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lavu: add CHK_OFFS as AV_CHECK_OFFSET to check struct member offsets

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This commit is contained in:
Janne Grunau 2014-04-23 12:19:59 +02:00
parent 152b797cd6
commit a88e1d1c59
3 changed files with 15 additions and 13 deletions
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7
libavcodec/arm/asm-offsets.h
View File

@ -21,13 +21,6 @@
#ifndef AVCODEC_ARM_ASM_OFFSETS_H
#define AVCODEC_ARM_ASM_OFFSETS_H
#ifndef __ASSEMBLER__
#include <stddef.h>
#define CHK_OFFS(s, m, o) struct check_##o { \
int x_##o[offsetof(s, m) == o? 1: -1]; \
}
#endif
/* MpegEncContext */
#define Y_DC_SCALE 0xa8
#define C_DC_SCALE 0xac

14
libavcodec/arm/mpegvideo_arm.c
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@ -18,6 +18,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/internal.h"
#include "libavutil/arm/cpu.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/mpegvideo.h"
@ -25,12 +26,13 @@
#include "asm-offsets.h"
#if HAVE_NEON
CHK_OFFS(MpegEncContext, y_dc_scale, Y_DC_SCALE);
CHK_OFFS(MpegEncContext, c_dc_scale, C_DC_SCALE);
CHK_OFFS(MpegEncContext, ac_pred, AC_PRED);
CHK_OFFS(MpegEncContext, block_last_index, BLOCK_LAST_INDEX);
CHK_OFFS(MpegEncContext, inter_scantable.raster_end, INTER_SCANTAB_RASTER_END);
CHK_OFFS(MpegEncContext, h263_aic, H263_AIC);
AV_CHECK_OFFSET(MpegEncContext, y_dc_scale, Y_DC_SCALE);
AV_CHECK_OFFSET(MpegEncContext, c_dc_scale, C_DC_SCALE);
AV_CHECK_OFFSET(MpegEncContext, ac_pred, AC_PRED);
AV_CHECK_OFFSET(MpegEncContext, block_last_index, BLOCK_LAST_INDEX);
AV_CHECK_OFFSET(MpegEncContext, inter_scantable.raster_end,
INTER_SCANTAB_RASTER_END);
AV_CHECK_OFFSET(MpegEncContext, h263_aic, H263_AIC);
#endif
void ff_dct_unquantize_h263_inter_neon(MpegEncContext *s, int16_t *block,

7
libavutil/internal.h
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@ -84,6 +84,13 @@
// to be forced to tokenize __VA_ARGS__
#define E1(x) x
/* Check if the hard coded offset of a struct member still matches reality.
* Induce a compilation failure if not.
*/
#define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
int x_##o[offsetof(s, m) == o? 1: -1]; \
}
#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
uint8_t la_##v[sizeof(t s o) + (a)]; \
t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)