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624 lines
18 KiB
C
624 lines
18 KiB
C
/*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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) { \
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av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %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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} 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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} 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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signed char 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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} 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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signed char 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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}
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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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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;
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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(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++];
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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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/* copy pixels directly to output */
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while (rle_code--) {
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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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}
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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_32bpp(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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signed char 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 int argb;
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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) * 4;
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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) * 4;
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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(4);
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stream_ptr++; /* skip the alpha (?) byte */
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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 = (r << 16) | (g << 8) | (b << 0);
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CHECK_PIXEL_PTR(rle_code * 4);
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while (rle_code--) {
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*(unsigned int *)(&rgb[pixel_ptr]) = argb;
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pixel_ptr += 4;
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}
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} else {
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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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while (rle_code--) {
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stream_ptr++; /* skip the alpha (?) byte */
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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 = (r << 16) | (g << 8) | (b << 0);
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*(unsigned int *)(&rgb[pixel_ptr]) = argb;
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pixel_ptr += 4;
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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 int qtrle_decode_init(AVCodecContext *avctx)
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{
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QtrleContext *s = (QtrleContext *)avctx->priv_data;
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s->avctx = avctx;
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switch (avctx->bits_per_sample) {
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case 1:
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case 2:
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case 4:
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case 8:
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case 33:
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case 34:
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case 36:
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case 40:
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avctx->pix_fmt = PIX_FMT_PAL8;
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break;
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case 16:
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avctx->pix_fmt = PIX_FMT_RGB555;
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break;
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|
|
case 24:
|
|
avctx->pix_fmt = PIX_FMT_RGB24;
|
|
break;
|
|
|
|
case 32:
|
|
avctx->pix_fmt = PIX_FMT_RGBA32;
|
|
break;
|
|
|
|
default:
|
|
av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
|
|
avctx->bits_per_sample);
|
|
break;
|
|
}
|
|
avctx->has_b_frames = 0;
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
s->frame.data[0] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qtrle_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
QtrleContext *s = (QtrleContext *)avctx->priv_data;
|
|
|
|
s->buf = buf;
|
|
s->size = buf_size;
|
|
|
|
s->frame.reference = 1;
|
|
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
|
|
FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE;
|
|
if (avctx->reget_buffer(avctx, &s->frame)) {
|
|
av_log (s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
switch (avctx->bits_per_sample) {
|
|
case 1:
|
|
case 33:
|
|
qtrle_decode_1bpp(s);
|
|
break;
|
|
|
|
case 2:
|
|
case 34:
|
|
qtrle_decode_2bpp(s);
|
|
break;
|
|
|
|
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:
|
|
case 40:
|
|
qtrle_decode_8bpp(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 16:
|
|
qtrle_decode_16bpp(s);
|
|
break;
|
|
|
|
case 24:
|
|
qtrle_decode_24bpp(s);
|
|
break;
|
|
|
|
case 32:
|
|
qtrle_decode_32bpp(s);
|
|
break;
|
|
|
|
default:
|
|
av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
|
|
avctx->bits_per_sample);
|
|
break;
|
|
}
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int qtrle_decode_end(AVCodecContext *avctx)
|
|
{
|
|
QtrleContext *s = (QtrleContext *)avctx->priv_data;
|
|
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec qtrle_decoder = {
|
|
"qtrle",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_QTRLE,
|
|
sizeof(QtrleContext),
|
|
qtrle_decode_init,
|
|
NULL,
|
|
qtrle_decode_end,
|
|
qtrle_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|
|
|