Skip to content

F
ffmpeg.wasm-core
Commit 44aa9771 authored by Kostya Shishkov's avatar Kostya Shishkov
Browse files
Options

Factorize out code used for MS RLE format decoding in different decoders. 

Originally committed as revision 15356 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent f7e5b0cc
Hide whitespace changes
Inline Side-by-side
Showing with 309 additions and 387 deletions
libavcodec/Makefile
View file @ 44aa9771
......@@ -26,7 +26,7 @@ HEADERS = avcodec.h opt.h
OBJS-$(CONFIG_ENCODERS) += faandct.o jfdctfst.o jfdctint.o
OBJS-$(CONFIG_AAC_DECODER) += aac.o aactab.o mdct.o fft.o
OBJS-$(CONFIG_AASC_DECODER) += aasc.o
OBJS-$(CONFIG_AASC_DECODER) += aasc.o msrledec.o
OBJS-$(CONFIG_AC3_DECODER) += eac3dec.o ac3dec.o ac3tab.o ac3dec_data.o ac3.o mdct.o fft.o
OBJS-$(CONFIG_AC3_ENCODER) += ac3enc.o ac3tab.o ac3.o
OBJS-$(CONFIG_ALAC_DECODER) += alac.o
......@@ -136,7 +136,7 @@ OBJS-$(CONFIG_MSMPEG4V2_DECODER) += msmpeg4.o msmpeg4data.o h263dec.o h263
OBJS-$(CONFIG_MSMPEG4V2_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o mpeg12data.o mpegvideo.o error_resilience.o
OBJS-$(CONFIG_MSMPEG4V3_DECODER) += msmpeg4.o msmpeg4data.o h263dec.o h263.o mpeg12data.o mpegvideo.o error_resilience.o
OBJS-$(CONFIG_MSMPEG4V3_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.o motion_est.o ratecontrol.o h263.o mpeg12data.o mpegvideo.o error_resilience.o
OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o
OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o msrledec.o
OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o nellymoser.o mdct.o fft.o
......@@ -197,7 +197,7 @@ OBJS-$(CONFIG_TIFF_ENCODER) += tiffenc.o rle.o lzwenc.o
OBJS-$(CONFIG_TRUEMOTION1_DECODER) += truemotion1.o
OBJS-$(CONFIG_TRUEMOTION2_DECODER) += truemotion2.o
OBJS-$(CONFIG_TRUESPEECH_DECODER) += truespeech.o
OBJS-$(CONFIG_TSCC_DECODER) += tscc.o
OBJS-$(CONFIG_TSCC_DECODER) += tscc.o msrledec.o
OBJS-$(CONFIG_TTA_DECODER) += tta.o
OBJS-$(CONFIG_TXD_DECODER) += txd.o s3tc.o
OBJS-$(CONFIG_ULTI_DECODER) += ulti.o
......
libavcodec/aasc.c
View file @ 44aa9771
......@@ -30,6 +30,7 @@
#include "avcodec.h"
#include "dsputil.h"
#include "msrledec.h"
typedef struct AascContext {
AVCodecContext *avctx;
......@@ -61,13 +62,6 @@ static int aasc_decode_frame(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
AascContext *s = avctx->priv_data;
int stream_ptr = 4;
unsigned char rle_code;
unsigned char stream_byte;
int pixel_ptr = 0;
int row_dec, row_ptr;
int frame_size;
int i;
s->frame.reference = 1;
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
......@@ -76,72 +70,7 @@ static int aasc_decode_frame(AVCodecContext *avctx,
return -1;
}
row_dec = s->frame.linesize[0];
row_ptr = (s->avctx->height - 1) * row_dec;
frame_size = row_dec * s->avctx->height;
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 */
break;
} 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 */
if ((pixel_ptr + stream_byte > avctx->width * 3) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (copy1)\n");
break;
}
rle_code = stream_byte;
if (stream_ptr + rle_code > buf_size) {
av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (copy2)\n");
break;
}
for (i = 0; i < rle_code; i++) {
FETCH_NEXT_STREAM_BYTE();
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
pixel_ptr++;
}
if (rle_code & 1)
stream_ptr++;
}
} else {
/* decode a run of data */
if ((pixel_ptr + rle_code > avctx->width * 3) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (run1)\n");
break;
}
FETCH_NEXT_STREAM_BYTE();
while(rle_code--) {
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
pixel_ptr++;
}
}
}
/* one last sanity check on the way out */
if (stream_ptr < buf_size)
av_log(s->avctx, AV_LOG_ERROR, " AASC: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, buf_size);
ff_msrle_decode(avctx, &s->frame, 8, buf, buf_size);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
......
libavcodec/msrle.c
View file @ 44aa9771
......@@ -38,6 +38,7 @@
#include "avcodec.h"
#include "dsputil.h"
#include "msrledec.h"
typedef struct MsrleContext {
AVCodecContext *avctx;
......@@ -48,194 +49,6 @@ typedef struct MsrleContext {
} MsrleContext;
#define FETCH_NEXT_STREAM_BYTE() \
if (stream_ptr >= s->size) \
{ \
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (1)\n"); \
return; \
} \
stream_byte = s->buf[stream_ptr++];
static void msrle_decode_pal4(MsrleContext *s)
{
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte, odd_pixel;
unsigned char stream_byte;
int pixel_ptr = 0;
int row_dec = s->frame.linesize[0];
int row_ptr = (s->avctx->height - 1) * row_dec;
int frame_size = row_dec * s->avctx->height;
int i;
/* make the palette available */
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;
}
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;
} 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) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
for (i = 0; i < rle_code; i++) {
if (pixel_ptr >= s->avctx->width)
break;
FETCH_NEXT_STREAM_BYTE();
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
pixel_ptr++;
if (i + 1 == rle_code && odd_pixel)
break;
if (pixel_ptr >= s->avctx->width)
break;
s->frame.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) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
FETCH_NEXT_STREAM_BYTE();
for (i = 0; i < rle_code; i++) {
if (pixel_ptr >= s->avctx->width)
break;
if ((i & 1) == 0)
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
else
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
pixel_ptr++;
}
}
}
/* one last sanity check on the way out */
if (stream_ptr < s->size)
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, s->size);
}
static void msrle_decode_pal8(MsrleContext *s)
{
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte;
unsigned char stream_byte;
int pixel_ptr = 0;
int row_dec = s->frame.linesize[0];
int row_ptr = (s->avctx->height - 1) * row_dec;
int frame_size = row_dec * s->avctx->height;
/* make the palette available */
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;
}
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;
} 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 */
if ((row_ptr + pixel_ptr + stream_byte > frame_size) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
rle_code = stream_byte;
extra_byte = stream_byte & 0x01;
if (stream_ptr + rle_code + extra_byte > s->size) {
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: stream ptr just went out of bounds (2)\n");
return;
}
while (rle_code--) {
FETCH_NEXT_STREAM_BYTE();
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
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) ||
(row_ptr < 0)) {
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: frame ptr just went out of bounds (2)\n");
return;
}
FETCH_NEXT_STREAM_BYTE();
while(rle_code--) {
s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
pixel_ptr++;
}
}
}
/* one last sanity check on the way out */
if (stream_ptr < s->size)
av_log(s->avctx, AV_LOG_ERROR, " MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, s->size);
}
static av_cold int msrle_decode_init(AVCodecContext *avctx)
{
MsrleContext *s = avctx->priv_data;
......@@ -264,18 +77,15 @@ static int msrle_decode_frame(AVCodecContext *avctx,
return -1;
}
switch (avctx->bits_per_coded_sample) {
case 8:
msrle_decode_pal8(s);
break;
case 4:
msrle_decode_pal4(s);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Don't know how to decode depth %u.\n",
avctx->bits_per_coded_sample);
/* make the palette available */
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;
}
ff_msrle_decode(avctx, &s->frame, avctx->bits_per_coded_sample, buf, buf_size);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
......
libavcodec/msrledec.c 0 → 100644
View file @ 44aa9771
/*
* Micrsoft RLE Decoder
* Copyright (C) 2008 Konstantin Shishkov
*
* 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 msrledec.c
* 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 "avcodec.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;
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) ||
(row_ptr < 0)) {
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) ||
(row_ptr < 0)) {
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, pos=0, i;
uint16_t pix16;
uint32_t pix32;
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)
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;
if (line < 0)
return -1;
pos += p1;
output = pic->data[0] + line * pic->linesize[0] + pos * (depth >> 3);
continue;
}
// Copy data
if (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
int pix[4]; //original pixel
switch(depth){
case 8: pix[0] = *src++;
break;
case 16: pix16 = AV_RL16(src);
src += 2;
*(uint16_t*)pix = pix16;
break;
case 24: pix[0] = *src++;
pix[1] = *src++;
pix[2] = *src++;
break;
case 32: pix32 = AV_RL32(src);
src += 4;
*(uint32_t*)pix = pix32;
break;
}
if (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;
}
}
libavcodec/msrledec.h 0 → 100644
View file @ 44aa9771
/*
* Micrsoft RLE Decoder
* Copyright (C) 2008 Konstantin Shishkov
*
* 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
*/
#ifndef AVCODEC_MSRLEDEC_H
#define AVCODEC_MSRLEDEC_H
#include "avcodec.h"
/**
* decode stream in MS RLE format into frame
*
* @param avctx codec context
* @param pic destination frame
* @param depth bit depth
* @param data input stream
* @param data_size input size
*/
int ff_msrle_decode(AVCodecContext *avctx, AVPicture *pic, int depth,
const uint8_t* data, int data_size);
#endif /* AVCODEC_MSRLEDEC_H */
libavcodec/tscc.c
View file @ 44aa9771
......@@ -39,6 +39,7 @@
#include <stdlib.h>
#include "avcodec.h"
#include "msrledec.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
......@@ -65,118 +66,6 @@ typedef struct TsccContext {
#endif
} CamtasiaContext;
/*
*
* Decode RLE - almost identical to Windows BMP RLE8
* and enhanced to bigger color depths
*
*/
static int decode_rle(CamtasiaContext *c, unsigned int srcsize)
{
unsigned char *src = c->decomp_buf;
unsigned char *output, *output_end;
int p1, p2, line=c->height, pos=0, i;
uint16_t pix16;
uint32_t pix32;
output = c->pic.data[0] + (c->height - 1) * c->pic.linesize[0];
output_end = c->pic.data[0] + (c->height) * c->pic.linesize[0];
while(src < c->decomp_buf + srcsize) {
p1 = *src++;
if(p1 == 0) { //Escape code
p2 = *src++;
if(p2 == 0) { //End-of-line
output = c->pic.data[0] + (--line) * c->pic.linesize[0];
if (line < 0)
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;
if (line < 0)
return -1;
pos += p1;
output = c->pic.data[0] + line * c->pic.linesize[0] + pos * (c->bpp / 8);
continue;
}
// Copy data
if (output + p2 * (c->bpp / 8) > output_end) {
src += p2 * (c->bpp / 8);
continue;
}
if ((c->bpp == 8) || (c->bpp == 24)) {
for(i = 0; i < p2 * (c->bpp / 8); i++) {
*output++ = *src++;
}
// RLE8 copy is actually padded - and runs are not!
if(c->bpp == 8 && (p2 & 1)) {
src++;
}
} else if (c->bpp == 16) {
for(i = 0; i < p2; i++) {
pix16 = AV_RL16(src);
src += 2;
*(uint16_t*)output = pix16;
output += 2;
}
} else if (c->bpp == 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
int pix[4]; //original pixel
switch(c->bpp){
case 8: pix[0] = *src++;
break;
case 16: pix16 = AV_RL16(src);
src += 2;
*(uint16_t*)pix = pix16;
break;
case 24: pix[0] = *src++;
pix[1] = *src++;
pix[2] = *src++;
break;
case 32: pix32 = AV_RL32(src);
src += 4;
*(uint32_t*)pix = pix32;
break;
}
if (output + p1 * (c->bpp / 8) > output_end)
continue;
for(i = 0; i < p1; i++) {
switch(c->bpp){
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(c->avctx, AV_LOG_ERROR, "Camtasia warning: no End-of-picture code\n");
return 1;
}
/*
*
* Decode a frame
......@@ -223,7 +112,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const
if(zret != Z_DATA_ERROR)
decode_rle(c, c->zstream.avail_out);
ff_msrle_decode(avctx, &c->pic, c->bpp, c->decomp_buf, c->zstream.avail_out);
/* make the palette available on the way out */
if (c->avctx->pix_fmt == PIX_FMT_PAL8) {
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment