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avcodec/exr: fix decoding of B44 exr when all channel doesnt have the same pixel type

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This commit is contained in:
Martin Vignali 2016-06-04 15:43:48 +02:00 committed by Paul B Mahol
parent df7cd4176a
commit bc1f3dfaa3
1 changed files with 17 additions and 1 deletions
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18
libavcodec/exr.c
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@ -930,6 +930,7 @@ static int b44_uncompress(EXRContext *s, const uint8_t *src, int compressed_size
int indexHgX, indexHgY, indexOut, indexTmp;
uint16_t tmpBuffer[16]; /* B44 use 4x4 half float pixel */
int c, iY, iX, y, x;
int target_channel_offset = 0;
/* calc B44 block count */
nbB44BlockW = td->xsize / 4;
@ -943,6 +944,7 @@ static int b44_uncompress(EXRContext *s, const uint8_t *src, int compressed_size
for (c = 0; c < s->nb_channels; c++) {
for (iY = 0; iY < nbB44BlockH; iY++) {
for (iX = 0; iX < nbB44BlockW; iX++) {/* For each B44 block */
if (s->channels[c].pixel_type == EXR_HALF) {/* B44 only compress half float data */
if (stayToUncompress < 3) {
av_log(s, AV_LOG_ERROR, "Not enough data for B44A block: %d", stayToUncompress);
return AVERROR_INVALIDDATA;
@ -968,14 +970,28 @@ static int b44_uncompress(EXRContext *s, const uint8_t *src, int compressed_size
for (y = indexHgY; y < FFMIN(indexHgY + 4, td->ysize); y++) {
for (x = indexHgX; x < FFMIN(indexHgX + 4, td->xsize); x++) {
indexOut = (c * td->xsize + y * td->xsize * s->nb_channels + x) * 2;
indexOut = target_channel_offset * td->xsize + y * td->channel_line_size + 2 * x;
indexTmp = (y-indexHgY) * 4 + (x-indexHgX);
td->uncompressed_data[indexOut] = tmpBuffer[indexTmp] & 0xff;
td->uncompressed_data[indexOut + 1] = tmpBuffer[indexTmp] >> 8;
}
}
} else{/* Float or UINT 32 channel */
for (y = indexHgY; y < FFMIN(indexHgY + 4, td->ysize); y++) {
for (x = indexHgX; x < FFMIN(indexHgX + 4, td->xsize); x++) {
indexOut = target_channel_offset * td->xsize + y * td->channel_line_size + 4 * x;
memcpy(&td->uncompressed_data[indexOut], sr, 4);
sr += 4;
}
}
}
}
}
if (s->channels[c].pixel_type == EXR_HALF) {
target_channel_offset += 2;
} else {
target_channel_offset += 4;
}
}
return 0;