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FFmpeg/libavcodec/qtrle.c
Nicholas Tung e4141433ea Get rid of unnecessary pointer casts. 
patch by Nicholas Tung, ntung ntung com

Originally committed as revision 8687 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007-04-08 20:24:16 +00:00

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/*
* Quicktime Animation (RLE) Video Decoder
* Copyright (C) 2004 the ffmpeg project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* @file qtrle.c
* QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the QT RLE format, visit:
* http://www.pcisys.net/~melanson/codecs/
*
* The QT RLE decoder has seven modes of operation:
* 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
* the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
* data. 24-bit data is RGB24 and 32-bit data is RGB32.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
typedef struct QtrleContext {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame frame;
unsigned char *buf;
int size;
} QtrleContext;
#define CHECK_STREAM_PTR(n) \
if ((stream_ptr + n) > s->size) { \
av_log (s->avctx, AV_LOG_INFO, "Problem: stream_ptr out of bounds (%d >= %d)\n", \
stream_ptr + n, s->size); \
return; \
}
#define CHECK_PIXEL_PTR(n) \
if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \
pixel_ptr + n, pixel_limit); \
return; \
} \
static void qtrle_decode_1bpp(QtrleContext *s)
{
}
static void qtrle_decode_2bpp(QtrleContext *s)
{
}
static void qtrle_decode_4bpp(QtrleContext *s)
{
int stream_ptr;
int header;
int start_line;
int lines_to_change;
int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char pi1, pi2, pi3, pi4, pi5, pi6, pi7, pi8; /* 8 palette indices */
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* check if this frame is even supposed to change */
if (s->size < 8)
return;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
CHECK_STREAM_PTR(2);
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
CHECK_STREAM_PTR(8);
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
lines_to_change = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
lines_to_change = s->avctx->height;
}
row_ptr = row_inc * start_line;
while (lines_to_change--) {
CHECK_STREAM_PTR(2);
pixel_ptr = row_ptr + (8 * (s->buf[stream_ptr++] - 1));
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
if (rle_code == 0) {
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (8 * (s->buf[stream_ptr++] - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 4 bytes from the stream, treat them as palette
* indices, and output them rle_code times */
CHECK_STREAM_PTR(4);
pi1 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
pi2 = (s->buf[stream_ptr++]) & 0x0f;
pi3 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
pi4 = (s->buf[stream_ptr++]) & 0x0f;
pi5 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
pi6 = (s->buf[stream_ptr++]) & 0x0f;
pi7 = ((s->buf[stream_ptr]) >> 4) & 0x0f;
pi8 = (s->buf[stream_ptr++]) & 0x0f;
CHECK_PIXEL_PTR(rle_code * 8);
while (rle_code--) {
rgb[pixel_ptr++] = pi1;
rgb[pixel_ptr++] = pi2;
rgb[pixel_ptr++] = pi3;
rgb[pixel_ptr++] = pi4;
rgb[pixel_ptr++] = pi5;
rgb[pixel_ptr++] = pi6;
rgb[pixel_ptr++] = pi7;
rgb[pixel_ptr++] = pi8;
}
} else {
/* copy the same pixel directly to output 4 times */
rle_code *= 4;
CHECK_STREAM_PTR(rle_code);
CHECK_PIXEL_PTR(rle_code*2);
while (rle_code--) {
rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_8bpp(QtrleContext *s)
{
int stream_ptr;
int header;
int start_line;
int lines_to_change;
int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char pi1, pi2, pi3, pi4; /* 4 palette indices */
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* check if this frame is even supposed to change */
if (s->size < 8)
return;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
CHECK_STREAM_PTR(2);
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
CHECK_STREAM_PTR(8);
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
lines_to_change = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
lines_to_change = s->avctx->height;
}
row_ptr = row_inc * start_line;
while (lines_to_change--) {
CHECK_STREAM_PTR(2);
pixel_ptr = row_ptr + (4 * (s->buf[stream_ptr++] - 1));
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
if (rle_code == 0) {
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (4 * (s->buf[stream_ptr++] - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 4 bytes from the stream, treat them as palette
* indices, and output them rle_code times */
CHECK_STREAM_PTR(4);
pi1 = s->buf[stream_ptr++];
pi2 = s->buf[stream_ptr++];
pi3 = s->buf[stream_ptr++];
pi4 = s->buf[stream_ptr++];
CHECK_PIXEL_PTR(rle_code * 4);
while (rle_code--) {
rgb[pixel_ptr++] = pi1;
rgb[pixel_ptr++] = pi2;
rgb[pixel_ptr++] = pi3;
rgb[pixel_ptr++] = pi4;
}
} else {
/* copy the same pixel directly to output 4 times */
rle_code *= 4;
CHECK_STREAM_PTR(rle_code);
CHECK_PIXEL_PTR(rle_code);
while (rle_code--) {
rgb[pixel_ptr++] = s->buf[stream_ptr++];
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_16bpp(QtrleContext *s)
{
int stream_ptr;
int header;
int start_line;
int lines_to_change;
int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned short rgb16;
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* check if this frame is even supposed to change */
if (s->size < 8)
return;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
CHECK_STREAM_PTR(2);
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
CHECK_STREAM_PTR(8);
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
lines_to_change = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
lines_to_change = s->avctx->height;
}
row_ptr = row_inc * start_line;
while (lines_to_change--) {
CHECK_STREAM_PTR(2);
pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 2;
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
if (rle_code == 0) {
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 2;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(2);
rgb16 = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
CHECK_PIXEL_PTR(rle_code * 2);
while (rle_code--) {
*(unsigned short *)(&rgb[pixel_ptr]) = rgb16;
pixel_ptr += 2;
}
} else {
CHECK_STREAM_PTR(rle_code * 2);
CHECK_PIXEL_PTR(rle_code * 2);
/* copy pixels directly to output */
while (rle_code--) {
rgb16 = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
*(unsigned short *)(&rgb[pixel_ptr]) = rgb16;
pixel_ptr += 2;
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_24bpp(QtrleContext *s)
{
int stream_ptr;
int header;
int start_line;
int lines_to_change;
int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char r, g, b;
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* check if this frame is even supposed to change */
if (s->size < 8)
return;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
CHECK_STREAM_PTR(2);
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
CHECK_STREAM_PTR(8);
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
lines_to_change = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
lines_to_change = s->avctx->height;
}
row_ptr = row_inc * start_line;
while (lines_to_change--) {
CHECK_STREAM_PTR(2);
pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 3;
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
if (rle_code == 0) {
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 3;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(3);
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++];
CHECK_PIXEL_PTR(rle_code * 3);
while (rle_code--) {
rgb[pixel_ptr++] = r;
rgb[pixel_ptr++] = g;
rgb[pixel_ptr++] = b;
}
} else {
CHECK_STREAM_PTR(rle_code * 3);
CHECK_PIXEL_PTR(rle_code * 3);
/* copy pixels directly to output */
while (rle_code--) {
rgb[pixel_ptr++] = s->buf[stream_ptr++];
rgb[pixel_ptr++] = s->buf[stream_ptr++];
rgb[pixel_ptr++] = s->buf[stream_ptr++];
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_32bpp(QtrleContext *s)
{
int stream_ptr;
int header;
int start_line;
int lines_to_change;
int rle_code;
int row_ptr, pixel_ptr;
int row_inc = s->frame.linesize[0];
unsigned char a, r, g, b;
unsigned int argb;
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
/* check if this frame is even supposed to change */
if (s->size < 8)
return;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
CHECK_STREAM_PTR(2);
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
CHECK_STREAM_PTR(8);
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
lines_to_change = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
lines_to_change = s->avctx->height;
}
row_ptr = row_inc * start_line;
while (lines_to_change--) {
CHECK_STREAM_PTR(2);
pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 4;
while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) {
if (rle_code == 0) {
/* there's another skip code in the stream */
CHECK_STREAM_PTR(1);
pixel_ptr += (s->buf[stream_ptr++] - 1) * 4;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(4);
a = s->buf[stream_ptr++];
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++];
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
CHECK_PIXEL_PTR(rle_code * 4);
while (rle_code--) {
*(unsigned int *)(&rgb[pixel_ptr]) = argb;
pixel_ptr += 4;
}
} else {
CHECK_STREAM_PTR(rle_code * 4);
CHECK_PIXEL_PTR(rle_code * 4);
/* copy pixels directly to output */
while (rle_code--) {
a = s->buf[stream_ptr++];
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++];
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0);
*(unsigned int *)(&rgb[pixel_ptr]) = argb;
pixel_ptr += 4;
}
}
}
row_ptr += row_inc;
}
}
static int qtrle_decode_init(AVCodecContext *avctx)
{
QtrleContext *s = avctx->priv_data;
s->avctx = avctx;
switch (avctx->bits_per_sample) {
case 1:
case 2:
case 4:
case 8:
case 33:
case 34:
case 36:
case 40:
avctx->pix_fmt = PIX_FMT_PAL8;
break;
case 16:
avctx->pix_fmt = PIX_FMT_RGB555;
break;
case 24:
avctx->pix_fmt = PIX_FMT_RGB24;
break;
case 32:
avctx->pix_fmt = PIX_FMT_RGB32;
break;
default:
av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
avctx->bits_per_sample);
break;
}
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 = 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 = 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,
};
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