3 * Copyright (c) 2006 Reimar Doeffinger
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/common.h"
31 #include "libavutil/lzo.h"
35 int linelen, height, bpp;
36 unsigned int decomp_size;
37 unsigned char* decomp_buf;
40 static void copy_frame_default(AVFrame *f, const uint8_t *src,
41 int linelen, int height) {
42 int i, src_stride = FFALIGN(linelen, 4);
43 uint8_t *dst = f->data[0];
44 dst += (height - 1) * f->linesize[0];
45 for (i = height; i; i--) {
46 memcpy(dst, src, linelen);
48 dst -= f->linesize[0];
52 static void add_frame_default(AVFrame *f, const uint8_t *src,
53 int linelen, int height) {
54 int i, j, src_stride = FFALIGN(linelen, 4);
55 uint8_t *dst = f->data[0];
56 dst += (height - 1) * f->linesize[0];
57 for (i = height; i; i--) {
58 for (j = linelen; j; j--)
60 src += src_stride - linelen;
61 dst -= f->linesize[0] + linelen;
65 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
67 const uint8_t *buf = avpkt->data;
68 int buf_size = avpkt->size;
69 CamStudioContext *c = avctx->priv_data;
73 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
74 return AVERROR_INVALIDDATA;
77 if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) {
78 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
83 switch ((buf[0] >> 1) & 7) {
84 case 0: { // lzo compression
85 int outlen = c->decomp_size, inlen = buf_size - 2;
86 if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
87 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
90 case 1: { // zlib compression
92 unsigned long dlen = c->decomp_size;
93 if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
94 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
97 av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
98 return AVERROR(ENOSYS);
102 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
103 return AVERROR_INVALIDDATA;
106 // flip upside down, add difference frame
107 if (buf[0] & 1) { // keyframe
108 c->pic->pict_type = AV_PICTURE_TYPE_I;
109 c->pic->key_frame = 1;
110 copy_frame_default(c->pic, c->decomp_buf,
111 c->linelen, c->height);
113 c->pic->pict_type = AV_PICTURE_TYPE_P;
114 c->pic->key_frame = 0;
115 add_frame_default(c->pic, c->decomp_buf,
116 c->linelen, c->height);
120 if ((ret = av_frame_ref(data, c->pic)) < 0)
126 static av_cold int decode_init(AVCodecContext *avctx) {
127 CamStudioContext *c = avctx->priv_data;
129 switch (avctx->bits_per_coded_sample) {
130 case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break;
131 case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
132 case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
134 av_log(avctx, AV_LOG_ERROR,
135 "CamStudio codec error: invalid depth %i bpp\n",
136 avctx->bits_per_coded_sample);
137 return AVERROR_INVALIDDATA;
139 c->bpp = avctx->bits_per_coded_sample;
140 c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
141 c->height = avctx->height;
142 stride = FFALIGN(c->linelen, 4);
143 c->decomp_size = c->height * stride;
144 c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
145 if (!c->decomp_buf) {
146 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
147 return AVERROR(ENOMEM);
149 c->pic = av_frame_alloc();
151 return AVERROR(ENOMEM);
155 static av_cold int decode_end(AVCodecContext *avctx) {
156 CamStudioContext *c = avctx->priv_data;
157 av_freep(&c->decomp_buf);
158 av_frame_free(&c->pic);
162 AVCodec ff_cscd_decoder = {
164 .type = AVMEDIA_TYPE_VIDEO,
165 .id = AV_CODEC_ID_CSCD,
166 .priv_data_size = sizeof(CamStudioContext),
169 .decode = decode_frame,
170 .capabilities = CODEC_CAP_DR1,
171 .long_name = NULL_IF_CONFIG_SMALL("CamStudio"),