1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
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
|
