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exr: pxr24 decompression

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-02-27 19:29:39 +00:00
parent 9f3c90a366
commit 33240dfa9a
1 changed files with 65 additions and 1 deletions
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66
libavcodec/exr.c
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@ -37,6 +37,7 @@
#include "mathops.h"
#include "thread.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
enum ExrCompr {
EXR_RAW = 0,
@ -44,6 +45,7 @@ enum ExrCompr {
EXR_ZIP1 = 2,
EXR_ZIP16 = 3,
EXR_PIZ = 4,
EXR_PXR24 = 5,
EXR_B44 = 6,
EXR_B44A = 7,
};
@ -78,6 +80,8 @@ typedef struct EXRContext {
uint32_t ymax, ymin;
uint32_t xdelta, ydelta;
int ysize;
uint64_t scan_line_size;
int scan_lines_per_block;
@ -273,6 +277,61 @@ static int rle_uncompress(const uint8_t *src, int compressed_size,
return 0;
}
static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
int compressed_size, int uncompressed_size,
EXRThreadData *td)
{
unsigned long dest_len = uncompressed_size;
const uint8_t *in = td->tmp;
uint8_t *out;
int c, i, j;
if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
dest_len != uncompressed_size)
return AVERROR(EINVAL);
out = td->uncompressed_data;
for (i = 0; i < s->ysize; i++) {
for (c = 0; c < s->nb_channels; c++) {
EXRChannel *channel = &s->channels[c];
const uint8_t *ptr[4];
uint32_t pixel = 0;
switch (channel->pixel_type) {
case EXR_FLOAT:
ptr[0] = in;
ptr[1] = ptr[0] + s->xdelta;
ptr[2] = ptr[1] + s->xdelta;
in = ptr[2] + s->xdelta;
for (j = 0; j < s->xdelta; ++j) {
uint32_t diff = (*(ptr[0]++) << 24) |
(*(ptr[1]++) << 16) |
(*(ptr[2]++) << 8);
pixel += diff;
AV_WL32(out, pixel);
}
break;
case EXR_HALF:
ptr[0] = in;
ptr[1] = ptr[0] + s->xdelta;
in = ptr[1] + s->xdelta;
for (j = 0; j < s->xdelta; j++, out += 2) {
uint32_t diff = (*(ptr[0]++) << 8) | *(ptr[1]++);
pixel += diff;
AV_WL16(out, pixel);
}
break;
default:
av_assert1(0);
}
}
}
return 0;
}
static int decode_block(AVCodecContext *avctx, void *tdata,
int jobnr, int threadnr)
{
@ -305,7 +364,8 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
if (data_size <= 0 || data_size > buf_size)
return AVERROR_INVALIDDATA;
uncompressed_size = s->scan_line_size * FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
uncompressed_size = s->scan_line_size * s->ysize;
if ((s->compr == EXR_RAW && (data_size != uncompressed_size ||
line_offset > buf_size - uncompressed_size)) ||
(s->compr != EXR_RAW && (data_size > uncompressed_size ||
@ -324,6 +384,9 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
case EXR_ZIP16:
ret = zip_uncompress(src, data_size, uncompressed_size, td);
break;
case EXR_PXR24:
ret = pxr24_uncompress(s, src, data_size, uncompressed_size, td);
break;
case EXR_RLE:
ret = rle_uncompress(src, data_size, uncompressed_size, td);
}
@ -646,6 +709,7 @@ static int decode_frame(AVCodecContext *avctx,
case EXR_ZIP1:
s->scan_lines_per_block = 1;
break;
case EXR_PXR24:
case EXR_ZIP16:
s->scan_lines_per_block = 16;
break;