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拿掉無用的seek to功能

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This commit is contained in:
Barney 2022-08-08 14:34:48 +08:00
parent 3e6d7e9e1c
commit 62503432b0
2 changed files with 328 additions and 479 deletions
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2
.idea/misc.xml
View File

@ -16,5 +16,5 @@
</option>
</component>
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="ProjectRootManager" version="2" languageLevel="JDK_16_PREVIEW" project-jdk-name="16" project-jdk-type="JavaSDK" />
<component name="ProjectRootManager" version="2" languageLevel="JDK_16" project-jdk-name="16" project-jdk-type="JavaSDK" />
</project>

167
gstreamer_player/jni/gst_player.c
View File

@ -24,13 +24,8 @@ GST_DEBUG_CATEGORY_STATIC (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
{
typedef struct _CustomData {
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 */
@ -39,15 +34,11 @@ typedef struct _CustomData
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
{
typedef enum {
GST_PLAY_FLAG_TEXT = (1 << 2) /* We want subtitle output */
} GstPlayFlags;
@ -57,7 +48,6 @@ 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 on_gstreamer_initialized_method_id;
static jmethodID on_media_size_changed_method_id;
@ -114,100 +104,6 @@ static void set_ui_message (const gchar * message, CustomData * data) {
(*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 ();
(*env)->CallVoidMethod (env, data->app, set_current_position_method_id,
position, duration);
if ((*env)->ExceptionCheck (env)) {
GST_ERROR ("Failed to call Java method");
(*env)->ExceptionClear (env);
}
}
/* 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) {
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)
return TRUE;
/* If we didn't know it yet, query the stream duration */
if (!GST_CLOCK_TIME_IS_VALID (data->duration)) {
if (!gst_element_query_duration (data->pipeline, GST_FORMAT_TIME,
&data->duration)) {
/*GST_WARNING
("Could not query current duration (normal for still pictures)");*/
data->duration = 0;
}
}
if (!gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
/*GST_WARNING
("Could not query current position (normal for still pictures)");*/
position = 0;
}
/* Java expects these values in milliseconds, and GStreamer provides nanoseconds */
set_current_ui_position (position / GST_MSECOND, data->duration / GST_MSECOND,
data);
return TRUE;
}
/* 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) {
gint64 diff;
if (desired_position == GST_CLOCK_TIME_NONE)
return;
diff = gst_util_get_timestamp () - data->last_seek_time;
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 (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 (SEEK_MIN_DELAY - diff));
} else {
/* 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;
}
}
/* 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;
@ -229,15 +125,8 @@ static void error_cb (GstBus * bus, GstMessage * msg, CustomData * data) {
/* 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) {
data->target_state = GST_STATE_PAUSED;
data->is_live |=
(gst_element_set_state (data->pipeline,
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
@ -319,10 +208,6 @@ static void state_changed_cb (GstBus * bus, GstMessage * msg, CustomData * data)
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);
}
}
}
@ -397,20 +282,12 @@ static void *app_function (void *userdata) {
g_signal_connect (G_OBJECT(bus), "message::eos", (GCallback) eos_cb, data);
g_signal_connect (G_OBJECT(bus), "message::state-changed",
(GCallback) state_changed_cb, data);
g_signal_connect (G_OBJECT (bus), "message::duration",
(GCallback) duration_cb, data);
g_signal_connect (G_OBJECT(bus), "message::buffering",
(GCallback) buffering_cb, data);
g_signal_connect (G_OBJECT(bus), "message::clock-lost",
(GCallback) clock_lost_cb, data);
gst_object_unref(bus);
/* Register a function that GLib will call 4 times per second */
timeout_source = g_timeout_source_new (250);
g_source_set_callback (timeout_source, (GSourceFunc) refresh_ui, data, NULL);
g_source_attach (timeout_source, data->context);
g_source_unref (timeout_source);
/* Create a GLib Main Loop and set it to run */
GST_DEBUG ("Entering main loop... (CustomData:%p)", data);
data->main_loop = g_main_loop_new(data->context, FALSE);
@ -437,8 +314,6 @@ static void *app_function (void *userdata) {
/* 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->desired_position = GST_CLOCK_TIME_NONE;
data->last_seek_time = GST_CLOCK_TIME_NONE;
SET_CUSTOM_DATA (env, thiz, custom_data_field_id, data);
GST_DEBUG_CATEGORY_INIT (debug_category, "player", 0,
"Android tutorial 5");
@ -477,10 +352,8 @@ void gst_native_set_uri (JNIEnv * env, jobject thiz, jstring uri) {
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);
(gst_element_set_state(data->pipeline, data->target_state) == GST_STATE_CHANGE_NO_PREROLL);
}
/* Set pipeline to PLAYING state */
@ -490,9 +363,7 @@ static void gst_native_play (JNIEnv * env, jobject thiz) {
return;
GST_DEBUG ("Setting state to PLAYING");
data->target_state = GST_STATE_PLAYING;
data->is_live |=
(gst_element_set_state (data->pipeline,
GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
data->is_live |= (gst_element_set_state(data->pipeline, GST_STATE_PLAYING) == GST_STATE_CHANGE_NO_PREROLL);
}
/* Set pipeline to PAUSED state */
@ -502,24 +373,7 @@ static void gst_native_pause (JNIEnv * env, jobject thiz) {
return;
GST_DEBUG ("Setting state to PAUSED");
data->target_state = GST_STATE_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_PAUSED) {
execute_seek (desired_position, data);
} else {
GST_DEBUG ("Scheduling seek to %" GST_TIME_FORMAT " for later",
GST_TIME_ARGS (desired_position));
data->desired_position = desired_position;
}
data->is_live |=(gst_element_set_state(data->pipeline, GST_STATE_PAUSED) == GST_STATE_CHANGE_NO_PREROLL);
}
/* Static class initializer: retrieve method and field IDs */
@ -528,16 +382,13 @@ static jboolean gst_native_class_init (JNIEnv * env, jclass klass) {
(*env)->GetFieldID(env, klass, "native_custom_data", "J");
set_message_method_id =
(*env)->GetMethodID(env, klass, "setMessage", "(Ljava/lang/String;)V");
set_current_position_method_id =
(*env)->GetMethodID (env, klass, "setCurrentPosition", "(II)V");
on_gstreamer_initialized_method_id =
(*env)->GetMethodID(env, klass, "onGStreamerInitialized", "()V");
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) {
|| !on_gstreamer_initialized_method_id || !on_media_size_changed_method_id) {
/* We emit this message through the Android log instead of the GStreamer log because the later
* has not been initialized yet.
*/
@ -600,7 +451,6 @@ static JNINativeMethod native_methods[] = {
{"nativeSetUri", "(Ljava/lang/String;)V", (void *) gst_native_set_uri},
{"nativePlay", "()V", (void *) gst_native_play},
{"nativePause", "()V", (void *) gst_native_pause},
{"nativeSetPosition", "(I)V", (void *) gst_native_set_position},
{"nativeSurfaceInit", "(Ljava/lang/Object;)V",
(void *) gst_native_surface_init},
{"nativeSurfaceFinalize", "()V", (void *) gst_native_surface_finalize},
@ -618,8 +468,7 @@ jint JNI_OnLoad (JavaVM * vm, void *reserved) {
"Could not retrieve JNIEnv");
return 0;
}
jclass klass = (*env)->FindClass (env,
"com/hisharp/gstreamer_player/GstLibrary");
jclass klass = (*env)->FindClass(env, "com/hisharp/gstreamer_player/GstLibrary");
(*env)->RegisterNatives(env, klass, native_methods,
G_N_ELEMENTS (native_methods));