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Avoid huge array for rgb ljpeg on the stack. 

Code tested with an ljpeg i had laying around.

Originally committed as revision 20433 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-11-02 14:12:25 +00:00
parent e47ca4f798
commit ad9feac9fb
2 changed files with 8 additions and 3 deletions
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8
libavcodec/mjpegdec.c
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@ -616,13 +616,13 @@ static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_
static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
int i, mb_x, mb_y;
uint16_t buffer[32768][4];
uint16_t (*buffer)[4];
int left[3], top[3], topleft[3];
const int linesize= s->linesize[0];
const int mask= (1<<s->bits)-1;
if((unsigned)s->mb_width > 32768) //dynamic alloc
return -1;
av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
buffer= s->ljpeg_buffer;
for(i=0; i<3; i++){
buffer[0][i]= 1 << (s->bits + point_transform - 1);
@ -1504,6 +1504,8 @@ av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
av_free(s->buffer);
av_free(s->qscale_table);
av_freep(&s->ljpeg_buffer);
s->ljpeg_buffer_size=0;
for(i=0;i<2;i++) {
for(j=0;j<4;j++)

3
libavcodec/mjpegdec.h
View File

@ -102,6 +102,9 @@ typedef struct MJpegDecodeContext {
int cur_scan; /* current scan, used by JPEG-LS */
int flipped; /* true if picture is flipped */
uint16_t (*ljpeg_buffer)[4];
unsigned int ljpeg_buffer_size;
} MJpegDecodeContext;
int ff_mjpeg_decode_init(AVCodecContext *avctx);