#include <android/native_window.h>
#include <android/native_window_jni.h>
#include <gst/gst.h>
-#include <pthread.h>
#include <gst/interfaces/xoverlay.h>
+#include <gst/video/video.h>
+#include <pthread.h>
GST_DEBUG_CATEGORY_STATIC (debug_category);
#define GST_CAT_DEFAULT debug_category
# define SET_CUSTOM_DATA(env, thiz, fieldID, data) (*env)->SetLongField (env, thiz, fieldID, (jlong)(jint)data)
#endif
+/* Do not allow seeks to be performed closer than this distance. It is visually useless, and will probably
+ * confuse some demuxers. */
+#define SEEK_MIN_DELAY (500 * GST_MSECOND)
+
+/* Structure to contain all our information, so we can pass it to callbacks */
typedef struct _CustomData {
- jobject app;
- GstElement *pipeline;
- GMainContext *context;
- GMainLoop *main_loop;
- ANativeWindow *native_window;
- GstState state, target_state;
- gint64 position;
- gint64 duration;
- gint64 desired_position;
- GstClockTime last_seek_time;
- gboolean initialized;
- gboolean is_live;
+ jobject app; /* Application instance, used to call its methods. A global reference is kept. */
+ GstElement *pipeline; /* The running pipeline */
+ GMainContext *context; /* GLib context used to run the main loop */
+ GMainLoop *main_loop; /* GLib main loop */
+ gboolean initialized; /* To avoid informing the UI multiple times about the initialization */
+ ANativeWindow *native_window; /* The Android native window where video will be rendered */
+ GstState state; /* Current pipeline state */
+ GstState target_state; /* Desired pipeline state, to be set once buffering is complete */
+ gint64 duration; /* Cached clip duration */
+ gint64 desired_position; /* Position to seek to, once the pipeline is running */
+ GstClockTime last_seek_time; /* For seeking overflow prevention (throttling) */
+ gboolean is_live; /* Live streams do not use buffering */
} CustomData;
+/* playbin2 flags */
+typedef enum {
+ GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
+} GstPlayFlags;
+
+/* These global variables cache values which are not changing during execution */
static pthread_t gst_app_thread;
static pthread_key_t current_jni_env;
static JavaVM *java_vm;
static jfieldID custom_data_field_id;
static jmethodID set_message_method_id;
static jmethodID set_current_position_method_id;
-static jmethodID set_current_state_method_id;
static jmethodID on_gstreamer_initialized_method_id;
+static jmethodID on_media_size_changed_method_id;
/*
* Private methods
*/
+
+/* Register this thread with the VM */
static JNIEnv *attach_current_thread (void) {
JNIEnv *env;
JavaVMAttachArgs args;
return env;
}
+/* Unregister this thread from the VM */
static void detach_current_thread (void *env) {
GST_DEBUG ("Detaching thread %p", g_thread_self ());
(*java_vm)->DetachCurrentThread (java_vm);
}
+/* Retrieve the JNI environment for this thread */
static JNIEnv *get_jni_env (void) {
JNIEnv *env;
return env;
}
+/* Change the content of the UI's TextView */
static void set_ui_message (const gchar *message, CustomData *data) {
JNIEnv *env = get_jni_env ();
GST_DEBUG ("Setting message to: %s", message);
(*env)->DeleteLocalRef (env, jmessage);
}
+/* Tell the application what is the current position and clip duration */
static void set_current_ui_position (gint position, gint duration, CustomData *data) {
JNIEnv *env = get_jni_env ();
-// GST_DEBUG ("Setting current position/duration to: %d / %d (ms)", position, duration);
(*env)->CallVoidMethod (env, data->app, set_current_position_method_id, position, duration);
if ((*env)->ExceptionCheck (env)) {
GST_ERROR ("Failed to call Java method");
}
}
+/* If we have pipeline and it is running, query the current position and clip duration and inform
+ * the application */
static gboolean refresh_ui (CustomData *data) {
GstFormat fmt = GST_FORMAT_TIME;
gint64 current = -1;
+ gint64 position;
/* We do not want to update anything unless we have a working pipeline in the PAUSED or PLAYING state */
if (!data || !data->pipeline || data->state < GST_STATE_PAUSED)
}
}
- if (gst_element_query_position (data->pipeline, &fmt, &data->position)) {
- /* Java expects these values in milliseconds, and Gst provides nanoseconds */
- set_current_ui_position (data->position / GST_MSECOND, data->duration / GST_MSECOND, data);
+ if (gst_element_query_position (data->pipeline, &fmt, &position)) {
+ /* Java expects these values in milliseconds, and GStreamer provides nanoseconds */
+ set_current_ui_position (position / GST_MSECOND, data->duration / GST_MSECOND, data);
}
return TRUE;
}
-static void execute_seek (gint64 desired_position, CustomData *data);
-static gboolean
-delayed_seek_cb (CustomData *data)
-{
- GST_DEBUG ("Doing delayed seek %" GST_TIME_FORMAT, GST_TIME_ARGS (data->desired_position));
- data->last_seek_time = GST_CLOCK_TIME_NONE;
- execute_seek (data->desired_position, data);
- return FALSE;
-}
+/* Forward declaration for the delayed seek callback */
+static gboolean delayed_seek_cb (CustomData *data);
+/* Perform seek, if we are not too close to the previous seek. Otherwise, schedule the seek for
+ * some time in the future. */
static void execute_seek (gint64 desired_position, CustomData *data) {
- gboolean res;
gint64 diff;
if (desired_position == GST_CLOCK_TIME_NONE)
diff = gst_util_get_timestamp () - data->last_seek_time;
- if (GST_CLOCK_TIME_IS_VALID (data->last_seek_time) && diff < 500 * GST_MSECOND) {
+ if (GST_CLOCK_TIME_IS_VALID (data->last_seek_time) && diff < SEEK_MIN_DELAY) {
+ /* The previous seek was too close, delay this one */
GSource *timeout_source;
-
- if (!GST_CLOCK_TIME_IS_VALID (data->desired_position)) {
- timeout_source = g_timeout_source_new (diff / GST_MSECOND);
+
+ if (data->desired_position == GST_CLOCK_TIME_NONE) {
+ /* There was no previous seek scheduled. Setup a timer for some time in the future */
+ timeout_source = g_timeout_source_new ((SEEK_MIN_DELAY - diff) / GST_MSECOND);
g_source_set_callback (timeout_source, (GSourceFunc)delayed_seek_cb, data, NULL);
g_source_attach (timeout_source, data->context);
g_source_unref (timeout_source);
}
+ /* Update the desired seek position. If multiple petitions are received before it is time
+ * to perform a seek, only the last one is remembered. */
data->desired_position = desired_position;
GST_DEBUG ("Throttling seek to %" GST_TIME_FORMAT ", will be in %" GST_TIME_FORMAT,
- GST_TIME_ARGS (desired_position), GST_TIME_ARGS (500 * GST_MSECOND - diff));
+ GST_TIME_ARGS (desired_position), GST_TIME_ARGS (SEEK_MIN_DELAY - diff));
} else {
- GST_DEBUG ("Setting position to %lld milliseconds", desired_position / GST_MSECOND);
- res = gst_element_seek_simple (data->pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, desired_position);
+ /* Perform the seek now */
+ GST_DEBUG ("Seeking to %" GST_TIME_FORMAT, GST_TIME_ARGS (desired_position));
data->last_seek_time = gst_util_get_timestamp ();
+ gst_element_seek_simple (data->pipeline, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT, desired_position);
data->desired_position = GST_CLOCK_TIME_NONE;
- GST_DEBUG ("Seek returned %d", res);
}
}
+/* Delayed seek callback. This gets called by the timer setup in the above function. */
+static gboolean delayed_seek_cb (CustomData *data) {
+ GST_DEBUG ("Doing delayed seek to %" GST_TIME_FORMAT, GST_TIME_ARGS (data->desired_position));
+ execute_seek (data->desired_position, data);
+ return FALSE;
+}
+
+/* Retrieve errors from the bus and show them on the UI */
static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
GError *err;
gchar *debug_info;
gst_element_set_state (data->pipeline, GST_STATE_NULL);
}
+/* Called when the End Of the Stream is reached. Just move to the beginning of the media and pause. */
static void eos_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
- set_ui_message (GST_MESSAGE_TYPE_NAME (msg), data);
- refresh_ui (data);
data->target_state = GST_STATE_PAUSED;
data->is_live = (gst_element_set_state (data->pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
execute_seek (0, data);
}
+/* Called when the duration of the media changes. Just mark it as unknown, so we re-query it in the next UI refresh. */
static void duration_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
data->duration = GST_CLOCK_TIME_NONE;
}
+/* Called when buffering messages are received. We inform the UI about the current buffering level and
+ * keep the pipeline paused until 100% buffering is reached. At that point, set the desired state. */
static void buffering_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
gint percent;
gst_message_parse_buffering (msg, &percent);
if (percent < 100 && data->target_state >= GST_STATE_PAUSED) {
- gchar * message_string = g_strdup_printf ("Buffering %d %%", percent);
+ gchar * message_string = g_strdup_printf ("Buffering %d%%", percent);
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
set_ui_message (message_string, data);
g_free (message_string);
} else if (data->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
- set_ui_message ("PLAYING", data);
} else if (data->target_state >= GST_STATE_PAUSED) {
- set_ui_message ("PAUSED", data);
+ set_ui_message ("Buffering complete", data);
}
}
+/* Called when the clock is lost */
static void clock_lost_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
if (data->target_state >= GST_STATE_PLAYING) {
gst_element_set_state (data->pipeline, GST_STATE_PAUSED);
}
}
-static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
+/* Retrieve the video sink's Caps and tell the application about the media size */
+static void check_media_size (CustomData *data) {
JNIEnv *env = get_jni_env ();
+ GstElement *video_sink;
+ GstPad *video_sink_pad;
+ GstCaps *caps;
+ GstVideoFormat fmt;
+ int width;
+ int height;
+
+ /* Retrieve the Caps at the entrance of the video sink */
+ g_object_get (data->pipeline, "video-sink", &video_sink, NULL);
+ video_sink_pad = gst_element_get_static_pad (video_sink, "sink");
+ caps = gst_pad_get_negotiated_caps (video_sink_pad);
+
+ if (gst_video_format_parse_caps(caps, &fmt, &width, &height)) {
+ int par_n, par_d;
+ if (gst_video_parse_caps_pixel_aspect_ratio (caps, &par_n, &par_d)) {
+ width = width * par_n / par_d;
+ }
+ GST_DEBUG ("Media size is %dx%d, notifying application", width, height);
+
+ (*env)->CallVoidMethod (env, data->app, on_media_size_changed_method_id, (jint)width, (jint)height);
+ if ((*env)->ExceptionCheck (env)) {
+ GST_ERROR ("Failed to call Java method");
+ (*env)->ExceptionClear (env);
+ }
+ }
+
+ gst_caps_unref(caps);
+ gst_object_unref (video_sink_pad);
+ gst_object_unref(video_sink);
+}
+
+/* Notify UI about pipeline state changes */
+static void state_changed_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
GstState old_state, new_state, pending_state;
gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
/* Only pay attention to messages coming from the pipeline, not its children */
if (GST_MESSAGE_SRC (msg) == GST_OBJECT (data->pipeline)) {
data->state = new_state;
- if (data->state >= GST_STATE_PAUSED && GST_CLOCK_TIME_IS_VALID (data->desired_position))
- execute_seek (data->desired_position, data);
- GST_DEBUG ("State changed to %s, notifying application", gst_element_state_get_name(new_state));
- (*env)->CallVoidMethod (env, data->app, set_current_state_method_id, new_state);
- if ((*env)->ExceptionCheck (env)) {
- GST_ERROR ("Failed to call Java method");
- (*env)->ExceptionClear (env);
+ gchar *message = g_strdup_printf("State changed to %s", gst_element_state_get_name(new_state));
+ set_ui_message(message, data);
+ g_free (message);
+
+ /* The Ready to Paused state change is particularly interesting: */
+ if (old_state == GST_STATE_READY && new_state == GST_STATE_PAUSED) {
+ /* By now the sink already knows the media size */
+ check_media_size(data);
+
+ /* If there was a scheduled seek, perform it now that we have moved to the Paused state */
+ if (GST_CLOCK_TIME_IS_VALID (data->desired_position))
+ execute_seek (data->desired_position, data);
}
}
}
+/* Check if all conditions are met to report GStreamer as initialized.
+ * These conditions will change depending on the application */
static void check_initialization_complete (CustomData *data) {
JNIEnv *env = get_jni_env ();
- /* Check if all conditions are met to report GStreamer as initialized.
- * These conditions will change depending on the application */
if (!data->initialized && data->native_window && data->main_loop) {
- GST_DEBUG ("Initialization complete, notifying application. native_window:%p main_loop:%p", data->native_window,data->main_loop);
+ GST_DEBUG ("Initialization complete, notifying application. native_window:%p main_loop:%p", data->native_window, data->main_loop);
+
+ /* The main loop is running and we received a native window, inform the sink about it */
+ gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->pipeline), (guintptr)data->native_window);
+
(*env)->CallVoidMethod (env, data->app, on_gstreamer_initialized_method_id);
if ((*env)->ExceptionCheck (env)) {
GST_ERROR ("Failed to call Java method");
}
}
+/* Main method for the native code. This is executed on its own thread. */
static void *app_function (void *userdata) {
JavaVMAttachArgs args;
GstBus *bus;
- GstMessage *msg;
CustomData *data = (CustomData *)userdata;
GSource *timeout_source;
GSource *bus_source;
+ GError *error = NULL;
guint flags;
GST_DEBUG ("Creating pipeline in CustomData at %p", data);
- /* create our own GLib Main Context, so we do not interfere with other libraries using GLib */
+ /* Create our own GLib Main Context and make it the default one */
data->context = g_main_context_new ();
+ g_main_context_push_thread_default(data->context);
+
+ /* Build pipeline */
+ data->pipeline = gst_parse_launch("playbin2", &error);
+ if (error) {
+ gchar *message = g_strdup_printf("Unable to build pipeline: %s", error->message);
+ g_clear_error (&error);
+ set_ui_message(message, data);
+ g_free (message);
+ return NULL;
+ }
- data->pipeline = gst_element_factory_make ("playbin2", NULL);
+ /* Disable subtitles */
g_object_get (data->pipeline, "flags", &flags, NULL);
- /* Disable subtitles for now */
- flags &= ~0x00000004;
+ flags &= ~GST_PLAY_FLAG_TEXT;
g_object_set (data->pipeline, "flags", flags, NULL);
- if (data->native_window) {
- GST_DEBUG ("Native window already received, notifying the pipeline about it.");
- gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->pipeline), (guintptr)data->native_window);
- }
+ /* Set the pipeline to READY, so it can already accept a window handle, if we have one */
+ data->target_state = GST_STATE_READY;
+ gst_element_set_state(data->pipeline, GST_STATE_READY);
/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
bus = gst_element_get_bus (data->pipeline);
data->main_loop = NULL;
/* Free resources */
+ g_main_context_pop_thread_default(data->context);
g_main_context_unref (data->context);
data->target_state = GST_STATE_NULL;
gst_element_set_state (data->pipeline, GST_STATE_NULL);
/*
* Java Bindings
*/
-void gst_native_init (JNIEnv* env, jobject thiz) {
+
+/* Instruct the native code to create its internal data structure, pipeline and thread */
+static void gst_native_init (JNIEnv* env, jobject thiz) {
CustomData *data = g_new0 (CustomData, 1);
- data->duration = GST_CLOCK_TIME_NONE;
data->desired_position = GST_CLOCK_TIME_NONE;
data->last_seek_time = GST_CLOCK_TIME_NONE;
SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
pthread_create (&gst_app_thread, NULL, &app_function, data);
}
-void gst_native_finalize (JNIEnv* env, jobject thiz) {
+/* Quit the main loop, remove the native thread and free resources */
+static void gst_native_finalize (JNIEnv* env, jobject thiz) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data) return;
GST_DEBUG ("Quitting main loop...");
GST_DEBUG ("Done finalizing");
}
+/* Set playbin2's URI */
void gst_native_set_uri (JNIEnv* env, jobject thiz, jstring uri) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data || !data->pipeline) return;
const jbyte *char_uri = (*env)->GetStringUTFChars (env, uri, NULL);
GST_DEBUG ("Setting URI to %s", char_uri);
if (data->target_state >= GST_STATE_READY)
- gst_element_set_state (data->pipeline, GST_STATE_READY);
+ gst_element_set_state (data->pipeline, GST_STATE_READY);
g_object_set(data->pipeline, "uri", char_uri, NULL);
(*env)->ReleaseStringUTFChars (env, uri, char_uri);
data->duration = GST_CLOCK_TIME_NONE;
data->is_live = (gst_element_set_state (data->pipeline, data->target_state) == GST_STATE_CHANGE_NO_PREROLL);
}
-void gst_native_play (JNIEnv* env, jobject thiz) {
+/* Set pipeline to PLAYING state */
+static void gst_native_play (JNIEnv* env, jobject thiz) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data) return;
GST_DEBUG ("Setting state to PLAYING");
data->is_live = (gst_element_set_state (data->pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
}
-void gst_native_pause (JNIEnv* env, jobject thiz) {
+/* Set pipeline to PAUSED state */
+static void gst_native_pause (JNIEnv* env, jobject thiz) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data) return;
GST_DEBUG ("Setting state to PAUSED");
data->is_live = (gst_element_set_state (data->pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
}
+/* Instruct the pipeline to seek to a different position */
void gst_native_set_position (JNIEnv* env, jobject thiz, int milliseconds) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data) return;
gint64 desired_position = (gint64)(milliseconds * GST_MSECOND);
- if (data->state == GST_STATE_PLAYING || data->state == GST_STATE_PAUSED) {
+ if (data->state >= GST_STATE_PAUSED) {
execute_seek(desired_position, data);
} else {
- GST_DEBUG ("Scheduling seek to %d milliseconds for later", milliseconds);
+ GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later", GST_TIME_ARGS (desired_position));
data->desired_position = desired_position;
}
}
-jboolean gst_class_init (JNIEnv* env, jclass klass) {
+/* Static class initializer: retrieve method and field IDs */
+static jboolean gst_native_class_init (JNIEnv* env, jclass klass) {
custom_data_field_id = (*env)->GetFieldID (env, klass, "native_custom_data", "J");
- GST_DEBUG ("The FieldID for the native_custom_data field is %p", custom_data_field_id);
set_message_method_id = (*env)->GetMethodID (env, klass, "setMessage", "(Ljava/lang/String;)V");
- GST_DEBUG ("The MethodID for the setMessage method is %p", set_message_method_id);
set_current_position_method_id = (*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V");
- GST_DEBUG ("The MethodID for the setCurrentPosition method is %p", set_current_position_method_id);
on_gstreamer_initialized_method_id = (*env)->GetMethodID (env, klass, "onGStreamerInitialized", "()V");
- GST_DEBUG ("The MethodID for the onGStreamerInitialized method is %p", on_gstreamer_initialized_method_id);
- set_current_state_method_id = (*env)->GetMethodID (env, klass, "setCurrentState", "(I)V");
- GST_DEBUG ("The MethodID for the setCurrentState method is %p", set_current_state_method_id);
-
- if (!custom_data_field_id || !set_message_method_id || !set_current_position_method_id ||
- !on_gstreamer_initialized_method_id || !set_current_state_method_id) {
- GST_ERROR ("The calling class does not implement all necessary interface methods");
+ on_media_size_changed_method_id = (*env)->GetMethodID (env, klass, "onMediaSizeChanged", "(II)V");
+
+ if (!custom_data_field_id || !set_message_method_id || !on_gstreamer_initialized_method_id ||
+ !on_media_size_changed_method_id || !set_current_position_method_id) {
+ /* We emit this message through the Android log instead of the GStreamer log because the later
+ * has not been initialized yet.
+ */
+ __android_log_print (ANDROID_LOG_ERROR, "tutorial-4", "The calling class does not implement all necessary interface methods");
return JNI_FALSE;
}
return JNI_TRUE;
}
-void gst_native_surface_init (JNIEnv *env, jobject thiz, jobject surface) {
+static void gst_native_surface_init (JNIEnv *env, jobject thiz, jobject surface) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
if (!data) return;
- GST_DEBUG ("Received surface %p", surface);
+ ANativeWindow *new_native_window = ANativeWindow_fromSurface(env, surface);
+ GST_DEBUG ("Received surface %p (native window %p)", surface, new_native_window);
+
if (data->native_window) {
- GST_DEBUG ("Releasing previous native window %p", data->native_window);
ANativeWindow_release (data->native_window);
+ if (data->native_window == new_native_window) {
+ GST_DEBUG ("New native window is the same as the previous one", data->native_window);
+ if (data->pipeline) {
+ gst_x_overlay_expose(GST_X_OVERLAY (data->pipeline));
+ gst_x_overlay_expose(GST_X_OVERLAY (data->pipeline));
+ }
+ return;
+ } else {
+ GST_DEBUG ("Released previous native window %p", data->native_window);
+ data->initialized = FALSE;
+ }
}
- data->native_window = ANativeWindow_fromSurface(env, surface);
- GST_DEBUG ("Got Native Window %p", data->native_window);
-
- if (data->pipeline) {
- GST_DEBUG ("Pipeline already created, notifying the it about the native window.");
- gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->pipeline), (guintptr)data->native_window);
- } else {
- GST_DEBUG ("Pipeline not created yet, it will later be notified about the native window.");
- }
+ data->native_window = new_native_window;
check_initialization_complete (data);
}
-void gst_native_surface_finalize (JNIEnv *env, jobject thiz) {
+static void gst_native_surface_finalize (JNIEnv *env, jobject thiz) {
CustomData *data = GET_CUSTOM_DATA (env, thiz, custom_data_field_id);
- if (!data) {
- GST_WARNING ("Received surface finalize but there is no CustomData. Ignoring.");
- return;
- }
+ if (!data) return;
GST_DEBUG ("Releasing Native Window %p", data->native_window);
if (data->pipeline) {
- gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->pipeline), (guintptr)NULL);
- gst_element_set_state (data->pipeline, GST_STATE_NULL);
+ gst_x_overlay_set_window_handle (GST_X_OVERLAY (data->pipeline), (guintptr)NULL);
+ gst_element_set_state (data->pipeline, GST_STATE_READY);
}
ANativeWindow_release (data->native_window);
data->native_window = NULL;
+ data->initialized = FALSE;
}
+/* List of implemented native methods */
static JNINativeMethod native_methods[] = {
{ "nativeInit", "()V", (void *) gst_native_init},
{ "nativeFinalize", "()V", (void *) gst_native_finalize},
{ "nativePlay", "()V", (void *) gst_native_play},
{ "nativePause", "()V", (void *) gst_native_pause},
{ "nativeSetPosition", "(I)V", (void*) gst_native_set_position},
- { "classInit", "()Z", (void *) gst_class_init},
{ "nativeSurfaceInit", "(Ljava/lang/Object;)V", (void *) gst_native_surface_init},
- { "nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize}
+ { "nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
+ { "nativeClassInit", "()Z", (void *) gst_native_class_init}
};
+/* Library initializer */
jint JNI_OnLoad(JavaVM *vm, void *reserved) {
JNIEnv *env = NULL;
import java.util.Date;
import java.util.TimeZone;
-import com.gstreamer.GStreamer;
import com.lamerman.FileDialog;
import com.lamerman.SelectionMode;
import android.widget.TextView;
import android.widget.Toast;
+import com.gstreamer.GStreamer;
+
public class Tutorial5 extends Activity implements SurfaceHolder.Callback, OnSeekBarChangeListener {
- private native void nativeInit();
- private native void nativeFinalize();
- private native void nativeSetUri(String uri);
- private native void nativePlay();
- private native void nativePause();
- private native void nativeSetPosition(int milliseconds);
- private static native boolean classInit();
- private native void nativeSurfaceInit(Object surface);
- private native void nativeSurfaceFinalize();
- private long native_custom_data;
-
- private boolean is_playing_desired;
- private int position;
- private int duration;
- private boolean is_local_media;
- private int desired_position;
-
- private Bundle initialization_data;
+ private native void nativeInit(); // Initialize native code, build pipeline, etc
+ private native void nativeFinalize(); // Destroy pipeline and shutdown native code
+ private native void nativeSetUri(String uri); // Set the URI of the media to play
+ private native void nativePlay(); // Set pipeline to PLAYING
+ private native void nativeSetPosition(int milliseconds); // Seek to the indicated position, in milliseconds
+ 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); // A new surface is available
+ private native void nativeSurfaceFinalize(); // Surface about to be destroyed
+ 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 int position; // Current position, reported by native code
+ private int duration; // Current clip duration, reported by native code
+ private boolean is_local_media; // Whether this clip is stored locally or is being streamed
+ private int desired_position; // Position where the users wants to seek to
+ private String mediaUri; // URI of the clip being played
+
+ private final String defaultMediaUri = "http://docs.gstreamer.com/media/sintel_trailer-368p.ogv";
- private PowerManager.WakeLock wake_lock;
-
- private String mediaUri = "http://docs.gstreamer.com/media/sintel_trailer-480p.ogv";
static private final int PICK_FILE_CODE = 1;
-
- /* Called when the activity is first created. */
+
+ private PowerManager.WakeLock wake_lock;
+
+ // 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);
+ GStreamer.init(this);
} catch (Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
finish();
nativePause();
}
});
-
+
ImageButton select = (ImageButton) this.findViewById(R.id.button_select);
select.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
sb.setOnSeekBarChangeListener(this);
- initialization_data = savedInstanceState;
-
+ // Retrieve our previous state, or initialize it to default values
+ if (savedInstanceState != null) {
+ is_playing_desired = savedInstanceState.getBoolean("playing");
+ position = savedInstanceState.getInt("position");
+ duration = savedInstanceState.getInt("duration");
+ mediaUri = savedInstanceState.getString("mediaUri");
+ Log.i ("GStreamer", "Activity created with saved state:");
+ } else {
+ is_playing_desired = false;
+ position = duration = 0;
+ mediaUri = defaultMediaUri;
+ Log.i ("GStreamer", "Activity created with no saved state:");
+ }
is_local_media = false;
- is_playing_desired = false;
+ Log.i ("GStreamer", " playing:" + is_playing_desired + " position:" + position +
+ " duration: " + duration + " uri: " + mediaUri);
+
+ // 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);
nativeInit();
}
-
+
protected void onSaveInstanceState (Bundle outState) {
- Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired + " position:" + position + " uri: " + mediaUri);
+ Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired + " position:" + position +
+ " duration: " + duration + " uri: " + mediaUri);
outState.putBoolean("playing", is_playing_desired);
outState.putInt("position", position);
outState.putInt("duration", duration);
super.onDestroy();
}
- /* Called from native code */
+ // 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() {
}
});
}
-
+
+ // Set the URI to play, and record whether it is a local or remote file
private void setMediaUri() {
nativeSetUri (mediaUri);
- if (mediaUri.startsWith("file://")) is_local_media = true;
+ is_local_media = mediaUri.startsWith("file://");
}
- /* Called from native code */
+ // 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 != null) {
- is_playing_desired = initialization_data.getBoolean("playing");
- int milliseconds = initialization_data.getInt("position");
- Log.i ("GStreamer", "Restoring state, playing:" + is_playing_desired + " position:" + milliseconds + " ms.");
- mediaUri = initialization_data.getString ("mediaUri");
- /* Actually, move to one millisecond in the future. Otherwise, due to rounding errors between the
- * milliseconds used here and the nanoseconds used by GStreamer, we would be jumping a bit behind
- * where we were before. This, combined with seeking to keyframe positions, would skip one keyframe
- * backwards on each iteration.
- */
- nativeSetPosition(milliseconds + 1);
- }
-
+ Log.i ("GStreamer", "GStreamer initialized:");
+ Log.i ("GStreamer", " playing:" + is_playing_desired + " position:" + position + " uri: " + mediaUri);
+
+ // Restore previous playing state
setMediaUri ();
+ nativeSetPosition (position);
if (is_playing_desired) {
nativePlay();
wake_lock.acquire();
nativePause();
wake_lock.release();
}
+
+ // 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);
+ }
+ });
}
- /* The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
- * it is an actual pipeline position or the position the user is currently dragging to.
- */
+ // The text widget acts as an slave for the seek bar, so it reflects what the seek bar shows, whether
+ // it is an actual pipeline position or the position the user is currently dragging to.
private void updateTimeWidget () {
final TextView tv = (TextView) this.findViewById(R.id.textview_time);
final SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
final String message = df.format(new Date (pos)) + " / " + df.format(new Date (duration));
- tv.setText(message);
+ tv.setText(message);
}
- /* Called from native code */
+ // Called from native code
private void setCurrentPosition(final int position, final int duration) {
final SeekBar sb = (SeekBar) this.findViewById(R.id.seek_bar);
-
- /* Ignore position messages from the pipeline if the seek bar is being dragged */
+
+ // Ignore position messages from the pipeline if the seek bar is being dragged
if (sb.isPressed()) return;
runOnUiThread (new Runnable() {
this.duration = duration;
}
- /* Called from native code */
- private void setCurrentState (int state) {
- Log.d ("GStreamer", "State has changed to " + state);
- switch (state) {
- case 1:
- setMessage ("NULL");
- break;
- case 2:
- setMessage ("READY");
- break;
- case 3:
- setMessage ("PAUSED");
- break;
- case 4:
- setMessage ("PLAYING");
- break;
- }
- }
-
static {
System.loadLibrary("gstreamer_android");
System.loadLibrary("tutorial-5");
- classInit();
+ nativeClassInit();
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,
nativeSurfaceFinalize ();
}
+ // Called from native code when the size of the media changes or is first detected.
+ // Inform the video surface about the new size and recalculate the layout.
+ private void onMediaSizeChanged (int width, int height) {
+ Log.i ("GStreamer", "Media size changed to " + width + "x" + height);
+ final GStreamerSurfaceView gsv = (GStreamerSurfaceView) this.findViewById(R.id.surface_video);
+ gsv.media_width = width;
+ gsv.media_height = height;
+ runOnUiThread(new Runnable() {
+ public void run() {
+ gsv.requestLayout();
+ }
+ });
+ }
+
+ // The Seek Bar thumb has moved, either because the user dragged it or we have called setProgress()
public void onProgressChanged(SeekBar sb, int progress, boolean fromUser) {
if (fromUser == false) return;
desired_position = progress;
- /* If this is a local file, allow scrub seeking, this is, seek soon as the slider
- * is moved.
- */
+ // If this is a local file, allow scrub seeking, this is, seek as soon as the slider is moved.
if (is_local_media) nativeSetPosition(desired_position);
updateTimeWidget();
}
+ // The user started dragging the Seek Bar thumb
public void onStartTrackingTouch(SeekBar sb) {
nativePause();
}
+ // The user released the Seek Bar thumb
public void onStopTrackingTouch(SeekBar sb) {
- /* If this is a remote file, scrub seeking is probably not going to work smoothly enough.
- * Therefore, perform only the seek when the slider is released.
- */
+ // If this is a remote file, scrub seeking is probably not going to work smoothly enough.
+ // Therefore, perform only the seek when the slider is released.
if (!is_local_media) nativeSetPosition(desired_position);
if (is_playing_desired) nativePlay();
}
-
+
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
mediaUri = "file://" + data.getStringExtra(FileDialog.RESULT_PATH);
setMediaUri();
}
- }
+ }
}
projects / platform / upstream / gstreamer.git / commitdiff