2 * TechSmith Camtasia decoder
3 * Copyright (c) 2004 Konstantin Shishkov
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
25 * TechSmith Camtasia decoder
29 * Codec is very simple:
30 * it codes picture (picture difference, really)
31 * with algorithm almost identical to Windows RLE8,
32 * only without padding and with greater pixel sizes,
33 * then this coded picture is packed with ZLib
35 * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
53 typedef struct TsccContext {
55 AVCodecContext *avctx;
60 // Decompressed data size
61 unsigned int decomp_size;
62 // Decompression buffer
63 unsigned char* decomp_buf;
72 * Decode RLE - almost identical to Windows BMP RLE8
73 * and enhanced to bigger color depths
77 static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
79 unsigned char *src = c->decomp_buf;
80 unsigned char *output, *output_end;
81 int p1, p2, line=c->height, pos=0, i;
85 output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
86 output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
87 while(src < c->decomp_buf + srcsize) {
89 if(p1 == 0) { //Escape code
91 if(p2 == 0) { //End-of-line
92 output = c->pic.data[0] + (--line) * c->pic.linesize[0];
97 } else if(p2 == 1) { //End-of-picture
99 } else if(p2 == 2) { //Skip
106 output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
110 if (output + p2 * (c->bpp / 8) > output_end) {
111 src += p2 * (c->bpp / 8);
114 if ((c->bpp == 8) || (c->bpp == 24)) {
115 for(i = 0; i < p2 * (c->bpp / 8); i++) {
118 // RLE8 copy is actually padded - and runs are not!
119 if(c->bpp == 8 && (p2 & 1)) {
122 } else if (c->bpp == 16) {
123 for(i = 0; i < p2; i++) {
124 pix16 = AV_RL16(src);
126 *(uint16_t*)output = pix16;
129 } else if (c->bpp == 32) {
130 for(i = 0; i < p2; i++) {
131 pix32 = AV_RL32(src);
133 *(uint32_t*)output = pix32;
138 } else { //Run of pixels
139 int pix[4]; //original pixel
141 case 8: pix[0] = *src++;
143 case 16: pix16 = AV_RL16(src);
145 *(uint16_t*)pix = pix16;
147 case 24: pix[0] = *src++;
151 case 32: pix32 = AV_RL32(src);
153 *(uint32_t*)pix = pix32;
156 if (output + p1 * (c->bpp / 8) > output_end)
158 for(i = 0; i < p1; i++) {
160 case 8: *output++ = pix[0];
162 case 16: *(uint16_t*)output = pix16;
165 case 24: *output++ = pix[0];
169 case 32: *(uint32_t*)output = pix32;
178 av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
187 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
189 CamtasiaContext * const c = avctx->priv_data;
190 unsigned char *encoded = (unsigned char *)buf;
191 unsigned char *outptr;
193 int zret; // Zlib return code
198 avctx->release_buffer(avctx, &c->pic);
200 c->pic.reference = 1;
201 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
202 if(avctx->get_buffer(avctx, &c->pic) < 0){
203 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
207 outptr = c->pic.data[0]; // Output image pointer
210 zret = inflateReset(&(c->zstream));
212 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
215 c->zstream.next_in = encoded;
216 c->zstream.avail_in = len;
217 c->zstream.next_out = c->decomp_buf;
218 c->zstream.avail_out = c->decomp_size;
219 zret = inflate(&(c->zstream), Z_FINISH);
220 // Z_DATA_ERROR means empty picture
221 if ((zret != Z_OK) && (zret != Z_STREAM_END) && (zret != Z_DATA_ERROR)) {
222 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
227 if(zret != Z_DATA_ERROR)
228 decode_rle(c, c->zstream.avail_out);
230 /* make the palette available on the way out */
231 if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
232 memcpy(c->pic.data[1], c->avctx->palctrl->palette, AVPALETTE_SIZE);
233 if (c->avctx->palctrl->palette_changed) {
234 c->pic.palette_has_changed = 1;
235 c->avctx->palctrl->palette_changed = 0;
240 av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
244 *data_size = sizeof(AVFrame);
245 *(AVFrame*)data = c->pic;
247 /* always report that the buffer was completely consumed */
258 static int decode_init(AVCodecContext *avctx)
260 CamtasiaContext * const c = avctx->priv_data;
261 int zret; // Zlib return code
265 c->pic.data[0] = NULL;
266 c->height = avctx->height;
268 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
273 // Needed if zlib unused or init aborted before inflateInit
274 memset(&(c->zstream), 0, sizeof(z_stream));
276 av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
279 switch(avctx->bits_per_sample){
280 case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
281 case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
283 avctx->pix_fmt = PIX_FMT_BGR24;
285 case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
286 default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_sample);
289 c->bpp = avctx->bits_per_sample;
290 c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;//RLE in the 'best' case
292 /* Allocate decompression buffer */
293 if (c->decomp_size) {
294 if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
295 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
301 c->zstream.zalloc = Z_NULL;
302 c->zstream.zfree = Z_NULL;
303 c->zstream.opaque = Z_NULL;
304 zret = inflateInit(&(c->zstream));
306 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
318 * Uninit tscc decoder
321 static int decode_end(AVCodecContext *avctx)
323 CamtasiaContext * const c = avctx->priv_data;
325 av_freep(&c->decomp_buf);
328 avctx->release_buffer(avctx, &c->pic);
330 inflateEnd(&(c->zstream));
336 AVCodec tscc_decoder = {
340 sizeof(CamtasiaContext),