videolan/ffmpeg
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Get rid of pix_left in the 2d code, it is simpler that way.

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Originally committed as revision 16339 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-26 16:57:35 +00:00
parent a3636fa033
commit 43ba8f3545
1 changed files with 8 additions and 11 deletions
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19
libavcodec/faxcompr.c
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@ -156,7 +156,7 @@ static int decode_group3_1d_line(AVCodecContext *avctx, GetBitContext *gb,
}
static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
int pix_left, int *runs, const int *runend, const int *ref)
int width, int *runs, const int *runend, const int *ref)
{
int mode = 0, offs = 0, run = 0, saved_run = 0, t;
int run_off = *ref++;
@ -164,7 +164,7 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
runend--; // for the last written 0
while(pix_left > 0){
while(offs < width){
int cmode = get_vlc2(gb, ccitt_group3_2d_vlc.table, 9, 1);
if(cmode == -1){
av_log(avctx, AV_LOG_ERROR, "Incorrect mode VLC\n");
@ -179,12 +179,11 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
run_off += *ref++;
run = run_off - offs;
run_off += *ref++;
pix_left -= run;
if(pix_left < 0){
offs += run;
if(offs > width){
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return -1;
}
offs += run;
saved_run += run;
}else if(cmode == 1){//horizontal mode
int k;
@ -206,12 +205,11 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
return -1;
}
saved_run = 0;
pix_left -= run;
if(pix_left < 0){
offs += run;
if(offs > width){
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return -1;
}
offs += run;
mode = !mode;
}
}else if(cmode == 9 || cmode == 10){
@ -223,12 +221,11 @@ static int decode_group3_2d_line(AVCodecContext *avctx, GetBitContext *gb,
run_off += *ref++;
else
run_off -= *--ref;
pix_left -= run;
if(pix_left < 0){
offs += run;
if(offs > width){
av_log(avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return -1;
}
offs += run;
*runs++ = run + saved_run;
if(runs >= runend){
av_log(avctx, AV_LOG_ERROR, "Run overrun\n");