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/*
* Quicktime Animation (RLE) Video Decoder
* Copyright (C) 2004 the ffmpeg project
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; 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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* @file |
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* 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 |
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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 RGB32. |
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*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
|
6a5d31ac |
#include "libavutil/intreadwrite.h" |
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#include "avcodec.h"
typedef struct QtrleContext {
AVCodecContext *avctx;
AVFrame frame;
|
04deea9a |
const unsigned char *buf; |
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int size;
|
2d8591c2 |
uint32_t pal[256]; |
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} QtrleContext;
#define CHECK_STREAM_PTR(n) \
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); \
return; \
}
#define CHECK_PIXEL_PTR(n) \ |
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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", \ |
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pixel_ptr + n, pixel_limit); \
return; \
} \
|
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static void qtrle_decode_1bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) |
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{ |
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int rle_code;
int pixel_ptr = 0;
int row_inc = s->frame.linesize[0];
unsigned char pi0, pi1; /* 2 8-pixel values */
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
int skip; |
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|
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while (lines_to_change) {
CHECK_STREAM_PTR(2);
skip = s->buf[stream_ptr++];
rle_code = (signed char)s->buf[stream_ptr++];
if (rle_code == 0)
break;
if(skip & 0x80) {
lines_to_change--;
row_ptr += row_inc;
pixel_ptr = row_ptr + 2 * (skip & 0x7f);
} else
pixel_ptr += 2 * skip;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 2 bytes from the stream, treat them as groups
* of 8 pixels, and output them rle_code times */
CHECK_STREAM_PTR(2);
pi0 = s->buf[stream_ptr++];
pi1 = s->buf[stream_ptr++];
CHECK_PIXEL_PTR(rle_code * 2);
while (rle_code--) {
rgb[pixel_ptr++] = pi0;
rgb[pixel_ptr++] = pi1;
}
} else {
/* copy the same pixel directly to output 2 times */
rle_code *= 2;
CHECK_STREAM_PTR(rle_code);
CHECK_PIXEL_PTR(rle_code);
while (rle_code--)
rgb[pixel_ptr++] = s->buf[stream_ptr++];
}
} |
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}
|
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static inline void qtrle_decode_2n4bpp(QtrleContext *s, int stream_ptr,
int row_ptr, int lines_to_change, int bpp) |
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{ |
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int rle_code, i; |
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int pixel_ptr; |
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int row_inc = s->frame.linesize[0]; |
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unsigned char pi[16]; /* 16 palette indices */ |
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unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height; |
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int num_pixels = (bpp == 4) ? 8 : 16; |
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while (lines_to_change--) {
CHECK_STREAM_PTR(2); |
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pixel_ptr = row_ptr + (num_pixels * (s->buf[stream_ptr++] - 1)); |
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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); |
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pixel_ptr += (num_pixels * (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) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 4 bytes from the stream, treat them as palette |
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* indexes, and output them rle_code times */ |
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CHECK_STREAM_PTR(4); |
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for (i = num_pixels-1; i >= 0; i--) {
pi[num_pixels-1-i] = (s->buf[stream_ptr] >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);
stream_ptr+= ((i & ((num_pixels>>2)-1)) == 0);
}
CHECK_PIXEL_PTR(rle_code * num_pixels); |
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while (rle_code--) { |
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for (i = 0; i < num_pixels; i++)
rgb[pixel_ptr++] = pi[i]; |
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}
} else {
/* copy the same pixel directly to output 4 times */
rle_code *= 4;
CHECK_STREAM_PTR(rle_code); |
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CHECK_PIXEL_PTR(rle_code*(num_pixels>>2)); |
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while (rle_code--) { |
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if(bpp == 4) {
rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f;
rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f;
} else {
rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 6) & 0x03;
rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x03;
rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 2) & 0x03;
rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x03;
} |
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}
}
}
row_ptr += row_inc;
} |
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}
|
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static void qtrle_decode_8bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) |
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{ |
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int rle_code; |
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int 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 indexes */ |
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unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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)); |
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
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} 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 |
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* indexes, and output them rle_code times */ |
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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;
}
}
|
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static void qtrle_decode_16bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) |
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{ |
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int rle_code; |
03f7e568 |
int pixel_ptr; |
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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;
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; |
a06c7e07 |
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
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} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(2); |
fead30d4 |
rgb16 = AV_RB16(&s->buf[stream_ptr]); |
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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--) { |
fead30d4 |
rgb16 = AV_RB16(&s->buf[stream_ptr]); |
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stream_ptr += 2;
*(unsigned short *)(&rgb[pixel_ptr]) = rgb16;
pixel_ptr += 2;
}
}
}
row_ptr += row_inc;
}
}
|
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static void qtrle_decode_24bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) |
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{ |
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int rle_code; |
03f7e568 |
int pixel_ptr; |
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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;
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; |
a06c7e07 |
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
070ed1bc |
} 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;
}
}
|
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static void qtrle_decode_32bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) |
070ed1bc |
{ |
5b0e811a |
int rle_code; |
03f7e568 |
int pixel_ptr; |
070ed1bc |
int row_inc = s->frame.linesize[0]; |
e84a0475 |
unsigned char a, r, g, b; |
070ed1bc |
unsigned int argb;
unsigned char *rgb = s->frame.data[0];
int pixel_limit = s->frame.linesize[0] * s->avctx->height;
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; |
a06c7e07 |
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ |
070ed1bc |
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
CHECK_STREAM_PTR(4); |
e84a0475 |
a = s->buf[stream_ptr++]; |
070ed1bc |
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++]; |
e84a0475 |
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); |
070ed1bc |
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--) { |
e84a0475 |
a = s->buf[stream_ptr++]; |
070ed1bc |
r = s->buf[stream_ptr++];
g = s->buf[stream_ptr++];
b = s->buf[stream_ptr++]; |
e84a0475 |
argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); |
070ed1bc |
*(unsigned int *)(&rgb[pixel_ptr]) = argb;
pixel_ptr += 4;
}
}
}
row_ptr += row_inc;
}
}
|
98a6fff9 |
static av_cold int qtrle_decode_init(AVCodecContext *avctx) |
070ed1bc |
{ |
e4141433 |
QtrleContext *s = avctx->priv_data; |
070ed1bc |
s->avctx = avctx; |
dd1c8f3e |
switch (avctx->bits_per_coded_sample) { |
070ed1bc |
case 1: |
bd547403 |
case 33:
avctx->pix_fmt = PIX_FMT_MONOWHITE;
break;
|
070ed1bc |
case 2:
case 4:
case 8:
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: |
71e445fc |
avctx->pix_fmt = PIX_FMT_RGB32; |
070ed1bc |
break;
default: |
42608d65 |
av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n", |
dd1c8f3e |
avctx->bits_per_coded_sample); |
070ed1bc |
break;
}
|
01042d41 |
avcodec_get_frame_defaults(&s->frame); |
070ed1bc |
s->frame.data[0] = NULL;
return 0;
}
static int qtrle_decode_frame(AVCodecContext *avctx,
void *data, int *data_size, |
7a00bbad |
AVPacket *avpkt) |
070ed1bc |
{ |
7a00bbad |
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size; |
e4141433 |
QtrleContext *s = avctx->priv_data; |
03f7e568 |
int header, start_line;
int stream_ptr, height, row_ptr; |
bd547403 |
int has_palette = 0; |
070ed1bc |
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)) { |
42608d65 |
av_log (s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
070ed1bc |
return -1;
}
|
03f7e568 |
/* check if this frame is even supposed to change */
if (s->size < 8)
goto done;
/* start after the chunk size */
stream_ptr = 4;
/* fetch the header */
header = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 2;
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
if(s->size < 14)
goto done;
start_line = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
height = AV_RB16(&s->buf[stream_ptr]);
stream_ptr += 4;
} else {
start_line = 0;
height = s->avctx->height;
}
row_ptr = s->frame.linesize[0] * start_line;
|
dd1c8f3e |
switch (avctx->bits_per_coded_sample) { |
070ed1bc |
case 1:
case 33: |
03f7e568 |
qtrle_decode_1bpp(s, stream_ptr, row_ptr, height); |
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break;
case 2:
case 34: |
bd547403 |
qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 2);
has_palette = 1; |
070ed1bc |
break;
case 4:
case 36: |
bd547403 |
qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 4);
has_palette = 1; |
070ed1bc |
break;
case 8:
case 40: |
03f7e568 |
qtrle_decode_8bpp(s, stream_ptr, row_ptr, height); |
bd547403 |
has_palette = 1; |
070ed1bc |
break;
case 16: |
03f7e568 |
qtrle_decode_16bpp(s, stream_ptr, row_ptr, height); |
070ed1bc |
break;
case 24: |
03f7e568 |
qtrle_decode_24bpp(s, stream_ptr, row_ptr, height); |
070ed1bc |
break;
case 32: |
03f7e568 |
qtrle_decode_32bpp(s, stream_ptr, row_ptr, height); |
070ed1bc |
break;
default: |
42608d65 |
av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n", |
dd1c8f3e |
avctx->bits_per_coded_sample); |
070ed1bc |
break;
} |
bd547403 |
if(has_palette) { |
2d8591c2 |
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
if (pal) { |
bd547403 |
s->frame.palette_has_changed = 1; |
2d8591c2 |
memcpy(s->pal, pal, AVPALETTE_SIZE); |
bd547403 |
} |
2d8591c2 |
/* make the palette available on the way out */
memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE); |
bd547403 |
}
|
03f7e568 |
done: |
070ed1bc |
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
/* always report that the buffer was completely consumed */
return buf_size;
}
|
98a6fff9 |
static av_cold int qtrle_decode_end(AVCodecContext *avctx) |
070ed1bc |
{ |
e4141433 |
QtrleContext *s = avctx->priv_data; |
070ed1bc |
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
return 0;
}
|
e7e2df27 |
AVCodec ff_qtrle_decoder = { |
070ed1bc |
"qtrle", |
72415b2a |
AVMEDIA_TYPE_VIDEO, |
070ed1bc |
CODEC_ID_QTRLE,
sizeof(QtrleContext),
qtrle_decode_init,
NULL,
qtrle_decode_end,
qtrle_decode_frame,
CODEC_CAP_DR1, |
fe4bf374 |
.long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"), |
070ed1bc |
};
|