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avcodec/me_cmp: Fix crashes on ARM due to misalignment

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Adds a diff_pixels_unaligned()

Fixes: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=872503

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit bc488ec28aec4bc91ba47283c49c9f7f25696eaa)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-19 23:38:58 +02:00
parent 0b37ae2ae4
commit 079849f40c
4 changed files with 13 additions and 5 deletions
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10
libavcodec/me_cmp.c
View File

@ -555,7 +555,7 @@ static int dct_sad8x8_c(MpegEncContext *s, uint8_t *src1,
av_assert2(h == 8);
s->pdsp.diff_pixels(temp, src1, src2, stride);
s->pdsp.diff_pixels_unaligned(temp, src1, src2, stride);
s->fdsp.fdct(temp);
return s->mecc.sum_abs_dctelem(temp);
}
@ -595,7 +595,7 @@ static int dct264_sad8x8_c(MpegEncContext *s, uint8_t *src1,
int16_t dct[8][8];
int i, sum = 0;
s->pdsp.diff_pixels(dct[0], src1, src2, stride);
s->pdsp.diff_pixels_unaligned(dct[0], src1, src2, stride);
#define SRC(x) dct[i][x]
#define DST(x, v) dct[i][x] = v
@ -622,7 +622,7 @@ static int dct_max8x8_c(MpegEncContext *s, uint8_t *src1,
av_assert2(h == 8);
s->pdsp.diff_pixels(temp, src1, src2, stride);
s->pdsp.diff_pixels_unaligned(temp, src1, src2, stride);
s->fdsp.fdct(temp);
for (i = 0; i < 64; i++)
@ -641,7 +641,7 @@ static int quant_psnr8x8_c(MpegEncContext *s, uint8_t *src1,
av_assert2(h == 8);
s->mb_intra = 0;
s->pdsp.diff_pixels(temp, src1, src2, stride);
s->pdsp.diff_pixels_unaligned(temp, src1, src2, stride);
memcpy(bak, temp, 64 * sizeof(int16_t));
@ -744,7 +744,7 @@ static int bit8x8_c(MpegEncContext *s, uint8_t *src1, uint8_t *src2,
av_assert2(h == 8);
s->pdsp.diff_pixels(temp, src1, src2, stride);
s->pdsp.diff_pixels_unaligned(temp, src1, src2, stride);
s->block_last_index[0 /* FIXME */] =
last =

1
libavcodec/pixblockdsp.c
View File

@ -55,6 +55,7 @@ av_cold void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx)
{
const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
c->diff_pixels_unaligned =
c->diff_pixels = diff_pixels_c;
switch (avctx->bits_per_raw_sample) {

5
libavcodec/pixblockdsp.h
View File

@ -31,6 +31,11 @@ typedef struct PixblockDSPContext {
const uint8_t *s1 /* align 8 */,
const uint8_t *s2 /* align 8 */,
int stride);
void (*diff_pixels_unaligned)(int16_t *av_restrict block /* align 16 */,
const uint8_t *s1,
const uint8_t *s2,
int stride);
} PixblockDSPContext;
void ff_pixblockdsp_init(PixblockDSPContext *c, AVCodecContext *avctx);

2
libavcodec/x86/pixblockdsp_init.c
View File

@ -39,12 +39,14 @@ av_cold void ff_pixblockdsp_init_x86(PixblockDSPContext *c,
if (EXTERNAL_MMX(cpu_flags)) {
if (!high_bit_depth)
c->get_pixels = ff_get_pixels_mmx;
c->diff_pixels_unaligned =
c->diff_pixels = ff_diff_pixels_mmx;
}
if (EXTERNAL_SSE2(cpu_flags)) {
if (!high_bit_depth)
c->get_pixels = ff_get_pixels_sse2;
c->diff_pixels_unaligned =
c->diff_pixels = ff_diff_pixels_sse2;
}
}