if (!c->decomp_buf) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR,
|
||
|
|
"Can't allocate decompression buffer.\n");
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
|
||
|
|
c->zstream.zalloc = Z_NULL;
|
||
|
|
c->zstream.zfree = Z_NULL;
|
||
|
|
c->zstream.opaque = Z_NULL;
|
||
|
|
zret = inflateInit(&c->zstream);
|
||
|
|
if (zret != Z_OK) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
|
||
|
|
return AVERROR_UNKNOWN;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
||
|
|
{
|
||
|
|
ZmbvContext * const c = avctx->priv_data;
|
||
|
|
|
||
|
|
av_freep(&c->decomp_buf);
|
||
|
|
|
||
|
|
inflateEnd(&c->zstream);
|
||
|
|
av_freep(&c->cur);
|
||
|
|
av_freep(&c->prev);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVCodec ff_zmbv_decoder = {
|
||
|
|
.name = "zmbv",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
|
||
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
|
.id = AV_CODEC_ID_ZMBV,
|
||
|
|
.priv_data_size = sizeof(ZmbvContext),
|
||
|
|
.init = decode_init,
|
||
|
|
.close = decode_end,
|
||
|
|
.decode = decode_frame,
|
||
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
||
|
|
};
|