mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 11:49:48 +00:00
260 lines
9.0 KiB
C
260 lines
9.0 KiB
C
/*
|
|
* Microsoft RLE decoder
|
|
* Copyright (C) 2008 Konstantin Shishkov
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* MS RLE decoder based on decoder by Mike Melanson and my own for TSCC
|
|
* For more information about the MS RLE format, visit:
|
|
* http://www.multimedia.cx/msrle.txt
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avcodec.h"
|
|
#include "msrledec.h"
|
|
|
|
#define FETCH_NEXT_STREAM_BYTE() \
|
|
if (stream_ptr >= data_size) \
|
|
{ \
|
|
av_log(avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \
|
|
return -1; \
|
|
} \
|
|
stream_byte = data[stream_ptr++];
|
|
|
|
static int msrle_decode_pal4(AVCodecContext *avctx, AVPicture *pic,
|
|
const uint8_t *data, int data_size)
|
|
{
|
|
int stream_ptr = 0;
|
|
unsigned char rle_code;
|
|
unsigned char extra_byte, odd_pixel;
|
|
unsigned char stream_byte;
|
|
unsigned int pixel_ptr = 0;
|
|
int row_dec = pic->linesize[0];
|
|
int row_ptr = (avctx->height - 1) * row_dec;
|
|
int frame_size = row_dec * avctx->height;
|
|
int i;
|
|
|
|
while (row_ptr >= 0) {
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
rle_code = stream_byte;
|
|
if (rle_code == 0) {
|
|
/* fetch the next byte to see how to handle escape code */
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
if (stream_byte == 0) {
|
|
/* line is done, goto the next one */
|
|
row_ptr -= row_dec;
|
|
pixel_ptr = 0;
|
|
} else if (stream_byte == 1) {
|
|
/* decode is done */
|
|
return 0;
|
|
} else if (stream_byte == 2) {
|
|
/* reposition frame decode coordinates */
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
pixel_ptr += stream_byte;
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
row_ptr -= stream_byte * row_dec;
|
|
} else {
|
|
// copy pixels from encoded stream
|
|
odd_pixel = stream_byte & 1;
|
|
rle_code = (stream_byte + 1) / 2;
|
|
extra_byte = rle_code & 0x01;
|
|
if (row_ptr + pixel_ptr + stream_byte > frame_size) {
|
|
av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < rle_code; i++) {
|
|
if (pixel_ptr >= avctx->width)
|
|
break;
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
|
|
pixel_ptr++;
|
|
if (i + 1 == rle_code && odd_pixel)
|
|
break;
|
|
if (pixel_ptr >= avctx->width)
|
|
break;
|
|
pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
|
|
pixel_ptr++;
|
|
}
|
|
|
|
// if the RLE code is odd, skip a byte in the stream
|
|
if (extra_byte)
|
|
stream_ptr++;
|
|
}
|
|
} else {
|
|
// decode a run of data
|
|
if (row_ptr + pixel_ptr + stream_byte > frame_size) {
|
|
av_log(avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
|
|
return -1;
|
|
}
|
|
FETCH_NEXT_STREAM_BYTE();
|
|
for (i = 0; i < rle_code; i++) {
|
|
if (pixel_ptr >= avctx->width)
|
|
break;
|
|
if ((i & 1) == 0)
|
|
pic->data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
|
|
else
|
|
pic->data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
|
|
pixel_ptr++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* one last sanity check on the way out */
|
|
if (stream_ptr < data_size) {
|
|
av_log(avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n",
|
|
stream_ptr, data_size);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int msrle_decode_8_16_24_32(AVCodecContext *avctx, AVPicture *pic, int depth,
|
|
const uint8_t *data, int srcsize)
|
|
{
|
|
uint8_t *output, *output_end;
|
|
const uint8_t* src = data;
|
|
int p1, p2, line=avctx->height - 1, pos=0, i;
|
|
uint16_t av_uninit(pix16);
|
|
uint32_t av_uninit(pix32);
|
|
unsigned int width= FFABS(pic->linesize[0]) / (depth >> 3);
|
|
|
|
output = pic->data[0] + (avctx->height - 1) * pic->linesize[0];
|
|
output_end = pic->data[0] + (avctx->height) * pic->linesize[0];
|
|
while(src < data + srcsize) {
|
|
p1 = *src++;
|
|
if(p1 == 0) { //Escape code
|
|
p2 = *src++;
|
|
if(p2 == 0) { //End-of-line
|
|
output = pic->data[0] + (--line) * pic->linesize[0];
|
|
if (line < 0 && !(src+1 < data + srcsize && AV_RB16(src) == 1)) {
|
|
av_log(avctx, AV_LOG_ERROR, "Next line is beyond picture bounds\n");
|
|
return -1;
|
|
}
|
|
pos = 0;
|
|
continue;
|
|
} else if(p2 == 1) { //End-of-picture
|
|
return 0;
|
|
} else if(p2 == 2) { //Skip
|
|
p1 = *src++;
|
|
p2 = *src++;
|
|
line -= p2;
|
|
pos += p1;
|
|
if (line < 0 || pos >= width){
|
|
av_log(avctx, AV_LOG_ERROR, "Skip beyond picture bounds\n");
|
|
return -1;
|
|
}
|
|
output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3);
|
|
continue;
|
|
}
|
|
// Copy data
|
|
if ((pic->linesize[0] > 0 && output + p2 * (depth >> 3) > output_end)
|
|
||(pic->linesize[0] < 0 && output + p2 * (depth >> 3) < output_end)) {
|
|
src += p2 * (depth >> 3);
|
|
continue;
|
|
}
|
|
if ((depth == 8) || (depth == 24)) {
|
|
for(i = 0; i < p2 * (depth >> 3); i++) {
|
|
*output++ = *src++;
|
|
}
|
|
// RLE8 copy is actually padded - and runs are not!
|
|
if(depth == 8 && (p2 & 1)) {
|
|
src++;
|
|
}
|
|
} else if (depth == 16) {
|
|
for(i = 0; i < p2; i++) {
|
|
pix16 = AV_RL16(src);
|
|
src += 2;
|
|
*(uint16_t*)output = pix16;
|
|
output += 2;
|
|
}
|
|
} else if (depth == 32) {
|
|
for(i = 0; i < p2; i++) {
|
|
pix32 = AV_RL32(src);
|
|
src += 4;
|
|
*(uint32_t*)output = pix32;
|
|
output += 4;
|
|
}
|
|
}
|
|
pos += p2;
|
|
} else { //run of pixels
|
|
uint8_t pix[3]; //original pixel
|
|
switch(depth){
|
|
case 8: pix[0] = *src++;
|
|
break;
|
|
case 16: pix16 = AV_RL16(src);
|
|
src += 2;
|
|
break;
|
|
case 24: pix[0] = *src++;
|
|
pix[1] = *src++;
|
|
pix[2] = *src++;
|
|
break;
|
|
case 32: pix32 = AV_RL32(src);
|
|
src += 4;
|
|
break;
|
|
}
|
|
if ((pic->linesize[0] > 0 && output + p1 * (depth >> 3) > output_end)
|
|
||(pic->linesize[0] < 0 && output + p1 * (depth >> 3) < output_end))
|
|
continue;
|
|
for(i = 0; i < p1; i++) {
|
|
switch(depth){
|
|
case 8: *output++ = pix[0];
|
|
break;
|
|
case 16: *(uint16_t*)output = pix16;
|
|
output += 2;
|
|
break;
|
|
case 24: *output++ = pix[0];
|
|
*output++ = pix[1];
|
|
*output++ = pix[2];
|
|
break;
|
|
case 32: *(uint32_t*)output = pix32;
|
|
output += 4;
|
|
break;
|
|
}
|
|
}
|
|
pos += p1;
|
|
}
|
|
}
|
|
|
|
av_log(avctx, AV_LOG_WARNING, "MS RLE warning: no end-of-picture code\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth,
|
|
const uint8_t* data, int data_size)
|
|
{
|
|
switch(depth){
|
|
case 4:
|
|
return msrle_decode_pal4(avctx, pic, data, data_size);
|
|
case 8:
|
|
case 16:
|
|
case 24:
|
|
case 32:
|
|
return msrle_decode_8_16_24_32(avctx, pic, depth, data, data_size);
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown depth %d\n", depth);
|
|
return -1;
|
|
}
|
|
}
|
|
|