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tiffdec: support LZW compression with inverted FillOrder

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This commit is contained in:
Piotr Bandurski 2012-12-20 15:36:44 +00:00 committed by Paul B Mahol
parent 217bdd08e3
commit 17714adbf8
1 changed files with 14 additions and 0 deletions
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14
libavcodec/tiff.c
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@ -62,6 +62,9 @@ typedef struct TiffContext {
int stripsizesoff, stripsize, stripoff, strippos;
LZWState *lzw;
uint8_t *deinvert_buf;
int deinvert_buf_size;
int geotag_count;
TiffGeoTag *geotags;
} TiffContext;
@ -449,6 +452,16 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
}
#endif
if (s->compr == TIFF_LZW) {
if (s->fill_order) {
int i;
av_fast_padded_malloc(&s->deinvert_buf, &s->deinvert_buf_size, size);
if (!s->deinvert_buf)
return AVERROR(ENOMEM);
for (i = 0; i < size; i++)
s->deinvert_buf[i] = ff_reverse[src[i]];
src = s->deinvert_buf;
ssrc = src;
}
if (ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
return -1;
@ -1192,6 +1205,7 @@ static av_cold int tiff_end(AVCodecContext *avctx)
free_geotags(s);
ff_lzw_decode_close(&s->lzw);
av_freep(&s->deinvert_buf);
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;