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

Originally committed as revision 15356 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Kostya Shishkov 17 years ago
parent
f7e5b0cc8f
commit
44aa9771c9
6 changed files with 309 additions and 387 deletions
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  1. +3
    -3
      libavcodec/Makefile
  2. +2
    -73
      libavcodec/aasc.c
  3. +8
    -198
      libavcodec/msrle.c
  4. +254
    -0
      libavcodec/msrledec.c
  5. +40
    -0
      libavcodec/msrledec.h
  6. +2
    -113
      libavcodec/tscc.c

+ 3
- 3
libavcodec/Makefile View File

@@ -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


+ 2
- 73
libavcodec/aasc.c View File

@@ -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;


+ 8
- 198
libavcodec/msrle.c View File

@@ -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;



+ 254
- 0
libavcodec/msrledec.c View File

@@ -0,0 +1,254 @@
/*
* 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;
}
}


+ 40
- 0
libavcodec/msrledec.h View File

@@ -0,0 +1,40 @@
/*
* 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 */


+ 2
- 113
libavcodec/tscc.c View File

@@ -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) {


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