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Diffstat (limited to 'media/libstagefright/omx/ColorConverter.cpp')
| -rw-r--r-- | media/libstagefright/omx/ColorConverter.cpp | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/media/libstagefright/omx/ColorConverter.cpp b/media/libstagefright/omx/ColorConverter.cpp new file mode 100644 index 0000000..e74782f --- /dev/null +++ b/media/libstagefright/omx/ColorConverter.cpp @@ -0,0 +1,297 @@ +/* + * Copyright (C) 2009 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <media/stagefright/ColorConverter.h> +#include <media/stagefright/MediaDebug.h> + +namespace android { + +static const int OMX_QCOM_COLOR_FormatYVU420SemiPlanar = 0x7FA30C00; + +ColorConverter::ColorConverter( + OMX_COLOR_FORMATTYPE from, OMX_COLOR_FORMATTYPE to) + : mSrcFormat(from), + mDstFormat(to), + mClip(NULL) { +} + +ColorConverter::~ColorConverter() { + delete[] mClip; + mClip = NULL; +} + +bool ColorConverter::isValid() const { + if (mDstFormat != OMX_COLOR_Format16bitRGB565) { + return false; + } + + switch (mSrcFormat) { + case OMX_COLOR_FormatYUV420Planar: + case OMX_COLOR_FormatCbYCrY: + case OMX_QCOM_COLOR_FormatYVU420SemiPlanar: + return true; + + default: + return false; + } +} + +void ColorConverter::convert( + size_t width, size_t height, + const void *srcBits, size_t srcSkip, + void *dstBits, size_t dstSkip) { + CHECK_EQ(mDstFormat, OMX_COLOR_Format16bitRGB565); + + switch (mSrcFormat) { + case OMX_COLOR_FormatYUV420Planar: + convertYUV420Planar( + width, height, srcBits, srcSkip, dstBits, dstSkip); + break; + + case OMX_COLOR_FormatCbYCrY: + convertCbYCrY( + width, height, srcBits, srcSkip, dstBits, dstSkip); + break; + + case OMX_QCOM_COLOR_FormatYVU420SemiPlanar: + convertQCOMYUV420SemiPlanar( + width, height, srcBits, srcSkip, dstBits, dstSkip); + break; + + default: + { + CHECK(!"Should not be here. Unknown color conversion."); + break; + } + } +} + +void ColorConverter::convertCbYCrY( + size_t width, size_t height, + const void *srcBits, size_t srcSkip, + void *dstBits, size_t dstSkip) { + CHECK_EQ(srcSkip, 0); // Doesn't really make sense for YUV formats. + CHECK(dstSkip >= width * 2); + CHECK((dstSkip & 3) == 0); + + uint8_t *kAdjustedClip = initClip(); + + uint32_t *dst_ptr = (uint32_t *)dstBits; + + const uint8_t *src = (const uint8_t *)srcBits; + + for (size_t y = 0; y < height; ++y) { + for (size_t x = 0; x < width; x += 2) { + signed y1 = (signed)src[2 * x + 1] - 16; + signed y2 = (signed)src[2 * x + 3] - 16; + signed u = (signed)src[2 * x] - 128; + signed v = (signed)src[2 * x + 2] - 128; + + signed u_b = u * 517; + signed u_g = -u * 100; + signed v_g = -v * 208; + signed v_r = v * 409; + + signed tmp1 = y1 * 298; + signed b1 = (tmp1 + u_b) / 256; + signed g1 = (tmp1 + v_g + u_g) / 256; + signed r1 = (tmp1 + v_r) / 256; + + signed tmp2 = y2 * 298; + signed b2 = (tmp2 + u_b) / 256; + signed g2 = (tmp2 + v_g + u_g) / 256; + signed r2 = (tmp2 + v_r) / 256; + + uint32_t rgb1 = + ((kAdjustedClip[r1] >> 3) << 11) + | ((kAdjustedClip[g1] >> 2) << 5) + | (kAdjustedClip[b1] >> 3); + + uint32_t rgb2 = + ((kAdjustedClip[r2] >> 3) << 11) + | ((kAdjustedClip[g2] >> 2) << 5) + | (kAdjustedClip[b2] >> 3); + + dst_ptr[x / 2] = (rgb2 << 16) | rgb1; + } + + src += width * 2; + dst_ptr += dstSkip / 4; + } +} + +void ColorConverter::convertYUV420Planar( + size_t width, size_t height, + const void *srcBits, size_t srcSkip, + void *dstBits, size_t dstSkip) { + CHECK_EQ(srcSkip, 0); // Doesn't really make sense for YUV formats. + CHECK(dstSkip >= width * 2); + CHECK((dstSkip & 3) == 0); + + uint8_t *kAdjustedClip = initClip(); + + uint32_t *dst_ptr = (uint32_t *)dstBits; + const uint8_t *src_y = (const uint8_t *)srcBits; + + const uint8_t *src_u = + (const uint8_t *)src_y + width * height; + + const uint8_t *src_v = + (const uint8_t *)src_u + (width / 2) * (height / 2); + + for (size_t y = 0; y < height; ++y) { + for (size_t x = 0; x < width; x += 2) { + // B = 1.164 * (Y - 16) + 2.018 * (U - 128) + // G = 1.164 * (Y - 16) - 0.813 * (V - 128) - 0.391 * (U - 128) + // R = 1.164 * (Y - 16) + 1.596 * (V - 128) + + // B = 298/256 * (Y - 16) + 517/256 * (U - 128) + // G = .................. - 208/256 * (V - 128) - 100/256 * (U - 128) + // R = .................. + 409/256 * (V - 128) + + // min_B = (298 * (- 16) + 517 * (- 128)) / 256 = -277 + // min_G = (298 * (- 16) - 208 * (255 - 128) - 100 * (255 - 128)) / 256 = -172 + // min_R = (298 * (- 16) + 409 * (- 128)) / 256 = -223 + + // max_B = (298 * (255 - 16) + 517 * (255 - 128)) / 256 = 534 + // max_G = (298 * (255 - 16) - 208 * (- 128) - 100 * (- 128)) / 256 = 432 + // max_R = (298 * (255 - 16) + 409 * (255 - 128)) / 256 = 481 + + // clip range -278 .. 535 + + signed y1 = (signed)src_y[x] - 16; + signed y2 = (signed)src_y[x + 1] - 16; + + signed u = (signed)src_u[x / 2] - 128; + signed v = (signed)src_v[x / 2] - 128; + + signed u_b = u * 517; + signed u_g = -u * 100; + signed v_g = -v * 208; + signed v_r = v * 409; + + signed tmp1 = y1 * 298; + signed b1 = (tmp1 + u_b) / 256; + signed g1 = (tmp1 + v_g + u_g) / 256; + signed r1 = (tmp1 + v_r) / 256; + + signed tmp2 = y2 * 298; + signed b2 = (tmp2 + u_b) / 256; + signed g2 = (tmp2 + v_g + u_g) / 256; + signed r2 = (tmp2 + v_r) / 256; + + uint32_t rgb1 = + ((kAdjustedClip[r1] >> 3) << 11) + | ((kAdjustedClip[g1] >> 2) << 5) + | (kAdjustedClip[b1] >> 3); + + uint32_t rgb2 = + ((kAdjustedClip[r2] >> 3) << 11) + | ((kAdjustedClip[g2] >> 2) << 5) + | (kAdjustedClip[b2] >> 3); + + dst_ptr[x / 2] = (rgb2 << 16) | rgb1; + } + + src_y += width; + + if (y & 1) { + src_u += width / 2; + src_v += width / 2; + } + + dst_ptr += dstSkip / 4; + } +} + +void ColorConverter::convertQCOMYUV420SemiPlanar( + size_t width, size_t height, + const void *srcBits, size_t srcSkip, + void *dstBits, size_t dstSkip) { + CHECK_EQ(srcSkip, 0); // Doesn't really make sense for YUV formats. + CHECK(dstSkip >= width * 2); + CHECK((dstSkip & 3) == 0); + + uint8_t *kAdjustedClip = initClip(); + + uint32_t *dst_ptr = (uint32_t *)dstBits; + const uint8_t *src_y = (const uint8_t *)srcBits; + + const uint8_t *src_u = + (const uint8_t *)src_y + width * height; + + for (size_t y = 0; y < height; ++y) { + for (size_t x = 0; x < width; x += 2) { + signed y1 = (signed)src_y[x] - 16; + signed y2 = (signed)src_y[x + 1] - 16; + + signed u = (signed)src_u[x & ~1] - 128; + signed v = (signed)src_u[(x & ~1) + 1] - 128; + + signed u_b = u * 517; + signed u_g = -u * 100; + signed v_g = -v * 208; + signed v_r = v * 409; + + signed tmp1 = y1 * 298; + signed b1 = (tmp1 + u_b) / 256; + signed g1 = (tmp1 + v_g + u_g) / 256; + signed r1 = (tmp1 + v_r) / 256; + + signed tmp2 = y2 * 298; + signed b2 = (tmp2 + u_b) / 256; + signed g2 = (tmp2 + v_g + u_g) / 256; + signed r2 = (tmp2 + v_r) / 256; + + uint32_t rgb1 = + ((kAdjustedClip[b1] >> 3) << 11) + | ((kAdjustedClip[g1] >> 2) << 5) + | (kAdjustedClip[r1] >> 3); + + uint32_t rgb2 = + ((kAdjustedClip[b2] >> 3) << 11) + | ((kAdjustedClip[g2] >> 2) << 5) + | (kAdjustedClip[r2] >> 3); + + dst_ptr[x / 2] = (rgb2 << 16) | rgb1; + } + + src_y += width; + + if (y & 1) { + src_u += width; + } + + dst_ptr += dstSkip / 4; + } +} + +uint8_t *ColorConverter::initClip() { + static const signed kClipMin = -278; + static const signed kClipMax = 535; + + if (mClip == NULL) { + mClip = new uint8_t[kClipMax - kClipMin + 1]; + + for (signed i = kClipMin; i <= kClipMax; ++i) { + mClip[i - kClipMin] = (i < 0) ? 0 : (i > 255) ? 255 : (uint8_t)i; + } + } + + return &mClip[-kClipMin]; +} + +} // namespace android |