2006-01-09 15:41:39 +00:00
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/*
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* CamStudio decoder
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* Copyright (c) 2006 Reimar Doeffinger
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*
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2006-10-07 15:30:46 +00:00
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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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2006-01-09 15:41:39 +00:00
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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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2006-10-07 15:30:46 +00:00
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* version 2.1 of the License, or (at your option) any later version.
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2006-01-09 15:41:39 +00:00
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*
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2006-10-07 15:30:46 +00:00
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* FFmpeg is distributed in the hope that it will be useful,
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2006-01-09 15:41:39 +00:00
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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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2006-10-07 15:30:46 +00:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 22:43:26 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2006-01-09 15:41:39 +00:00
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*/
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#include "avcodec.h"
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2022-03-16 17:18:28 +00:00
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#include "codec_internal.h"
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2022-08-24 18:49:25 +00:00
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#include "decode.h"
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2012-08-06 13:49:32 +00:00
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#include "libavutil/common.h"
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2006-01-09 15:41:39 +00:00
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2009-01-13 23:44:16 +00:00
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#if CONFIG_ZLIB
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2006-01-09 15:41:39 +00:00
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#include <zlib.h>
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#endif
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2008-05-09 11:56:36 +00:00
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#include "libavutil/lzo.h"
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2006-01-09 15:41:39 +00:00
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2014-09-22 09:01:31 +00:00
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typedef struct CamStudioContext {
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2013-03-12 02:20:18 +00:00
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AVFrame *pic;
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2006-01-09 15:41:39 +00:00
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int linelen, height, bpp;
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unsigned int decomp_size;
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unsigned char* decomp_buf;
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} CamStudioContext;
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2012-04-29 16:35:39 +00:00
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static void copy_frame_default(AVFrame *f, const uint8_t *src,
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2018-09-08 18:09:27 +00:00
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int linelen, int height)
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{
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2012-04-29 16:35:39 +00:00
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int i, src_stride = FFALIGN(linelen, 4);
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2006-01-09 15:41:39 +00:00
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uint8_t *dst = f->data[0];
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dst += (height - 1) * f->linesize[0];
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for (i = height; i; i--) {
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memcpy(dst, src, linelen);
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2010-09-10 17:33:31 +00:00
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src += src_stride;
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2006-01-09 15:41:39 +00:00
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dst -= f->linesize[0];
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}
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}
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2012-04-29 16:35:39 +00:00
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static void add_frame_default(AVFrame *f, const uint8_t *src,
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2018-09-08 18:09:27 +00:00
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int linelen, int height)
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{
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2012-04-29 16:35:39 +00:00
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int i, j, src_stride = FFALIGN(linelen, 4);
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2006-01-09 15:41:39 +00:00
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uint8_t *dst = f->data[0];
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dst += (height - 1) * f->linesize[0];
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for (i = height; i; i--) {
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for (j = linelen; j; j--)
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*dst++ += *src++;
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2010-09-10 17:33:31 +00:00
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src += src_stride - linelen;
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2006-01-09 15:41:39 +00:00
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dst -= f->linesize[0] + linelen;
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}
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}
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2022-03-30 19:33:24 +00:00
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static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
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int *got_frame, AVPacket *avpkt)
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2018-09-08 18:09:27 +00:00
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{
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2009-04-07 15:59:50 +00:00
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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2007-04-08 20:24:16 +00:00
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CamStudioContext *c = avctx->priv_data;
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2012-11-17 14:45:41 +00:00
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int ret;
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2006-01-09 15:41:39 +00:00
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if (buf_size < 2) {
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av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
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2012-11-17 14:45:41 +00:00
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return AVERROR_INVALIDDATA;
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2006-01-09 15:41:39 +00:00
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}
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2019-08-30 14:37:25 +00:00
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if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
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2012-11-17 14:45:41 +00:00
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return ret;
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2006-01-09 15:41:39 +00:00
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// decompress data
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switch ((buf[0] >> 1) & 7) {
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2018-09-08 18:09:27 +00:00
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case 0: { // lzo compression
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int outlen = c->decomp_size, inlen = buf_size - 2;
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if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen) || outlen) {
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av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
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return AVERROR_INVALIDDATA;
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2006-01-09 15:41:39 +00:00
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}
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2018-09-08 18:09:27 +00:00
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break;
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}
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case 1: { // zlib compression
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2009-01-13 23:44:16 +00:00
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#if CONFIG_ZLIB
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2018-09-08 18:09:27 +00:00
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unsigned long dlen = c->decomp_size;
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2020-11-11 22:17:50 +00:00
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if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK || dlen != c->decomp_size) {
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2018-09-08 18:09:27 +00:00
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av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
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return AVERROR_INVALIDDATA;
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}
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break;
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2006-01-09 15:41:39 +00:00
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#else
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2018-09-08 18:09:27 +00:00
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av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
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return AVERROR(ENOSYS);
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2006-01-09 15:41:39 +00:00
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#endif
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2018-09-08 18:09:27 +00:00
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}
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default:
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av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
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return AVERROR_INVALIDDATA;
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2006-01-09 15:41:39 +00:00
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}
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// flip upside down, add difference frame
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if (buf[0] & 1) { // keyframe
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2013-03-12 02:20:18 +00:00
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c->pic->pict_type = AV_PICTURE_TYPE_I;
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2023-04-12 16:58:54 +00:00
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c->pic->flags |= AV_FRAME_FLAG_KEY;
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2013-03-12 02:20:18 +00:00
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copy_frame_default(c->pic, c->decomp_buf,
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2010-09-10 17:33:31 +00:00
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c->linelen, c->height);
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2006-01-09 15:41:39 +00:00
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} else {
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2013-03-12 02:20:18 +00:00
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c->pic->pict_type = AV_PICTURE_TYPE_P;
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2023-04-12 16:58:54 +00:00
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c->pic->flags &= ~AV_FRAME_FLAG_KEY;
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2013-03-12 02:20:18 +00:00
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add_frame_default(c->pic, c->decomp_buf,
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2010-09-10 17:33:31 +00:00
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c->linelen, c->height);
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2006-01-09 15:41:39 +00:00
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}
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2012-11-13 18:35:22 +00:00
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*got_frame = 1;
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2022-03-30 19:33:24 +00:00
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if ((ret = av_frame_ref(rframe, c->pic)) < 0)
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2013-03-12 02:20:18 +00:00
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return ret;
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2006-01-09 15:41:39 +00:00
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return buf_size;
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}
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2018-09-08 18:09:27 +00:00
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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2007-04-08 20:24:16 +00:00
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CamStudioContext *c = avctx->priv_data;
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2010-09-10 17:33:31 +00:00
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int stride;
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2008-09-08 14:24:59 +00:00
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switch (avctx->bits_per_coded_sample) {
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2018-09-08 18:09:27 +00:00
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case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break;
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case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
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case 32: avctx->pix_fmt = AV_PIX_FMT_BGR0; break;
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default:
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av_log(avctx, AV_LOG_ERROR,
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"CamStudio codec error: invalid depth %i bpp\n",
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avctx->bits_per_coded_sample);
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return AVERROR_INVALIDDATA;
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2006-01-09 15:41:39 +00:00
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}
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2008-09-08 14:24:59 +00:00
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c->bpp = avctx->bits_per_coded_sample;
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c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
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2006-01-09 15:41:39 +00:00
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c->height = avctx->height;
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2012-04-29 16:35:39 +00:00
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stride = FFALIGN(c->linelen, 4);
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2010-09-10 17:33:31 +00:00
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c->decomp_size = c->height * stride;
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2009-02-02 20:16:00 +00:00
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c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
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2006-01-09 15:41:39 +00:00
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if (!c->decomp_buf) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
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2012-02-29 21:55:09 +00:00
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return AVERROR(ENOMEM);
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2006-01-09 15:41:39 +00:00
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}
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2013-03-12 02:20:18 +00:00
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c->pic = av_frame_alloc();
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if (!c->pic)
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return AVERROR(ENOMEM);
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2006-01-09 15:41:39 +00:00
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return 0;
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}
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2018-09-08 18:09:27 +00:00
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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2007-04-08 20:24:16 +00:00
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CamStudioContext *c = avctx->priv_data;
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2006-01-09 15:41:39 +00:00
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av_freep(&c->decomp_buf);
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2013-03-12 02:20:18 +00:00
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av_frame_free(&c->pic);
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2006-01-09 15:41:39 +00:00
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return 0;
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}
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2022-03-16 20:09:54 +00:00
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const FFCodec ff_cscd_decoder = {
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.p.name = "camstudio",
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2022-08-29 11:38:02 +00:00
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CODEC_LONG_NAME("CamStudio"),
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2022-03-16 20:09:54 +00:00
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_CSCD,
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2011-07-17 10:54:31 +00:00
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.priv_data_size = sizeof(CamStudioContext),
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.init = decode_init,
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.close = decode_end,
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2022-03-30 21:28:24 +00:00
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FF_CODEC_DECODE_CB(decode_frame),
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2022-03-16 20:09:54 +00:00
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.p.capabilities = AV_CODEC_CAP_DR1,
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2022-07-09 22:05:45 +00:00
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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2006-01-09 15:41:39 +00:00
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};
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