* Quicktime Animation (RLE) Video Decoder
* Copyright (C) 2004 the ffmpeg project
*
- * 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
*
*/
*
* The QT RLE decoder has seven modes of operation:
* 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
- * the decoder outputs PAL8 colorspace data. 16-bit data yields RGB24
- * data. 24-bit data is RGB888 and 32-bit data is RGBA32.
+ * the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
+ * data. 24-bit data is RGB24 and 32-bit data is RGBA32.
*/
#include <stdio.h>
} QtrleContext;
-#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
-
#define CHECK_STREAM_PTR(n) \
if ((stream_ptr + n) > s->size) { \
av_log (s->avctx, AV_LOG_INFO, "Problem: stream_ptr out of bounds (%d >= %d)\n", \
}
#define CHECK_PIXEL_PTR(n) \
- if (pixel_ptr + n > pixel_limit) { \
- av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
+ if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
+ av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \
pixel_ptr + n, pixel_limit); \
return; \
} \
static void qtrle_decode_4bpp(QtrleContext *s)
{
+ int stream_ptr;
+ int header;
+ int start_line;
+ int lines_to_change;
+ int rle_code;
+ int row_ptr, pixel_ptr;
+ int row_inc = s->frame.linesize[0];
+ unsigned char pi1, pi2, pi3, pi4, pi5, pi6, pi7, pi8; /* 8 palette indices */
+ unsigned char *rgb = s->frame.data[0];
+ int pixel_limit = s->frame.linesize[0] * s->avctx->height;
+
+ /* check if this frame is even supposed to change */
+ if (s->size < 8)
+ return;
+
+ /* start after the chunk size */
+ stream_ptr = 4;
+
+ /* fetch the header */
+ CHECK_STREAM_PTR(2);
+ header = BE_16(&s->buf[stream_ptr]);
+ stream_ptr += 2;
+
+ /* if a header is present, fetch additional decoding parameters */
+ if (header & 0x0008) {
+ CHECK_STREAM_PTR(8);
+ start_line = BE_16(&s->buf[stream_ptr]);
+ stream_ptr += 4;
+ lines_to_change = BE_16(&s->buf[stream_ptr]);
+ stream_ptr += 4;
+ } else {
+ start_line = 0;
+ lines_to_change = s->avctx->height;
+ }
+
+ row_ptr = row_inc * start_line;
+ while (lines_to_change--) {
+ CHECK_STREAM_PTR(2);
+ pixel_ptr = row_ptr + (8 * (s->buf[stream_ptr++] - 1));
+
+ while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
+ if (rle_code == 0) {
+ /* there's another skip code in the stream */
+ CHECK_STREAM_PTR(1);
+ pixel_ptr += (8 * (s->buf[stream_ptr++] - 1));
+ CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
+ } else if (rle_code < 0) {
+ /* decode the run length code */
+ rle_code = -rle_code;
+ /* get the next 4 bytes from the stream, treat them as palette
+ * indices, and output them rle_code times */
+ CHECK_STREAM_PTR(4);
+ pi1 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
+ pi2 = (s->buf[stream_ptr++]) & 0x0f;
+ pi3 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
+ pi4 = (s->buf[stream_ptr++]) & 0x0f;
+ pi5 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
+ pi6 = (s->buf[stream_ptr++]) & 0x0f;
+ pi7 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
+ pi8 = (s->buf[stream_ptr++]) & 0x0f;
+
+ CHECK_PIXEL_PTR(rle_code * 8);
+
+ while (rle_code--) {
+ rgb[pixel_ptr++] = pi1;
+ rgb[pixel_ptr++] = pi2;
+ rgb[pixel_ptr++] = pi3;
+ rgb[pixel_ptr++] = pi4;
+ rgb[pixel_ptr++] = pi5;
+ rgb[pixel_ptr++] = pi6;
+ rgb[pixel_ptr++] = pi7;
+ rgb[pixel_ptr++] = pi8;
+ }
+ } else {
+ /* copy the same pixel directly to output 4 times */
+ rle_code *= 4;
+ CHECK_STREAM_PTR(rle_code);
+ CHECK_PIXEL_PTR(rle_code*2);
+
+ while (rle_code--) {
+ rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
+ rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
+ }
+ }
+ }
+ row_ptr += row_inc;
+ }
}
static void qtrle_decode_8bpp(QtrleContext *s)
int header;
int start_line;
int lines_to_change;
- signed char rle_code;
+ int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char pi1, pi2, pi3, pi4; /* 4 palette indices */
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (4 * (s->buf[stream_ptr++] - 1));
+ CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
int header;
int start_line;
int lines_to_change;
- signed char rle_code;
+ int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned short rgb16;
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 2;
+ CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
int header;
int start_line;
int lines_to_change;
- signed char rle_code;
+ int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char r, g, b;
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 3;
+ CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
int header;
int start_line;
int lines_to_change;
- signed char rle_code;
+ int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
- unsigned char r, g, b;
+ unsigned char a, r, g, b;
unsigned int argb;
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 4;
+ CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(4);
- stream_ptr++; /* skip the alpha (?) byte */
+ a = s->buf[stream_ptr++];
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++];
- argb = (r << 16) | (g << 8) | (b << 0);
+ argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
CHECK_PIXEL_PTR(rle_code * 4);
/* copy pixels directly to output */
while (rle_code--) {
- stream_ptr++; /* skip the alpha (?) byte */
+ a = s->buf[stream_ptr++];
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++];
- argb = (r << 16) | (g << 8) | (b << 0);
+ argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
*(unsigned int *)(&rgb[pixel_ptr]) = argb;
pixel_ptr += 4;
}
{
QtrleContext *s = (QtrleContext *)avctx->priv_data;
- /* no supplementary picture */
- if (buf_size == 0)
- return 0;
-
s->buf = buf;
s->size = buf_size;
case 4:
case 36:
qtrle_decode_4bpp(s);
+ /* make the palette available on the way out */
+ memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
+ if (s->avctx->palctrl->palette_changed) {
+ s->frame.palette_has_changed = 1;
+ s->avctx->palctrl->palette_changed = 0;
+ }
break;
case 8:
projects / ffmpeg / blobdiff