本文详细介绍了如何解决在Galaxy S设备上使用FFmpeg时遇到的音频库libjniaudio和视频库libjnivideo相关的问题。包括通过调整代码以兼容不同Android版本的音频跟踪和视频表面类的变化。
Hi,
I tried to run the ffpmeg app on Galaxy S with v. 2.3.3. Issue#1was withlibjniaudio- due to change of signature of android::AudioTrack::set().
Follows my patch for audiotrack.cpp, functionAndroidAudioTrack_set():
status_t ret = NAME_NOT_FOUND;
void *lptr_media = dlopen("libmedia.so", 0);
__android_log_print(ANDROID_LOG_DEBUG, TAG, "dlopen returns %p", lptr_media);
if (lptr_media) // first, try gingerbread
{
status_t (*fptr_set)(AudioTrack* track,
int streamType,
uint32_t sampleRate,
int format,
int channels,
int frameCount,
uint32_t flags,
AudioTrack::callback_t cbf,
void* user,
int notificationFrames,
const sp<IMemory>& sharedBuffer,
bool threadCanCallJava,
int sessionId);
fptr_set = (typeof fptr_set)dlsym(lptr_media, "_ZN7android10AudioTrack3setEijiiijPFviPvS1_ES1_iRKNS_2spINS_7IMemoryEEEbi");
__android_log_print(ANDROID_LOG_DEBUG, TAG, "dlsym returns %p", fptr_set);
if (fptr_set != 0)
{
ret = fptr_set(track,
streamType,
sampleRate,
format,
channels,
0, 0, 0, 0, 0, 0, 0, 0);
__android_log_print(ANDROID_LOG_DEBUG, TAG, "fptr_set() returns %d", ret);
dlclose(lptr_media);
lptr_media = 0;
}
}
if (lptr_media) // second, try froyo
{
status_t (*fptr_set)(AudioTrack* track,
int streamType,
uint32_t sampleRate,
int format,
int channels,
int frameCount,
uint32_t flags,
AudioTrack::callback_t cbf,
void* user,
int notificationFrames,
const sp<IMemory>& sharedBuffer,
bool threadCanCallJava);
fptr_set = (typeof fptr_set)dlsym(lptr_media, "_ZN7android10AudioTrack3setEijiiijPFviPvS1_ES1_iRKNS_2spINS_7IMemoryEEEb");
__android_log_print(ANDROID_LOG_INFO, TAG, "dlsym returns %p", fptr_set);
if (fptr_set != 0)
{
ret = fptr_set(track,
streamType,
sampleRate,
format,
channels,
0, 0, 0, 0, 0, 0, 0); // push max number of parameters
__android_log_print(ANDROID_LOG_INFO, TAG, "fptr_set() returns %d", ret);
dlclose(lptr_media);
lptr_media = 0;
}
}
if (lptr_media) // finally, close library anyway
{
dlclose(lptr_media);
}
hi, you should change the mSurface to mNativeSurface with under above 2.3.
BTW, how to compile with neon or vfp?
yes I know, better way will be add ifdef for OS version, neon or vfp support zou must set in config.h of ffmpeg, but I think that better way is compile ffmpeg with theirs makefiles and than use this libffmpeg.so like prebuilt library in android's project
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ffmpeg: libjnivideo on gingerbread
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Hi,
I tried to run the ffpmeg app on Galaxy S with v. 2.3.3. Issue#2was withlibjnivideo- due to change of name of the native surface field inandroid/view/Surfaceclass.
Follows my patch forsurface.cpp, functiongetNativeSurface():
static Surface* getNativeSurface(JNIEnv* env, jobject jsurface) {
jclass clazz = env->FindClass("android/view/Surface");
jfieldID field_surface = env->GetFieldID(clazz, "mSurface", "I");
if(field_surface == NULL) {
#ifdef ANDROID_VIEW_SURFACE_JNI_ID // using gingerbread version of <surfaceflinger/Surface.h>
env->ExceptionClear();
field_surface = env->GetFieldID(clazz, ANDROID_VIEW_SURFACE_JNI_ID, "I");
#endif
}
if(field_surface == NULL) {
return NULL;
}
return (Surface *) env->GetIntField(jsurface, field_surface);
}