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* Quicktime Animation (RLE) Video Decoder
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* Copyright (C) 2004 the ffmpeg project
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the QT RLE format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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* The QT RLE decoder has seven modes of operation:
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* 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
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* the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
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* data. 24-bit data is RGB24 and 32-bit data is RGBA32.
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typedef struct QtrleContext {
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AVCodecContext *avctx;
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#define CHECK_STREAM_PTR(n) \
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if ((stream_ptr + n) > s->size) { \
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av_log (s->avctx, AV_LOG_INFO, "Problem: stream_ptr out of bounds (%d >= %d)\n", \
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stream_ptr + n, s->size); \
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#define CHECK_PIXEL_PTR(n) \
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if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
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av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \
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pixel_ptr + n, pixel_limit); \
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static void qtrle_decode_1bpp(QtrleContext *s)
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static void qtrle_decode_2bpp(QtrleContext *s)
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static void qtrle_decode_4bpp(QtrleContext *s)
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int row_ptr, pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned char pi1, pi2, pi3, pi4, pi5, pi6, pi7, pi8; /* 8 palette indices */
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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/* check if this frame is even supposed to change */
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/* start after the chunk size */
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/* fetch the header */
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header = BE_16(&s->buf[stream_ptr]);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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start_line = BE_16(&s->buf[stream_ptr]);
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lines_to_change = BE_16(&s->buf[stream_ptr]);
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lines_to_change = s->avctx->height;
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row_ptr = row_inc * start_line;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (8 * (s->buf[stream_ptr++] - 1));
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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/* there's another skip code in the stream */
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pixel_ptr += (8 * (s->buf[stream_ptr++] - 1));
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 4 bytes from the stream, treat them as palette
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* indices, and output them rle_code times */
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pi1 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi2 = (s->buf[stream_ptr++]) & 0x0f;
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pi3 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi4 = (s->buf[stream_ptr++]) & 0x0f;
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pi5 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi6 = (s->buf[stream_ptr++]) & 0x0f;
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pi7 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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pi8 = (s->buf[stream_ptr++]) & 0x0f;
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CHECK_PIXEL_PTR(rle_code * 8);
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rgb[pixel_ptr++] = pi1;
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rgb[pixel_ptr++] = pi2;
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rgb[pixel_ptr++] = pi3;
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rgb[pixel_ptr++] = pi4;
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rgb[pixel_ptr++] = pi5;
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rgb[pixel_ptr++] = pi6;
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rgb[pixel_ptr++] = pi7;
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rgb[pixel_ptr++] = pi8;
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/* copy the same pixel directly to output 4 times */
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CHECK_STREAM_PTR(rle_code);
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CHECK_PIXEL_PTR(rle_code*2);
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rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
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rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
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static void qtrle_decode_8bpp(QtrleContext *s)
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int row_ptr, pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned char pi1, pi2, pi3, pi4; /* 4 palette indices */
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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/* check if this frame is even supposed to change */
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/* start after the chunk size */
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/* fetch the header */
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header = BE_16(&s->buf[stream_ptr]);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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start_line = BE_16(&s->buf[stream_ptr]);
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lines_to_change = BE_16(&s->buf[stream_ptr]);
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lines_to_change = s->avctx->height;
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row_ptr = row_inc * start_line;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (4 * (s->buf[stream_ptr++] - 1));
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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/* there's another skip code in the stream */
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pixel_ptr += (4 * (s->buf[stream_ptr++] - 1));
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 4 bytes from the stream, treat them as palette
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* indices, and output them rle_code times */
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pi1 = s->buf[stream_ptr++];
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pi2 = s->buf[stream_ptr++];
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pi3 = s->buf[stream_ptr++];
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pi4 = s->buf[stream_ptr++];
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CHECK_PIXEL_PTR(rle_code * 4);
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rgb[pixel_ptr++] = pi1;
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rgb[pixel_ptr++] = pi2;
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rgb[pixel_ptr++] = pi3;
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rgb[pixel_ptr++] = pi4;
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/* copy the same pixel directly to output 4 times */
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CHECK_STREAM_PTR(rle_code);
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CHECK_PIXEL_PTR(rle_code);
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rgb[pixel_ptr++] = s->buf[stream_ptr++];
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static void qtrle_decode_16bpp(QtrleContext *s)
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int row_ptr, pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned short rgb16;
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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/* check if this frame is even supposed to change */
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/* start after the chunk size */
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/* fetch the header */
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header = BE_16(&s->buf[stream_ptr]);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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start_line = BE_16(&s->buf[stream_ptr]);
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lines_to_change = BE_16(&s->buf[stream_ptr]);
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lines_to_change = s->avctx->height;
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row_ptr = row_inc * start_line;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 2;
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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/* there's another skip code in the stream */
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pixel_ptr += (s->buf[stream_ptr++] - 1) * 2;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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rgb16 = BE_16(&s->buf[stream_ptr]);
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CHECK_PIXEL_PTR(rle_code * 2);
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*(unsigned short *)(&rgb[pixel_ptr]) = rgb16;
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CHECK_STREAM_PTR(rle_code * 2);
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CHECK_PIXEL_PTR(rle_code * 2);
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/* copy pixels directly to output */
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rgb16 = BE_16(&s->buf[stream_ptr]);
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*(unsigned short *)(&rgb[pixel_ptr]) = rgb16;
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static void qtrle_decode_24bpp(QtrleContext *s)
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int row_ptr, pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned char r, g, b;
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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/* check if this frame is even supposed to change */
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/* start after the chunk size */
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/* fetch the header */
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header = BE_16(&s->buf[stream_ptr]);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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start_line = BE_16(&s->buf[stream_ptr]);
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lines_to_change = BE_16(&s->buf[stream_ptr]);
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lines_to_change = s->avctx->height;
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row_ptr = row_inc * start_line;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 3;
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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/* there's another skip code in the stream */
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pixel_ptr += (s->buf[stream_ptr++] - 1) * 3;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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r = s->buf[stream_ptr++];
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g = s->buf[stream_ptr++];
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b = s->buf[stream_ptr++];
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CHECK_PIXEL_PTR(rle_code * 3);
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rgb[pixel_ptr++] = r;
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rgb[pixel_ptr++] = g;
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rgb[pixel_ptr++] = b;
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CHECK_STREAM_PTR(rle_code * 3);
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CHECK_PIXEL_PTR(rle_code * 3);
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/* copy pixels directly to output */
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rgb[pixel_ptr++] = s->buf[stream_ptr++];
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rgb[pixel_ptr++] = s->buf[stream_ptr++];
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rgb[pixel_ptr++] = s->buf[stream_ptr++];
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static void qtrle_decode_32bpp(QtrleContext *s)
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int row_ptr, pixel_ptr;
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int row_inc = s->frame.linesize[0];
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unsigned char a, r, g, b;
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unsigned char *rgb = s->frame.data[0];
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int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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/* check if this frame is even supposed to change */
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/* start after the chunk size */
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/* fetch the header */
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header = BE_16(&s->buf[stream_ptr]);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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start_line = BE_16(&s->buf[stream_ptr]);
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lines_to_change = BE_16(&s->buf[stream_ptr]);
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lines_to_change = s->avctx->height;
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row_ptr = row_inc * start_line;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 4;
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
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/* there's another skip code in the stream */
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pixel_ptr += (s->buf[stream_ptr++] - 1) * 4;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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a = s->buf[stream_ptr++];
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r = s->buf[stream_ptr++];
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g = s->buf[stream_ptr++];
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b = s->buf[stream_ptr++];
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argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
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CHECK_PIXEL_PTR(rle_code * 4);
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*(unsigned int *)(&rgb[pixel_ptr]) = argb;
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CHECK_STREAM_PTR(rle_code * 4);
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CHECK_PIXEL_PTR(rle_code * 4);
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/* copy pixels directly to output */
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a = s->buf[stream_ptr++];
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r = s->buf[stream_ptr++];
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g = s->buf[stream_ptr++];
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b = s->buf[stream_ptr++];
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argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
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*(unsigned int *)(&rgb[pixel_ptr]) = argb;
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static int qtrle_decode_init(AVCodecContext *avctx)
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QtrleContext *s = (QtrleContext *)avctx->priv_data;
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switch (avctx->bits_per_sample) {
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avctx->pix_fmt = PIX_FMT_PAL8;
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avctx->pix_fmt = PIX_FMT_RGB555;
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avctx->pix_fmt = PIX_FMT_RGB24;
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avctx->pix_fmt = PIX_FMT_RGBA32;
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av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
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avctx->bits_per_sample);
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avctx->has_b_frames = 0;
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dsputil_init(&s->dsp, avctx);
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s->frame.data[0] = NULL;
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static int qtrle_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf, int buf_size)
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QtrleContext *s = (QtrleContext *)avctx->priv_data;
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s->frame.reference = 1;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
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FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
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if (avctx->reget_buffer(avctx, &s->frame)) {
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av_log (s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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switch (avctx->bits_per_sample) {
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qtrle_decode_1bpp(s);
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qtrle_decode_2bpp(s);
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qtrle_decode_4bpp(s);
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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qtrle_decode_8bpp(s);
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/* make the palette available on the way out */
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memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
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if (s->avctx->palctrl->palette_changed) {
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s->frame.palette_has_changed = 1;
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s->avctx->palctrl->palette_changed = 0;
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qtrle_decode_16bpp(s);
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qtrle_decode_24bpp(s);
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qtrle_decode_32bpp(s);
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av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
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avctx->bits_per_sample);
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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/* always report that the buffer was completely consumed */
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static int qtrle_decode_end(AVCodecContext *avctx)
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QtrleContext *s = (QtrleContext *)avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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AVCodec qtrle_decoder = {
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sizeof(QtrleContext),
added
removed
adm_lavcodec/qtrle.c
