Diffstat (limited to 'noncore/multimedia/opieplayer2/yuv2rgb_arm4l.S') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | noncore/multimedia/opieplayer2/yuv2rgb_arm4l.S | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/noncore/multimedia/opieplayer2/yuv2rgb_arm4l.S b/noncore/multimedia/opieplayer2/yuv2rgb_arm4l.S new file mode 100644 index 0000000..f4a3395 --- a/dev/null +++ b/noncore/multimedia/opieplayer2/yuv2rgb_arm4l.S @@ -0,0 +1,192 @@ +/* WARNING : this function only works when stride_U == stride_V (I use some hacks to + not have to do too many computations at line's end)... + + C-like prototype : + void convert_yuv420_rgb565(AVPicture *picture, unsigned char *results, int w, int h) ; + +*/ + +#ifdef __arm__ + + .text + .align + + .global convert_yuv420_rgb565 +convert_yuv420_rgb565: + stmdb sp!, { r4 - r12, lr } @ all callee saved regs + ldr r7, [r0, #0] @ Y ptr + ldr r9, [r0, #4] @ U ptr + ldr r10, [r0, #8] @ V ptr + subs r10, r10, r9 @ V ptr - U ptr + ldr r8, [r0, #12] + add r8, r8, r7 @ Y + stride_Y + ldr r4, [r0, #12] @ Stride_Y + mov r4, r4, lsl #1 + sub r4, r4, r2 @ (2 * Stride_Y) - width + ldr r5, [r0, #16] @ Stride_U + sub r5, r5, r2, lsr #1 @ Stride_U - (width / 2) + ldr r6, [r0, #20] @ Stride_V + sub r6, r6, r2, lsr #1 @ Stride_V - (width / 2) + add r0, r1, r2, lsl #1 @ RGB + 1 + stmdb sp!, { r0-r10 } + @ Stack description : + @ (sp+ 0) RGB + one line + @ (sp+ 4) RGB + @ (sp+ 8) width (save) + @ (sp+12) height + @ (sp+16) (2 * stride_Y) - width + @ (sp+20) stride_U - (width / 2) + @ (sp+24) stride_V - (width / 2) !!! UNUSED !!! + @ (sp+28) Y ptr + @ (sp+32) Y ptr + one line + @ (sp+36) U ptr + @ (sp+40) V - U + mov lr, r2 @ Initialize the width counter + add r0, pc, #(const_storage-.-8) @ r0 = base pointer to the constants array + ldr r8, [r0, #(4*4)] @ r8 = multy +yuv_loop: + add r0, pc, #(const_storage-.-8) @ r0 = base pointer to the constants array + ldr r10, [sp, #28] @ r10 = Y + ldr r1, [sp, #36] @ r1 = U + ldrb r9, [r10, #0] @ r9 = *Y + ldrb r11, [r1] @ r11 = *U + add r1, r1, #1 @ r1 = U++ + ldr r2, [sp, #40] @ r2 = V - U + str r1, [sp, #36] @ store U++ + add r2, r1, r2 @ r2 = V+1 + ldrb r12, [r2, #-1] @ r12 = *V + sub r11, r11, #128 @ r11 = *U - 128 + sub r12, r12, #128 @ r12 = *V - 128 + ldr r1, [r0, #(4*0)] @ r1 = crv + mov r7, #32768 @ r7 = 32768 (for additions in MLA) + ldr r2, [r0, #(4*3)] @ r2 = -cgv + mla r6, r1, r12, r7 @ r6 = nonyc_r = crv * (*V - 128) + 32768 + ldr r3, [r0, #(4*1)] @ r3 = cbu + mla r4, r2, r12, r7 @ r4 = - cgv * (*V - 128) + 32768 + sub r9, r9, #16 @ r9 = *Y - 16 + mla r5, r3, r11, r7 @ r5 = nonyc_b = cbu * (*U - 128) + 32768 + ldr r0, [r0, #(4*2)] @ r0 = -cgu + mla r7, r8, r9, r6 @ r7 = (*Y - 16) * multy + nonyc_r + add r10, r10, #2 @ r10 = Y + 2 + mla r4, r0, r11, r4 @ r4 = nonyc_g = - cgu * (*U - 128) + r4 = - cgu * (*U - 128) - cgv * (*V - 128) + 32768 + add r0, pc, #(rb_clip-.-8) @ r0 contains the pointer to the R and B clipping array + mla r12, r8, r9, r5 @ r12 = (*Y - 16) * multy + nonyc_b + ldrb r7, [r0, r7, asr #(16+3)] @ r7 = R composant + mla r1, r8, r9, r4 @ r1 = (*Y - 16) * multy + nonyc_g + ldrb r9, [r10, #-1] @ r9 = *(Y+1) + str r10, [sp, #28] @ save Y + 2 + ldrb r12, [r0, r12, asr #(16+3)] @ r12 = B composant (and the start of the RGB word) + add r11, pc, #(g_clip-.-8) @ r11 now contains the pointer to the G clipping array + ldrb r1, [r11, r1, asr #(16+2)] @ r1 contains the G part of the RGB triplet + sub r9, r9, #16 @ r9 = *(Y+1) - 16 + mla r10, r8, r9, r6 @ r10 is the Red part of the RGB triplet + add r12, r12, r7, lsl #11 @ r12 = .GB ... + mla r7, r8, r9, r5 @ r7 is the Blue part of the RGB triplet + add r12, r12, r1, lsl #5 @ r12 = RGB ... (ie the first pixel (half-word) is done) + mla r2, r8, r9, r4 @ r2 is the Green part of the RGB triplet + ldrb r10, [r0, r10, asr #(16+3)] @ r10 = R composant + ldrb r7, [r0, r7, asr #(16+3)] @ r7 = B composant + ldr r1, [sp, #32] @ r1 = Ynext + ldrb r2, [r11, r2, asr #(16+2)] @ r2 = G composant + ldrb r9, [r1] @ r9 = *Ynext + add r12, r12, r2, lsl #(5+16) @ r12 = RGB .G. + sub r9, r9, #16 @ r9 = *Ynext - 16 + mla r2, r8, r9, r4 @ r2 is the Green part of the RGB triplet + add r12, r12, r7, lsl #(0+16) @ r12 = RGB .GB + mla r7, r8, r9, r5 @ r7 is the Blue part of the RGB triplet + add r12, r12, r10, lsl #(11+16) @ r12 = RGB RGB + ldr r3, [sp, #4] @ r3 = RGB + mla r10, r8, r9, r6 @ r10 is the Red part of the RGB triplet + str r12, [r3] @ store the rgb pixel at *RGB + add r3, r3, #4 @ r3 = RGB++ (ie next double-pixel) + str r3, [sp, #4] @ store the RGB pointer + ldrb r9, [r1, #1] @ r9 = *(Ynext+1) + add r1, r1, #2 @ r1 = Ynext + 2 + sub r9, r9, #16 @ r9 = *(Ynext+1) - 16 + ldrb r12, [r0, r7, asr #(16+3)] @ r12 = ..B ... + ldrb r10, [r0, r10, asr #(16+3)] @ r10 = B composant + mla r7, r8, r9, r5 @ r7 is the Blue part of the RGB triplet + add r12, r12, r10, lsl #11 @ r12 = R.B ... + ldrb r2, [r11, r2, asr #(16+2)] @ r2 = G composant + mla r10, r8, r9, r6 @ r10 is the Red part of the RGB triplet + add r12, r12, r2, lsl #5 @ r12 = RGB ... + mla r2, r8, r9, r4 @ r2 is the Green part of the RGB triplet + ldrb r7, [r0, r7, asr #(16+3)] @ r7 = B composant + str r1, [sp, #32] @ store the increased Ynext pointer + add r12, r12, r7, lsl #(16+0) @ r12 = RGB ..B + ldrb r10, [r0, r10, asr #(16+3)] @ r10 = R composant + ldr r3, [sp, #0] @ r3 = RGBnext pointer + add r12, r12, r10, lsl #(16+11) @ r12 = RGB R.B + ldrb r2, [r11, r2, asr #(16+2)] @ r2 = G composant + add r3, r3, #4 @ r3 = next pixel on the RGBnext line + add r12, r12, r2, lsl #(16+5) @ r12 = RGB RGB + str r12, [r3, #-4] @ store the next pixel + str r3, [sp, #0] @ store the increased 'next line' pixel pointer + subs lr, lr, #2 @ decrement the line counter + bne yuv_loop @ and restart if not at the end of the line + + ldr r0, [sp, #8] @ r0 = saved width + ldr r1, [sp, #0] @ r1 = RGBnext pointer + mov lr, r0 @ lr = saved width (to restart the line counter) + str r1, [sp, #4] @ current RGBnext pointer is next iteration RGB pointer + add r1, r1, r0, lsl #1 @ r1 = update RGBnext to next line + str r1, [sp, #0] @ store updated RGBnext pointer + + ldr r3, [sp, #16] @ r3 = (2 * stride_Y) - width + ldr r4, [sp, #28] @ r4 = Y ptr + ldr r5, [sp, #32] @ r5 = Ynext ptr + add r4, r4, r3 @ r4 = Y ptr for the next two lines + add r5, r5, r3 @ r5 = Ynext ptr for the next two lines + str r4, [sp, #28] @ store updated Y pointer + str r5, [sp, #32] @ store update Ynext pointer + + ldr r1, [sp, #20] @ r1 = stride_U - (width / 2) + ldr r2, [sp, #36] @ r2 = U ptr + + ldr r6, [sp, #12] @ get height counter + + add r2, r2, r1 @ update U ptr + str r2, [sp, #36] @ store updated U ptr (and update 'V' at the same time :-) ) + + subs r6, r6, #2 + str r6, [sp, #12] + bne yuv_loop + + @ Exit cleanly :-) + add sp, sp, #(11*4) @ remove all custom things from stack + ldmia sp!, { r4 - r12, pc } @ restore callee saved regs and return + + +const_storage: + @ In order : crv, cbu, - cgu, - cgv, multy + .word 0x00019895, 0x00020469, 0xffff9bb5, 0xffff2fe1, 0x00012A15 +rb_clip_dummy: + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 +rb_clip: + .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f + .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f + .byte 0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f + .byte 0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f + .byte 0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f,0x1f +g_clip_dummy: + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 + .byte 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 +g_clip: + .byte 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f + .byte 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f + .byte 0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,0x28,0x29,0x2a,0x2b,0x2c,0x2d,0x2e,0x2f + .byte 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + .byte 0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f + +#endif |