ARM平台YUV转RGB888（转）
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ARM平台YUV转RGB888（转）
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前段時間，公司有個嵌入式的項目，我做的其中有一項是yuv視頻到rgb888圖像的轉換。我主要是參照一位牛人的博客做的：http://blog.csdn.net/housisong/archive/2007/10/31/1859084.aspx /****************************************YUV422P_To_RGB24.c**************************/?? //模塊功能：將YUV422_PLANAR圖像數據轉換成RGB24格式 ?? typedef?unsigned?char?BYTE;?//?[0..255] ?? /*? ?*?接口說明：? ?*?功能：構建查詢表，轉換模塊運行前必須進行的初始化操作? ?*/?? void?YUV422P_To_RGB24_init();?? /*? ?*接口說明：? ?*功能：將YUV422P圖像數據轉換成RGB24格式? ?*參數：? ?*????????????pY:?YUV422P圖像數據Y的起始指針? ?*????????????pU:?YUV422P圖像數據U的起始指針? ?*????????????pV:?YUV422P圖像數據V的起始指針? ?*????????DstPic:?轉換成的RGB24圖像數據的起始指針? ?*?????????width:?圖像寬度? ?*????????height:?圖像高度? ?*返回值：成功返回0，失敗返回-1? ?*注意：DstPic所指向的緩沖區必須事先分配好，其大小應該為?width*height*3? ?*/?? int?YUV422P_To_RGB24(BYTE*?pY,?BYTE*?pU,?BYTE*?pV,?BYTE*?DstPic,?int?width,?int?height);?? /****************************************YUV422P_To_RGB24.c**************************/ //模塊功能：將YUV422_PLANAR圖像數據轉換成RGB24格式 typedef unsigned char BYTE; // [0..255] /* * 接口說明： * 功能：構建查詢表，轉換模塊運行前必須進行的初始化操作 */ void YUV422P_To_RGB24_init(); /* *接口說明： *功能：將YUV422P圖像數據轉換成RGB24格式 *參數： * pY: YUV422P圖像數據Y的起始指針 * pU: YUV422P圖像數據U的起始指針 * pV: YUV422P圖像數據V的起始指針 * DstPic: 轉換成的RGB24圖像數據的起始指針 * width: 圖像寬度 * height: 圖像高度 *返回值：成功返回0，失敗返回-1 *注意：DstPic所指向的緩沖區必須事先分配好，其大小應該為 width*height*3 */ int YUV422P_To_RGB24(BYTE* pY, BYTE* pU, BYTE* pV, BYTE* DstPic, int width, int height);? //使用整數運算(定點數運算)來代替浮點運算 ?? const?int?csY_coeff_16?=?1.164383?*?(1?<<?16);?? const?int?csU_blue_16?=?2.017232?*?(1?<<?16);?? const?int?csU_green_16?=?(-0.391762)?*?(1?<<?16);?? const?int?csV_green_16?=?(-0.812968)?*?(1?<<?16);?? const?int?csV_red_16?=?1.596027?*?(1?<<?16);?? //顏色查表 ?? static?BYTE?_color_table[256?*?3];?? static?const?BYTE*?color_table?=?&_color_table[256];?? //查表 ?? static?int?Ym_tableEx[256];?? static?int?Um_blue_tableEx[256];?? static?int?Um_green_tableEx[256];?? static?int?Vm_green_tableEx[256];?? static?int?Vm_red_tableEx[256];?? //顏色飽和函數 ?? inline?long?border_color(long?color)?{?? ????if?(color?>?255)?? ????????return?255;?? ????else?if?(color?<?0)?? ????????return?0;?? ????else?? ????????return?color;?? }?? //采用查找表進行計算時，必須運行的初始化函數 ?? void?YUV422P_To_RGB24_init()?{?? ????int?i;?? ????for?(i?=?0;?i?<?256?*?3;?++i)?? ????????_color_table[i]?=?border_color(i?-?256);?? ????for?(i?=?0;?i?<?256;?++i)?{?? ????????Ym_tableEx[i]?=?(csY_coeff_16?*?(i?-?16))?>>?16;?? ????????Um_blue_tableEx[i]?=?(csU_blue_16?*?(i?-?128))?>>?16;?? ????????Um_green_tableEx[i]?=?(csU_green_16?*?(i?-?128))?>>?16;?? ????????Vm_green_tableEx[i]?=?(csV_green_16?*?(i?-?128))?>>?16;?? ????????Vm_red_tableEx[i]?=?(csV_red_16?*?(i?-?128))?>>?16;?? ????}?? }?? inline?void?YUVToRGB24_Table(BYTE?*p,?const?BYTE?Y0,?const?BYTE?Y1,?? ????????const?BYTE?U,?const?BYTE?V)?{?? ????int?Ye0?=?Ym_tableEx[Y0];?? ????int?Ye1?=?Ym_tableEx[Y1];?? ????int?Ue_blue?=?Um_blue_tableEx[U];?? ????int?Ue_green?=?Um_green_tableEx[U];?? ????int?Ve_green?=?Vm_green_tableEx[V];?? ????int?Ve_red?=?Vm_red_tableEx[V];?? ????int?UeVe_green?=?Ue_green?+?Ve_green;?? ????*p?=?color_table[(Ye0?+?Ve_red)];?? ????*(p?+?1)?=?color_table[(Ye0?+?UeVe_green)];?? ????*(p?+?2)?=?color_table[(Ye0?+?Ue_blue)];?? ????*(p?+?3)?=?color_table[(Ye1?+?Ve_red)];?? ????*(p?+?4)?=?color_table[(Ye1?+?UeVe_green)];?? ????*(p?+?5)?=?color_table[(Ye1?+?Ue_blue)];?? }?? int?YUV420P_To_RGB24(BYTE*?pY,?BYTE*?pU,?BYTE*?pV,?BYTE*?DstPic,?int?width,?? ????????int?height)?{?? ????int?y,?x,?x_uv;?? ????BYTE*?pDstLine?=?DstPic;?? ????if?((width?%?2)?!=?0?||?(height?%?2)?!=?0)?? ????????return?(-1);?? ????for?(y?=?0;?y?<?height;?++y)?{?? ????????//DECODE_PlanarYUV211_Common_line(pDstLine,?pY,?pU,?pV,width); ?? ????????for?(x?=?0;?x?<?width;?x?+=?2)?{?? ????????????x_uv?=?x?>>?1;?? ????????????YUVToRGB24_Table(&pDstLine[x?*?3],?pY[x],?pY[x?+?1],?pU[x_uv],?? ????????????????????pV[x_uv]);?? ????????}?? ????????pDstLine?+=?width?*?3;?//RGB888 ?? ????????pY?+=?width;?//YUV422 ?? ????????if?(y?%?2?==?1)?{?? ????????????pU?+=?width?/?2;?? ????????????pV?+=?width?/?2;?? ????????}?? ????}?? ????return?0;?? }?? //使用整數運算(定點數運算)來代替浮點運算 const int csY_coeff_16 = 1.164383 * (1 << 16); const int csU_blue_16 = 2.017232 * (1 << 16); const int csU_green_16 = (-0.391762) * (1 << 16); const int csV_green_16 = (-0.812968) * (1 << 16); const int csV_red_16 = 1.596027 * (1 << 16); //顏色查表 static BYTE _color_table[256 * 3]; static const BYTE* color_table = &_color_table[256]; //查表 static int Ym_tableEx[256]; static int Um_blue_tableEx[256]; static int Um_green_tableEx[256]; static int Vm_green_tableEx[256]; static int Vm_red_tableEx[256]; //顏色飽和函數 inline long border_color(long color) { if (color > 255) return 255; else if (color < 0) return 0; else return color; } //采用查找表進行計算時，必須運行的初始化函數 void YUV422P_To_RGB24_init() { int i; for (i = 0; i < 256 * 3; ++i) _color_table[i] = border_color(i - 256); for (i = 0; i < 256; ++i) { Ym_tableEx[i] = (csY_coeff_16 * (i - 16)) >> 16; Um_blue_tableEx[i] = (csU_blue_16 * (i - 128)) >> 16; Um_green_tableEx[i] = (csU_green_16 * (i - 128)) >> 16; Vm_green_tableEx[i] = (csV_green_16 * (i - 128)) >> 16; Vm_red_tableEx[i] = (csV_red_16 * (i - 128)) >> 16; } } inline void YUVToRGB24_Table(BYTE *p, const BYTE Y0, const BYTE Y1, const BYTE U, const BYTE V) { int Ye0 = Ym_tableEx[Y0]; int Ye1 = Ym_tableEx[Y1]; int Ue_blue = Um_blue_tableEx[U]; int Ue_green = Um_green_tableEx[U]; int Ve_green = Vm_green_tableEx[V]; int Ve_red = Vm_red_tableEx[V]; int UeVe_green = Ue_green + Ve_green; *p = color_table[(Ye0 + Ve_red)]; *(p + 1) = color_table[(Ye0 + UeVe_green)]; *(p + 2) = color_table[(Ye0 + Ue_blue)]; *(p + 3) = color_table[(Ye1 + Ve_red)]; *(p + 4) = color_table[(Ye1 + UeVe_green)]; *(p + 5) = color_table[(Ye1 + Ue_blue)]; } int YUV420P_To_RGB24(BYTE* pY, BYTE* pU, BYTE* pV, BYTE* DstPic, int width, int height) { int y, x, x_uv; BYTE* pDstLine = DstPic; if ((width % 2) != 0 || (height % 2) != 0) return (-1); for (y = 0; y < height; ++y) { //DECODE_PlanarYUV211_Common_line(pDstLine, pY, pU, pV,width); for (x = 0; x < width; x += 2) { x_uv = x >> 1; YUVToRGB24_Table(&pDstLine[x * 3], pY[x], pY[x + 1], pU[x_uv], pV[x_uv]); } pDstLine += width * 3; //RGB888 pY += width; //YUV422 if (y % 2 == 1) { pU += width / 2; pV += width / 2; } } return 0; }? extern?int?YUVToRGB24_Assemble(unsigned?char?*pDstLine,?unsigned?char?**yuv,?int?width);?? //使用整數運算(定點數運算)來代替浮點運算 ?? const?int?csY_coeff_16?=?1.164383?*?(1?<<?16);?? const?int?csU_blue_16?=?2.017232?*?(1?<<?16);?? const?int?csU_green_16?=?(-0.391762)?*?(1?<<?16);?? const?int?csV_green_16?=?(-0.812968)?*?(1?<<?16);?? const?int?csV_red_16?=?1.596027?*?(1?<<?16);?? //查表 ?? int??Ym_tableEx[256];?? int??Um_blue_tableEx[256];?? int??Um_green_tableEx[256];?? int??Vm_green_tableEx[256];?? int??Vm_red_tableEx[256];?? //采用查找表進行計算時，必須運行的初始化函數 ?? void?YUV422P_To_RGB24_init()?? {?? ????int?i;?? ????for?(i?=?0;?i?<?256;?++i)?? ????{?? ????????Ym_tableEx[i]=(csY_coeff_16?*?(i?-?16)?)>>16;?? ????????????Um_blue_tableEx[i]=(csU_blue_16?*?(i?-?128)?)>>16;?? ????????Um_green_tableEx[i]=(csU_green_16?*?(i?-?128)?)>>16;???????????????????? ????????Vm_green_tableEx[i]=(csV_green_16?*?(i?-?128)?)>>16;?? ????????????Vm_red_tableEx[i]=(csV_red_16?*?(i?-?128)?)>>16;?? ????}?? }?? int?YUV420P_To_RGB24(BYTE*?pY,?BYTE*?pU,?BYTE*?pV,?BYTE*?DstPic,?int?width,?int?height)?? {?? ????int?y;?? ????BYTE*?pDstLine?=?DstPic;?? ????BYTE*?yuv[3];?? ?????? ????if?((width?%?8)!=0)?? ????????return(-1);?? ????yuv[0]?=?pY;?? ????yuv[1]?=?pU;?? ????yuv[2]?=?pV;?? ????for?(y?=?height;?y?>?0;?--y)?? ????{?? ????????YUVToRGB24_Assemble(pDstLine,?yuv,?width);?//decoder?a?line?with?asm?function?in?YUVToRGB24_Assemble.s ?? ????????pDstLine?+=?width?*?3;??????//RGB888 ?? ????????yuv[0]?+=?width;????????//YUV422 ?? ????????if(y?%?2?==?1)?{?? ????????????yuv[1]?+=?width?>>?1;?? ????????????yuv[2]?+=?width?>>?1;?? ????????}?? ????}?? ????return?0;?? }?? extern int YUVToRGB24_Assemble(unsigned char *pDstLine, unsigned char **yuv, int width); //使用整數運算(定點數運算)來代替浮點運算 const int csY_coeff_16 = 1.164383 * (1 << 16); const int csU_blue_16 = 2.017232 * (1 << 16); const int csU_green_16 = (-0.391762) * (1 << 16); const int csV_green_16 = (-0.812968) * (1 << 16); const int csV_red_16 = 1.596027 * (1 << 16); //查表 int Ym_tableEx[256]; int Um_blue_tableEx[256]; int Um_green_tableEx[256]; int Vm_green_tableEx[256]; int Vm_red_tableEx[256]; //采用查找表進行計算時，必須運行的初始化函數 void YUV422P_To_RGB24_init() { int i; for (i = 0; i < 256; ++i) { Ym_tableEx[i]=(csY_coeff_16 * (i - 16) )>>16; Um_blue_tableEx[i]=(csU_blue_16 * (i - 128) )>>16; Um_green_tableEx[i]=(csU_green_16 * (i - 128) )>>16; Vm_green_tableEx[i]=(csV_green_16 * (i - 128) )>>16; Vm_red_tableEx[i]=(csV_red_16 * (i - 128) )>>16; } } int YUV420P_To_RGB24(BYTE* pY, BYTE* pU, BYTE* pV, BYTE* DstPic, int width, int height) { int y; BYTE* pDstLine = DstPic; BYTE* yuv[3]; if ((width % 8)!=0) return(-1); yuv[0] = pY; yuv[1] = pU; yuv[2] = pV; for (y = height; y > 0; --y) { YUVToRGB24_Assemble(pDstLine, yuv, width); //decoder a line with asm function in YUVToRGB24_Assemble.s pDstLine += width * 3; //RGB888 yuv[0] += width; //YUV422 if(y % 2 == 1) { yuv[1] += width >> 1; yuv[2] += width >> 1; } } return 0; }? .text?? .macro??loadu?a?? ????adr?r1,?UM_BLUE?? ????ldr?r1,?[r1]?? ????ldr?r9,?[r1,?/a,?lsl?#2]?? ????adr?r1,?UM_GREEN?? ????ldr?r1,?[r1]?? ????ldr?r10,?[r1,?/a,?lsl?#2]?? .endm?? ?????? .macro??loadv?a?? ????adr?r1,?VM_RED?? ????ldr?r1,?[r1]?? ????ldr?r11,?[r1,?/a,?lsl?#2]?? ????adr?r1,?VM_GREEN?? ????ldr?r1,?[r1]?? ????ldr?r12,?[r1,?/a,?lsl?#2]????? .endm?? .macro??bound_r0?? ????cmp?r0,?#0x00?? ????movlt?r0,?#0x00?? ????cmp?r0,?#255?? ????movgt?r0,?#255?? .endm?? .globl?YUVToRGB24_Assemble?? @?r0?=?pDstLine;?r1?=?yuv;?r2?=?width?? YUVToRGB24_Assemble:?? ????stmdb?sp!,?{?r4,?r5,?r6,?r7,?r8,?r9,?r10,?r11,?r12,?lr}?? ?????? ????ldmia?r1,?{r1,?r3,?r4}??????@r1?=?y;?r3?=?u;?r4?=?v;?? ?????? ????mov?r5,?#0??????????@r5?=?row?counter?? hloop:?? ????ldr?r6,?[r1],?#0x04?????@load?y;?4?bytes?? ????ldrh?r7,?[r3],?#0x02????????@load?u;?2?bytes?? ????ldrh?r8,?[r4],?#0x02????????@load?v;?2?bytes?? ?????? ????stmdb?sp!,?{r0,?r1,?r2,?r3,?r4,?r5}?? ?????? ????@???temp?register:?r0,r1???rgbdata:?r2,r3,r4???? ????@???ye:r5??ue_blue:r9??ue_green:r10??ve_red:r11???ve_green:r12?? ?????? ????mov?r2,?#0?? ????mov?r3,?#0?? ????mov?r4,?#0?? ?????? ????@?load?ue_bule0,?ue_green0?? ????mov?r0,?r7?? ????and?r0,?r0,?#0xFF?? ????loadu?r0?? ?????? ????@load?ve_red0,?ve_green0?? ????mov?r0,?r8?? ????and?r0,?r0,?#0xFF?? ????loadv?r0?? ?????? ????@load?ye0?? ????mov?r0,?r6?? ????and?r0,?r0,?#0xFF?? ????adr?r1,?YM?? ????ldr?r1,?[r1]?? ????ldr?r5,?[r1,?r0,?lsl?#2]?? ?????? ????@r0?=?ye0+ve_red0?? ????add?r0,?r5,?r11?? ????bound_r0?? ?????? ????orr?r2,?r2,?r0?? ?????? ????@g0?=?ye0+ue_green0+ve_green0?? ????adds?r0,?r10,?r12?? ????adc?r0,?r0,?r5?? ????bound_r0?? ?????? ????orr?r2,?r2,?r0,?lsl?#8?? ?????? ????@b0?=?ye0+ue_blue0?? ????add?r0,?r5,?r9?? ????bound_r0?? ?????? ????orr?r2,?r2,?r0,?lsl?#16?? ?????? ????@load?ye1?? ????mov?r0,?r6,?lsr?#8?? ????and?r0,?r0,?#0xFF?? ????ldr?r5,?[r1,?r0,?lsl?#2]?? ?????? ????@r1?=?ye1+ve_red0?? ????add?r0,?r5,?r11?? ????bound_r0?? ?????? ????orr?r2,?r2,?r0,?lsl?#24?? ?????? ????@g1?=?ye1+ue_green0+ve_green0?? ????adds?r0,?r10,?r12?? ????adc?r0,?r0,?r5?? ????bound_r0?? ?????? ????orr?r3,?r3,?r0?? ?????? ????@b1?=?ye1+ue_blue0?? ????add?r0,?r5,?r9?? ????bound_r0?? ?????? ????orr?r3,?r3,?r0,?lsl?#8?? ?????? ????@?load?ue_bule1,?ue_green1?? ????mov?r0,?r7,?lsr?#8?? ????and?r0,?r0,?#0xFF?? ????loadu?r0?? ?????? ????@load?ve_red1,?ve_green1?? ????mov?r0,?r8,?lsr?#8?? ????and?r0,?r0,?#0xFF?? ????loadv?r0?? ?????? ????@load?ye2?? ????mov?r0,?r6,?lsr?#16?? ????and?r0,?r0,?#0xFF?? ????adr?r1,?YM?? ????ldr?r1,?[r1]?? ????ldr?r5,?[r1,?r0,?lsl?#2]?? ?????? ????@r2?=?ye2+ve_red1?? ????add?r0,?r5,?r11?? ????bound_r0?? ?????? ????orr?r3,?r3,?r0,?lsl?#16?? ?????? ????@g2?=?ye2+ue_green1+ve_green1?? ????adds?r0,?r10,?r12?? ????adc?r0,?r0,?r5?? ????bound_r0?? ?????? ????add?r3,?r3,?r0,?lsl?#24?? ?????? ????@b2?=?ye2+ue_blue1?? ????add?r0,?r5,?r9?? ????bound_r0?? ?????? ????orr?r4,?r4,?r0?? ?????? ????@load?ye3?? ????mov?r0,?r6,?lsr?#24?? ????and?r0,?r0,?#0xFF?? ????ldr?r5,?[r1,?r0,?lsl?#2]?? ?????? ????@r3?=?ye3+ve_red1?? ????add?r0,?r5,?r11?? ????bound_r0?? ?????? ????orr?r4,?r4,?r0,?lsl?#8?? ?????? ????@g3?=?ye3+ue_green1+ve_green1?? ????adds?r0,?r10,?r12?? ????adc?r0,?r0,?r5?? ????bound_r0?? ?????? ????orr?r4,?r4,?r0,?lsl?#16?? ?????? ????@b3?=?ye3+ue_blue1?? ????add?r0,?r5,?r9?? ????bound_r0?? ?????? ????orr?r4,?r4,?r0,?lsl?#24?? ?????? ????mov?r10,?r2?? ????mov?r11,?r3?? ????mov?r12,?r4??? ?????? ????ldmia?sp!,?{r0,?r1,?r2,?r3,?r4,?r5}?? ?????? ????stmia?r0!,?{r10,?r11,?r12}?? ?????????? ????add?r5,?r5,?#4?? ????cmp?r5,?r2?? ????blo?hloop?? ????ldmia?sp!,?{r4,?r5,?r6,?r7,?r8,?r9,?r10,?r11,?r12,?pc}??????@exit?? ?????? @tables?? YM??:?.long?Ym_tableEx?? UM_BLUE?:?.long?Um_blue_tableEx?? UM_GREEN:?.long?Um_green_tableEx?? VM_GREEN:?.long?Vm_green_tableEx?? VM_RED??:?.long?Vm_red_tableEx?? .text .macro loadu a adr r1, UM_BLUE ldr r1, [r1] ldr r9, [r1, /a, lsl #2] adr r1, UM_GREEN ldr r1, [r1] ldr r10, [r1, /a, lsl #2] .endm .macro loadv a adr r1, VM_RED ldr r1, [r1] ldr r11, [r1, /a, lsl #2] adr r1, VM_GREEN ldr r1, [r1] ldr r12, [r1, /a, lsl #2] .endm .macro bound_r0 cmp r0, #0x00 movlt r0, #0x00 cmp r0, #255 movgt r0, #255 .endm .globl YUVToRGB24_Assemble @ r0 = pDstLine; r1 = yuv; r2 = width YUVToRGB24_Assemble: stmdb sp!, { r4, r5, r6, r7, r8, r9, r10, r11, r12, lr} ldmia r1, {r1, r3, r4} @r1 = y; r3 = u; r4 = v; mov r5, #0 @r5 = row counter hloop: ldr r6, [r1], #0x04 @load y; 4 bytes ldrh r7, [r3], #0x02 @load u; 2 bytes ldrh r8, [r4], #0x02 @load v; 2 bytes stmdb sp!, {r0, r1, r2, r3, r4, r5} @ temp register: r0,r1 rgbdata: r2,r3,r4 @ ye:r5 ue_blue:r9 ue_green:r10 ve_red:r11 ve_green:r12 mov r2, #0 mov r3, #0 mov r4, #0 @ load ue_bule0, ue_green0 mov r0, r7 and r0, r0, #0xFF loadu r0 @load ve_red0, ve_green0 mov r0, r8 and r0, r0, #0xFF loadv r0 @load ye0 mov r0, r6 and r0, r0, #0xFF adr r1, YM ldr r1, [r1] ldr r5, [r1, r0, lsl #2] @r0 = ye0+ve_red0 add r0, r5, r11 bound_r0 orr r2, r2, r0 @g0 = ye0+ue_green0+ve_green0 adds r0, r10, r12 adc r0, r0, r5 bound_r0 orr r2, r2, r0, lsl #8 @b0 = ye0+ue_blue0 add r0, r5, r9 bound_r0 orr r2, r2, r0, lsl #16 @load ye1 mov r0, r6, lsr #8 and r0, r0, #0xFF ldr r5, [r1, r0, lsl #2] @r1 = ye1+ve_red0 add r0, r5, r11 bound_r0 orr r2, r2, r0, lsl #24 @g1 = ye1+ue_green0+ve_green0 adds r0, r10, r12 adc r0, r0, r5 bound_r0 orr r3, r3, r0 @b1 = ye1+ue_blue0 add r0, r5, r9 bound_r0 orr r3, r3, r0, lsl #8 @ load ue_bule1, ue_green1 mov r0, r7, lsr #8 and r0, r0, #0xFF loadu r0 @load ve_red1, ve_green1 mov r0, r8, lsr #8 and r0, r0, #0xFF loadv r0 @load ye2 mov r0, r6, lsr #16 and r0, r0, #0xFF adr r1, YM ldr r1, [r1] ldr r5, [r1, r0, lsl #2] @r2 = ye2+ve_red1 add r0, r5, r11 bound_r0 orr r3, r3, r0, lsl #16 @g2 = ye2+ue_green1+ve_green1 adds r0, r10, r12 adc r0, r0, r5 bound_r0 add r3, r3, r0, lsl #24 @b2 = ye2+ue_blue1 add r0, r5, r9 bound_r0 orr r4, r4, r0 @load ye3 mov r0, r6, lsr #24 and r0, r0, #0xFF ldr r5, [r1, r0, lsl #2] @r3 = ye3+ve_red1 add r0, r5, r11 bound_r0 orr r4, r4, r0, lsl #8 @g3 = ye3+ue_green1+ve_green1 adds r0, r10, r12 adc r0, r0, r5 bound_r0 orr r4, r4, r0, lsl #16 @b3 = ye3+ue_blue1 add r0, r5, r9 bound_r0 orr r4, r4, r0, lsl #24 mov r10, r2 mov r11, r3 mov r12, r4 ldmia sp!, {r0, r1, r2, r3, r4, r5} stmia r0!, {r10, r11, r12} add r5, r5, #4 cmp r5, r2 blo hloop ldmia sp!, {r4, r5, r6, r7, r8, r9, r10, r11, r12, pc} @exit @tables YM : .long Ym_tableEx UM_BLUE : .long Um_blue_tableEx UM_GREEN: .long Um_green_tableEx VM_GREEN: .long Vm_green_tableEx VM_RED : .long Vm_red_tableEx ?
?? ? ?YUV422p To RGB888 C語言版本接口說明：
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?? ? ?實現：
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?? ? ?經測試發現，在hi3512（arm 926ej-s,267MHz）平臺上運行時，該yuv轉rgb模塊的速度不是很快，大概20幀/秒。為了提高效率，核心解碼模塊我采用了arm匯編，重寫了YUVToRGB24_Table模塊。
YUV420P_To_RGB24_asm.c代碼：
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arm匯編核心解碼模塊：
[cpp] view plaincopyprint??
將核心模塊改成匯編后，解碼達到了50幀/秒，效率提高了60%，匯編果然強大，哈哈。
總結
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