ffmpeg / libavcodec / qtrle.c @ 5509bffa
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/*
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* Quicktime Animation (RLE) Video Decoder
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* Copyright (C) 2004 the ffmpeg project
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*
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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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*
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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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*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file qtrle.c
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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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*
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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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*/
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "common.h" |
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#include "avcodec.h" |
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#include "dsputil.h" |
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typedef struct QtrleContext { |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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AVFrame frame; |
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unsigned char *buf; |
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int size;
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} QtrleContext; |
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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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return; \
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} |
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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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return; \
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} \ |
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static void qtrle_decode_1bpp(QtrleContext *s) |
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{
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} |
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static void qtrle_decode_2bpp(QtrleContext *s) |
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{
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} |
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static void qtrle_decode_4bpp(QtrleContext *s) |
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{
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int stream_ptr;
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int header;
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int start_line;
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int lines_to_change;
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int rle_code;
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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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if (s->size < 8) |
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return;
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/* start after the chunk size */
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stream_ptr = 4;
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/* fetch the header */
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CHECK_STREAM_PTR(2);
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header = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) { |
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CHECK_STREAM_PTR(8);
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start_line = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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lines_to_change = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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} else {
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start_line = 0;
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lines_to_change = s->avctx->height; |
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} |
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row_ptr = row_inc * start_line; |
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while (lines_to_change--) {
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CHECK_STREAM_PTR(2);
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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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if (rle_code == 0) { |
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/* there's another skip code in the stream */
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CHECK_STREAM_PTR(1);
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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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CHECK_STREAM_PTR(4);
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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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while (rle_code--) {
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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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} |
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} else {
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/* copy the same pixel directly to output 4 times */
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rle_code *= 4;
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CHECK_STREAM_PTR(rle_code); |
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CHECK_PIXEL_PTR(rle_code*2);
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while (rle_code--) {
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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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} |
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} |
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} |
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row_ptr += row_inc; |
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} |
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} |
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static void qtrle_decode_8bpp(QtrleContext *s) |
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{
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int stream_ptr;
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int header;
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int start_line;
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int lines_to_change;
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int rle_code;
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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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if (s->size < 8) |
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return;
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/* start after the chunk size */
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stream_ptr = 4;
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/* fetch the header */
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CHECK_STREAM_PTR(2);
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header = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) { |
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CHECK_STREAM_PTR(8);
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start_line = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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lines_to_change = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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} else {
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start_line = 0;
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lines_to_change = s->avctx->height; |
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} |
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row_ptr = row_inc * start_line; |
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while (lines_to_change--) {
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CHECK_STREAM_PTR(2);
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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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if (rle_code == 0) { |
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/* there's another skip code in the stream */
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CHECK_STREAM_PTR(1);
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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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CHECK_STREAM_PTR(4);
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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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while (rle_code--) {
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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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} |
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} else {
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/* copy the same pixel directly to output 4 times */
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rle_code *= 4;
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CHECK_STREAM_PTR(rle_code); |
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CHECK_PIXEL_PTR(rle_code); |
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while (rle_code--) {
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rgb[pixel_ptr++] = s->buf[stream_ptr++]; |
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} |
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} |
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} |
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row_ptr += row_inc; |
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} |
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} |
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static void qtrle_decode_16bpp(QtrleContext *s) |
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{
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int stream_ptr;
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int header;
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int start_line;
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int lines_to_change;
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int rle_code;
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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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if (s->size < 8) |
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return;
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/* start after the chunk size */
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stream_ptr = 4;
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/* fetch the header */
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CHECK_STREAM_PTR(2);
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header = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) { |
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CHECK_STREAM_PTR(8);
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start_line = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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lines_to_change = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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} else {
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start_line = 0;
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lines_to_change = s->avctx->height; |
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} |
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row_ptr = row_inc * start_line; |
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while (lines_to_change--) {
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CHECK_STREAM_PTR(2);
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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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if (rle_code == 0) { |
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/* there's another skip code in the stream */
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CHECK_STREAM_PTR(1);
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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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CHECK_STREAM_PTR(2);
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rgb16 = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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CHECK_PIXEL_PTR(rle_code * 2);
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while (rle_code--) {
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*(unsigned short *)(&rgb[pixel_ptr]) = rgb16; |
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pixel_ptr += 2;
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} |
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} else {
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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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while (rle_code--) {
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rgb16 = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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*(unsigned short *)(&rgb[pixel_ptr]) = rgb16; |
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pixel_ptr += 2;
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} |
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} |
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} |
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row_ptr += row_inc; |
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} |
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} |
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static void qtrle_decode_24bpp(QtrleContext *s) |
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{
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int stream_ptr;
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int header;
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int start_line;
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int lines_to_change;
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int rle_code;
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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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if (s->size < 8) |
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return;
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/* start after the chunk size */
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stream_ptr = 4;
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/* fetch the header */
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CHECK_STREAM_PTR(2);
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header = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) { |
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CHECK_STREAM_PTR(8);
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start_line = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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lines_to_change = BE_16(&s->buf[stream_ptr]); |
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stream_ptr += 4;
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} else {
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start_line = 0;
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lines_to_change = s->avctx->height; |
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} |
| 362 |
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row_ptr = row_inc * start_line; |
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while (lines_to_change--) {
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CHECK_STREAM_PTR(2);
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pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 3; |
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|
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while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { |
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if (rle_code == 0) { |
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/* there's another skip code in the stream */
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CHECK_STREAM_PTR(1);
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pixel_ptr += (s->buf[stream_ptr++] - 1) * 3; |
| 373 |
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
| 374 |
} else if (rle_code < 0) { |
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/* decode the run length code */
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rle_code = -rle_code; |
| 377 |
CHECK_STREAM_PTR(3);
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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++]; |
| 381 |
|
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CHECK_PIXEL_PTR(rle_code * 3);
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while (rle_code--) {
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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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} |
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} else {
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CHECK_STREAM_PTR(rle_code * 3);
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CHECK_PIXEL_PTR(rle_code * 3);
|
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|
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/* copy pixels directly to output */
|
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while (rle_code--) {
|
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rgb[pixel_ptr++] = s->buf[stream_ptr++]; |
| 396 |
rgb[pixel_ptr++] = s->buf[stream_ptr++]; |
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rgb[pixel_ptr++] = s->buf[stream_ptr++]; |
| 398 |
} |
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} |
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} |
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row_ptr += row_inc; |
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} |
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} |
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|
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static void qtrle_decode_32bpp(QtrleContext *s) |
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{
|
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int stream_ptr;
|
| 408 |
int header;
|
| 409 |
int start_line;
|
| 410 |
int lines_to_change;
|
| 411 |
int rle_code;
|
| 412 |
int row_ptr, pixel_ptr;
|
| 413 |
int row_inc = s->frame.linesize[0]; |
| 414 |
unsigned char a, r, g, b; |
| 415 |
unsigned int argb; |
| 416 |
unsigned char *rgb = s->frame.data[0]; |
| 417 |
int pixel_limit = s->frame.linesize[0] * s->avctx->height; |
| 418 |
|
| 419 |
/* check if this frame is even supposed to change */
|
| 420 |
if (s->size < 8) |
| 421 |
return;
|
| 422 |
|
| 423 |
/* start after the chunk size */
|
| 424 |
stream_ptr = 4;
|
| 425 |
|
| 426 |
/* fetch the header */
|
| 427 |
CHECK_STREAM_PTR(2);
|
| 428 |
header = BE_16(&s->buf[stream_ptr]); |
| 429 |
stream_ptr += 2;
|
| 430 |
|
| 431 |
/* if a header is present, fetch additional decoding parameters */
|
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if (header & 0x0008) { |
| 433 |
CHECK_STREAM_PTR(8);
|
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start_line = BE_16(&s->buf[stream_ptr]); |
| 435 |
stream_ptr += 4;
|
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lines_to_change = BE_16(&s->buf[stream_ptr]); |
| 437 |
stream_ptr += 4;
|
| 438 |
} else {
|
| 439 |
start_line = 0;
|
| 440 |
lines_to_change = s->avctx->height; |
| 441 |
} |
| 442 |
|
| 443 |
row_ptr = row_inc * start_line; |
| 444 |
while (lines_to_change--) {
|
| 445 |
CHECK_STREAM_PTR(2);
|
| 446 |
pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 4; |
| 447 |
|
| 448 |
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { |
| 449 |
if (rle_code == 0) { |
| 450 |
/* there's another skip code in the stream */
|
| 451 |
CHECK_STREAM_PTR(1);
|
| 452 |
pixel_ptr += (s->buf[stream_ptr++] - 1) * 4; |
| 453 |
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
| 454 |
} else if (rle_code < 0) { |
| 455 |
/* decode the run length code */
|
| 456 |
rle_code = -rle_code; |
| 457 |
CHECK_STREAM_PTR(4);
|
| 458 |
a = s->buf[stream_ptr++]; |
| 459 |
r = s->buf[stream_ptr++]; |
| 460 |
g = s->buf[stream_ptr++]; |
| 461 |
b = s->buf[stream_ptr++]; |
| 462 |
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); |
| 463 |
|
| 464 |
CHECK_PIXEL_PTR(rle_code * 4);
|
| 465 |
|
| 466 |
while (rle_code--) {
|
| 467 |
*(unsigned int *)(&rgb[pixel_ptr]) = argb; |
| 468 |
pixel_ptr += 4;
|
| 469 |
} |
| 470 |
} else {
|
| 471 |
CHECK_STREAM_PTR(rle_code * 4);
|
| 472 |
CHECK_PIXEL_PTR(rle_code * 4);
|
| 473 |
|
| 474 |
/* copy pixels directly to output */
|
| 475 |
while (rle_code--) {
|
| 476 |
a = s->buf[stream_ptr++]; |
| 477 |
r = s->buf[stream_ptr++]; |
| 478 |
g = s->buf[stream_ptr++]; |
| 479 |
b = s->buf[stream_ptr++]; |
| 480 |
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); |
| 481 |
*(unsigned int *)(&rgb[pixel_ptr]) = argb; |
| 482 |
pixel_ptr += 4;
|
| 483 |
} |
| 484 |
} |
| 485 |
} |
| 486 |
row_ptr += row_inc; |
| 487 |
} |
| 488 |
} |
| 489 |
|
| 490 |
static int qtrle_decode_init(AVCodecContext *avctx) |
| 491 |
{
|
| 492 |
QtrleContext *s = (QtrleContext *)avctx->priv_data; |
| 493 |
|
| 494 |
s->avctx = avctx; |
| 495 |
switch (avctx->bits_per_sample) {
|
| 496 |
case 1: |
| 497 |
case 2: |
| 498 |
case 4: |
| 499 |
case 8: |
| 500 |
case 33: |
| 501 |
case 34: |
| 502 |
case 36: |
| 503 |
case 40: |
| 504 |
avctx->pix_fmt = PIX_FMT_PAL8; |
| 505 |
break;
|
| 506 |
|
| 507 |
case 16: |
| 508 |
avctx->pix_fmt = PIX_FMT_RGB555; |
| 509 |
break;
|
| 510 |
|
| 511 |
case 24: |
| 512 |
avctx->pix_fmt = PIX_FMT_RGB24; |
| 513 |
break;
|
| 514 |
|
| 515 |
case 32: |
| 516 |
avctx->pix_fmt = PIX_FMT_RGBA32; |
| 517 |
break;
|
| 518 |
|
| 519 |
default:
|
| 520 |
av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
|
| 521 |
avctx->bits_per_sample); |
| 522 |
break;
|
| 523 |
} |
| 524 |
avctx->has_b_frames = 0;
|
| 525 |
dsputil_init(&s->dsp, avctx); |
| 526 |
|
| 527 |
s->frame.data[0] = NULL; |
| 528 |
|
| 529 |
return 0; |
| 530 |
} |
| 531 |
|
| 532 |
static int qtrle_decode_frame(AVCodecContext *avctx, |
| 533 |
void *data, int *data_size, |
| 534 |
uint8_t *buf, int buf_size)
|
| 535 |
{
|
| 536 |
QtrleContext *s = (QtrleContext *)avctx->priv_data; |
| 537 |
|
| 538 |
s->buf = buf; |
| 539 |
s->size = buf_size; |
| 540 |
|
| 541 |
s->frame.reference = 1;
|
| 542 |
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | |
| 543 |
FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE; |
| 544 |
if (avctx->reget_buffer(avctx, &s->frame)) {
|
| 545 |
av_log (s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
| 546 |
return -1; |
| 547 |
} |
| 548 |
|
| 549 |
switch (avctx->bits_per_sample) {
|
| 550 |
case 1: |
| 551 |
case 33: |
| 552 |
qtrle_decode_1bpp(s); |
| 553 |
break;
|
| 554 |
|
| 555 |
case 2: |
| 556 |
case 34: |
| 557 |
qtrle_decode_2bpp(s); |
| 558 |
break;
|
| 559 |
|
| 560 |
case 4: |
| 561 |
case 36: |
| 562 |
qtrle_decode_4bpp(s); |
| 563 |
/* make the palette available on the way out */
|
| 564 |
memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
|
| 565 |
if (s->avctx->palctrl->palette_changed) {
|
| 566 |
s->frame.palette_has_changed = 1;
|
| 567 |
s->avctx->palctrl->palette_changed = 0;
|
| 568 |
} |
| 569 |
break;
|
| 570 |
|
| 571 |
case 8: |
| 572 |
case 40: |
| 573 |
qtrle_decode_8bpp(s); |
| 574 |
/* make the palette available on the way out */
|
| 575 |
memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE);
|
| 576 |
if (s->avctx->palctrl->palette_changed) {
|
| 577 |
s->frame.palette_has_changed = 1;
|
| 578 |
s->avctx->palctrl->palette_changed = 0;
|
| 579 |
} |
| 580 |
break;
|
| 581 |
|
| 582 |
case 16: |
| 583 |
qtrle_decode_16bpp(s); |
| 584 |
break;
|
| 585 |
|
| 586 |
case 24: |
| 587 |
qtrle_decode_24bpp(s); |
| 588 |
break;
|
| 589 |
|
| 590 |
case 32: |
| 591 |
qtrle_decode_32bpp(s); |
| 592 |
break;
|
| 593 |
|
| 594 |
default:
|
| 595 |
av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
|
| 596 |
avctx->bits_per_sample); |
| 597 |
break;
|
| 598 |
} |
| 599 |
|
| 600 |
*data_size = sizeof(AVFrame);
|
| 601 |
*(AVFrame*)data = s->frame; |
| 602 |
|
| 603 |
/* always report that the buffer was completely consumed */
|
| 604 |
return buf_size;
|
| 605 |
} |
| 606 |
|
| 607 |
static int qtrle_decode_end(AVCodecContext *avctx) |
| 608 |
{
|
| 609 |
QtrleContext *s = (QtrleContext *)avctx->priv_data; |
| 610 |
|
| 611 |
if (s->frame.data[0]) |
| 612 |
avctx->release_buffer(avctx, &s->frame); |
| 613 |
|
| 614 |
return 0; |
| 615 |
} |
| 616 |
|
| 617 |
AVCodec qtrle_decoder = {
|
| 618 |
"qtrle",
|
| 619 |
CODEC_TYPE_VIDEO, |
| 620 |
CODEC_ID_QTRLE, |
| 621 |
sizeof(QtrleContext),
|
| 622 |
qtrle_decode_init, |
| 623 |
NULL,
|
| 624 |
qtrle_decode_end, |
| 625 |
qtrle_decode_frame, |
| 626 |
CODEC_CAP_DR1, |
| 627 |
}; |
| 628 |
|