diff options
Diffstat (limited to 'apps/plugins/mpegplayer/idct.c')
| -rw-r--r-- | apps/plugins/mpegplayer/idct.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/idct.c b/apps/plugins/mpegplayer/idct.c index 8a0b56ea22..5f37d7688c 100644 --- a/apps/plugins/mpegplayer/idct.c +++ b/apps/plugins/mpegplayer/idct.c @@ -47,8 +47,34 @@ void (* mpeg2_idct_add) (int last, int16_t * block, * to +-3826 - this is the worst case for a column IDCT where the * column inputs are 16-bit values. */ +#ifdef CPU_COLDFIRE +static inline unsigned CLIP(int value) +{ + asm ( /* Note: Uses knowledge that only the low byte of the result is used */ + "cmp.l #255,%[v] \n" /* overflow? */ + "bls.b 1f \n" /* no: return value */ + "spl.b %[v] \n" /* yes: set low byte to appropriate boundary */ + "1: \n" + : /* outputs */ + [v]"+d"(value) + ); + return value; +} +#elif defined CPU_ARM +static inline unsigned CLIP(int value) +{ + asm ( /* Note: Uses knowledge that only the low byte of the result is used */ + "cmp %[v], #255 \n" + "mvnhi %[v], %[v], asr #31 \n" + : /* outputs */ + [v]"+r"(value) + ); + return value; +} +#else uint8_t mpeg2_clip[3840 * 2 + 256] IBSS_ATTR; #define CLIP(i) ((mpeg2_clip + 3840)[i]) +#endif #if 0 #define BUTTERFLY(t0,t1,W0,W1,d0,d1) \ @@ -275,8 +301,10 @@ void mpeg2_idct_init (uint32_t accel) mpeg2_idct_copy = mpeg2_idct_copy_c; mpeg2_idct_add = mpeg2_idct_add_c; +#if !defined(CPU_COLDFIRE) && !defined(CPU_ARM) for (i = -3840; i < 3840 + 256; i++) CLIP(i) = (i < 0) ? 0 : ((i > 255) ? 255 : i); +#endif for (i = 0; i < 64; i++) { j = mpeg2_scan_norm[i]; mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2); |