mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
925 lines
28 KiB
C
925 lines
28 KiB
C
/*
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* ScreenPressor decoder
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*
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* Copyright (c) 2017 Paul B Mahol
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#define TOP 0x01000000
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#define BOT 0x010000
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typedef struct RangeCoder {
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unsigned code;
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unsigned range;
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unsigned code1;
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} RangeCoder;
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typedef struct PixelModel {
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unsigned freq[256];
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unsigned lookup[16];
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unsigned total_freq;
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} PixelModel;
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typedef struct SCPRContext {
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AVFrame *last_frame;
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AVFrame *current_frame;
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GetByteContext gb;
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RangeCoder rc;
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PixelModel pixel_model[3][4096];
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unsigned op_model[6][7];
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unsigned run_model[6][257];
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unsigned range_model[257];
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unsigned count_model[257];
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unsigned fill_model[6];
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unsigned sxy_model[4][17];
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unsigned mv_model[2][513];
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unsigned nbx, nby;
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unsigned nbcount;
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unsigned *blocks;
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unsigned cbits;
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int cxshift;
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int (*get_freq)(RangeCoder *rc, unsigned total_freq, unsigned *freq);
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int (*decode)(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq);
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} SCPRContext;
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static void init_rangecoder(RangeCoder *rc, GetByteContext *gb)
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{
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rc->code1 = 0;
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rc->range = 0xFFFFFFFFU;
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rc->code = bytestream2_get_be32(gb);
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}
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static void reinit_tables(SCPRContext *s)
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{
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int comp, i, j;
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for (comp = 0; comp < 3; comp++) {
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for (j = 0; j < 4096; j++) {
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if (s->pixel_model[comp][j].total_freq != 256) {
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for (i = 0; i < 256; i++)
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s->pixel_model[comp][j].freq[i] = 1;
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for (i = 0; i < 16; i++)
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s->pixel_model[comp][j].lookup[i] = 16;
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s->pixel_model[comp][j].total_freq = 256;
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}
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}
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}
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for (j = 0; j < 6; j++) {
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unsigned *p = s->run_model[j];
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for (i = 0; i < 256; i++)
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p[i] = 1;
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p[256] = 256;
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}
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for (j = 0; j < 6; j++) {
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unsigned *op = s->op_model[j];
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for (i = 0; i < 6; i++)
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op[i] = 1;
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op[6] = 6;
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}
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for (i = 0; i < 256; i++) {
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s->range_model[i] = 1;
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s->count_model[i] = 1;
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}
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s->range_model[256] = 256;
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s->count_model[256] = 256;
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for (i = 0; i < 5; i++) {
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s->fill_model[i] = 1;
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}
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s->fill_model[5] = 5;
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for (j = 0; j < 4; j++) {
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for (i = 0; i < 16; i++) {
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s->sxy_model[j][i] = 1;
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}
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s->sxy_model[j][16] = 16;
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}
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for (i = 0; i < 512; i++) {
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s->mv_model[0][i] = 1;
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s->mv_model[1][i] = 1;
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}
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s->mv_model[0][512] = 512;
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s->mv_model[1][512] = 512;
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}
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static int decode(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq)
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{
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rc->code -= cumFreq * rc->range;
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rc->range *= freq;
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while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
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unsigned byte = bytestream2_get_byte(gb);
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rc->code = (rc->code << 8) | byte;
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rc->range <<= 8;
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}
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return 0;
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}
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static int get_freq(RangeCoder *rc, unsigned total_freq, unsigned *freq)
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{
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if (total_freq == 0)
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return AVERROR_INVALIDDATA;
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rc->range = rc->range / total_freq;
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if (rc->range == 0)
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return AVERROR_INVALIDDATA;
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*freq = rc->code / rc->range;
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return 0;
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}
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static int decode0(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq)
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{
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unsigned t;
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if (total_freq == 0)
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return AVERROR_INVALIDDATA;
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t = rc->range * (uint64_t)cumFreq / total_freq;
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rc->code1 += t + 1;
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rc->range = rc->range * (uint64_t)(freq + cumFreq) / total_freq - (t + 1);
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while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
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unsigned byte = bytestream2_get_byte(gb);
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rc->code = (rc->code << 8) | byte;
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rc->code1 <<= 8;
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rc->range <<= 8;
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}
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return 0;
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}
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static int get_freq0(RangeCoder *rc, unsigned total_freq, unsigned *freq)
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{
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if (rc->range == 0)
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return AVERROR_INVALIDDATA;
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*freq = total_freq * (uint64_t)(rc->code - rc->code1) / rc->range;
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return 0;
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}
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static int decode_value(SCPRContext *s, unsigned *cnt, unsigned maxc, unsigned step, unsigned *rval)
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{
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GetByteContext *gb = &s->gb;
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RangeCoder *rc = &s->rc;
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unsigned totfr = cnt[maxc];
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unsigned value;
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unsigned c = 0, cumfr = 0, cnt_c = 0;
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int i, ret;
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if ((ret = s->get_freq(rc, totfr, &value)) < 0)
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return ret;
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while (c < maxc) {
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cnt_c = cnt[c];
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if (value >= cumfr + cnt_c)
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cumfr += cnt_c;
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else
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break;
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c++;
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}
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if (c >= maxc)
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return AVERROR_INVALIDDATA;
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if ((ret = s->decode(gb, rc, cumfr, cnt_c, totfr)) < 0)
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return ret;
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cnt[c] = cnt_c + step;
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totfr += step;
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if (totfr > BOT) {
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totfr = 0;
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for (i = 0; i < maxc; i++) {
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unsigned nc = (cnt[i] >> 1) + 1;
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cnt[i] = nc;
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totfr += nc;
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}
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}
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cnt[maxc] = totfr;
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*rval = c;
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return 0;
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}
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static int decode_unit(SCPRContext *s, PixelModel *pixel, unsigned step, unsigned *rval)
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{
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GetByteContext *gb = &s->gb;
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RangeCoder *rc = &s->rc;
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unsigned totfr = pixel->total_freq;
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unsigned value, x = 0, cumfr = 0, cnt_x = 0;
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int i, j, ret, c, cnt_c;
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if ((ret = s->get_freq(rc, totfr, &value)) < 0)
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return ret;
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while (x < 16) {
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cnt_x = pixel->lookup[x];
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if (value >= cumfr + cnt_x)
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cumfr += cnt_x;
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else
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break;
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x++;
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}
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c = x * 16;
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cnt_c = 0;
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while (c < 256) {
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cnt_c = pixel->freq[c];
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if (value >= cumfr + cnt_c)
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cumfr += cnt_c;
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else
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break;
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c++;
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}
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if (x >= 16 || c >= 256) {
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return AVERROR_INVALIDDATA;
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}
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if ((ret = s->decode(gb, rc, cumfr, cnt_c, totfr)) < 0)
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return ret;
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pixel->freq[c] = cnt_c + step;
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pixel->lookup[x] = cnt_x + step;
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totfr += step;
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if (totfr > BOT) {
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totfr = 0;
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for (i = 0; i < 256; i++) {
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unsigned nc = (pixel->freq[i] >> 1) + 1;
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pixel->freq[i] = nc;
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totfr += nc;
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}
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for (i = 0; i < 16; i++) {
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unsigned sum = 0;
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unsigned i16_17 = i << 4;
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for (j = 0; j < 16; j++)
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sum += pixel->freq[i16_17 + j];
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pixel->lookup[i] = sum;
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}
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}
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pixel->total_freq = totfr;
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*rval = c & s->cbits;
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return 0;
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}
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static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
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{
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SCPRContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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int cx = 0, cx1 = 0, k = 0, clr = 0;
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int run, r, g, b, off, y = 0, x = 0, z, ret;
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unsigned backstep = linesize - avctx->width;
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const int cxshift = s->cxshift;
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unsigned lx, ly, ptype;
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reinit_tables(s);
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bytestream2_skip(gb, 2);
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init_rangecoder(&s->rc, gb);
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while (k < avctx->width + 1) {
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ret = decode_unit(s, &s->pixel_model[0][cx + cx1], 400, &r);
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if (ret < 0)
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return ret;
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cx1 = (cx << 6) & 0xFC0;
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cx = r >> cxshift;
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ret = decode_unit(s, &s->pixel_model[1][cx + cx1], 400, &g);
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if (ret < 0)
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return ret;
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cx1 = (cx << 6) & 0xFC0;
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cx = g >> cxshift;
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ret = decode_unit(s, &s->pixel_model[2][cx + cx1], 400, &b);
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if (ret < 0)
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return ret;
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cx1 = (cx << 6) & 0xFC0;
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cx = b >> cxshift;
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ret = decode_value(s, s->run_model[0], 256, 400, &run);
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if (ret < 0)
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return ret;
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clr = (b << 16) + (g << 8) + r;
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k += run;
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while (run-- > 0) {
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if (y >= avctx->height)
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return AVERROR_INVALIDDATA;
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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}
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off = -linesize - 1;
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ptype = 0;
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while (x < avctx->width && y < avctx->height) {
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ret = decode_value(s, s->op_model[ptype], 6, 1000, &ptype);
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if (ret < 0)
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return ret;
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if (ptype == 0) {
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ret = decode_unit(s, &s->pixel_model[0][cx + cx1], 400, &r);
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if (ret < 0)
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return ret;
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cx1 = (cx << 6) & 0xFC0;
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cx = r >> cxshift;
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ret = decode_unit(s, &s->pixel_model[1][cx + cx1], 400, &g);
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if (ret < 0)
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return ret;
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cx1 = (cx << 6) & 0xFC0;
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cx = g >> cxshift;
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ret = decode_unit(s, &s->pixel_model[2][cx + cx1], 400, &b);
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if (ret < 0)
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return ret;
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clr = (b << 16) + (g << 8) + r;
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}
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if (ptype > 5)
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return AVERROR_INVALIDDATA;
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ret = decode_value(s, s->run_model[ptype], 256, 400, &run);
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if (ret < 0)
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return ret;
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switch (ptype) {
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case 0:
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while (run-- > 0) {
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if (y >= avctx->height)
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return AVERROR_INVALIDDATA;
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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break;
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case 1:
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while (run-- > 0) {
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if (y >= avctx->height)
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return AVERROR_INVALIDDATA;
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dst[y * linesize + x] = dst[ly * linesize + lx];
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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clr = dst[ly * linesize + lx];
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break;
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case 2:
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while (run-- > 0) {
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if (y < 1 || y >= avctx->height)
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return AVERROR_INVALIDDATA;
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clr = dst[y * linesize + x + off + 1];
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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break;
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case 4:
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while (run-- > 0) {
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uint8_t *odst = (uint8_t *)dst;
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if (y < 1 || y >= avctx->height ||
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(y == 1 && x == 0))
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return AVERROR_INVALIDDATA;
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if (x == 0) {
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z = backstep;
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} else {
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z = 0;
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}
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r = odst[(ly * linesize + lx) * 4] +
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odst[((y * linesize + x) + off) * 4 + 4] -
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odst[((y * linesize + x) + off - z) * 4];
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g = odst[(ly * linesize + lx) * 4 + 1] +
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odst[((y * linesize + x) + off) * 4 + 5] -
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odst[((y * linesize + x) + off - z) * 4 + 1];
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b = odst[(ly * linesize + lx) * 4 + 2] +
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odst[((y * linesize + x) + off) * 4 + 6] -
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odst[((y * linesize + x) + off - z) * 4 + 2];
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clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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break;
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case 5:
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while (run-- > 0) {
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if (y < 1 || y >= avctx->height ||
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(y == 1 && x == 0))
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return AVERROR_INVALIDDATA;
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if (x == 0) {
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z = backstep;
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} else {
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z = 0;
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}
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clr = dst[y * linesize + x + off - z];
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dst[y * linesize + x] = clr;
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lx = x;
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ly = y;
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x++;
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if (x >= avctx->width) {
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x = 0;
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y++;
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}
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}
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break;
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}
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if (avctx->bits_per_coded_sample == 16) {
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cx1 = (clr & 0x3F00) >> 2;
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cx = (clr & 0x3FFFFF) >> 16;
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} else {
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cx1 = (clr & 0xFC00) >> 4;
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cx = (clr & 0xFFFFFF) >> 18;
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}
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}
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return 0;
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}
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static int decompress_p(AVCodecContext *avctx,
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uint32_t *dst, int linesize,
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uint32_t *prev, int plinesize)
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{
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SCPRContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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int ret, temp, min, max, x, y, cx = 0, cx1 = 0;
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int backstep = linesize - avctx->width;
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const int cxshift = s->cxshift;
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if (bytestream2_get_byte(gb) == 0)
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return 0;
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bytestream2_skip(gb, 1);
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init_rangecoder(&s->rc, gb);
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ret = decode_value(s, s->range_model, 256, 1, &min);
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ret |= decode_value(s, s->range_model, 256, 1, &temp);
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min += temp << 8;
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ret |= decode_value(s, s->range_model, 256, 1, &max);
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ret |= decode_value(s, s->range_model, 256, 1, &temp);
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if (ret < 0)
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return ret;
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max += temp << 8;
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memset(s->blocks, 0, sizeof(*s->blocks) * s->nbcount);
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while (min <= max) {
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int fill, count;
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ret = decode_value(s, s->fill_model, 5, 10, &fill);
|
|
ret |= decode_value(s, s->count_model, 256, 20, &count);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
while (min < s->nbcount && count-- > 0) {
|
|
s->blocks[min++] = fill;
|
|
}
|
|
}
|
|
|
|
for (y = 0; y < s->nby; y++) {
|
|
for (x = 0; x < s->nbx; x++) {
|
|
int sy1 = 0, sy2 = 16, sx1 = 0, sx2 = 16;
|
|
|
|
if (s->blocks[y * s->nbx + x] == 0)
|
|
continue;
|
|
|
|
if (((s->blocks[y * s->nbx + x] - 1) & 1) > 0) {
|
|
ret = decode_value(s, s->sxy_model[0], 16, 100, &sx1);
|
|
ret |= decode_value(s, s->sxy_model[1], 16, 100, &sy1);
|
|
ret |= decode_value(s, s->sxy_model[2], 16, 100, &sx2);
|
|
ret |= decode_value(s, s->sxy_model[3], 16, 100, &sy2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
sx2++;
|
|
sy2++;
|
|
}
|
|
if (((s->blocks[y * s->nbx + x] - 1) & 2) > 0) {
|
|
int i, j, by = y * 16, bx = x * 16;
|
|
int mvx, mvy;
|
|
|
|
ret = decode_value(s, s->mv_model[0], 512, 100, &mvx);
|
|
ret |= decode_value(s, s->mv_model[1], 512, 100, &mvy);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
mvx -= 256;
|
|
mvy -= 256;
|
|
|
|
if (by + mvy + sy1 < 0 || bx + mvx + sx1 < 0 ||
|
|
by + mvy + sy1 >= avctx->height || bx + mvx + sx1 >= avctx->width)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (i = 0; i < sy2 - sy1 && (by + sy1 + i) < avctx->height && (by + mvy + sy1 + i) < avctx->height; i++) {
|
|
for (j = 0; j < sx2 - sx1 && (bx + sx1 + j) < avctx->width && (bx + mvx + sx1 + j) < avctx->width; j++) {
|
|
dst[(by + i + sy1) * linesize + bx + sx1 + j] = prev[(by + mvy + sy1 + i) * plinesize + bx + sx1 + mvx + j];
|
|
}
|
|
}
|
|
} else {
|
|
int run, r, g, b, z, bx = x * 16 + sx1, by = y * 16 + sy1;
|
|
unsigned clr, ptype = 0;
|
|
|
|
for (; by < y * 16 + sy2 && by < avctx->height;) {
|
|
ret = decode_value(s, s->op_model[ptype], 6, 1000, &ptype);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ptype == 0) {
|
|
ret = decode_unit(s, &s->pixel_model[0][cx + cx1], 400, &r);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
cx1 = (cx << 6) & 0xFC0;
|
|
cx = r >> cxshift;
|
|
ret = decode_unit(s, &s->pixel_model[1][cx + cx1], 400, &g);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
cx1 = (cx << 6) & 0xFC0;
|
|
cx = g >> cxshift;
|
|
ret = decode_unit(s, &s->pixel_model[2][cx + cx1], 400, &b);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
clr = (b << 16) + (g << 8) + r;
|
|
}
|
|
if (ptype > 5)
|
|
return AVERROR_INVALIDDATA;
|
|
ret = decode_value(s, s->run_model[ptype], 256, 400, &run);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
switch (ptype) {
|
|
case 0:
|
|
while (run-- > 0) {
|
|
if (by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
case 1:
|
|
while (run-- > 0) {
|
|
if (bx == 0) {
|
|
if (by < 1)
|
|
return AVERROR_INVALIDDATA;
|
|
z = backstep;
|
|
} else {
|
|
z = 0;
|
|
}
|
|
|
|
if (by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
clr = dst[by * linesize + bx - 1 - z];
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
case 2:
|
|
while (run-- > 0) {
|
|
if (by < 1 || by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
clr = dst[(by - 1) * linesize + bx];
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
case 3:
|
|
while (run-- > 0) {
|
|
if (by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
clr = prev[by * plinesize + bx];
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
case 4:
|
|
while (run-- > 0) {
|
|
uint8_t *odst = (uint8_t *)dst;
|
|
|
|
if (by < 1 || by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (bx == 0) {
|
|
if (by < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
z = backstep;
|
|
} else {
|
|
z = 0;
|
|
}
|
|
|
|
r = odst[((by - 1) * linesize + bx) * 4] +
|
|
odst[(by * linesize + bx - 1 - z) * 4] -
|
|
odst[((by - 1) * linesize + bx - 1 - z) * 4];
|
|
g = odst[((by - 1) * linesize + bx) * 4 + 1] +
|
|
odst[(by * linesize + bx - 1 - z) * 4 + 1] -
|
|
odst[((by - 1) * linesize + bx - 1 - z) * 4 + 1];
|
|
b = odst[((by - 1) * linesize + bx) * 4 + 2] +
|
|
odst[(by * linesize + bx - 1 - z) * 4 + 2] -
|
|
odst[((by - 1) * linesize + bx - 1 - z) * 4 + 2];
|
|
clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
case 5:
|
|
while (run-- > 0) {
|
|
if (by < 1 || by >= avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (bx == 0) {
|
|
if (by < 2)
|
|
return AVERROR_INVALIDDATA;
|
|
z = backstep;
|
|
} else {
|
|
z = 0;
|
|
}
|
|
|
|
clr = dst[(by - 1) * linesize + bx - 1 - z];
|
|
dst[by * linesize + bx] = clr;
|
|
bx++;
|
|
if (bx >= x * 16 + sx2 || bx >= avctx->width) {
|
|
bx = x * 16 + sx1;
|
|
by++;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (avctx->bits_per_coded_sample == 16) {
|
|
cx1 = (clr & 0x3F00) >> 2;
|
|
cx = (clr & 0x3FFFFF) >> 16;
|
|
} else {
|
|
cx1 = (clr & 0xFC00) >> 4;
|
|
cx = (clr & 0xFFFFFF) >> 18;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
SCPRContext *s = avctx->priv_data;
|
|
GetByteContext *gb = &s->gb;
|
|
AVFrame *frame = data;
|
|
int ret, type;
|
|
|
|
if (avctx->bits_per_coded_sample == 16) {
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
|
|
return ret;
|
|
|
|
bytestream2_init(gb, avpkt->data, avpkt->size);
|
|
|
|
type = bytestream2_peek_byte(gb);
|
|
|
|
if (type == 2) {
|
|
s->get_freq = get_freq0;
|
|
s->decode = decode0;
|
|
frame->key_frame = 1;
|
|
ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
|
|
s->current_frame->linesize[0] / 4);
|
|
} else if (type == 18) {
|
|
s->get_freq = get_freq;
|
|
s->decode = decode;
|
|
frame->key_frame = 1;
|
|
ret = decompress_i(avctx, (uint32_t *)s->current_frame->data[0],
|
|
s->current_frame->linesize[0] / 4);
|
|
} else if (type == 17) {
|
|
uint32_t clr, *dst = (uint32_t *)s->current_frame->data[0];
|
|
int x, y;
|
|
|
|
frame->key_frame = 1;
|
|
bytestream2_skip(gb, 1);
|
|
if (avctx->bits_per_coded_sample == 16) {
|
|
uint16_t value = bytestream2_get_le16(gb);
|
|
int r, g, b;
|
|
|
|
r = (value ) & 31;
|
|
g = (value >> 5) & 31;
|
|
b = (value >> 10) & 31;
|
|
clr = (r << 16) + (g << 8) + b;
|
|
} else {
|
|
clr = bytestream2_get_le24(gb);
|
|
}
|
|
for (y = 0; y < avctx->height; y++) {
|
|
for (x = 0; x < avctx->width; x++) {
|
|
dst[x] = clr;
|
|
}
|
|
dst += s->current_frame->linesize[0] / 4;
|
|
}
|
|
} else if (type == 0 || type == 1) {
|
|
frame->key_frame = 0;
|
|
|
|
ret = av_frame_copy(s->current_frame, s->last_frame);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = decompress_p(avctx, (uint32_t *)s->current_frame->data[0],
|
|
s->current_frame->linesize[0] / 4,
|
|
(uint32_t *)s->last_frame->data[0],
|
|
s->last_frame->linesize[0] / 4);
|
|
} else {
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (avctx->bits_per_coded_sample != 16) {
|
|
ret = av_frame_ref(data, s->current_frame);
|
|
if (ret < 0)
|
|
return ret;
|
|
} else {
|
|
uint8_t *dst = frame->data[0];
|
|
int x, y;
|
|
|
|
ret = av_frame_copy(frame, s->current_frame);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
// scale up each sample by 8
|
|
for (y = 0; y < avctx->height; y++) {
|
|
// If the image is sufficiently aligned, compute 8 samples at once
|
|
if (!(((uintptr_t)dst) & 7)) {
|
|
uint64_t *dst64 = (uint64_t *)dst;
|
|
int w = avctx->width>>1;
|
|
for (x = 0; x < w; x++) {
|
|
dst64[x] = (dst64[x] << 3) & 0xFCFCFCFCFCFCFCFCULL;
|
|
}
|
|
x *= 8;
|
|
} else
|
|
x = 0;
|
|
for (; x < avctx->width * 4; x++) {
|
|
dst[x] = dst[x] << 3;
|
|
}
|
|
dst += frame->linesize[0];
|
|
}
|
|
}
|
|
|
|
frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
|
|
|
FFSWAP(AVFrame *, s->current_frame, s->last_frame);
|
|
|
|
frame->data[0] += frame->linesize[0] * (avctx->height - 1);
|
|
frame->linesize[0] *= -1;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
SCPRContext *s = avctx->priv_data;
|
|
|
|
switch (avctx->bits_per_coded_sample) {
|
|
case 16: avctx->pix_fmt = AV_PIX_FMT_RGB0; break;
|
|
case 24:
|
|
case 32: avctx->pix_fmt = AV_PIX_FMT_BGR0; break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
s->get_freq = get_freq0;
|
|
s->decode = decode0;
|
|
|
|
s->cxshift = avctx->bits_per_coded_sample == 16 ? 0 : 2;
|
|
s->cbits = avctx->bits_per_coded_sample == 16 ? 0x1F : 0xFF;
|
|
s->nbx = (avctx->width + 15) / 16;
|
|
s->nby = (avctx->height + 15) / 16;
|
|
s->nbcount = s->nbx * s->nby;
|
|
s->blocks = av_malloc_array(s->nbcount, sizeof(*s->blocks));
|
|
if (!s->blocks)
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->last_frame = av_frame_alloc();
|
|
s->current_frame = av_frame_alloc();
|
|
if (!s->last_frame || !s->current_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
SCPRContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->blocks);
|
|
av_frame_free(&s->last_frame);
|
|
av_frame_free(&s->current_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_scpr_decoder = {
|
|
.name = "scpr",
|
|
.long_name = NULL_IF_CONFIG_SMALL("ScreenPressor"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_SCPR,
|
|
.priv_data_size = sizeof(SCPRContext),
|
|
.init = decode_init,
|
|
.close = decode_close,
|
|
.decode = decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
|
|
FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|