1 files changed, 173 insertions, 0 deletions
diff --git a/media/libstagefright/SoftwareRenderer.cpp b/media/libstagefright/SoftwareRenderer.cpp
new file mode 100644
index 0000000..66b6b07
--- /dev/null
+++ b/media/libstagefright/SoftwareRenderer.cpp
@@ -0,0 +1,173 @@
+/*
+ * 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.
+ */
+
+#define LOG_TAG "SoftwareRenderer"
+#include <utils/Log.h>
+
+#undef NDEBUG
+#include <assert.h>
+
+#include <binder/MemoryHeapBase.h>
+#include <media/stagefright/SoftwareRenderer.h>
+#include <ui/ISurface.h>
+
+namespace android {
+
+#define QCOM_YUV        0
+
+SoftwareRenderer::SoftwareRenderer(
+        const sp<ISurface> &surface,
+        size_t displayWidth, size_t displayHeight,
+        size_t decodedWidth, size_t decodedHeight)
+    : mISurface(surface),
+      mDisplayWidth(displayWidth),
+      mDisplayHeight(displayHeight),
+      mDecodedWidth(decodedWidth),
+      mDecodedHeight(decodedHeight),
+      mFrameSize(mDecodedWidth * mDecodedHeight * 2),  // RGB565
+      mMemoryHeap(new MemoryHeapBase(2 * mFrameSize)),
+      mIndex(0) {
+    assert(mISurface.get() != NULL);
+    assert(mDecodedWidth > 0);
+    assert(mDecodedHeight > 0);
+    assert(mMemoryHeap->heapID() >= 0);
+
+    ISurface::BufferHeap bufferHeap(
+            mDisplayWidth, mDisplayHeight,
+            mDecodedWidth, mDecodedHeight,
+            PIXEL_FORMAT_RGB_565,
+            mMemoryHeap);
+
+    status_t err = mISurface->registerBuffers(bufferHeap);
+    assert(err == OK);
+}
+
+SoftwareRenderer::~SoftwareRenderer() {
+    mISurface->unregisterBuffers();
+}
+
+void SoftwareRenderer::render(
+        const void *data, size_t size, void *platformPrivate) {
+    assert(size >= (mDecodedWidth * mDecodedHeight * 3) / 2);
+
+    static const signed kClipMin = -278;
+    static const signed kClipMax = 535;
+    static uint8_t kClip[kClipMax - kClipMin + 1];
+    static uint8_t *kAdjustedClip = &kClip[-kClipMin];
+
+    static bool clipInitialized = false;
+
+    if (!clipInitialized) {
+        for (signed i = kClipMin; i <= kClipMax; ++i) {
+            kClip[i - kClipMin] = (i < 0) ? 0 : (i > 255) ? 255 : (uint8_t)i;
+        }
+        clipInitialized = true;
+    }
+
+    size_t offset = mIndex * mFrameSize;
+
+    void *dst = (uint8_t *)mMemoryHeap->getBase() + offset;
+
+    uint32_t *dst_ptr = (uint32_t *)dst;
+
+    const uint8_t *src_y = (const uint8_t *)data;
+
+    const uint8_t *src_u =
+        (const uint8_t *)src_y + mDecodedWidth * mDecodedHeight;
+
+#if !QCOM_YUV
+    const uint8_t *src_v =
+        (const uint8_t *)src_u + (mDecodedWidth / 2) * (mDecodedHeight / 2);
+#endif
+
+    for (size_t y = 0; y < mDecodedHeight; ++y) {
+        for (size_t x = 0; x < mDecodedWidth; 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;
+
+#if QCOM_YUV
+            signed u = (signed)src_u[x & ~1] - 128;
+            signed v = (signed)src_u[(x & ~1) + 1] - 128;
+#else
+            signed u = (signed)src_u[x / 2] - 128;
+            signed v = (signed)src_v[x / 2] - 128;
+#endif
+
+            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 += mDecodedWidth;
+
+        if (y & 1) {
+#if QCOM_YUV
+            src_u += mDecodedWidth;
+#else
+            src_u += mDecodedWidth / 2;
+            src_v += mDecodedWidth / 2;
+#endif
+        }
+
+        dst_ptr += mDecodedWidth / 2;
+    }
+
+    mISurface->postBuffer(offset);
+    mIndex = 1 - mIndex;
+}
+
+}  // namespace android