方法1:注册Plugin
device/qcom/common/media/media_codecs.xml
...
status_t OMXCodec::configureCodec(const sp &meta) {
...
} else if (meta->findData(kKeyAVCC, &type, &data, &size)) {
// Parse the AVCDecoderConfigurationRecord
unsigned profile, level;
status_t err;
if ((err = parseAVCCodecSpecificData(
data, size, &profile, &level)) != OK) {
ALOGE("Malformed AVC codec specific data.");
return err;
}
QCOMXCodec::checkIfInterlaced((const uint8_t *)data, meta);
OMXMaster.cpp
OMXMaster::OMXMaster()
: mVendorLibHandle(NULL) {
addVendorPlugin();
addPlugin(new SoftOMXPlugin);
}
void OMXMaster::addVendorPlugin() {
addPlugin("libstagefrighthw.so");
}
void OMXMaster::addPlugin(const char *libname) {
mVendorLibHandle = dlopen(libname, RTLD_NOW);
if (mVendorLibHandle == NULL) {
return;
}
typedef OMXPluginBase *(*CreateOMXPluginFunc)();
CreateOMXPluginFunc createOMXPlugin =
(CreateOMXPluginFunc)dlsym(
mVendorLibHandle, "createOMXPlugin");
if (!createOMXPlugin)
createOMXPlugin = (CreateOMXPluginFunc)dlsym(
mVendorLibHandle, "_ZN7android15createOMXPluginEv");
if (createOMXPlugin) {
addPlugin((*createOMXPlugin)());
}
}
void OMXMaster::addPlugin(OMXPluginBase *plugin) {
Mutex::Autolock autoLock(mLock);
mPlugins.push_back(plugin);
OMX_U32 index = 0;
char name[128];
OMX_ERRORTYPE err;
while ((err = plugin->enumerateComponents(
name, sizeof(name), index++)) == OMX_ErrorNone) {
String8 name8(name);
if (mPluginByComponentName.indexOfKey(name8) >= 0) {
ALOGE("A component of name '%s' already exists, ignoring this one.",
name8.string());
continue;
}
mPluginByComponentName.add(name8, plugin);
}
if (err != OMX_ErrorNoMore) {
ALOGE("OMX plugin failed w/ error 0x%08x after registering %d "
"components", err, mPluginByComponentName.size());
}
}
OMX_ERRORTYPE OMXMaster::makeComponentInstance(
const char *name,
const OMX_CALLBACKTYPE *callbacks,
OMX_PTR appData,
OMX_COMPONENTTYPE **component) {
Mutex::Autolock autoLock(mLock);
*component = NULL;
ssize_t index = mPluginByComponentName.indexOfKey(String8(name));
if (index < 0) {
return OMX_ErrorInvalidComponentName;
}
OMXPluginBase *plugin = mPluginByComponentName.valueAt(index);
OMX_ERRORTYPE err =
plugin->makeComponentInstance(name, callbacks, appData, component);
if (err != OMX_ErrorNone) {
return err;
}
mPluginByInstance.add(*component, plugin);
return err;
}
在SoftOMXPlugin.cpp中,增加一行
static const struct {
const char *mName;
const char *mLibNameSuffix;
const char *mRole;
} kComponents[] = {
{ "OMX.google.aac.decoder", "aacdec", "audio_decoder.aac" },
{ "OMX.my.aac", "aac_my", "audio/mp4a-latm" },
方法2:
实现OMXPluginBase接口及函数OMXPluginBase *(*CreateOMXPluginFunc)(),并在media_codecs.xml中加入对应描述。
struct OMXPluginBase {
OMXPluginBase() {}
virtual ~OMXPluginBase() {}
virtual OMX_ERRORTYPE makeComponentInstance(
const char *name,
const OMX_CALLBACKTYPE *callbacks,
OMX_PTR appData,
OMX_COMPONENTTYPE **component) = 0;
virtual OMX_ERRORTYPE destroyComponentInstance(
OMX_COMPONENTTYPE *component) = 0;
virtual OMX_ERRORTYPE enumerateComponents(
OMX_STRING name,
size_t size,
OMX_U32 index) = 0;
virtual OMX_ERRORTYPE getRolesOfComponent(
const char *name,
Vector *roles) = 0;
private:
OMXPluginBase(const OMXPluginBase &);
OMXPluginBase &operator=(const OMXPluginBase &);
};
方法3:
实现一整套NuPlayer机制+OMX Codec