9dd3162dbe
Avoid compiler warnings about unhandled enum values by using a regular if-else statement.
427 lines
11 KiB
C
427 lines
11 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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#include "config.h"
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#define GST_USE_UNSTABLE_API
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#include <gst/base/gstpushsrc.h>
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#include "shell-recorder-src.h"
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struct _ShellRecorderSrc
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{
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GstPushSrc parent;
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GMutex mutex;
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GstCaps *caps;
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GMutex queue_lock;
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GCond queue_cond;
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GQueue *queue;
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gboolean eos;
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gboolean flushing;
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guint memory_used;
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guint memory_used_update_idle;
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};
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struct _ShellRecorderSrcClass
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{
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GstPushSrcClass parent_class;
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};
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enum {
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PROP_0,
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PROP_CAPS,
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PROP_MEMORY_USED
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};
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#define shell_recorder_src_parent_class parent_class
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G_DEFINE_TYPE(ShellRecorderSrc, shell_recorder_src, GST_TYPE_PUSH_SRC);
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static void
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shell_recorder_src_init (ShellRecorderSrc *src)
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{
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gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
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gst_base_src_set_live (GST_BASE_SRC (src), TRUE);
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src->queue = g_queue_new ();
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g_mutex_init (&src->mutex);
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g_mutex_init (&src->queue_lock);
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g_cond_init (&src->queue_cond);
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}
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static gboolean
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shell_recorder_src_memory_used_update_idle (gpointer data)
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{
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ShellRecorderSrc *src = data;
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g_mutex_lock (&src->mutex);
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src->memory_used_update_idle = 0;
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g_mutex_unlock (&src->mutex);
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g_object_notify (G_OBJECT (src), "memory-used");
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return FALSE;
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}
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/* The memory_used property is used to monitor buffer usage,
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* so we marshal notification back to the main loop thread.
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*/
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static void
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shell_recorder_src_update_memory_used (ShellRecorderSrc *src,
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int delta)
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{
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g_mutex_lock (&src->mutex);
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src->memory_used += delta;
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if (src->memory_used_update_idle == 0)
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{
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src->memory_used_update_idle = g_idle_add (shell_recorder_src_memory_used_update_idle, src);
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g_source_set_name_by_id (src->memory_used_update_idle, "[gnome-shell] shell_recorder_src_memory_used_update_idle");
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}
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g_mutex_unlock (&src->mutex);
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}
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/* _negotiate() is called when we have to decide on a format. We
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* use the configured format */
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static gboolean
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shell_recorder_src_negotiate (GstBaseSrc * base_src)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
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gboolean result;
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result = gst_base_src_set_caps (base_src, src->caps);
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return result;
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}
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static gboolean
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shell_recorder_src_unlock (GstBaseSrc * base_src)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
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g_mutex_lock (&src->queue_lock);
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src->flushing = TRUE;
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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return TRUE;
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}
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static gboolean
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shell_recorder_src_unlock_stop (GstBaseSrc * base_src)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
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g_mutex_lock (&src->queue_lock);
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src->flushing = FALSE;
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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return TRUE;
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}
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static gboolean
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shell_recorder_src_start (GstBaseSrc * base_src)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
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g_mutex_lock (&src->queue_lock);
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src->flushing = FALSE;
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src->eos = FALSE;
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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return TRUE;
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}
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static gboolean
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shell_recorder_src_stop (GstBaseSrc * base_src)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (base_src);
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g_mutex_lock (&src->queue_lock);
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src->flushing = TRUE;
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src->eos = FALSE;
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g_queue_foreach (src->queue, (GFunc) gst_buffer_unref, NULL);
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g_queue_clear (src->queue);
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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return TRUE;
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}
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static gboolean
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shell_recorder_src_send_event (GstElement * element, GstEvent * event)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (element);
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gboolean res;
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if (GST_EVENT_TYPE (event) == GST_EVENT_EOS)
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{
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shell_recorder_src_close (src);
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gst_event_unref (event);
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res = TRUE;
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}
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else
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{
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res = GST_CALL_PARENT_WITH_DEFAULT (GST_ELEMENT_CLASS, send_event, (element,
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event), FALSE);
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}
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return res;
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}
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/* The create() virtual function is responsible for returning the next buffer.
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* We just pop buffers off of the queue and block if necessary.
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*/
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static GstFlowReturn
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shell_recorder_src_create (GstPushSrc *push_src,
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GstBuffer **buffer_out)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (push_src);
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GstBuffer *buffer;
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g_mutex_lock (&src->queue_lock);
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while (TRUE) {
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/* int the flushing state we just return FLUSHING */
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if (src->flushing) {
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g_mutex_unlock (&src->queue_lock);
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return GST_FLOW_FLUSHING;
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}
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buffer = g_queue_pop_head (src->queue);
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/* we have a buffer, exit the loop to handle it */
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if (buffer != NULL)
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break;
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/* no buffer, check EOS */
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if (src->eos) {
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g_mutex_unlock (&src->queue_lock);
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return GST_FLOW_EOS;
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}
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/* wait for something to happen and try again */
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g_cond_wait (&src->queue_cond, &src->queue_lock);
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}
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g_mutex_unlock (&src->queue_lock);
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shell_recorder_src_update_memory_used (src,
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- (int)(gst_buffer_get_size(buffer) / 1024));
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*buffer_out = buffer;
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return GST_FLOW_OK;
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}
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static void
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shell_recorder_src_set_caps (ShellRecorderSrc *src,
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const GstCaps *caps)
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{
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if (caps == src->caps)
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return;
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if (src->caps != NULL)
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{
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gst_caps_unref (src->caps);
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src->caps = NULL;
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}
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if (caps)
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{
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/* The capabilities will be negotated with the downstream element
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* and set on the pad when the first buffer is pushed.
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*/
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src->caps = gst_caps_copy (caps);
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}
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else
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src->caps = NULL;
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}
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static void
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shell_recorder_src_finalize (GObject *object)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
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if (src->memory_used_update_idle)
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g_source_remove (src->memory_used_update_idle);
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shell_recorder_src_set_caps (src, NULL);
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g_queue_free_full (src->queue, (GDestroyNotify) gst_buffer_unref);
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g_mutex_clear (&src->mutex);
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g_mutex_clear (&src->queue_lock);
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g_cond_clear (&src->queue_cond);
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G_OBJECT_CLASS (shell_recorder_src_parent_class)->finalize (object);
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}
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static void
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shell_recorder_src_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
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switch (prop_id)
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{
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case PROP_CAPS:
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shell_recorder_src_set_caps (src, gst_value_get_caps (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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shell_recorder_src_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ShellRecorderSrc *src = SHELL_RECORDER_SRC (object);
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switch (prop_id)
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{
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case PROP_CAPS:
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gst_value_set_caps (value, src->caps);
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break;
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case PROP_MEMORY_USED:
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g_mutex_lock (&src->mutex);
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g_value_set_uint (value, src->memory_used);
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g_mutex_unlock (&src->mutex);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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shell_recorder_src_class_init (ShellRecorderSrcClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GstBaseSrcClass *base_src_class = GST_BASE_SRC_CLASS (klass);
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GstPushSrcClass *push_src_class = GST_PUSH_SRC_CLASS (klass);
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static GstStaticPadTemplate src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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object_class->finalize = shell_recorder_src_finalize;
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object_class->set_property = shell_recorder_src_set_property;
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object_class->get_property = shell_recorder_src_get_property;
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g_object_class_install_property (object_class,
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PROP_CAPS,
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g_param_spec_boxed ("caps",
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"Caps",
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"Fixed GstCaps for the source",
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GST_TYPE_CAPS,
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G_PARAM_READWRITE));
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g_object_class_install_property (object_class,
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PROP_MEMORY_USED,
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g_param_spec_uint ("memory-used",
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"Memory Used",
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"Memory currently used by the queue (in kB)",
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0, G_MAXUINT, 0,
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G_PARAM_READABLE));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details_simple (element_class,
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"ShellRecorderSrc",
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"Generic/Src",
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"Feed screen capture data to a pipeline",
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"Owen Taylor <otaylor@redhat.com>");
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element_class->send_event = shell_recorder_src_send_event;
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base_src_class->negotiate = shell_recorder_src_negotiate;
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base_src_class->unlock = shell_recorder_src_unlock;
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base_src_class->unlock_stop = shell_recorder_src_unlock_stop;
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base_src_class->start = shell_recorder_src_start;
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base_src_class->stop = shell_recorder_src_stop;
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push_src_class->create = shell_recorder_src_create;
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}
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/**
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* shell_recorder_src_add_buffer:
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*
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* Adds a buffer to the internal queue to be pushed out at the next opportunity.
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* There is no flow control, so arbitrary amounts of memory may be used by
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* the buffers on the queue. The buffer contents must match the #GstCaps
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* set in the :caps property.
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*/
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void
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shell_recorder_src_add_buffer (ShellRecorderSrc *src,
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GstBuffer *buffer)
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{
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g_return_if_fail (SHELL_IS_RECORDER_SRC (src));
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g_return_if_fail (src->caps != NULL);
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shell_recorder_src_update_memory_used (src,
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(int)(gst_buffer_get_size(buffer) / 1024));
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g_mutex_lock (&src->queue_lock);
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g_queue_push_tail (src->queue, gst_buffer_ref (buffer));
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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}
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/**
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* shell_recorder_src_close:
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*
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* Indicates the end of the input stream. Once all previously added buffers have
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* been pushed out an end-of-stream message will be sent.
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*/
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void
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shell_recorder_src_close (ShellRecorderSrc *src)
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{
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/* We can't send a message to the source immediately or buffers that haven't
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* been pushed yet will be discarded. Instead mark ourselves EOS, which will
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* make us send an event once everything has been pushed.
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*/
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g_mutex_lock (&src->queue_lock);
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src->eos = TRUE;
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g_cond_signal (&src->queue_cond);
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g_mutex_unlock (&src->queue_lock);
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}
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static gboolean
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plugin_init (GstPlugin *plugin)
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{
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gst_element_register(plugin, "shellrecordersrc", GST_RANK_NONE,
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SHELL_TYPE_RECORDER_SRC);
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return TRUE;
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}
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/**
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* shell_recorder_src_register:
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*
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* Registers a plugin holding our single element to use privately in
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* this application. Can safely be called multiple times.
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*/
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void
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shell_recorder_src_register (void)
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{
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static gboolean registered = FALSE;
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if (registered)
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return;
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gst_plugin_register_static (GST_VERSION_MAJOR, GST_VERSION_MINOR,
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"shellrecorder",
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"Plugin for ShellRecorder",
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plugin_init,
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"0.1",
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"LGPL",
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"gnome-shell", "gnome-shell", "http://live.gnome.org/GnomeShell");
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registered = TRUE;
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}
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