--- /dev/null
+#include <gst/gst.h>
+#include <string.h>
+
+#define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */
+#define SAMPLE_RATE 44100 /* Samples per second we are sending */
+#define AUDIO_CAPS "audio/x-raw-int,channels=1,rate=%d,signed=(boolean)true,width=16,depth=16,endianness=BYTE_ORDER"
+
+/* Structure to contain all our information, so we can pass it to callbacks */
+typedef struct _CustomData {
+ GstElement *pipeline;
+ GstElement *app_source;
+
+ guint64 num_samples; /* Number of samples generated so far (for timestamp generation) */
+ gfloat a, b, c, d; /* For waveform generation */
+
+ guint sourceid; /* To control the GSource */
+
+ GMainLoop *main_loop; /* GLib's Main Loop */
+} CustomData;
+
+/* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc.
+ * The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
+ * and is removed when appsrc has enough data (enough-data signal).
+ */
+static gboolean push_data (CustomData *data) {
+ GstBuffer *buffer;
+ GstFlowReturn ret;
+ int i;
+ gint16 *raw;
+ gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */
+ gfloat freq;
+
+ /* Create a new empty buffer */
+ buffer = gst_buffer_new_and_alloc (CHUNK_SIZE);
+
+ /* Set its timestamp and duration */
+ GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale (data->num_samples, GST_SECOND, SAMPLE_RATE);
+ GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale (CHUNK_SIZE, GST_SECOND, SAMPLE_RATE);
+
+ /* Generate some psychodelic waveforms */
+ raw = (gint16 *)GST_BUFFER_DATA (buffer);
+ data->c += data->d;
+ data->d -= data->c / 1000;
+ freq = 1100 + 1000 * data->d;
+ for (i = 0; i < num_samples; i++) {
+ data->a += data->b;
+ data->b -= data->a / freq;
+ raw[i] = (gint16)(500 * data->a);
+ }
+ data->num_samples += num_samples;
+
+ /* Push the buffer into the appsrc */
+ g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret);
+
+ /* Free the buffer now that we are done with it */
+ gst_buffer_unref (buffer);
+
+ if (ret != GST_FLOW_OK) {
+ /* We got some error, stop sending data */
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/* This signal callback triggers when appsrc needs data. Here, we add an idle handler
+ * to the mainloop to start pushing data into the appsrc */
+static void start_feed (GstElement *source, guint size, CustomData *data) {
+ if (data->sourceid == 0) {
+ g_print ("Start feeding\n");
+ data->sourceid = g_idle_add ((GSourceFunc) push_data, data);
+ }
+}
+
+/* This callback triggers when appsrc has enough data and we can stop sending.
+ * We remove the idle handler from the mainloop */
+static void stop_feed (GstElement *source, CustomData *data) {
+ if (data->sourceid != 0) {
+ g_print ("Stop feeding\n");
+ g_source_remove (data->sourceid);
+ data->sourceid = 0;
+ }
+}
+
+/* This function is called when an error message is posted on the bus */
+static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
+ GError *err;
+ gchar *debug_info;
+
+ /* Print error details on the screen */
+ gst_message_parse_error (msg, &err, &debug_info);
+ g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
+ g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
+ g_clear_error (&err);
+ g_free (debug_info);
+
+ g_main_loop_quit (data->main_loop);
+}
+
+/* This function is called when playbin2 has created the appsrc element, so we have
+ * a chance to configure it. */
+static void source_setup (GstElement *pipeline, GstElement *source, CustomData *data) {
+ gchar *audio_caps_text;
+ GstCaps *audio_caps;
+
+ g_print ("Source has been created. Configuring.\n");
+ data->app_source = source;
+
+ /* Configure appsrc */
+ audio_caps_text = g_strdup_printf (AUDIO_CAPS, SAMPLE_RATE);
+ audio_caps = gst_caps_from_string (audio_caps_text);
+ g_object_set (source, "caps", audio_caps, NULL);
+ g_signal_connect (source, "need-data", G_CALLBACK (start_feed), data);
+ g_signal_connect (source, "enough-data", G_CALLBACK (stop_feed), data);
+ gst_caps_unref (audio_caps);
+ g_free (audio_caps_text);
+}
+
+int main(int argc, char *argv[]) {
+ CustomData data;
+ GstBus *bus;
+ guint flags;
+
+ /* Initialize cumstom data structure */
+ memset (&data, 0, sizeof (data));
+ data.b = 1; /* For waveform generation */
+ data.d = 1;
+
+ /* Initialize GStreamer */
+ gst_init (&argc, &argv);
+
+ /* Create the playbin2 element */
+ data.pipeline = gst_parse_launch ("playbin2 uri=appsrc://", NULL);
+ g_signal_connect (data.pipeline, "source-setup", G_CALLBACK (source_setup), &data);
+
+ /* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
+ bus = gst_element_get_bus (data.pipeline);
+ gst_bus_add_signal_watch (bus);
+ g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
+ gst_object_unref (bus);
+
+ /* Start playing the pipeline */
+ gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
+
+ /* Create a GLib Main Loop and set it to run */
+ data.main_loop = g_main_loop_new (NULL, FALSE);
+ g_main_loop_run (data.main_loop);
+
+ /* Free resources */
+ gst_element_set_state (data.pipeline, GST_STATE_NULL);
+ gst_object_unref (data.pipeline);
+ return 0;
+}
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>\r
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">\r
+ <ItemGroup Label="ProjectConfigurations">\r
+ <ProjectConfiguration Include="Debug|Win32">\r
+ <Configuration>Debug</Configuration>\r
+ <Platform>Win32</Platform>\r
+ </ProjectConfiguration>\r
+ <ProjectConfiguration Include="Debug|x64">\r
+ <Configuration>Debug</Configuration>\r
+ <Platform>x64</Platform>\r
+ </ProjectConfiguration>\r
+ <ProjectConfiguration Include="Release|Win32">\r
+ <Configuration>Release</Configuration>\r
+ <Platform>Win32</Platform>\r
+ </ProjectConfiguration>\r
+ <ProjectConfiguration Include="Release|x64">\r
+ <Configuration>Release</Configuration>\r
+ <Platform>x64</Platform>\r
+ </ProjectConfiguration>\r
+ </ItemGroup>\r
+ <ItemGroup>\r
+ <ClCompile Include="..\..\playback-tutorial-3.c" />\r
+ </ItemGroup>\r
+ <PropertyGroup Label="Globals">\r
+ <Keyword>Win32Proj</Keyword>\r
+ <ProjectGuid>{B84F4F87-E804-456C-874E-AC76E0116268}</ProjectGuid>\r
+ <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>\r
+ </PropertyGroup>\r
+ <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />\r
+ <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">\r
+ <ConfigurationType>Application</ConfigurationType>\r
+ <UseDebugLibraries>true</UseDebugLibraries>\r
+ <CharacterSet>Unicode</CharacterSet>\r
+ </PropertyGroup>\r
+ <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">\r
+ <ConfigurationType>Application</ConfigurationType>\r
+ <UseDebugLibraries>false</UseDebugLibraries>\r
+ <WholeProgramOptimization>true</WholeProgramOptimization>\r
+ <CharacterSet>Unicode</CharacterSet>\r
+ </PropertyGroup>\r
+ <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />\r
+ <ImportGroup Label="ExtensionSettings">\r
+ </ImportGroup>\r
+ <ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='Win32'">\r
+ <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />\r
+ <Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props')" />\r
+ <Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props')" />\r
+ </ImportGroup>\r
+ <ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='x64'">\r
+ <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />\r
+ <Import Project="$(GSTREAMER_SDK_ROOT_X86_64)\share\vs\2010\libs\gstreamer-0.10.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86_64)\share\vs\2010\libs\gstreamer-0.10.props')" />\r
+ <Import Project="$(GSTREAMER_SDK_ROOT_X86_64)\share\vs\2010\msvc\x86_64.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86_64)\share\vs\2010\msvc\x86_64.props')" />\r
+ </ImportGroup>\r
+ <PropertyGroup Label="UserMacros" />\r
+ <PropertyGroup Condition="'$(Configuration)'=='Debug'">\r
+ <LinkIncremental>true</LinkIncremental>\r
+ </PropertyGroup>\r
+ <PropertyGroup Condition="'$(Configuration)'=='Release'">\r
+ <LinkIncremental>false</LinkIncremental>\r
+ </PropertyGroup>\r
+ <ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">\r
+ <ClCompile>\r
+ <PrecompiledHeader>\r
+ </PrecompiledHeader>\r
+ <WarningLevel>Level3</WarningLevel>\r
+ <Optimization>Disabled</Optimization>\r
+ <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>\r
+ </ClCompile>\r
+ <Link>\r
+ <SubSystem>Console</SubSystem>\r
+ <GenerateDebugInformation>true</GenerateDebugInformation>\r
+ <AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>\r
+ <AdditionalLibraryDirectories>%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>\r
+ </Link>\r
+ </ItemDefinitionGroup>\r
+ <ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">\r
+ <ClCompile>\r
+ <WarningLevel>Level3</WarningLevel>\r
+ <PrecompiledHeader>\r
+ </PrecompiledHeader>\r
+ <Optimization>MaxSpeed</Optimization>\r
+ <FunctionLevelLinking>true</FunctionLevelLinking>\r
+ <IntrinsicFunctions>true</IntrinsicFunctions>\r
+ <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>\r
+ </ClCompile>\r
+ <Link>\r
+ <SubSystem>Console</SubSystem>\r
+ <GenerateDebugInformation>false</GenerateDebugInformation>\r
+ <EnableCOMDATFolding>true</EnableCOMDATFolding>\r
+ </Link>\r
+ </ItemDefinitionGroup>\r
+ <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />\r
+ <ImportGroup Label="ExtensionTargets">\r
+ </ImportGroup>\r
+</Project>
\ No newline at end of file
projects / platform / upstream / gstreamer.git / commitdiff