3 * Copyright (c) 2006 Reimar Doeffinger
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
32 int linelen, height, bpp;
33 unsigned int decomp_size;
34 unsigned char* decomp_buf;
37 static void copy_frame_default(AVFrame *f, uint8_t *src,
38 int linelen, int height) {
40 uint8_t *dst = f->data[0];
41 dst += (height - 1) * f->linesize[0];
42 for (i = height; i; i--) {
43 memcpy(dst, src, linelen);
45 dst -= f->linesize[0];
49 static void add_frame_default(AVFrame *f, uint8_t *src,
50 int linelen, int height) {
52 uint8_t *dst = f->data[0];
53 dst += (height - 1) * f->linesize[0];
54 for (i = height; i; i--) {
55 for (j = linelen; j; j--)
57 dst -= f->linesize[0] + linelen;
61 #ifndef WORDS_BIGENDIAN
62 #define copy_frame_16 copy_frame_default
63 #define copy_frame_32 copy_frame_default
64 #define add_frame_16 add_frame_default
65 #define add_frame_32 add_frame_default
67 static void copy_frame_16(AVFrame *f, uint8_t *src,
68 int linelen, int height) {
70 uint8_t *dst = f->data[0];
71 dst += (height - 1) * f->linesize[0];
72 for (i = height; i; i--) {
73 for (j = linelen / 2; j; j--) {
79 dst -= f->linesize[0] + linelen;
83 static void copy_frame_32(AVFrame *f, uint8_t *src,
84 int linelen, int height) {
86 uint8_t *dst = f->data[0];
87 dst += (height - 1) * f->linesize[0];
88 for (i = height; i; i--) {
89 for (j = linelen / 4; j; j--) {
97 dst -= f->linesize[0] + linelen;
101 static void add_frame_16(AVFrame *f, uint8_t *src,
102 int linelen, int height) {
104 uint8_t *dst = f->data[0];
105 dst += (height - 1) * f->linesize[0];
106 for (i = height; i; i--) {
107 for (j = linelen / 2; j; j--) {
113 dst -= f->linesize[0] + linelen;
117 static void add_frame_32(AVFrame *f, uint8_t *src,
118 int linelen, int height) {
120 uint8_t *dst = f->data[0];
121 dst += (height - 1) * f->linesize[0];
122 for (i = height; i; i--) {
123 for (j = linelen / 4; j; j--) {
131 dst -= f->linesize[0] + linelen;
136 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
137 uint8_t *buf, int buf_size) {
138 CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
139 AVFrame *picture = data;
142 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
147 avctx->release_buffer(avctx, &c->pic);
148 c->pic.reference = 1;
149 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
150 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
151 if (avctx->get_buffer(avctx, &c->pic) < 0) {
152 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
157 switch ((buf[0] >> 1) & 7) {
158 case 0: { // lzo compression
159 int outlen = c->decomp_size, inlen = buf_size - 2;
160 if (lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
161 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
164 case 1: { // zlib compression
166 unsigned long dlen = c->decomp_size;
167 if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
168 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
171 av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
176 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
180 // flip upside down, add difference frame
181 if (buf[0] & 1) { // keyframe
182 c->pic.pict_type = FF_I_TYPE;
183 c->pic.key_frame = 1;
186 copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
189 copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
192 copy_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
195 c->pic.pict_type = FF_P_TYPE;
196 c->pic.key_frame = 0;
199 add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
202 add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
205 add_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
210 *data_size = sizeof(AVFrame);
214 static int decode_init(AVCodecContext *avctx) {
215 CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
216 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
219 avctx->has_b_frames = 0;
220 switch (avctx->bits_per_sample) {
221 case 16: avctx->pix_fmt = PIX_FMT_RGB565; break;
222 case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
223 case 32: avctx->pix_fmt = PIX_FMT_RGBA32; break;
225 av_log(avctx, AV_LOG_ERROR,
226 "CamStudio codec error: unvalid depth %i bpp\n",
227 avctx->bits_per_sample);
230 c->bpp = avctx->bits_per_sample;
231 c->pic.data[0] = NULL;
232 c->linelen = avctx->width * avctx->bits_per_sample / 8;
233 c->height = avctx->height;
234 c->decomp_size = c->height * c->linelen;
235 c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
236 if (!c->decomp_buf) {
237 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
243 static int decode_end(AVCodecContext *avctx) {
244 CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
245 av_freep(&c->decomp_buf);
247 avctx->release_buffer(avctx, &c->pic);
251 AVCodec cscd_decoder = {
255 sizeof(CamStudioContext),