| /* GStreamer |
| * Copyright (C) 2010 David Schleef <ds@schleef.org> |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| /** |
| * SECTION:element-gstchopmydata |
| * |
| * The chopmydata element takes an incoming stream and chops it up |
| * into randomly sized buffers. Size of outgoing buffers are determined |
| * by the max-size, min-size, and step-size properties. |
| * |
| * <refsect2> |
| * <title>Example launch line</title> |
| * |[ |
| * gst-launch -v audiotestsrc num-buffers=10 ! gstchopmydata min-size=100 |
| * max-size=200 step-size=2 ! fakesink -v |
| * ]| |
| * |
| * This pipeline will create 10 buffers that are by default 2048 bytes |
| * each (1024 samples each), and chop them up into buffers that range |
| * in size from 100 bytes to 200 bytes, with the restriction that sizes |
| * are a multiple of 2. This restriction is important, because the |
| * default sample size for audiotestsrc is 2 bytes (one channel, 16-bit |
| * audio). |
| * |
| * </refsect2> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <gst/gst.h> |
| #include <gst/gst.h> |
| #include "gstchopmydata.h" |
| |
| /* prototypes */ |
| |
| |
| static void gst_chop_my_data_set_property (GObject * object, |
| guint property_id, const GValue * value, GParamSpec * pspec); |
| static void gst_chop_my_data_get_property (GObject * object, |
| guint property_id, GValue * value, GParamSpec * pspec); |
| |
| static GstStateChangeReturn |
| gst_chop_my_data_change_state (GstElement * element, GstStateChange transition); |
| |
| static GstFlowReturn gst_chop_my_data_chain (GstPad * pad, GstObject * parent, |
| GstBuffer * buffer); |
| static gboolean gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent, |
| GstEvent * event); |
| static gboolean gst_chop_my_data_src_event (GstPad * pad, GstObject * parent, |
| GstEvent * event); |
| |
| #define DEFAULT_MAX_SIZE 4096 |
| #define DEFAULT_MIN_SIZE 1 |
| #define DEFAULT_STEP_SIZE 1 |
| |
| enum |
| { |
| PROP_0, |
| PROP_MAX_SIZE, |
| PROP_MIN_SIZE, |
| PROP_STEP_SIZE |
| }; |
| |
| /* pad templates */ |
| |
| static GstStaticPadTemplate gst_chop_my_data_sink_template = |
| GST_STATIC_PAD_TEMPLATE ("sink", |
| GST_PAD_SINK, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| static GstStaticPadTemplate gst_chop_my_data_src_template = |
| GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| /* class initialization */ |
| |
| #define gst_chop_my_data_parent_class parent_class |
| G_DEFINE_TYPE (GstChopMyData, gst_chop_my_data, GST_TYPE_ELEMENT); |
| |
| static void |
| gst_chop_my_data_class_init (GstChopMyDataClass * klass) |
| { |
| GObjectClass *gobject_class = G_OBJECT_CLASS (klass); |
| GstElementClass *element_class = GST_ELEMENT_CLASS (klass); |
| |
| gobject_class->set_property = gst_chop_my_data_set_property; |
| gobject_class->get_property = gst_chop_my_data_get_property; |
| element_class->change_state = |
| GST_DEBUG_FUNCPTR (gst_chop_my_data_change_state); |
| |
| g_object_class_install_property (gobject_class, PROP_MAX_SIZE, |
| g_param_spec_int ("max-size", "max-size", |
| "Maximum size of outgoing buffers", 1, G_MAXINT, |
| DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| g_object_class_install_property (gobject_class, PROP_MIN_SIZE, |
| g_param_spec_int ("min-size", "max-size", |
| "Minimum size of outgoing buffers", 1, G_MAXINT, |
| DEFAULT_MIN_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| g_object_class_install_property (gobject_class, PROP_STEP_SIZE, |
| g_param_spec_int ("step-size", "step-size", |
| "Step increment for random buffer sizes", 1, G_MAXINT, |
| DEFAULT_MAX_SIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&gst_chop_my_data_src_template)); |
| gst_element_class_add_pad_template (element_class, |
| gst_static_pad_template_get (&gst_chop_my_data_sink_template)); |
| |
| gst_element_class_set_static_metadata (element_class, "FIXME", |
| "Generic", "FIXME", "David Schleef <ds@schleef.org>"); |
| } |
| |
| static void |
| gst_chop_my_data_init (GstChopMyData * chopmydata) |
| { |
| |
| chopmydata->sinkpad = |
| gst_pad_new_from_static_template (&gst_chop_my_data_sink_template, |
| "sink"); |
| gst_pad_set_event_function (chopmydata->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_chop_my_data_sink_event)); |
| gst_pad_set_chain_function (chopmydata->sinkpad, |
| GST_DEBUG_FUNCPTR (gst_chop_my_data_chain)); |
| GST_PAD_SET_PROXY_CAPS (chopmydata->sinkpad); |
| gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->sinkpad); |
| |
| chopmydata->srcpad = |
| gst_pad_new_from_static_template (&gst_chop_my_data_src_template, "src"); |
| gst_pad_set_event_function (chopmydata->srcpad, |
| GST_DEBUG_FUNCPTR (gst_chop_my_data_src_event)); |
| GST_PAD_SET_PROXY_CAPS (chopmydata->srcpad); |
| gst_element_add_pad (GST_ELEMENT (chopmydata), chopmydata->srcpad); |
| |
| chopmydata->step_size = DEFAULT_STEP_SIZE; |
| chopmydata->min_size = DEFAULT_MIN_SIZE; |
| chopmydata->max_size = DEFAULT_MAX_SIZE; |
| } |
| |
| void |
| gst_chop_my_data_set_property (GObject * object, guint property_id, |
| const GValue * value, GParamSpec * pspec) |
| { |
| GstChopMyData *chopmydata; |
| |
| g_return_if_fail (GST_IS_CHOP_MY_DATA (object)); |
| chopmydata = GST_CHOP_MY_DATA (object); |
| |
| switch (property_id) { |
| case PROP_MAX_SIZE: |
| chopmydata->max_size = g_value_get_int (value); |
| break; |
| case PROP_MIN_SIZE: |
| chopmydata->min_size = g_value_get_int (value); |
| break; |
| case PROP_STEP_SIZE: |
| chopmydata->step_size = g_value_get_int (value); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); |
| break; |
| } |
| } |
| |
| void |
| gst_chop_my_data_get_property (GObject * object, guint property_id, |
| GValue * value, GParamSpec * pspec) |
| { |
| GstChopMyData *chopmydata; |
| |
| g_return_if_fail (GST_IS_CHOP_MY_DATA (object)); |
| chopmydata = GST_CHOP_MY_DATA (object); |
| |
| switch (property_id) { |
| case PROP_MAX_SIZE: |
| g_value_set_int (value, chopmydata->max_size); |
| break; |
| case PROP_MIN_SIZE: |
| g_value_set_int (value, chopmydata->min_size); |
| break; |
| case PROP_STEP_SIZE: |
| g_value_set_int (value, chopmydata->step_size); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); |
| break; |
| } |
| } |
| |
| static GstStateChangeReturn |
| gst_chop_my_data_change_state (GstElement * element, GstStateChange transition) |
| { |
| GstChopMyData *chopmydata; |
| GstStateChangeReturn ret; |
| |
| chopmydata = GST_CHOP_MY_DATA (element); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_NULL_TO_READY: |
| break; |
| case GST_STATE_CHANGE_READY_TO_PAUSED: |
| GST_OBJECT_LOCK (chopmydata); |
| chopmydata->adapter = gst_adapter_new (); |
| chopmydata->rand = g_rand_new (); |
| chopmydata->next_size = 0; |
| GST_OBJECT_UNLOCK (chopmydata); |
| break; |
| case GST_STATE_CHANGE_PAUSED_TO_PLAYING: |
| break; |
| default: |
| break; |
| } |
| |
| ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_PLAYING_TO_PAUSED: |
| break; |
| case GST_STATE_CHANGE_PAUSED_TO_READY: |
| GST_OBJECT_LOCK (chopmydata); |
| g_object_unref (chopmydata->adapter); |
| chopmydata->adapter = NULL; |
| g_rand_free (chopmydata->rand); |
| GST_OBJECT_UNLOCK (chopmydata); |
| break; |
| case GST_STATE_CHANGE_READY_TO_NULL: |
| break; |
| default: |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static void |
| get_next_size (GstChopMyData * chopmydata) |
| { |
| int begin; |
| int end; |
| |
| begin = (chopmydata->min_size + chopmydata->step_size - 1) / |
| chopmydata->step_size; |
| end = (chopmydata->max_size + chopmydata->step_size) / chopmydata->step_size; |
| |
| if (begin >= end) { |
| chopmydata->next_size = begin * chopmydata->step_size; |
| return; |
| } |
| |
| chopmydata->next_size = |
| g_rand_int_range (chopmydata->rand, begin, end) * chopmydata->step_size; |
| } |
| |
| static GstFlowReturn |
| gst_chop_my_data_process (GstChopMyData * chopmydata, gboolean flush) |
| { |
| GstFlowReturn ret = GST_FLOW_OK; |
| GstBuffer *buffer; |
| |
| if (chopmydata->next_size == 0) { |
| get_next_size (chopmydata); |
| } |
| |
| while (gst_adapter_available (chopmydata->adapter) >= chopmydata->next_size) { |
| buffer = |
| gst_adapter_take_buffer (chopmydata->adapter, chopmydata->next_size); |
| |
| GST_BUFFER_PTS (buffer) = gst_adapter_prev_pts (chopmydata->adapter, NULL); |
| GST_BUFFER_DTS (buffer) = gst_adapter_prev_dts (chopmydata->adapter, NULL); |
| |
| chopmydata->next_size = 0; |
| |
| ret = gst_pad_push (chopmydata->srcpad, buffer); |
| if (ret != GST_FLOW_OK) { |
| return ret; |
| } |
| |
| get_next_size (chopmydata); |
| } |
| |
| if (flush) { |
| guint min_size = chopmydata->min_size; |
| |
| while (gst_adapter_available (chopmydata->adapter) >= min_size) { |
| buffer = gst_adapter_take_buffer (chopmydata->adapter, min_size); |
| ret = gst_pad_push (chopmydata->srcpad, buffer); |
| if (ret != GST_FLOW_OK) |
| break; |
| } |
| gst_adapter_clear (chopmydata->adapter); |
| } |
| |
| return ret; |
| } |
| |
| static GstFlowReturn |
| gst_chop_my_data_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) |
| { |
| GstChopMyData *chopmydata; |
| GstFlowReturn ret; |
| |
| chopmydata = GST_CHOP_MY_DATA (parent); |
| |
| GST_DEBUG_OBJECT (chopmydata, "chain"); |
| |
| gst_adapter_push (chopmydata->adapter, buffer); |
| ret = gst_chop_my_data_process (chopmydata, FALSE); |
| |
| return ret; |
| } |
| |
| static gboolean |
| gst_chop_my_data_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) |
| { |
| gboolean res; |
| GstChopMyData *chopmydata; |
| |
| chopmydata = GST_CHOP_MY_DATA (parent); |
| |
| GST_DEBUG_OBJECT (chopmydata, "event"); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_FLUSH_START: |
| res = gst_pad_push_event (chopmydata->srcpad, event); |
| break; |
| case GST_EVENT_FLUSH_STOP: |
| gst_adapter_clear (chopmydata->adapter); |
| res = gst_pad_push_event (chopmydata->srcpad, event); |
| break; |
| case GST_EVENT_SEGMENT: |
| res = gst_pad_push_event (chopmydata->srcpad, event); |
| break; |
| case GST_EVENT_EOS: |
| gst_chop_my_data_process (chopmydata, TRUE); |
| res = gst_pad_push_event (chopmydata->srcpad, event); |
| break; |
| default: |
| res = gst_pad_push_event (chopmydata->srcpad, event); |
| break; |
| } |
| |
| return res; |
| } |
| |
| static gboolean |
| gst_chop_my_data_src_event (GstPad * pad, GstObject * parent, GstEvent * event) |
| { |
| gboolean res; |
| GstChopMyData *chopmydata; |
| |
| chopmydata = GST_CHOP_MY_DATA (parent); |
| |
| GST_DEBUG_OBJECT (chopmydata, "event"); |
| |
| switch (GST_EVENT_TYPE (event)) { |
| case GST_EVENT_SEEK: |
| res = gst_pad_push_event (chopmydata->sinkpad, event); |
| break; |
| default: |
| res = gst_pad_push_event (chopmydata->sinkpad, event); |
| break; |
| } |
| |
| return res; |
| } |