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Code Issues Releases Activity

dpx: use aligned line starts

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SMPTE 268M-2003 specifies that each line starts at a 4-bytes boundary.
Therefore, modify correspondingly the input buffer strides and size.

Partially fixes ticket #3692: DLAD_8b_3c_big.dpx still has inverted
colors, which might be related to endianness.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-08-13 00:37:00 +02:00 committed by Michael Niedermayer
parent b634c12cb9
commit 4ba45c189c
1 changed files with 30 additions and 12 deletions
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42
libavcodec/dpx.c
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@ -77,9 +77,9 @@ static int decode_frame(AVCodecContext *avctx,
unsigned int offset;
int magic_num, endian;
int x, y, i, ret;
int w, h, bits_per_color, descriptor, elements, packing, total_size;
int encoding;
int x, y, stride, i, ret;
int w, h, bits_per_color, descriptor, elements, packing;
int encoding, need_align = 0;
unsigned int rgbBuffer = 0;
int n_datum = 0;
@ -185,24 +185,24 @@ static int decode_frame(AVCodecContext *avctx,
switch (bits_per_color) {
case 8:
total_size = avctx->width * avctx->height * elements;
stride = avctx->width * elements;
break;
case 10:
if (!packing) {
av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
return -1;
}
total_size = (avctx->width * elements + 2) / 3 * 4 * avctx->height;
stride = (avctx->width * elements + 2) / 3 * 4;
break;
case 12:
if (!packing) {
av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
return -1;
}
total_size = 2 * avctx->width * avctx->height * elements;
stride = 2 * avctx->width * elements;
break;
case 16:
total_size = 2 * avctx->width * avctx->height * elements;
stride = 2 * avctx->width * elements;
break;
case 1:
case 32:
@ -213,6 +213,26 @@ static int decode_frame(AVCodecContext *avctx,
return AVERROR_INVALIDDATA;
}
// Table 3c: Runs will always break at scan line boundaries. Packing
// will always break to the next 32-bit word at scan-line boundaries.
// Unfortunately, the encoder produced invalid files, so attempt
// to detect it
need_align = FFALIGN(stride, 4);
if (need_align*avctx->height + (int64_t)offset > avpkt->size) {
// Alignment seems unappliable, try without
if (stride*avctx->height + (int64_t)offset > avpkt->size) {
av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
return AVERROR_INVALIDDATA;
} else {
av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline "
"alignment.\n");
need_align = 0;
}
} else {
need_align -= stride;
stride = FFALIGN(stride, 4);
}
switch (1000 * descriptor + 10 * bits_per_color + endian) {
case 6081:
case 6080:
@ -276,10 +296,6 @@ static int decode_frame(AVCodecContext *avctx,
for (i=0; i<AV_NUM_DATA_POINTERS; i++)
ptr[i] = p->data[i];
if (total_size + (int64_t)offset > avpkt->size) {
av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
return AVERROR_INVALIDDATA;
}
switch (bits_per_color) {
case 10:
for (x = 0; x < avctx->height; x++) {
@ -318,6 +334,8 @@ static int decode_frame(AVCodecContext *avctx,
// For 12 bit, ignore alpha
if (elements == 4)
buf += 2;
// Jump to next aligned position
buf += need_align;
}
for (i = 0; i < 3; i++)
ptr[i] += p->linesize[i];
@ -327,7 +345,7 @@ static int decode_frame(AVCodecContext *avctx,
elements *= 2;
case 8:
av_image_copy_plane(ptr[0], p->linesize[0],
buf, elements * avctx->width,
buf, stride,
elements * avctx->width, avctx->height);
break;
}