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avcodec/dpx: Support for RGB 12-bit packed decoding

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Limited to widths multiple of 8 (RGB) due to lack of test files for such corner case

This partially fixes ticket #5639

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Jérôme Martinez 2018-04-10 18:20:23 +02:00 committed by Michael Niedermayer
parent b5c877a554
commit b5788e7025
1 changed files with 64 additions and 3 deletions
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67
libavcodec/dpx.c
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@ -65,6 +65,38 @@ static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
return *lbuf & 0x3FF;
}
static uint16_t read12in32(const uint8_t **ptr, uint32_t * lbuf,
int * n_datum, int is_big)
{
if (*n_datum)
(*n_datum)--;
else {
*lbuf = read32(ptr, is_big);
*n_datum = 7;
}
switch (*n_datum){
case 7: return *lbuf & 0xFFF;
case 6: return (*lbuf >> 12) & 0xFFF;
case 5: {
uint32_t c = *lbuf >> 24;
*lbuf = read32(ptr, is_big);
c |= *lbuf << 8;
return c & 0xFFF;
}
case 4: return (*lbuf >> 4) & 0xFFF;
case 3: return (*lbuf >> 16) & 0xFFF;
case 2: {
uint32_t c = *lbuf >> 28;
*lbuf = read32(ptr, is_big);
c |= *lbuf << 4;
return c & 0xFFF;
}
case 1: return (*lbuf >> 8) & 0xFFF;
default: return *lbuf >> 20;
}
}
static int decode_frame(AVCodecContext *avctx,
void *data,
int *got_frame,
@ -201,10 +233,27 @@ static int decode_frame(AVCodecContext *avctx,
break;
case 12:
if (!packing) {
av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
return -1;
int tested = 0;
if (descriptor == 50 && endian && (avctx->width%8) == 0) { // Little endian and widths not a multiple of 8 need tests
tested = 1;
}
if (!tested) {
av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
return -1;
}
}
stride = avctx->width * elements;
if (packing) {
stride *= 2;
} else {
stride *= 3;
if (stride % 8) {
stride /= 8;
stride++;
stride *= 8;
}
stride /= 2;
}
stride = 2 * avctx->width * elements;
break;
case 16:
stride = 2 * avctx->width * elements;
@ -349,6 +398,7 @@ static int decode_frame(AVCodecContext *avctx,
(uint16_t*)ptr[2],
(uint16_t*)ptr[3]};
for (y = 0; y < avctx->width; y++) {
if (packing) {
if (elements >= 3)
*dst[2]++ = read16(&buf, endian) >> 4;
*dst[0] = read16(&buf, endian) >> 4;
@ -357,6 +407,17 @@ static int decode_frame(AVCodecContext *avctx,
*dst[1]++ = read16(&buf, endian) >> 4;
if (elements == 4)
*dst[3]++ = read16(&buf, endian) >> 4;
} else {
*dst[2]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
*dst[0]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
*dst[1]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
if (elements == 4)
*dst[3]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
}
}
for (i = 0; i < elements; i++)
ptr[i] += p->linesize[i];