* TechSmith Camtasia decoder
* Copyright (c) 2004 Konstantin Shishkov
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* only without padding and with greater pixel sizes,
* then this coded picture is packed with ZLib
*
- * Supports: BGR8,BGR555,BGR24 - only BGR555 tested
+ * Supports: BGR8,BGR555,BGR24 - only BGR8 and BGR555 tested
*
*/
#include <stdio.h>
#include <stdlib.h>
-#include "common.h"
#include "avcodec.h"
#ifdef CONFIG_ZLIB
* and enhanced to bigger color depths
*
*/
-
-static int decode_rle(CamtasiaContext *c)
+
+static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
{
unsigned char *src = c->decomp_buf;
- unsigned char *output = c->pic.data[0];
+ unsigned char *output, *output_end;
int p1, p2, line=c->height, pos=0, i;
- while(src < c->decomp_buf + c->decomp_size) {
+ uint16_t pix16;
+ uint32_t pix32;
+
+ output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
+ output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
+ while(src < c->decomp_buf + srcsize) {
p1 = *src++;
if(p1 == 0) { //Escape code
p2 = *src++;
if(p2 == 0) { //End-of-line
output = c->pic.data[0] + (--line) * c->pic.linesize[0];
+ if (line < 0)
+ return -1;
pos = 0;
continue;
} else if(p2 == 1) { //End-of-picture
p1 = *src++;
p2 = *src++;
line -= p2;
+ if (line < 0)
+ return -1;
pos += p1;
output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
continue;
}
// Copy data
- for(i = 0; i < p2 * (c->bpp / 8); i++) {
- *output++ = *src++;
+ if (output + p2 * (c->bpp / 8) > output_end) {
+ src += p2 * (c->bpp / 8);
+ continue;
+ }
+ if ((c->bpp == 8) || (c->bpp == 24)) {
+ for(i = 0; i < p2 * (c->bpp / 8); i++) {
+ *output++ = *src++;
+ }
+ // RLE8 copy is actually padded - and runs are not!
+ if(c->bpp == 8 && (p2 & 1)) {
+ src++;
+ }
+ } else if (c->bpp == 16) {
+ for(i = 0; i < p2; i++) {
+ pix16 = AV_RL16(src);
+ src += 2;
+ *(uint16_t*)output = pix16;
+ output += 2;
+ }
+ } else if (c->bpp == 32) {
+ for(i = 0; i < p2; i++) {
+ pix32 = AV_RL32(src);
+ src += 4;
+ *(uint32_t*)output = pix32;
+ output += 4;
+ }
}
pos += p2;
} else { //Run of pixels
- int pix[3]; //original pixel
+ int pix[4]; //original pixel
switch(c->bpp){
case 8: pix[0] = *src++;
break;
- case 16: pix[0] = *src++;
- pix[1] = *src++;
+ case 16: pix16 = AV_RL16(src);
+ src += 2;
+ *(uint16_t*)pix = pix16;
break;
case 24: pix[0] = *src++;
pix[1] = *src++;
pix[2] = *src++;
break;
+ case 32: pix32 = AV_RL32(src);
+ src += 4;
+ *(uint32_t*)pix = pix32;
+ break;
}
+ if (output + p1 * (c->bpp / 8) > output_end)
+ continue;
for(i = 0; i < p1; i++) {
switch(c->bpp){
case 8: *output++ = pix[0];
break;
- case 16: *output++ = pix[0];
- *output++ = pix[1];
+ case 16: *(uint16_t*)output = pix16;
+ output += 2;
break;
case 24: *output++ = pix[0];
*output++ = pix[1];
*output++ = pix[2];
break;
+ case 32: *(uint32_t*)output = pix32;
+ output += 4;
+ break;
}
}
pos += p1;
}
}
-
- av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
+
+ av_log(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
return 1;
}
* Decode a frame
*
*/
-static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
{
- CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
- unsigned char *encoded = (unsigned char *)buf;
+ CamtasiaContext * const c = avctx->priv_data;
+ const unsigned char *encoded = buf;
unsigned char *outptr;
#ifdef CONFIG_ZLIB
int zret; // Zlib return code
#endif
int len = buf_size;
- /* no supplementary picture */
- if (buf_size == 0)
- return 0;
-
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
return -1;
}
- encoded = c->decomp_buf;
- len = c->decomp_size;
+
+
if(zret != Z_DATA_ERROR)
- decode_rle(c);
+ decode_rle(c, c->zstream.avail_out);
+
+ /* make the palette available on the way out */
+ if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
+ memcpy(c->pic.data[1], c->avctx->palctrl->palette, AVPALETTE_SIZE);
+ if (c->avctx->palctrl->palette_changed) {
+ c->pic.palette_has_changed = 1;
+ c->avctx->palctrl->palette_changed = 0;
+ }
+ }
+
#else
av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
return -1;
* Init tscc decoder
*
*/
-static int decode_init(AVCodecContext *avctx)
+static av_cold int decode_init(AVCodecContext *avctx)
{
- CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
+ CamtasiaContext * const c = avctx->priv_data;
int zret; // Zlib return code
c->avctx = avctx;
- avctx->has_b_frames = 0;
c->pic.data[0] = NULL;
c->height = avctx->height;
+ if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
+ return 1;
+ }
+
#ifdef CONFIG_ZLIB
// Needed if zlib unused or init aborted before inflateInit
- memset(&(c->zstream), 0, sizeof(z_stream));
+ memset(&(c->zstream), 0, sizeof(z_stream));
#else
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
return 1;
#endif
switch(avctx->bits_per_sample){
- case 8: av_log(avctx, AV_LOG_ERROR, "Camtasia warning: RGB8 is just guessed\n");
- avctx->pix_fmt = PIX_FMT_PAL8;
- break;
- case 16: avctx->pix_fmt = PIX_FMT_RGB555;break;
- case 24: av_log(avctx, AV_LOG_ERROR, "Camtasia warning: RGB24 is just guessed\n");
+ case 8: avctx->pix_fmt = PIX_FMT_PAL8; break;
+ case 16: avctx->pix_fmt = PIX_FMT_RGB555; break;
+ case 24:
avctx->pix_fmt = PIX_FMT_BGR24;
break;
+ case 32: avctx->pix_fmt = PIX_FMT_RGB32; break;
default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i bpp\n", avctx->bits_per_sample);
- return -1;
+ return -1;
}
c->bpp = avctx->bits_per_sample;
- av_log(avctx, AV_LOG_INFO, "bpp=%i \n\n\n", c->bpp);
- c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;//RLE in the best case
+ c->decomp_size = (avctx->width * c->bpp + (avctx->width + 254) / 255 + 2) * avctx->height + 2;//RLE in the 'best' case
/* Allocate decompression buffer */
if (c->decomp_size) {
return 1;
}
}
-
+
#ifdef CONFIG_ZLIB
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
* Uninit tscc decoder
*
*/
-static int decode_end(AVCodecContext *avctx)
+static av_cold int decode_end(AVCodecContext *avctx)
{
- CamtasiaContext * const c = (CamtasiaContext *)avctx->priv_data;
+ CamtasiaContext * const c = avctx->priv_data;
+
+ av_freep(&c->decomp_buf);
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
decode_end,
decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Capture Codec"),
};
projects / ffmpeg / blobdiff