virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

h264: move q0 scan tables into context

Browse Source 
This fixes out of global array reads.
The alternative solutions of checking the index or modifying the VLC tables
to prevent the index going outside are each about 1-2 cpu cyclces slower
per coded 4x4 block.
The alternative of padding the global tables directly is more ugly and
moving them to the context should benefit cache locality.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-05-31 20:19:56 +02:00
parent 18b46a494e
commit b7d1488393
3 changed files with 18 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
libavcodec/h264.c
View File

@ -2719,19 +2719,19 @@ static void init_scan_tables(H264Context *h)
#undef T
}
if (h->sps.transform_bypass) { // FIXME same ugly
h->zigzag_scan_q0 = zigzag_scan;
h->zigzag_scan8x8_q0 = ff_zigzag_direct;
h->zigzag_scan8x8_cavlc_q0 = zigzag_scan8x8_cavlc;
h->field_scan_q0 = field_scan;
h->field_scan8x8_q0 = field_scan8x8;
h->field_scan8x8_cavlc_q0 = field_scan8x8_cavlc;
memcpy(h->zigzag_scan_q0 , zigzag_scan , sizeof(h->zigzag_scan_q0 ));
memcpy(h->zigzag_scan8x8_q0 , ff_zigzag_direct , sizeof(h->zigzag_scan8x8_q0 ));
memcpy(h->zigzag_scan8x8_cavlc_q0 , zigzag_scan8x8_cavlc , sizeof(h->zigzag_scan8x8_cavlc_q0));
memcpy(h->field_scan_q0 , field_scan , sizeof(h->field_scan_q0 ));
memcpy(h->field_scan8x8_q0 , field_scan8x8 , sizeof(h->field_scan8x8_q0 ));
memcpy(h->field_scan8x8_cavlc_q0 , field_scan8x8_cavlc , sizeof(h->field_scan8x8_cavlc_q0 ));
} else {
h->zigzag_scan_q0 = h->zigzag_scan;
h->zigzag_scan8x8_q0 = h->zigzag_scan8x8;
h->zigzag_scan8x8_cavlc_q0 = h->zigzag_scan8x8_cavlc;
h->field_scan_q0 = h->field_scan;
h->field_scan8x8_q0 = h->field_scan8x8;
h->field_scan8x8_cavlc_q0 = h->field_scan8x8_cavlc;
memcpy(h->zigzag_scan_q0 , h->zigzag_scan , sizeof(h->zigzag_scan_q0 ));
memcpy(h->zigzag_scan8x8_q0 , h->zigzag_scan8x8 , sizeof(h->zigzag_scan8x8_q0 ));
memcpy(h->zigzag_scan8x8_cavlc_q0 , h->zigzag_scan8x8_cavlc , sizeof(h->zigzag_scan8x8_cavlc_q0));
memcpy(h->field_scan_q0 , h->field_scan , sizeof(h->field_scan_q0 ));
memcpy(h->field_scan8x8_q0 , h->field_scan8x8 , sizeof(h->field_scan8x8_q0 ));
memcpy(h->field_scan8x8_cavlc_q0 , h->field_scan8x8_cavlc , sizeof(h->field_scan8x8_cavlc_q0 ));
}
}

12
libavcodec/h264.h
View File

@ -421,12 +421,12 @@ typedef struct H264Context {
uint8_t field_scan[16];
uint8_t field_scan8x8[64];
uint8_t field_scan8x8_cavlc[64];
const uint8_t *zigzag_scan_q0;
const uint8_t *zigzag_scan8x8_q0;
const uint8_t *zigzag_scan8x8_cavlc_q0;
const uint8_t *field_scan_q0;
const uint8_t *field_scan8x8_q0;
const uint8_t *field_scan8x8_cavlc_q0;
uint8_t zigzag_scan_q0[16];
uint8_t zigzag_scan8x8_q0[64];
uint8_t zigzag_scan8x8_cavlc_q0[64];
uint8_t field_scan_q0[16];
uint8_t field_scan8x8_q0[64];
uint8_t field_scan8x8_cavlc_q0[64];
int x264_build;

5
libavcodec/h264data.h
View File

@ -57,7 +57,6 @@ static const uint8_t zigzag_scan[16+1] = {
1 + 1 * 4, 2 + 0 * 4, 3 + 0 * 4, 2 + 1 * 4,
1 + 2 * 4, 0 + 3 * 4, 1 + 3 * 4, 2 + 2 * 4,
3 + 1 * 4, 3 + 2 * 4, 2 + 3 * 4, 3 + 3 * 4,
0,
};
static const uint8_t field_scan[16+1] = {
@ -65,7 +64,6 @@ static const uint8_t field_scan[16+1] = {
0 + 3 * 4, 1 + 1 * 4, 1 + 2 * 4, 1 + 3 * 4,
2 + 0 * 4, 2 + 1 * 4, 2 + 2 * 4, 2 + 3 * 4,
3 + 0 * 4, 3 + 1 * 4, 3 + 2 * 4, 3 + 3 * 4,
0,
};
static const uint8_t luma_dc_zigzag_scan[16] = {
@ -112,7 +110,6 @@ static const uint8_t zigzag_scan8x8_cavlc[64+1] = {
1 + 4 * 8, 2 + 4 * 8, 6 + 0 * 8, 4 + 3 * 8,
0 + 7 * 8, 4 + 4 * 8, 7 + 2 * 8, 3 + 6 * 8,
5 + 5 * 8, 6 + 5 * 8, 6 + 6 * 8, 7 + 7 * 8,
0,
};
static const uint8_t field_scan8x8[64+1] = {
@ -132,7 +129,6 @@ static const uint8_t field_scan8x8[64+1] = {
7 + 0 * 8, 7 + 1 * 8, 6 + 4 * 8, 6 + 5 * 8,
6 + 6 * 8, 6 + 7 * 8, 7 + 2 * 8, 7 + 3 * 8,
7 + 4 * 8, 7 + 5 * 8, 7 + 6 * 8, 7 + 7 * 8,
0,
};
static const uint8_t field_scan8x8_cavlc[64+1] = {
@ -152,7 +148,6 @@ static const uint8_t field_scan8x8_cavlc[64+1] = {
1 + 7 * 8, 3 + 2 * 8, 2 + 7 * 8, 4 + 2 * 8,
3 + 7 * 8, 5 + 2 * 8, 4 + 7 * 8, 5 + 4 * 8,
6 + 3 * 8, 6 + 5 * 8, 7 + 3 * 8, 7 + 7 * 8,
0,
};
typedef struct IMbInfo {