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
29 #include "libavutil/lzo.h"
33 int linelen, height, bpp;
34 unsigned int decomp_size;
35 unsigned char* decomp_buf;
38 static void copy_frame_default(AVFrame *f, const uint8_t *src,
39 int linelen, int height) {
40 int i, src_stride = FFALIGN(linelen, 4);
41 uint8_t *dst = f->data[0];
42 dst += (height - 1) * f->linesize[0];
43 for (i = height; i; i--) {
44 memcpy(dst, src, linelen);
46 dst -= f->linesize[0];
50 static void add_frame_default(AVFrame *f, const uint8_t *src,
51 int linelen, int height) {
52 int i, j, src_stride = FFALIGN(linelen, 4);
53 uint8_t *dst = f->data[0];
54 dst += (height - 1) * f->linesize[0];
55 for (i = height; i; i--) {
56 for (j = linelen; j; j--)
58 src += src_stride - linelen;
59 dst -= f->linesize[0] + linelen;
63 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
65 const uint8_t *buf = avpkt->data;
66 int buf_size = avpkt->size;
67 CamStudioContext *c = avctx->priv_data;
68 AVFrame *picture = data;
71 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
76 avctx->release_buffer(avctx, &c->pic);
78 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
79 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
80 if (avctx->get_buffer(avctx, &c->pic) < 0) {
81 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
86 switch ((buf[0] >> 1) & 7) {
87 case 0: { // lzo compression
88 int outlen = c->decomp_size, inlen = buf_size - 2;
89 if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
90 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
93 case 1: { // zlib compression
95 unsigned long dlen = c->decomp_size;
96 if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
97 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
100 av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
105 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
109 // flip upside down, add difference frame
110 if (buf[0] & 1) { // keyframe
111 c->pic.pict_type = AV_PICTURE_TYPE_I;
112 c->pic.key_frame = 1;
113 copy_frame_default(&c->pic, c->decomp_buf,
114 c->linelen, c->height);
116 c->pic.pict_type = AV_PICTURE_TYPE_P;
117 c->pic.key_frame = 0;
118 add_frame_default(&c->pic, c->decomp_buf,
119 c->linelen, c->height);
123 *data_size = sizeof(AVFrame);
127 static av_cold int decode_init(AVCodecContext *avctx) {
128 CamStudioContext *c = avctx->priv_data;
130 switch (avctx->bits_per_coded_sample) {
131 case 16: avctx->pix_fmt = PIX_FMT_RGB555LE; break;
132 case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
133 case 32: avctx->pix_fmt = PIX_FMT_BGRA; break;
135 av_log(avctx, AV_LOG_ERROR,
136 "CamStudio codec error: invalid depth %i bpp\n",
137 avctx->bits_per_coded_sample);
138 return AVERROR_INVALIDDATA;
140 c->bpp = avctx->bits_per_coded_sample;
141 avcodec_get_frame_defaults(&c->pic);
142 c->pic.data[0] = NULL;
143 c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
144 c->height = avctx->height;
145 stride = FFALIGN(c->linelen, 4);
146 c->decomp_size = c->height * stride;
147 c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
148 if (!c->decomp_buf) {
149 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
150 return AVERROR(ENOMEM);
155 static av_cold int decode_end(AVCodecContext *avctx) {
156 CamStudioContext *c = avctx->priv_data;
157 av_freep(&c->decomp_buf);
159 avctx->release_buffer(avctx, &c->pic);
163 AVCodec ff_cscd_decoder = {
165 .type = AVMEDIA_TYPE_VIDEO,
167 .priv_data_size = sizeof(CamStudioContext),
170 .decode = decode_frame,
171 .capabilities = CODEC_CAP_DR1,
172 .long_name = NULL_IF_CONFIG_SMALL("CamStudio"),