移植FFmpeg到Android ics

想到把FFmpeg移植到Android上面

網上有現成的2.2的移植，可以下載下來，鏈接https://github.com/havlenapetr，裡面的ffmpeg和framework下面的libaudio和libviedo兩個so，就是全部的東西。

看過一些東西，都說不開放某些代碼，挺沒勁的，人家都已經放出全部代碼了，有什麼藏匿的。

app下面的代碼幾乎不需要修改，就是一些編譯的錯誤，就是framework下面的本地適配需要需要改一下，適應一下ics，就是surface.cpp這個文件。

2. /*
4. * Copyright (C) 2009 The Android Open Source Project
5. *
6. * Licensed under the Apache License, Version 2.0 (the "License");
7. * you may not use this file except in compliance with the License.
8. * You may obtain a copy of the License at
9. *
10. * http://www.apache.org/licenses/LICENSE-2.0
11. *
12. * Unless required by applicable law or agreed to in writing, software
13. * distributed under the License is distributed on an "AS IS" BASIS,
14. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15. * See the License for the specific language governing permissions and
16. * limitations under the License.
17. */
18. #include <android/surface.h>
19. #include <surfaceflinger/Surface.h>
20. #include <utils/Log.h>
21. #include <SkBitmap.h>
22. #include <SkCanvas.h>
24. #define TAG "SurfaceWrapper"
26. using namespace android;
28. static Surface *sSurface;
29. static SkBitmap sBitmapClient;
30. static SkBitmap sBitmapSurface;
32. static Surface *getNativeSurface (JNIEnv * env, jobject jsurface)
33. {
34. jclass clazz = env->FindClass ("android/view/Surface");
35. jfieldID field_surface = env->GetFieldID (clazz, "mNativeSurface", "I");
36. if (field_surface == NULL)
37. {
38. return NULL;
39. }
40. return (Surface *) env->GetIntField (jsurface, field_surface);
41. }
43. static int initBitmap (SkBitmap * bitmap, int format, int width, int height, bool allocPixels)
44. {
45. switch (format)
46. {
47. case PIXEL_FORMAT_RGBA_8888:
48. bitmap->setConfig (SkBitmap::kARGB_8888_Config, width, height);
49. break;
51. case PIXEL_FORMAT_RGBA_4444:
52. bitmap->setConfig (SkBitmap::kARGB_4444_Config, width, height);
53. break;
55. case PIXEL_FORMAT_RGB_565:
56. bitmap->setConfig (SkBitmap::kRGB_565_Config, width, height);
57. break;
59. case PIXEL_FORMAT_A_8:
60. bitmap->setConfig (SkBitmap::kA8_Config, width, height);
61. break;
63. default:
64. bitmap->setConfig (SkBitmap::kNo_Config, width, height);
65. break;
66. }
68. if (allocPixels)
69. {
70. bitmap->setIsOpaque (true);
71. //-- alloc array of pixels
72. if (!bitmap->allocPixels ())
73. {
74. return -1;
75. }
76. }
77. return 0;
78. }
80. int AndroidSurface_register (JNIEnv * env, jobject jsurface)
81. {
82. __android_log_print (ANDROID_LOG_INFO, TAG, "registering video surface");
84. sSurface = getNativeSurface (env, jsurface);
85. if (sSurface == NULL)
86. {
87. return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;
88. }
90. __android_log_print (ANDROID_LOG_INFO, TAG, "registered");
92. return ANDROID_SURFACE_RESULT_SUCCESS;
93. }
95. int AndroidSurface_getPixels (int width, int height, void **pixels)
96. {
97. __android_log_print (ANDROID_LOG_INFO, TAG, "getting surface's pixels %ix%i", width, height);
98. if (sSurface == NULL)
99. {
100. return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;
101. }
102. if (initBitmap (&sBitmapClient, PIXEL_FORMAT_RGB_565, width, height, true) < 0)
103. {
104. return ANDROID_SURFACE_RESULT_COULDNT_INIT_BITMAP_CLIENT;
105. }
106. *pixels = sBitmapClient.getPixels ();
107. __android_log_print (ANDROID_LOG_INFO, TAG, "getted");
108. return ANDROID_SURFACE_RESULT_SUCCESS;
109. }
111. static void doUpdateSurface ()
112. {
113. SkCanvas canvas (sBitmapSurface);
114. SkRect surface_sBitmapClient;
115. SkRect surface_sBitmapSurface;
116. SkMatrix matrix;
118. surface_sBitmapSurface.set (0, 0, sBitmapSurface.width (), sBitmapSurface.height ());
119. surface_sBitmapClient.set (0, 0, sBitmapClient.width (), sBitmapClient.height ());
120. matrix.setRectToRect (surface_sBitmapClient, surface_sBitmapSurface, SkMatrix::kFill_ScaleToFit);
122. canvas.drawBitmapMatrix (sBitmapClient, matrix);
123. }
125. static int prepareSurfaceBitmap (Surface::SurfaceInfo * info)
126. {
127. if (initBitmap (&sBitmapSurface, info->format, info->w, info->h, false) < 0)
128. {
129. return -1;
130. }
131. sBitmapSurface.setPixels (info->bits);
132. return 0;
133. }
135. int AndroidSurface_updateSurface ()
136. {
137. static Surface::SurfaceInfo surfaceInfo;
138. if (sSurface == NULL)
139. {
140. return ANDROID_SURFACE_RESULT_JNI_EXCEPTION;
141. }
143. if (!Surface::isValid (sSurface))
144. {
145. return ANDROID_SURFACE_RESULT_NOT_VALID;
146. }
147. if (sSurface->lock (&surfaceInfo,NULL) < 0)
148. {
149. return ANDROID_SURFACE_RESULT_COULDNT_LOCK;
150. }
152. if (prepareSurfaceBitmap (&surfaceInfo) < 0)
153. {
154. return ANDROID_SURFACE_RESULT_COULDNT_INIT_BITMAP_SURFACE;
155. }
157. doUpdateSurface ();
159. if (sSurface->unlockAndPost () < 0)
160. {
161. return ANDROID_SURFACE_RESULT_COULDNT_UNLOCK_AND_POST;
162. }
163. return ANDROID_SURFACE_RESULT_SUCCESS;
164. }
166. int AndroidSurface_unregister ()
167. {
168. __android_log_print (ANDROID_LOG_INFO, TAG, "unregistering video surface");
169. __android_log_print (ANDROID_LOG_INFO, TAG, "unregistered");
170. return ANDROID_SURFACE_RESULT_SUCCESS;
171. }

改完以後，編譯出來的apk就是可以播放的，但是效果相當的差，問題太多了，需要時間來分析一下。

更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11