/* GStreamer * Copyright (C) 2007 David Schleef * (C) 2008 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:gstappsrc * @short_description: Easy way for applications to inject buffers into a * pipeline * @see_also: #GstBaseSrc, appsink * * The appsrc element can be used by applications to insert data into a * GStreamer pipeline. Unlike most GStreamer elements, Appsrc provides * external API functions. * * appsrc can be used by linking with the libgstapp library to access the * methods directly or by using the appsrc action signals. * * Before operating appsrc, the caps property must be set to a fixed caps * describing the format of the data that will be pushed with appsrc. An * exception to this is when pushing buffers with unknown caps, in which case no * caps should be set. This is typically true of file-like sources that push raw * byte buffers. * * The main way of handing data to the appsrc element is by calling the * gst_app_src_push_buffer() method or by emitting the push-buffer action signal. * This will put the buffer onto a queue from which appsrc will read from in its * streaming thread. It is important to note that data transport will not happen * from the thread that performed the push-buffer call. * * The "max-bytes" property controls how much data can be queued in appsrc * before appsrc considers the queue full. A filled internal queue will always * signal the "enough-data" signal, which signals the application that it should * stop pushing data into appsrc. The "block" property will cause appsrc to * block the push-buffer method until free data becomes available again. * * When the internal queue is running out of data, the "need-data" signal is * emitted, which signals the application that it should start pushing more data * into appsrc. * * In addition to the "need-data" and "enough-data" signals, appsrc can emit the * "seek-data" signal when the "stream-mode" property is set to "seekable" or * "random-access". The signal argument will contain the new desired position in * the stream expressed in the unit set with the "format" property. After * receiving the seek-data signal, the application should push-buffers from the * new position. * * These signals allow the application to operate the appsrc in two different * ways: * * The push model, in which the application repeatedly calls the push-buffer method * with a new buffer. Optionally, the queue size in the appsrc can be controlled * with the enough-data and need-data signals by respectively stopping/starting * the push-buffer calls. This is a typical mode of operation for the * stream-type "stream" and "seekable". Use this model when implementing various * network protocols or hardware devices. * * The pull model where the need-data signal triggers the next push-buffer call. * This mode is typically used in the "random-access" stream-type. Use this * model for file access or other randomly accessable sources. In this mode, a * buffer of exactly the amount of bytes given by the need-data signal should be * pushed into appsrc. * * In all modes, the size property on appsrc should contain the total stream * size in bytes. Setting this property is mandatory in the random-access mode. * For the stream and seekable modes, setting this property is optional but * recommended. * * When the application is finished pushing data into appsrc, it should call * gst_app_src_end_of_stream() or emit the end-of-stream action signal. After * this call, no more buffers can be pushed into appsrc until a flushing seek * happened or the state of the appsrc has gone through READY. * * Last reviewed on 2008-12-17 (0.10.10) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstapp-marshal.h" #include "gstappsrc.h" #include "gst/glib-compat-private.h" struct _GstAppSrcPrivate { GCond *cond; GMutex *mutex; GQueue *queue; GstCaps *caps; gint64 size; GstAppStreamType stream_type; guint64 max_bytes; GstFormat format; gboolean block; gchar *uri; gboolean new_caps; gboolean flushing; gboolean started; gboolean is_eos; guint64 queued_bytes; guint64 offset; GstAppStreamType current_type; guint64 min_latency; guint64 max_latency; gboolean emit_signals; guint min_percent; GstAppSrcCallbacks callbacks; gpointer user_data; GDestroyNotify notify; }; GST_DEBUG_CATEGORY_STATIC (app_src_debug); #define GST_CAT_DEFAULT app_src_debug enum { /* signals */ SIGNAL_NEED_DATA, SIGNAL_ENOUGH_DATA, SIGNAL_SEEK_DATA, /* actions */ SIGNAL_PUSH_BUFFER, SIGNAL_END_OF_STREAM, LAST_SIGNAL }; #define DEFAULT_PROP_SIZE -1 #define DEFAULT_PROP_STREAM_TYPE GST_APP_STREAM_TYPE_STREAM #define DEFAULT_PROP_MAX_BYTES 200000 #define DEFAULT_PROP_FORMAT GST_FORMAT_BYTES #define DEFAULT_PROP_BLOCK FALSE #define DEFAULT_PROP_IS_LIVE FALSE #define DEFAULT_PROP_MIN_LATENCY -1 #define DEFAULT_PROP_MAX_LATENCY -1 #define DEFAULT_PROP_EMIT_SIGNALS TRUE #define DEFAULT_PROP_MIN_PERCENT 0 enum { PROP_0, PROP_CAPS, PROP_SIZE, PROP_STREAM_TYPE, PROP_MAX_BYTES, PROP_FORMAT, PROP_BLOCK, PROP_IS_LIVE, PROP_MIN_LATENCY, PROP_MAX_LATENCY, PROP_EMIT_SIGNALS, PROP_MIN_PERCENT, PROP_LAST }; static GstStaticPadTemplate gst_app_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY); GType gst_app_stream_type_get_type (void) { static volatile gsize stream_type_type = 0; static const GEnumValue stream_type[] = { {GST_APP_STREAM_TYPE_STREAM, "GST_APP_STREAM_TYPE_STREAM", "stream"}, {GST_APP_STREAM_TYPE_SEEKABLE, "GST_APP_STREAM_TYPE_SEEKABLE", "seekable"}, {GST_APP_STREAM_TYPE_RANDOM_ACCESS, "GST_APP_STREAM_TYPE_RANDOM_ACCESS", "random-access"}, {0, NULL, NULL} }; if (g_once_init_enter (&stream_type_type)) { GType tmp = g_enum_register_static ("GstAppStreamType", stream_type); g_once_init_leave (&stream_type_type, tmp); } return (GType) stream_type_type; } static void gst_app_src_uri_handler_init (gpointer g_iface, gpointer iface_data); static void gst_app_src_dispose (GObject * object); static void gst_app_src_finalize (GObject * object); static void gst_app_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_app_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_app_src_set_latencies (GstAppSrc * appsrc, gboolean do_min, guint64 min, gboolean do_max, guint64 max); static gboolean gst_app_src_negotiate (GstBaseSrc * basesrc); static GstCaps *gst_app_src_internal_get_caps (GstBaseSrc * bsrc, GstCaps * filter); static GstFlowReturn gst_app_src_create (GstBaseSrc * bsrc, guint64 offset, guint size, GstBuffer ** buf); static gboolean gst_app_src_start (GstBaseSrc * bsrc); static gboolean gst_app_src_stop (GstBaseSrc * bsrc); static gboolean gst_app_src_unlock (GstBaseSrc * bsrc); static gboolean gst_app_src_unlock_stop (GstBaseSrc * bsrc); static gboolean gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment); static gboolean gst_app_src_is_seekable (GstBaseSrc * src); static gboolean gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size); static gboolean gst_app_src_query (GstBaseSrc * src, GstQuery * query); static GstFlowReturn gst_app_src_push_buffer_action (GstAppSrc * appsrc, GstBuffer * buffer); static guint gst_app_src_signals[LAST_SIGNAL] = { 0 }; #define gst_app_src_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstAppSrc, gst_app_src, GST_TYPE_BASE_SRC, G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_app_src_uri_handler_init)); static void gst_app_src_class_init (GstAppSrcClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstElementClass *element_class = (GstElementClass *) klass; GstBaseSrcClass *basesrc_class = (GstBaseSrcClass *) klass; GST_DEBUG_CATEGORY_INIT (app_src_debug, "appsrc", 0, "appsrc element"); gobject_class->dispose = gst_app_src_dispose; gobject_class->finalize = gst_app_src_finalize; gobject_class->set_property = gst_app_src_set_property; gobject_class->get_property = gst_app_src_get_property; /** * GstAppSrc::caps: * * The GstCaps that will negotiated downstream and will be put * on outgoing buffers. */ g_object_class_install_property (gobject_class, PROP_CAPS, g_param_spec_boxed ("caps", "Caps", "The allowed caps for the src pad", GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::format: * * The format to use for segment events. When the source is producing * timestamped buffers this property should be set to GST_FORMAT_TIME. */ g_object_class_install_property (gobject_class, PROP_FORMAT, g_param_spec_enum ("format", "Format", "The format of the segment events and seek", GST_TYPE_FORMAT, DEFAULT_PROP_FORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::size: * * The total size in bytes of the data stream. If the total size is known, it * is recommended to configure it with this property. */ g_object_class_install_property (gobject_class, PROP_SIZE, g_param_spec_int64 ("size", "Size", "The size of the data stream in bytes (-1 if unknown)", -1, G_MAXINT64, DEFAULT_PROP_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::stream-type: * * The type of stream that this source is producing. For seekable streams the * application should connect to the seek-data signal. */ g_object_class_install_property (gobject_class, PROP_STREAM_TYPE, g_param_spec_enum ("stream-type", "Stream Type", "the type of the stream", GST_TYPE_APP_STREAM_TYPE, DEFAULT_PROP_STREAM_TYPE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::max-bytes: * * The maximum amount of bytes that can be queued internally. * After the maximum amount of bytes are queued, appsrc will emit the * "enough-data" signal. */ g_object_class_install_property (gobject_class, PROP_MAX_BYTES, g_param_spec_uint64 ("max-bytes", "Max bytes", "The maximum number of bytes to queue internally (0 = unlimited)", 0, G_MAXUINT64, DEFAULT_PROP_MAX_BYTES, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::block: * * When max-bytes are queued and after the enough-data signal has been emitted, * block any further push-buffer calls until the amount of queued bytes drops * below the max-bytes limit. */ g_object_class_install_property (gobject_class, PROP_BLOCK, g_param_spec_boolean ("block", "Block", "Block push-buffer when max-bytes are queued", DEFAULT_PROP_BLOCK, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::is-live: * * Instruct the source to behave like a live source. This includes that it * will only push out buffers in the PLAYING state. */ g_object_class_install_property (gobject_class, PROP_IS_LIVE, g_param_spec_boolean ("is-live", "Is Live", "Whether to act as a live source", DEFAULT_PROP_IS_LIVE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::min-latency: * * The minimum latency of the source. A value of -1 will use the default * latency calculations of #GstBaseSrc. */ g_object_class_install_property (gobject_class, PROP_MIN_LATENCY, g_param_spec_int64 ("min-latency", "Min Latency", "The minimum latency (-1 = default)", -1, G_MAXINT64, DEFAULT_PROP_MIN_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::max-latency: * * The maximum latency of the source. A value of -1 means an unlimited amout * of latency. */ g_object_class_install_property (gobject_class, PROP_MAX_LATENCY, g_param_spec_int64 ("max-latency", "Max Latency", "The maximum latency (-1 = unlimited)", -1, G_MAXINT64, DEFAULT_PROP_MAX_LATENCY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::emit-signals: * * Make appsrc emit the "need-data", "enough-data" and "seek-data" signals. * This option is by default enabled for backwards compatibility reasons but * can disabled when needed because signal emission is expensive. */ g_object_class_install_property (gobject_class, PROP_EMIT_SIGNALS, g_param_spec_boolean ("emit-signals", "Emit signals", "Emit need-data, enough-data and seek-data signals", DEFAULT_PROP_EMIT_SIGNALS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::empty-percent: * * Make appsrc emit the "need-data" signal when the amount of bytes in the * queue drops below this percentage of max-bytes. */ g_object_class_install_property (gobject_class, PROP_MIN_PERCENT, g_param_spec_uint ("min-percent", "Min Percent", "Emit need-data when queued bytes drops below this percent of max-bytes", 0, 100, DEFAULT_PROP_MIN_PERCENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstAppSrc::need-data: * @appsrc: the appsrc element that emitted the signal * @length: the amount of bytes needed. * * Signal that the source needs more data. In the callback or from another * thread you should call push-buffer or end-of-stream. * * @length is just a hint and when it is set to -1, any number of bytes can be * pushed into @appsrc. * * You can call push-buffer multiple times until the enough-data signal is * fired. */ gst_app_src_signals[SIGNAL_NEED_DATA] = g_signal_new ("need-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAppSrcClass, need_data), NULL, NULL, __gst_app_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT); /** * GstAppSrc::enough-data: * @appsrc: the appsrc element that emitted the signal * * Signal that the source has enough data. It is recommended that the * application stops calling push-buffer until the need-data signal is * emitted again to avoid excessive buffer queueing. */ gst_app_src_signals[SIGNAL_ENOUGH_DATA] = g_signal_new ("enough-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAppSrcClass, enough_data), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE); /** * GstAppSrc::seek-data: * @appsrc: the appsrc element that emitted the signal * @offset: the offset to seek to * * Seek to the given offset. The next push-buffer should produce buffers from * the new @offset. * This callback is only called for seekable stream types. * * Returns: %TRUE if the seek succeeded. */ gst_app_src_signals[SIGNAL_SEEK_DATA] = g_signal_new ("seek-data", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstAppSrcClass, seek_data), NULL, NULL, __gst_app_marshal_BOOLEAN__UINT64, G_TYPE_BOOLEAN, 1, G_TYPE_UINT64); /** * GstAppSrc::push-buffer: * @appsrc: the appsrc * @buffer: a buffer to push * * Adds a buffer to the queue of buffers that the appsrc element will * push to its source pad. This function does not take ownership of the * buffer so the buffer needs to be unreffed after calling this function. * * When the block property is TRUE, this function can block until free space * becomes available in the queue. */ gst_app_src_signals[SIGNAL_PUSH_BUFFER] = g_signal_new ("push-buffer", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass, push_buffer), NULL, NULL, __gst_app_marshal_ENUM__BOXED, GST_TYPE_FLOW_RETURN, 1, GST_TYPE_BUFFER); /** * GstAppSrc::end-of-stream: * @appsrc: the appsrc * * Notify @appsrc that no more buffer are available. */ gst_app_src_signals[SIGNAL_END_OF_STREAM] = g_signal_new ("end-of-stream", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (GstAppSrcClass, end_of_stream), NULL, NULL, __gst_app_marshal_ENUM__VOID, GST_TYPE_FLOW_RETURN, 0, G_TYPE_NONE); gst_element_class_set_details_simple (element_class, "AppSrc", "Generic/Source", "Allow the application to feed buffers to a pipeline", "David Schleef , Wim Taymans "); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_app_src_template)); basesrc_class->negotiate = gst_app_src_negotiate; basesrc_class->get_caps = gst_app_src_internal_get_caps; basesrc_class->create = gst_app_src_create; basesrc_class->start = gst_app_src_start; basesrc_class->stop = gst_app_src_stop; basesrc_class->unlock = gst_app_src_unlock; basesrc_class->unlock_stop = gst_app_src_unlock_stop; basesrc_class->do_seek = gst_app_src_do_seek; basesrc_class->is_seekable = gst_app_src_is_seekable; basesrc_class->get_size = gst_app_src_do_get_size; basesrc_class->get_size = gst_app_src_do_get_size; basesrc_class->query = gst_app_src_query; klass->push_buffer = gst_app_src_push_buffer_action; klass->end_of_stream = gst_app_src_end_of_stream; g_type_class_add_private (klass, sizeof (GstAppSrcPrivate)); } static void gst_app_src_init (GstAppSrc * appsrc) { GstAppSrcPrivate *priv; priv = appsrc->priv = G_TYPE_INSTANCE_GET_PRIVATE (appsrc, GST_TYPE_APP_SRC, GstAppSrcPrivate); priv->mutex = g_mutex_new (); priv->cond = g_cond_new (); priv->queue = g_queue_new (); priv->size = DEFAULT_PROP_SIZE; priv->stream_type = DEFAULT_PROP_STREAM_TYPE; priv->max_bytes = DEFAULT_PROP_MAX_BYTES; priv->format = DEFAULT_PROP_FORMAT; priv->block = DEFAULT_PROP_BLOCK; priv->min_latency = DEFAULT_PROP_MIN_LATENCY; priv->max_latency = DEFAULT_PROP_MAX_LATENCY; priv->emit_signals = DEFAULT_PROP_EMIT_SIGNALS; priv->min_percent = DEFAULT_PROP_MIN_PERCENT; gst_base_src_set_live (GST_BASE_SRC (appsrc), DEFAULT_PROP_IS_LIVE); } static void gst_app_src_flush_queued (GstAppSrc * src) { GstBuffer *buf; GstAppSrcPrivate *priv = src->priv; while ((buf = g_queue_pop_head (priv->queue))) gst_buffer_unref (buf); priv->queued_bytes = 0; } static void gst_app_src_dispose (GObject * obj) { GstAppSrc *appsrc = GST_APP_SRC_CAST (obj); GstAppSrcPrivate *priv = appsrc->priv; if (priv->caps) { gst_caps_unref (priv->caps); priv->caps = NULL; } gst_app_src_flush_queued (appsrc); G_OBJECT_CLASS (parent_class)->dispose (obj); } static void gst_app_src_finalize (GObject * obj) { GstAppSrc *appsrc = GST_APP_SRC_CAST (obj); GstAppSrcPrivate *priv = appsrc->priv; g_mutex_free (priv->mutex); g_cond_free (priv->cond); g_queue_free (priv->queue); g_free (priv->uri); G_OBJECT_CLASS (parent_class)->finalize (obj); } static GstCaps * gst_app_src_internal_get_caps (GstBaseSrc * bsrc, GstCaps * filter) { GstAppSrc *appsrc = GST_APP_SRC (bsrc); GstCaps *caps; GST_OBJECT_LOCK (appsrc); if ((caps = appsrc->priv->caps)) gst_caps_ref (caps); GST_OBJECT_UNLOCK (appsrc); if (filter) { if (caps) { GstCaps *intersection = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (caps); caps = intersection; } else { caps = gst_caps_ref (filter); } } GST_DEBUG_OBJECT (appsrc, "caps: %" GST_PTR_FORMAT, caps); return caps; } static void gst_app_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstAppSrc *appsrc = GST_APP_SRC_CAST (object); GstAppSrcPrivate *priv = appsrc->priv; switch (prop_id) { case PROP_CAPS: gst_app_src_set_caps (appsrc, gst_value_get_caps (value)); break; case PROP_SIZE: gst_app_src_set_size (appsrc, g_value_get_int64 (value)); break; case PROP_STREAM_TYPE: gst_app_src_set_stream_type (appsrc, g_value_get_enum (value)); break; case PROP_MAX_BYTES: gst_app_src_set_max_bytes (appsrc, g_value_get_uint64 (value)); break; case PROP_FORMAT: priv->format = g_value_get_enum (value); break; case PROP_BLOCK: priv->block = g_value_get_boolean (value); break; case PROP_IS_LIVE: gst_base_src_set_live (GST_BASE_SRC (appsrc), g_value_get_boolean (value)); break; case PROP_MIN_LATENCY: gst_app_src_set_latencies (appsrc, TRUE, g_value_get_int64 (value), FALSE, -1); break; case PROP_MAX_LATENCY: gst_app_src_set_latencies (appsrc, FALSE, -1, TRUE, g_value_get_int64 (value)); break; case PROP_EMIT_SIGNALS: gst_app_src_set_emit_signals (appsrc, g_value_get_boolean (value)); break; case PROP_MIN_PERCENT: priv->min_percent = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_app_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstAppSrc *appsrc = GST_APP_SRC_CAST (object); GstAppSrcPrivate *priv = appsrc->priv; switch (prop_id) { case PROP_CAPS: g_value_take_boxed (value, gst_app_src_get_caps (appsrc)); break; case PROP_SIZE: g_value_set_int64 (value, gst_app_src_get_size (appsrc)); break; case PROP_STREAM_TYPE: g_value_set_enum (value, gst_app_src_get_stream_type (appsrc)); break; case PROP_MAX_BYTES: g_value_set_uint64 (value, gst_app_src_get_max_bytes (appsrc)); break; case PROP_FORMAT: g_value_set_enum (value, priv->format); break; case PROP_BLOCK: g_value_set_boolean (value, priv->block); break; case PROP_IS_LIVE: g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (appsrc))); break; case PROP_MIN_LATENCY: { guint64 min; gst_app_src_get_latency (appsrc, &min, NULL); g_value_set_int64 (value, min); break; } case PROP_MAX_LATENCY: { guint64 max; gst_app_src_get_latency (appsrc, &max, NULL); g_value_set_int64 (value, max); break; } case PROP_EMIT_SIGNALS: g_value_set_boolean (value, gst_app_src_get_emit_signals (appsrc)); break; case PROP_MIN_PERCENT: g_value_set_uint (value, priv->min_percent); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_app_src_unlock (GstBaseSrc * bsrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc); GstAppSrcPrivate *priv = appsrc->priv; g_mutex_lock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "unlock start"); priv->flushing = TRUE; g_cond_broadcast (priv->cond); g_mutex_unlock (priv->mutex); return TRUE; } static gboolean gst_app_src_unlock_stop (GstBaseSrc * bsrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc); GstAppSrcPrivate *priv = appsrc->priv; g_mutex_lock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "unlock stop"); priv->flushing = FALSE; g_cond_broadcast (priv->cond); g_mutex_unlock (priv->mutex); return TRUE; } static gboolean gst_app_src_start (GstBaseSrc * bsrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc); GstAppSrcPrivate *priv = appsrc->priv; g_mutex_lock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "starting"); priv->new_caps = FALSE; priv->started = TRUE; /* set the offset to -1 so that we always do a first seek. This is only used * in random-access mode. */ priv->offset = -1; priv->flushing = FALSE; g_mutex_unlock (priv->mutex); gst_base_src_set_format (bsrc, priv->format); return TRUE; } static gboolean gst_app_src_stop (GstBaseSrc * bsrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc); GstAppSrcPrivate *priv = appsrc->priv; g_mutex_lock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "stopping"); priv->is_eos = FALSE; priv->flushing = TRUE; priv->started = FALSE; gst_app_src_flush_queued (appsrc); g_mutex_unlock (priv->mutex); return TRUE; } static gboolean gst_app_src_is_seekable (GstBaseSrc * src) { GstAppSrc *appsrc = GST_APP_SRC_CAST (src); GstAppSrcPrivate *priv = appsrc->priv; gboolean res = FALSE; switch (priv->stream_type) { case GST_APP_STREAM_TYPE_STREAM: break; case GST_APP_STREAM_TYPE_SEEKABLE: case GST_APP_STREAM_TYPE_RANDOM_ACCESS: res = TRUE; break; } return res; } static gboolean gst_app_src_do_get_size (GstBaseSrc * src, guint64 * size) { GstAppSrc *appsrc = GST_APP_SRC_CAST (src); *size = gst_app_src_get_size (appsrc); return TRUE; } static gboolean gst_app_src_query (GstBaseSrc * src, GstQuery * query) { GstAppSrc *appsrc = GST_APP_SRC_CAST (src); GstAppSrcPrivate *priv = appsrc->priv; gboolean res; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_LATENCY: { GstClockTime min, max; gboolean live; /* Query the parent class for the defaults */ res = gst_base_src_query_latency (src, &live, &min, &max); /* overwrite with our values when we need to */ g_mutex_lock (priv->mutex); if (priv->min_latency != -1) min = priv->min_latency; if (priv->max_latency != -1) max = priv->max_latency; g_mutex_unlock (priv->mutex); gst_query_set_latency (query, live, min, max); break; } case GST_QUERY_SCHEDULING: { gst_query_set_scheduling (query, GST_SCHEDULING_FLAG_SEEKABLE, 1, -1, 0); gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH); switch (priv->stream_type) { case GST_APP_STREAM_TYPE_STREAM: case GST_APP_STREAM_TYPE_SEEKABLE: break; case GST_APP_STREAM_TYPE_RANDOM_ACCESS: gst_query_add_scheduling_mode (query, GST_PAD_MODE_PULL); break; } res = TRUE; break; } default: res = GST_BASE_SRC_CLASS (parent_class)->query (src, query); break; } return res; } /* will be called in push mode */ static gboolean gst_app_src_do_seek (GstBaseSrc * src, GstSegment * segment) { GstAppSrc *appsrc = GST_APP_SRC_CAST (src); GstAppSrcPrivate *priv = appsrc->priv; gint64 desired_position; gboolean res = FALSE; desired_position = segment->position; GST_DEBUG_OBJECT (appsrc, "seeking to %" G_GINT64_FORMAT ", format %s", desired_position, gst_format_get_name (segment->format)); /* no need to try to seek in streaming mode */ if (priv->stream_type == GST_APP_STREAM_TYPE_STREAM) return TRUE; if (priv->callbacks.seek_data) res = priv->callbacks.seek_data (appsrc, desired_position, priv->user_data); else { gboolean emit; g_mutex_lock (priv->mutex); emit = priv->emit_signals; g_mutex_unlock (priv->mutex); if (emit) g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0, desired_position, &res); } if (res) { GST_DEBUG_OBJECT (appsrc, "flushing queue"); gst_app_src_flush_queued (appsrc); priv->is_eos = FALSE; } else { GST_WARNING_OBJECT (appsrc, "seek failed"); } return res; } /* must be called with the appsrc mutex */ static gboolean gst_app_src_emit_seek (GstAppSrc * appsrc, guint64 offset) { gboolean res = FALSE; gboolean emit; GstAppSrcPrivate *priv = appsrc->priv; emit = priv->emit_signals; g_mutex_unlock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "we are at %" G_GINT64_FORMAT ", seek to %" G_GINT64_FORMAT, priv->offset, offset); if (priv->callbacks.seek_data) res = priv->callbacks.seek_data (appsrc, offset, priv->user_data); else if (emit) g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_SEEK_DATA], 0, offset, &res); g_mutex_lock (priv->mutex); return res; } /* must be called with the appsrc mutex. After this call things can be * flushing */ static void gst_app_src_emit_need_data (GstAppSrc * appsrc, guint size) { gboolean emit; GstAppSrcPrivate *priv = appsrc->priv; emit = priv->emit_signals; g_mutex_unlock (priv->mutex); /* we have no data, we need some. We fire the signal with the size hint. */ if (priv->callbacks.need_data) priv->callbacks.need_data (appsrc, size, priv->user_data); else if (emit) g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_NEED_DATA], 0, size, NULL); g_mutex_lock (priv->mutex); /* we can be flushing now because we released the lock */ } static gboolean gst_app_src_do_negotiate (GstBaseSrc * basesrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (basesrc); GstAppSrcPrivate *priv = appsrc->priv; gboolean result; GstCaps *caps; GST_OBJECT_LOCK (basesrc); caps = priv->caps ? gst_caps_ref (priv->caps) : NULL; GST_OBJECT_UNLOCK (basesrc); if (caps) { result = gst_base_src_set_caps (basesrc, caps); gst_caps_unref (caps); } else { result = GST_BASE_SRC_CLASS (parent_class)->negotiate (basesrc); } return result; } static gboolean gst_app_src_negotiate (GstBaseSrc * basesrc) { GstAppSrc *appsrc = GST_APP_SRC_CAST (basesrc); GstAppSrcPrivate *priv = appsrc->priv; gboolean result; g_mutex_lock (priv->mutex); result = gst_app_src_do_negotiate (basesrc); priv->new_caps = FALSE; g_mutex_unlock (priv->mutex); return result; } static GstFlowReturn gst_app_src_create (GstBaseSrc * bsrc, guint64 offset, guint size, GstBuffer ** buf) { GstAppSrc *appsrc = GST_APP_SRC_CAST (bsrc); GstAppSrcPrivate *priv = appsrc->priv; GstFlowReturn ret; GST_OBJECT_LOCK (appsrc); if (G_UNLIKELY (priv->size != bsrc->segment.duration && bsrc->segment.format == GST_FORMAT_BYTES)) { GST_DEBUG_OBJECT (appsrc, "Size changed from %" G_GINT64_FORMAT " to %" G_GINT64_FORMAT, bsrc->segment.duration, priv->size); bsrc->segment.duration = priv->size; GST_OBJECT_UNLOCK (appsrc); gst_element_post_message (GST_ELEMENT (appsrc), gst_message_new_duration (GST_OBJECT (appsrc), GST_FORMAT_BYTES, priv->size)); } else { GST_OBJECT_UNLOCK (appsrc); } g_mutex_lock (priv->mutex); /* check flushing first */ if (G_UNLIKELY (priv->flushing)) goto flushing; if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) { /* if we are dealing with a random-access stream, issue a seek if the offset * changed. */ if (G_UNLIKELY (priv->offset != offset)) { gboolean res; /* do the seek */ res = gst_app_src_emit_seek (appsrc, offset); if (G_UNLIKELY (!res)) /* failing to seek is fatal */ goto seek_error; priv->offset = offset; priv->is_eos = FALSE; } } while (TRUE) { /* return data as long as we have some */ if (!g_queue_is_empty (priv->queue)) { guint buf_size; *buf = g_queue_pop_head (priv->queue); buf_size = gst_buffer_get_size (*buf); GST_DEBUG_OBJECT (appsrc, "we have buffer %p of size %u", *buf, buf_size); if (priv->new_caps) { gst_app_src_do_negotiate (bsrc); priv->new_caps = FALSE; } priv->queued_bytes -= buf_size; /* only update the offset when in random_access mode */ if (priv->stream_type == GST_APP_STREAM_TYPE_RANDOM_ACCESS) priv->offset += buf_size; /* signal that we removed an item */ g_cond_broadcast (priv->cond); /* see if we go lower than the empty-percent */ if (priv->min_percent && priv->max_bytes) { if (priv->queued_bytes * 100 / priv->max_bytes <= priv->min_percent) /* ignore flushing state, we got a buffer and we will return it now. * Errors will be handled in the next round */ gst_app_src_emit_need_data (appsrc, size); } ret = GST_FLOW_OK; break; } else { gst_app_src_emit_need_data (appsrc, size); /* we can be flushing now because we released the lock above */ if (G_UNLIKELY (priv->flushing)) goto flushing; /* if we have a buffer now, continue the loop and try to return it. In * random-access mode (where a buffer is normally pushed in the above * signal) we can still be empty because the pushed buffer got flushed or * when the application pushes the requested buffer later, we support both * possibilities. */ if (!g_queue_is_empty (priv->queue)) continue; /* no buffer yet, maybe we are EOS, if not, block for more data. */ } /* check EOS */ if (G_UNLIKELY (priv->is_eos)) goto eos; /* nothing to return, wait a while for new data or flushing. */ g_cond_wait (priv->cond, priv->mutex); } g_mutex_unlock (priv->mutex); return ret; /* ERRORS */ flushing: { GST_DEBUG_OBJECT (appsrc, "we are flushing"); g_mutex_unlock (priv->mutex); return GST_FLOW_FLUSHING; } eos: { GST_DEBUG_OBJECT (appsrc, "we are EOS"); g_mutex_unlock (priv->mutex); return GST_FLOW_EOS; } seek_error: { g_mutex_unlock (priv->mutex); GST_ELEMENT_ERROR (appsrc, RESOURCE, READ, ("failed to seek"), GST_ERROR_SYSTEM); return GST_FLOW_ERROR; } } /* external API */ /** * gst_app_src_set_caps: * @appsrc: a #GstAppSrc * @caps: caps to set * * Set the capabilities on the appsrc element. This function takes * a copy of the caps structure. After calling this method, the source will * only produce caps that match @caps. @caps must be fixed and the caps on the * buffers must match the caps or left NULL. */ void gst_app_src_set_caps (GstAppSrc * appsrc, const GstCaps * caps) { GstCaps *old; GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); GST_DEBUG_OBJECT (appsrc, "setting caps to %" GST_PTR_FORMAT, caps); if ((old = priv->caps) != caps) { if (caps) priv->caps = gst_caps_copy (caps); else priv->caps = NULL; if (old) gst_caps_unref (old); g_mutex_lock (priv->mutex); priv->new_caps = TRUE; g_mutex_unlock (priv->mutex); } GST_OBJECT_UNLOCK (appsrc); } /** * gst_app_src_get_caps: * @appsrc: a #GstAppSrc * * Get the configured caps on @appsrc. * * Returns: the #GstCaps produced by the source. gst_caps_unref() after usage. */ GstCaps * gst_app_src_get_caps (GstAppSrc * appsrc) { g_return_val_if_fail (GST_IS_APP_SRC (appsrc), NULL); return gst_app_src_internal_get_caps (GST_BASE_SRC_CAST (appsrc), NULL); } /** * gst_app_src_set_size: * @appsrc: a #GstAppSrc * @size: the size to set * * Set the size of the stream in bytes. A value of -1 means that the size is * not known. */ void gst_app_src_set_size (GstAppSrc * appsrc, gint64 size) { GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); GST_DEBUG_OBJECT (appsrc, "setting size of %" G_GINT64_FORMAT, size); priv->size = size; GST_OBJECT_UNLOCK (appsrc); } /** * gst_app_src_get_size: * @appsrc: a #GstAppSrc * * Get the size of the stream in bytes. A value of -1 means that the size is * not known. * * Returns: the size of the stream previously set with gst_app_src_set_size(); */ gint64 gst_app_src_get_size (GstAppSrc * appsrc) { gint64 size; GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), -1); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); size = priv->size; GST_DEBUG_OBJECT (appsrc, "getting size of %" G_GINT64_FORMAT, size); GST_OBJECT_UNLOCK (appsrc); return size; } /** * gst_app_src_set_stream_type: * @appsrc: a #GstAppSrc * @type: the new state * * Set the stream type on @appsrc. For seekable streams, the "seek" signal must * be connected to. * * A stream_type stream */ void gst_app_src_set_stream_type (GstAppSrc * appsrc, GstAppStreamType type) { GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); GST_DEBUG_OBJECT (appsrc, "setting stream_type of %d", type); priv->stream_type = type; GST_OBJECT_UNLOCK (appsrc); } /** * gst_app_src_get_stream_type: * @appsrc: a #GstAppSrc * * Get the stream type. Control the stream type of @appsrc * with gst_app_src_set_stream_type(). * * Returns: the stream type. */ GstAppStreamType gst_app_src_get_stream_type (GstAppSrc * appsrc) { gboolean stream_type; GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); stream_type = priv->stream_type; GST_DEBUG_OBJECT (appsrc, "getting stream_type of %d", stream_type); GST_OBJECT_UNLOCK (appsrc); return stream_type; } /** * gst_app_src_set_max_bytes: * @appsrc: a #GstAppSrc * @max: the maximum number of bytes to queue * * Set the maximum amount of bytes that can be queued in @appsrc. * After the maximum amount of bytes are queued, @appsrc will emit the * "enough-data" signal. */ void gst_app_src_set_max_bytes (GstAppSrc * appsrc, guint64 max) { GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; g_mutex_lock (priv->mutex); if (max != priv->max_bytes) { GST_DEBUG_OBJECT (appsrc, "setting max-bytes to %" G_GUINT64_FORMAT, max); priv->max_bytes = max; /* signal the change */ g_cond_broadcast (priv->cond); } g_mutex_unlock (priv->mutex); } /** * gst_app_src_get_max_bytes: * @appsrc: a #GstAppSrc * * Get the maximum amount of bytes that can be queued in @appsrc. * * Returns: The maximum amount of bytes that can be queued. */ guint64 gst_app_src_get_max_bytes (GstAppSrc * appsrc) { guint64 result; GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), 0); priv = appsrc->priv; g_mutex_lock (priv->mutex); result = priv->max_bytes; GST_DEBUG_OBJECT (appsrc, "getting max-bytes of %" G_GUINT64_FORMAT, result); g_mutex_unlock (priv->mutex); return result; } static void gst_app_src_set_latencies (GstAppSrc * appsrc, gboolean do_min, guint64 min, gboolean do_max, guint64 max) { GstAppSrcPrivate *priv = appsrc->priv; gboolean changed = FALSE; g_mutex_lock (priv->mutex); if (do_min && priv->min_latency != min) { priv->min_latency = min; changed = TRUE; } if (do_max && priv->max_latency != max) { priv->max_latency = max; changed = TRUE; } g_mutex_unlock (priv->mutex); if (changed) { GST_DEBUG_OBJECT (appsrc, "posting latency changed"); gst_element_post_message (GST_ELEMENT_CAST (appsrc), gst_message_new_latency (GST_OBJECT_CAST (appsrc))); } } /** * gst_app_src_set_latency: * @appsrc: a #GstAppSrc * @min: the min latency * @max: the min latency * * Configure the @min and @max latency in @src. If @min is set to -1, the * default latency calculations for pseudo-live sources will be used. */ void gst_app_src_set_latency (GstAppSrc * appsrc, guint64 min, guint64 max) { gst_app_src_set_latencies (appsrc, TRUE, min, TRUE, max); } /** * gst_app_src_get_latency: * @appsrc: a #GstAppSrc * @min: the min latency * @max: the min latency * * Retrieve the min and max latencies in @min and @max respectively. */ void gst_app_src_get_latency (GstAppSrc * appsrc, guint64 * min, guint64 * max) { GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; g_mutex_lock (priv->mutex); if (min) *min = priv->min_latency; if (max) *max = priv->max_latency; g_mutex_unlock (priv->mutex); } /** * gst_app_src_set_emit_signals: * @appsrc: a #GstAppSrc * @emit: the new state * * Make appsrc emit the "new-preroll" and "new-buffer" signals. This option is * by default disabled because signal emission is expensive and unneeded when * the application prefers to operate in pull mode. */ void gst_app_src_set_emit_signals (GstAppSrc * appsrc, gboolean emit) { GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); priv = appsrc->priv; g_mutex_lock (priv->mutex); priv->emit_signals = emit; g_mutex_unlock (priv->mutex); } /** * gst_app_src_get_emit_signals: * @appsrc: a #GstAppSrc * * Check if appsrc will emit the "new-preroll" and "new-buffer" signals. * * Returns: %TRUE if @appsrc is emitting the "new-preroll" and "new-buffer" * signals. */ gboolean gst_app_src_get_emit_signals (GstAppSrc * appsrc) { gboolean result; GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), FALSE); priv = appsrc->priv; g_mutex_lock (priv->mutex); result = priv->emit_signals; g_mutex_unlock (priv->mutex); return result; } static GstFlowReturn gst_app_src_push_buffer_full (GstAppSrc * appsrc, GstBuffer * buffer, gboolean steal_ref) { gboolean first = TRUE; GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR); g_return_val_if_fail (GST_IS_BUFFER (buffer), GST_FLOW_ERROR); priv = appsrc->priv; g_mutex_lock (priv->mutex); while (TRUE) { /* can't accept buffers when we are flushing or EOS */ if (priv->flushing) goto flushing; if (priv->is_eos) goto eos; if (priv->max_bytes && priv->queued_bytes >= priv->max_bytes) { GST_DEBUG_OBJECT (appsrc, "queue filled (%" G_GUINT64_FORMAT " >= %" G_GUINT64_FORMAT ")", priv->queued_bytes, priv->max_bytes); if (first) { gboolean emit; emit = priv->emit_signals; /* only signal on the first push */ g_mutex_unlock (priv->mutex); if (priv->callbacks.enough_data) priv->callbacks.enough_data (appsrc, priv->user_data); else if (emit) g_signal_emit (appsrc, gst_app_src_signals[SIGNAL_ENOUGH_DATA], 0, NULL); g_mutex_lock (priv->mutex); /* continue to check for flushing/eos after releasing the lock */ first = FALSE; continue; } if (priv->block) { GST_DEBUG_OBJECT (appsrc, "waiting for free space"); /* we are filled, wait until a buffer gets popped or when we * flush. */ g_cond_wait (priv->cond, priv->mutex); } else { /* no need to wait for free space, we just pump more data into the * queue hoping that the caller reacts to the enough-data signal and * stops pushing buffers. */ break; } } else break; } GST_DEBUG_OBJECT (appsrc, "queueing buffer %p", buffer); if (!steal_ref) gst_buffer_ref (buffer); g_queue_push_tail (priv->queue, buffer); priv->queued_bytes += gst_buffer_get_size (buffer); g_cond_broadcast (priv->cond); g_mutex_unlock (priv->mutex); return GST_FLOW_OK; /* ERRORS */ flushing: { GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are flushing", buffer); if (steal_ref) gst_buffer_unref (buffer); g_mutex_unlock (priv->mutex); return GST_FLOW_FLUSHING; } eos: { GST_DEBUG_OBJECT (appsrc, "refuse buffer %p, we are EOS", buffer); if (steal_ref) gst_buffer_unref (buffer); g_mutex_unlock (priv->mutex); return GST_FLOW_EOS; } } /** * gst_app_src_push_buffer: * @appsrc: a #GstAppSrc * @buffer: a #GstBuffer to push * * Adds a buffer to the queue of buffers that the appsrc element will * push to its source pad. This function takes ownership of the buffer. * * When the block property is TRUE, this function can block until free * space becomes available in the queue. * * Returns: #GST_FLOW_OK when the buffer was successfuly queued. * #GST_FLOW_FLUSHING when @appsrc is not PAUSED or PLAYING. * #GST_FLOW_EOS when EOS occured. */ GstFlowReturn gst_app_src_push_buffer (GstAppSrc * appsrc, GstBuffer * buffer) { return gst_app_src_push_buffer_full (appsrc, buffer, TRUE); } /* push a buffer without stealing the ref of the buffer. This is used for the * action signal. */ static GstFlowReturn gst_app_src_push_buffer_action (GstAppSrc * appsrc, GstBuffer * buffer) { return gst_app_src_push_buffer_full (appsrc, buffer, FALSE); } /** * gst_app_src_end_of_stream: * @appsrc: a #GstAppSrc * * Indicates to the appsrc element that the last buffer queued in the * element is the last buffer of the stream. * * Returns: #GST_FLOW_OK when the EOS was successfuly queued. * #GST_FLOW_FLUSHING when @appsrc is not PAUSED or PLAYING. */ GstFlowReturn gst_app_src_end_of_stream (GstAppSrc * appsrc) { GstAppSrcPrivate *priv; g_return_val_if_fail (GST_IS_APP_SRC (appsrc), GST_FLOW_ERROR); priv = appsrc->priv; g_mutex_lock (priv->mutex); /* can't accept buffers when we are flushing. We can accept them when we are * EOS although it will not do anything. */ if (priv->flushing) goto flushing; GST_DEBUG_OBJECT (appsrc, "sending EOS"); priv->is_eos = TRUE; g_cond_broadcast (priv->cond); g_mutex_unlock (priv->mutex); return GST_FLOW_OK; /* ERRORS */ flushing: { g_mutex_unlock (priv->mutex); GST_DEBUG_OBJECT (appsrc, "refuse EOS, we are flushing"); return GST_FLOW_FLUSHING; } } /** * gst_app_src_set_callbacks: (skip) * @appsrc: a #GstAppSrc * @callbacks: the callbacks * @user_data: a user_data argument for the callbacks * @notify: a destroy notify function * * Set callbacks which will be executed when data is needed, enough data has * been collected or when a seek should be performed. * This is an alternative to using the signals, it has lower overhead and is thus * less expensive, but also less flexible. * * If callbacks are installed, no signals will be emitted for performance * reasons. */ void gst_app_src_set_callbacks (GstAppSrc * appsrc, GstAppSrcCallbacks * callbacks, gpointer user_data, GDestroyNotify notify) { GDestroyNotify old_notify; GstAppSrcPrivate *priv; g_return_if_fail (GST_IS_APP_SRC (appsrc)); g_return_if_fail (callbacks != NULL); priv = appsrc->priv; GST_OBJECT_LOCK (appsrc); old_notify = priv->notify; if (old_notify) { gpointer old_data; old_data = priv->user_data; priv->user_data = NULL; priv->notify = NULL; GST_OBJECT_UNLOCK (appsrc); old_notify (old_data); GST_OBJECT_LOCK (appsrc); } priv->callbacks = *callbacks; priv->user_data = user_data; priv->notify = notify; GST_OBJECT_UNLOCK (appsrc); } /*** GSTURIHANDLER INTERFACE *************************************************/ static GstURIType gst_app_src_uri_get_type (GType type) { return GST_URI_SRC; } static const gchar *const * gst_app_src_uri_get_protocols (GType type) { static const gchar *protocols[] = { "appsrc", NULL }; return protocols; } static gchar * gst_app_src_uri_get_uri (GstURIHandler * handler) { GstAppSrc *appsrc = GST_APP_SRC (handler); return appsrc->priv->uri ? g_strdup (appsrc->priv->uri) : NULL; } static gboolean gst_app_src_uri_set_uri (GstURIHandler * handler, const gchar * uri, GError ** error) { GstAppSrc *appsrc = GST_APP_SRC (handler); g_free (appsrc->priv->uri); appsrc->priv->uri = uri ? g_strdup (uri) : NULL; return TRUE; } static void gst_app_src_uri_handler_init (gpointer g_iface, gpointer iface_data) { GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface; iface->get_type = gst_app_src_uri_get_type; iface->get_protocols = gst_app_src_uri_get_protocols; iface->get_uri = gst_app_src_uri_get_uri; iface->set_uri = gst_app_src_uri_set_uri; }