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
|
/*
* Copyright (C) 2011 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_NDEBUG 1
#define LOG_TAG "PreviewRenderer"
#include <utils/Log.h>
#include "PreviewRenderer.h"
#include <media/stagefright/foundation/ADebug.h>
#include <gui/Surface.h>
namespace android {
PreviewRenderer* PreviewRenderer::CreatePreviewRenderer (
const sp<Surface> &surface, size_t width, size_t height) {
PreviewRenderer* renderer = new PreviewRenderer(surface, width, height);
if (renderer->init() != 0) {
delete renderer;
return NULL;
}
return renderer;
}
PreviewRenderer::PreviewRenderer(
const sp<Surface> &surface,
size_t width, size_t height)
: mSurface(surface),
mWidth(width),
mHeight(height) {
}
int PreviewRenderer::init() {
int err = 0;
ANativeWindow* anw = mSurface.get();
err = native_window_api_connect(anw, NATIVE_WINDOW_API_CPU);
if (err) goto fail;
err = native_window_set_usage(
anw, GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN);
if (err) goto fail;
err = native_window_set_buffer_count(anw, 3);
if (err) goto fail;
err = native_window_set_scaling_mode(
anw, NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
if (err) goto fail;
err = native_window_set_buffers_geometry(
anw, mWidth, mHeight, HAL_PIXEL_FORMAT_YV12);
if (err) goto fail;
err = native_window_set_buffers_transform(anw, 0);
if (err) goto fail;
fail:
return err;
}
PreviewRenderer::~PreviewRenderer() {
native_window_api_disconnect(mSurface.get(), NATIVE_WINDOW_API_CPU);
}
//
// Provides a buffer and associated stride
// This buffer is allocated by the SurfaceFlinger
//
// For optimal display performances, you should :
// 1) call getBufferYV12()
// 2) fill the buffer with your data
// 3) call renderYV12() to take these changes into account
//
// For each call to getBufferYV12(), you must also call renderYV12()
// Expected format in the buffer is YV12 formats (similar to YUV420 planar fromat)
// for more details on this YV12 cf hardware/libhardware/include/hardware/hardware.h
//
void PreviewRenderer::getBufferYV12(uint8_t **data, size_t *stride) {
int err = OK;
if ((err = mSurface->ANativeWindow::dequeueBuffer(mSurface.get(), &mBuf)) != 0) {
ALOGW("Surface::dequeueBuffer returned error %d", err);
return;
}
CHECK_EQ(0, mSurface->ANativeWindow::lockBuffer(mSurface.get(), mBuf));
GraphicBufferMapper &mapper = GraphicBufferMapper::get();
Rect bounds(mWidth, mHeight);
void *dst;
CHECK_EQ(0, mapper.lock(mBuf->handle,
GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN,
bounds, &dst));
*data = (uint8_t*)dst;
*stride = mBuf->stride;
}
//
// Display the content of the buffer provided by last call to getBufferYV12()
//
// See getBufferYV12() for details.
//
void PreviewRenderer::renderYV12() {
int err = OK;
GraphicBufferMapper &mapper = GraphicBufferMapper::get();
if (mBuf!= NULL) {
CHECK_EQ(0, mapper.unlock(mBuf->handle));
if ((err = mSurface->ANativeWindow::queueBuffer(mSurface.get(), mBuf)) != 0) {
ALOGW("Surface::queueBuffer returned error %d", err);
}
}
mBuf = NULL;
}
} // namespace android
|
