mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-24 18:51:11 +00:00
Tutorial 3
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parent
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commit
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10 changed files with 559 additions and 0 deletions
17
gst-sdk/tutorials/android-tutorial-3/AndroidManifest.xml
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17
gst-sdk/tutorials/android-tutorial-3/AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.gst_sdk_tutorials.tutorial_3"
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android:versionCode="1"
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android:versionName="1.0">
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<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="14"/>
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<application android:label="@string/app_name"
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android:icon="@drawable/gst_sdk_icon">
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<activity android:name=".Tutorial3"
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android:label="@string/app_name">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>
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20
gst-sdk/tutorials/android-tutorial-3/jni/Android.mk
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20
gst-sdk/tutorials/android-tutorial-3/jni/Android.mk
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LOCAL_PATH := $(call my-dir)
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include $(CLEAR_VARS)
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LOCAL_MODULE := tutorial-3
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LOCAL_SRC_FILES := tutorial-3.c
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LOCAL_SHARED_LIBRARIES := gstreamer_android
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LOCAL_LDLIBS := -llog -landroid
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include $(BUILD_SHARED_LIBRARY)
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ifndef GSTREAMER_SDK_ROOT
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ifndef GSTREAMER_SDK_ROOT_ANDROID
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$(error GSTREAMER_SDK_ROOT_ANDROID is not defined!)
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endif
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GSTREAMER_SDK_ROOT := $(GSTREAMER_SDK_ROOT_ANDROID)
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endif
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GSTREAMER_NDK_BUILD_PATH := $(GSTREAMER_SDK_ROOT)/share/gst-android/ndk-build/
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include $(GSTREAMER_NDK_BUILD_PATH)/plugins.mk
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GSTREAMER_PLUGINS := $(GSTREAMER_PLUGINS_CORE) $(GSTREAMER_PLUGINS_SYS)
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include $(GSTREAMER_NDK_BUILD_PATH)/gstreamer.mk
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329
gst-sdk/tutorials/android-tutorial-3/jni/tutorial-3.c
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329
gst-sdk/tutorials/android-tutorial-3/jni/tutorial-3.c
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#include <string.h>
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#include <jni.h>
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#include <android/log.h>
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#include <android/native_window.h>
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#include <android/native_window_jni.h>
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#include <gst/gst.h>
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#include <gst/interfaces/xoverlay.h>
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#include <pthread.h>
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GST_DEBUG_CATEGORY_STATIC (debug_category);
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#define GST_CAT_DEFAULT debug_category
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/*
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* These macros provide a way to store the native pointer to CustomData, which might be 32 or 64 bits, into
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* a jlong, which is always 64 bits, without warnings.
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*/
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#if GLIB_SIZEOF_VOID_P == 8
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# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(*env)->GetLongField (env, thiz, fieldID)
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# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)data)
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#else
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# define GET_CUSTOM_DATA(env, thiz, fieldID) (CustomData *)(jint)(*env)->GetLongField (env, thiz, fieldID)
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# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
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#endif
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/* Structure to contain all our information, so we can pass it to callbacks */
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typedef struct _CustomData {
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jobject app; /* Application instance, used to call its methods. A global reference is kept. */
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GstElement *pipeline; /* The running pipeline */
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GstElement *video_sink;/* The video sink element which receives XOverlay commands */
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GMainContext *context; /* GLib context used to run the main loop */
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GMainLoop *main_loop; /* GLib main loop */
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gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
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ANativeWindow *native_window;
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} CustomData;
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/* These global variables cache values which are not changing during execution */
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static pthread_t gst_app_thread;
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static pthread_key_t current_jni_env;
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static JavaVM *java_vm;
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static jfieldID custom_data_field_id;
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static jmethodID set_message_method_id;
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static jmethodID on_gstreamer_initialized_method_id;
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/*
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* Private methods
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*/
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/* Register this thread with the VM */
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static JNIEnv *attach_current_thread (void) {
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JNIEnv *env;
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JavaVMAttachArgs args;
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GST_DEBUG ("Attaching thread %p", g_thread_self ());
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args.version = JNI_VERSION_1_4;
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args.name = NULL;
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args.group = NULL;
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if ((*java_vm)->AttachCurrentThread (java_vm, &env, &args) < 0) {
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GST_ERROR ("Failed to attach current thread");
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return NULL;
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}
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return env;
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}
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/* Unregister this thread from the VM */
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static void detach_current_thread (void *env) {
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GST_DEBUG ("Detaching thread %p", g_thread_self ());
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(*java_vm)->DetachCurrentThread (java_vm);
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}
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/* Retrieve the JNI environment for this thread */
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static JNIEnv *get_jni_env (void) {
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JNIEnv *env;
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if ((env = pthread_getspecific (current_jni_env)) == NULL) {
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env = attach_current_thread ();
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pthread_setspecific (current_jni_env, env);
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}
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return env;
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}
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/* Change the content of the UI's TextView */
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static void set_ui_message (const gchar *message, CustomData *data) {
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JNIEnv *env = get_jni_env ();
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GST_DEBUG ("Setting message to: %s", message);
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jstring jmessage = (*env)->NewStringUTF(env, message);
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(*env)->CallVoidMethod (env, data->app, set_message_method_id, jmessage);
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if ((*env)->ExceptionCheck (env)) {
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GST_ERROR ("Failed to call Java method");
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(*env)->ExceptionClear (env);
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}
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(*env)->DeleteLocalRef (env, jmessage);
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}
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/* Retrieve errors from the bus and show them on the UI */
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static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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GError *err;
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gchar *debug_info;
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gchar *message_string;
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gst_message_parse_error (msg, &err, &debug_info);
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message_string = g_strdup_printf ("Error received from element %s: %s", GST_OBJECT_NAME (msg->src), err->message);
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g_clear_error (&err);
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g_free (debug_info);
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set_ui_message (message_string, data);
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g_free (message_string);
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gst_element_set_state (data->pipeline, GST_STATE_NULL);
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}
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/* Notify UI about pipeline state changes */
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static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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GstState old_state, new_state, pending_state;
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gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
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/* Only pay attention to messages coming from the pipeline, not its children */
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if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
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gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
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set_ui_message(message, data);
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g_free (message);
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}
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}
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/* Check if all conditions are met to report GStreamer as initialized.
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* These conditions will change depending on the application */
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static void check_initialization_complete (CustomData *data) {
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JNIEnv *env = get_jni_env ();
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if (!data->initialized && data->native_window && data->main_loop) {
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GST_DEBUG ("Initialization complete, notifying application. native_window:%p main_loop:%p", data->native_window, data->main_loop);
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(*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
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if ((*env)->ExceptionCheck (env)) {
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GST_ERROR ("Failed to call Java method");
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(*env)->ExceptionClear (env);
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}
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data->initialized = TRUE;
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}
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}
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/* Main method for the native code. This is executed on its own thread. */
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static void *app_function (void *userdata) {
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JavaVMAttachArgs args;
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GstBus *bus;
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CustomData *data = (CustomData *)userdata;
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GSource *bus_source;
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GError *error = NULL;
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GST_DEBUG ("Creating pipeline in CustomData at %p", data);
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/* Create our own GLib Main Context and make it the default one */
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data->context = g_main_context_new ();
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g_main_context_push_thread_default(data->context);
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/* Build pipeline */
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data->pipeline = gst_parse_launch("videotestsrc ! ffmpegcolorspace ! autovideosink", &error);
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if (error) {
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gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
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g_clear_error (&error);
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set_ui_message(message, data);
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g_free (message);
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return NULL;
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}
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gst_element_set_state(data->pipeline, GST_STATE_READY);
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data->video_sink = gst_bin_get_by_interface(GST_BIN(data->pipeline), GST_TYPE_X_OVERLAY);
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if (!data->video_sink) {
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GST_ERROR ("Could not retrieve video sink");
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}
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if (data->native_window) {
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GST_DEBUG ("Native window already received, notifying the pipeline about it.");
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gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->video_sink), (guintptr)data->native_window);
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}
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/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
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bus = gst_element_get_bus (data->pipeline);
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bus_source = gst_bus_create_watch (bus);
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g_source_set_callback (bus_source, (GSourceFunc) gst_bus_async_signal_func, NULL, NULL);
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g_source_attach (bus_source, data->context);
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g_source_unref (bus_source);
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g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, data);
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g_signal_connect (G_OBJECT (bus), "message::state-changed", (GCallback)state_changed_cb, data);
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gst_object_unref (bus);
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/* Create a GLib Main Loop and set it to run */
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GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
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data->main_loop = g_main_loop_new (data->context, FALSE);
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check_initialization_complete (data);
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g_main_loop_run (data->main_loop);
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GST_DEBUG ("Exited main loop");
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g_main_loop_unref (data->main_loop);
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data->main_loop = NULL;
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/* Free resources */
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g_main_context_pop_thread_default(data->context);
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g_main_context_unref (data->context);
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gst_element_set_state (data->pipeline, GST_STATE_NULL);
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gst_object_unref (data->pipeline);
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return NULL;
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}
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/*
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* Java Bindings
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*/
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/* Instruct the native code to create its internal data structure, pipeline and thread */
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static void gst_native_init (JNIEnv* env, jobject thiz) {
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CustomData *data = g_new0 (CustomData, 1);
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SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
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GST_DEBUG_CATEGORY_INIT (debug_category, "tutorial-3", 0, "Android tutorial 3");
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gst_debug_set_threshold_for_name("tutorial-3", GST_LEVEL_DEBUG);
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GST_DEBUG ("Created CustomData at %p", data);
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data->app = (*env)->NewGlobalRef (env, thiz);
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GST_DEBUG ("Created GlobalRef for app object at %p", data->app);
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pthread_create (&gst_app_thread, NULL, &app_function, data);
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}
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/* Quit the main loop, remove the native thread and free resources */
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static void gst_native_finalize (JNIEnv* env, jobject thiz) {
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CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
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if (!data) return;
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GST_DEBUG ("Quitting main loop...");
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g_main_loop_quit (data->main_loop);
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GST_DEBUG ("Waiting for thread to finish...");
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pthread_join (gst_app_thread, NULL);
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GST_DEBUG ("Deleting GlobalRef for app object at %p", data->app);
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(*env)->DeleteGlobalRef (env, data->app);
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GST_DEBUG ("Freeing CustomData at %p", data);
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g_free (data);
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SET_CUSTOM_DATA (env, thiz, custom_data_field_id, NULL);
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GST_DEBUG ("Done finalizing");
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}
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/* Set pipeline to PLAYING state */
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static void gst_native_play (JNIEnv* env, jobject thiz) {
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CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
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if (!data) return;
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GST_DEBUG ("Setting state to PLAYING");
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gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
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}
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/* Set pipeline to PAUSED state */
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static void gst_native_pause (JNIEnv* env, jobject thiz) {
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CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
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if (!data) return;
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GST_DEBUG ("Setting state to PAUSED");
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gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
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}
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/* Static class initializer: retrieve method and field IDs */
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static jboolean gst_native_class_init (JNIEnv* env, jclass klass) {
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custom_data_field_id = (*env)->GetFieldID (env, klass, "native_custom_data", "J");
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set_message_method_id = (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
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on_gstreamer_initialized_method_id = (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
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if (!custom_data_field_id || !set_message_method_id || !on_gstreamer_initialized_method_id) {
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/* We emit this message through the Android log instead of the GStreamer log because the later
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* has not been initialized yet.
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*/
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// __android_log_print (ANDROID_LOG_ERROR, "tutorial-2", "The calling class does not implement all necessary interface methods");
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return JNI_FALSE;
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}
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return JNI_TRUE;
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}
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static void gst_native_surface_init (JNIEnv *env, jobject thiz, jobject surface) {
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CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
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if (!data) return;
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GST_DEBUG ("Received surface %p", surface);
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if (data->native_window) {
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GST_DEBUG ("Releasing previous native window %p", data->native_window);
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ANativeWindow_release (data->native_window);
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}
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data->native_window = ANativeWindow_fromSurface(env, surface);
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GST_DEBUG ("Got Native Window %p", data->native_window);
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if (data->video_sink) {
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GST_DEBUG ("Pipeline already created, notifying it about the native window.");
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gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->video_sink), (guintptr)data->native_window);
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} else {
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GST_DEBUG ("Pipeline not created yet, it will later be notified about the native window.");
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}
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check_initialization_complete (data);
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}
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static void gst_native_surface_finalize (JNIEnv *env, jobject thiz) {
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CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
|
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if (!data) return;
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GST_DEBUG ("Releasing Native Window %p", data->native_window);
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|
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if (data->video_sink) {
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gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->video_sink), (guintptr)NULL);
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gst_element_set_state (data->pipeline, GST_STATE_NULL);
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}
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|
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ANativeWindow_release (data->native_window);
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data->native_window = NULL;
|
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}
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|
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/* List of implemented native methods */
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static JNINativeMethod native_methods[] = {
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{ "nativeInit", "()V", (void *) gst_native_init},
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{ "nativeFinalize", "()V", (void *) gst_native_finalize},
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{ "nativePlay", "()V", (void *) gst_native_play},
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{ "nativePause", "()V", (void *) gst_native_pause},
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{ "nativeSurfaceInit", "(Ljava/lang/Object;)V", (void *) gst_native_surface_init},
|
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{ "nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
|
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{ "nativeClassInit", "()Z", (void *) gst_native_class_init}
|
||||
};
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|
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/* Library initializer */
|
||||
jint JNI_OnLoad(JavaVM *vm, void *reserved) {
|
||||
JNIEnv *env = NULL;
|
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|
||||
java_vm = vm;
|
||||
|
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if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) {
|
||||
// __android_log_print (ANDROID_LOG_ERROR, "tutorial-3", "Could not retrieve JNIEnv");
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return 0;
|
||||
}
|
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jclass klass = (*env)->FindClass (env, "com/gst_sdk_tutorials/tutorial_3/Tutorial3");
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(*env)->RegisterNatives (env, klass, native_methods, G_N_ELEMENTS(native_methods));
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pthread_key_create (¤t_jni_env, detach_current_thread);
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return JNI_VERSION_1_4;
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}
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40
gst-sdk/tutorials/android-tutorial-3/res/layout/main.xml
Normal file
40
gst-sdk/tutorials/android-tutorial-3/res/layout/main.xml
Normal file
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<?xml version="1.0" encoding="utf-8"?>
|
||||
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="match_parent"
|
||||
android:orientation="vertical" >
|
||||
|
||||
<TextView
|
||||
android:id="@+id/textview_message"
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="wrap_content" />
|
||||
|
||||
<LinearLayout
|
||||
android:layout_width="match_parent"
|
||||
android:layout_height="wrap_content"
|
||||
android:orientation="horizontal" >
|
||||
|
||||
<ImageButton
|
||||
android:id="@+id/button_play"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
android:contentDescription="@string/button_play"
|
||||
android:src="@android:drawable/ic_media_play"
|
||||
android:text="@string/button_play" />
|
||||
|
||||
<ImageButton
|
||||
android:id="@+id/button_stop"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content"
|
||||
android:contentDescription="@string/button_stop"
|
||||
android:src="@android:drawable/ic_media_pause"
|
||||
android:text="@string/button_stop" />
|
||||
|
||||
</LinearLayout>
|
||||
|
||||
<SurfaceView
|
||||
android:id="@+id/surface_video"
|
||||
android:layout_width="wrap_content"
|
||||
android:layout_height="wrap_content" />
|
||||
|
||||
</LinearLayout>
|
|
@ -0,0 +1,6 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<resources>
|
||||
<string name="app_name">Android tutorial 3</string>
|
||||
<string name="button_play">Play</string>
|
||||
<string name="button_stop">Stop</string>
|
||||
</resources>
|
|
@ -0,0 +1,147 @@
|
|||
package com.gst_sdk_tutorials.tutorial_3;
|
||||
|
||||
import android.app.Activity;
|
||||
import android.os.Bundle;
|
||||
import android.util.Log;
|
||||
import android.view.SurfaceHolder;
|
||||
import android.view.SurfaceView;
|
||||
import android.view.View;
|
||||
import android.view.View.OnClickListener;
|
||||
import android.widget.ImageButton;
|
||||
import android.widget.TextView;
|
||||
import android.widget.Toast;
|
||||
|
||||
import com.gst_sdk.GStreamer;
|
||||
|
||||
public class Tutorial3 extends Activity implements SurfaceHolder.Callback {
|
||||
private native void nativeInit(); // Initialize native code, build pipeline, etc
|
||||
private native void nativeFinalize(); // Destroy pipeline and shutdown native code
|
||||
private native void nativePlay(); // Set pipeline to PLAYING
|
||||
private native void nativePause(); // Set pipeline to PAUSED
|
||||
private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
|
||||
private native void nativeSurfaceInit(Object surface);
|
||||
private native void nativeSurfaceFinalize();
|
||||
private long native_custom_data; // Native code will use this to keep private data
|
||||
|
||||
private boolean is_playing_desired; // Whether the user asked to go to PLAYING
|
||||
|
||||
private Bundle initialization_data; // onCreate parameters kept for later
|
||||
|
||||
// Called when the activity is first created.
|
||||
@Override
|
||||
public void onCreate(Bundle savedInstanceState)
|
||||
{
|
||||
super.onCreate(savedInstanceState);
|
||||
|
||||
// Initialize GStreamer and warn if it fails
|
||||
try {
|
||||
GStreamer.init(this);
|
||||
} catch (Exception e) {
|
||||
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
|
||||
finish();
|
||||
return;
|
||||
}
|
||||
|
||||
setContentView(R.layout.main);
|
||||
|
||||
ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
|
||||
play.setOnClickListener(new OnClickListener() {
|
||||
public void onClick(View v) {
|
||||
is_playing_desired = true;
|
||||
nativePlay();
|
||||
}
|
||||
});
|
||||
|
||||
ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
|
||||
pause.setOnClickListener(new OnClickListener() {
|
||||
public void onClick(View v) {
|
||||
is_playing_desired = false;
|
||||
nativePause();
|
||||
}
|
||||
});
|
||||
|
||||
SurfaceView sv = (SurfaceView) this.findViewById(R.id.surface_video);
|
||||
SurfaceHolder sh = sv.getHolder();
|
||||
sh.addCallback(this);
|
||||
|
||||
// Keep the instance state for later, since we will not perform our initialization
|
||||
// until the native code reports that it is itself initialized.
|
||||
initialization_data = savedInstanceState;
|
||||
|
||||
// Start with disabled buttons, until native code is initialized
|
||||
this.findViewById(R.id.button_play).setEnabled(false);
|
||||
this.findViewById(R.id.button_stop).setEnabled(false);
|
||||
is_playing_desired = false;
|
||||
|
||||
nativeInit();
|
||||
}
|
||||
|
||||
protected void onSaveInstanceState (Bundle outState) {
|
||||
Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired);
|
||||
outState.putBoolean("playing", is_playing_desired);
|
||||
}
|
||||
|
||||
protected void onDestroy() {
|
||||
nativeFinalize();
|
||||
super.onDestroy();
|
||||
}
|
||||
|
||||
// Called from native code. This sets the content of the TextView from the UI thread.
|
||||
private void setMessage(final String message) {
|
||||
final TextView tv = (TextView) this.findViewById(R.id.textview_message);
|
||||
runOnUiThread (new Runnable() {
|
||||
public void run() {
|
||||
tv.setText(message);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
// Called from native code. Native code calls this once it has created its pipeline and
|
||||
// the main loop is running, so it is ready to accept commands.
|
||||
private void onGStreamerInitialized () {
|
||||
// If initialization data is present, retrieve it
|
||||
if (initialization_data != null) {
|
||||
is_playing_desired = initialization_data.getBoolean("playing");
|
||||
Log.i ("GStreamer", "Restoring state, playing:" + is_playing_desired);
|
||||
}
|
||||
|
||||
// Restore previous playing state
|
||||
if (is_playing_desired) {
|
||||
nativePlay();
|
||||
} else {
|
||||
nativePause();
|
||||
}
|
||||
|
||||
// Re-enable buttons, now that GStreamer is initialized
|
||||
final Activity activity = this;
|
||||
runOnUiThread(new Runnable() {
|
||||
public void run() {
|
||||
activity.findViewById(R.id.button_play).setEnabled(true);
|
||||
activity.findViewById(R.id.button_stop).setEnabled(true);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
static {
|
||||
System.loadLibrary("gstreamer_android");
|
||||
System.loadLibrary("tutorial-3");
|
||||
nativeClassInit();
|
||||
}
|
||||
|
||||
public void surfaceChanged(SurfaceHolder holder, int format, int width,
|
||||
int height) {
|
||||
Log.d("GStreamer", "Surface changed to format " + format + " width "
|
||||
+ width + " height " + height);
|
||||
nativeSurfaceInit (holder.getSurface());
|
||||
}
|
||||
|
||||
public void surfaceCreated(SurfaceHolder holder) {
|
||||
Log.d("GStreamer", "Surface created: " + holder.getSurface());
|
||||
}
|
||||
|
||||
public void surfaceDestroyed(SurfaceHolder holder) {
|
||||
Log.d("GStreamer", "Surface destroyed");
|
||||
nativeSurfaceFinalize ();
|
||||
}
|
||||
|
||||
}
|
Loading…
Reference in a new issue