int attribute_align_arg sws_scale(struct SwsContext *c, const uint8_t * const srcSlice[], const int srcStride[], int srcSliceY, int srcSliceH, uint8_t *const dst[], const int dstStride[]) { int i, ret; const uint8_t *src2[4] = { srcSlice[0], srcSlice[1], srcSlice[2], srcSlice[3] }; uint8_t *dst2[4] = { dst[0], dst[1], dst[2], dst[3] }; uint8_t *rgb0_tmp = NULL; // do not mess up sliceDir if we have a "trailing" 0-size slice if (srcSliceH == 0) return 0; if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) { av_log(c, AV_LOG_ERROR, "bad src image pointers\n"); return 0; } if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) { av_log(c, AV_LOG_ERROR, "bad dst image pointers\n"); return 0; } if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) { av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n"); return 0; } if (c->sliceDir == 0) { if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1; } if (usePal(c->srcFormat)) { for (i = 0; i < 256; i++) { int p, r, g, b, y, u, v, a = 0xff; if (c->srcFormat == AV_PIX_FMT_PAL8) { p = ((const uint32_t *)(srcSlice[1]))[i]; a = (p >> 24) & 0xFF; r = (p >> 16) & 0xFF; g = (p >> 8) & 0xFF; b = p & 0xFF; } else if (c->srcFormat == AV_PIX_FMT_RGB8) { r = ( i >> 5 ) * 36; g = ((i >> 2) & 7) * 36; b = ( i & 3) * 85; } else if (c->srcFormat == AV_PIX_FMT_BGR8) { b = ( i >> 6 ) * 85; g = ((i >> 3) & 7) * 36; r = ( i & 7) * 36; } else if (c->srcFormat == AV_PIX_FMT_RGB4_BYTE) { r = ( i >> 3 ) * 255; g = ((i >> 1) & 3) * 85; b = ( i & 1) * 255; } else if (c->srcFormat == AV_PIX_FMT_GRAY8 || c->srcFormat == AV_PIX_FMT_GRAY8A) { r = g = b = i; } else { av_assert1(c->srcFormat == AV_PIX_FMT_BGR4_BYTE); b = ( i >> 3 ) * 255; g = ((i >> 1) & 3) * 85; r = ( i & 1) * 255; } #define RGB2YUV_SHIFT 15 #define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) #define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5)) y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT); u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT); v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT); c->pal_yuv[i]= y + (u<<8) + (v<<16) + ((unsigned)a<<24); switch (c->dstFormat) { case AV_PIX_FMT_BGR32: #if !HAVE_BIGENDIAN case AV_PIX_FMT_RGB24: #endif c->pal_rgb[i]= r + (g<<8) + (b<<16) + ((unsigned)a<<24); break; case AV_PIX_FMT_BGR32_1: #if HAVE_BIGENDIAN case AV_PIX_FMT_BGR24: #endif c->pal_rgb[i]= a + (r<<8) + (g<<16) + ((unsigned)b<<24); break; case AV_PIX_FMT_RGB32_1: #if HAVE_BIGENDIAN case AV_PIX_FMT_RGB24: #endif c->pal_rgb[i]= a + (b<<8) + (g<<16) + ((unsigned)r<<24); break; case AV_PIX_FMT_RGB32: #if !HAVE_BIGENDIAN case AV_PIX_FMT_BGR24: #endif default: c->pal_rgb[i]= b + (g<<8) + (r<<16) + ((unsigned)a<<24); } } } if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) { uint8_t *base; int x,y; rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32); base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp; for (y=0; y<srcSliceH; y++){ memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW); for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) { base[ srcStride[0]*y + x] = 0xFF; } } src2[0] = base; } // copy strides, so they can safely be modified if (c->sliceDir == 1) { // slices go from top to bottom int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2], srcStride[3] }; int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2], dstStride[3] }; reset_ptr(src2, c->srcFormat); reset_ptr((void*)dst2, c->dstFormat); /* reset slice direction at end of frame */ if (srcSliceY + srcSliceH == c->srcH) c->sliceDir = 0; ret = c->swScale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2, dstStride2); } else { // slices go from bottom to top => we flip the image internally int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2], -srcStride[3] }; int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2], -dstStride[3] }; src2[0] += (srcSliceH - 1) * srcStride[0]; if (!usePal(c->srcFormat)) src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1]; src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2]; src2[3] += (srcSliceH - 1) * srcStride[3]; dst2[0] += ( c->dstH - 1) * dstStride[0]; dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1]; dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2]; dst2[3] += ( c->dstH - 1) * dstStride[3]; reset_ptr(src2, c->srcFormat); reset_ptr((void*)dst2, c->dstFormat); /* reset slice direction at end of frame */ if (!srcSliceY) c->sliceDir = 0; ret = c->swScale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH, srcSliceH, dst2, dstStride2); } av_free(rgb0_tmp); return ret; }