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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Added playback tutorial 3
This commit is contained in:
Xavi Artigas
parent
80d6b6e476
commit
482bff1ce4
4 changed files with 264 additions and 0 deletions
153
gst-sdk/tutorials/playback-tutorial-3.c
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153
gst-sdk/tutorials/playback-tutorial-3.c
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#include <gst/gst.h>
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#include <string.h>
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#define CHUNK_SIZE 1024 /* Amount of bytes we are sending in each buffer */
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#define SAMPLE_RATE 44100 /* Samples per second we are sending */
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#define AUDIO_CAPS "audio/x-raw-int,channels=1,rate=%d,signed=(boolean)true,width=16,depth=16,endianness=BYTE_ORDER"
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/* Structure to contain all our information, so we can pass it to callbacks */
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typedef struct _CustomData {
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GstElement *pipeline;
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GstElement *app_source;
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guint64 num_samples; /* Number of samples generated so far (for timestamp generation) */
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gfloat a, b, c, d; /* For waveform generation */
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guint sourceid; /* To control the GSource */
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GMainLoop *main_loop; /* GLib's Main Loop */
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} CustomData;
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/* This method is called by the idle GSource in the mainloop, to feed CHUNK_SIZE bytes into appsrc.
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* The ide handler is added to the mainloop when appsrc requests us to start sending data (need-data signal)
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* and is removed when appsrc has enough data (enough-data signal).
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*/
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static gboolean push_data (CustomData *data) {
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GstBuffer *buffer;
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GstFlowReturn ret;
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int i;
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gint16 *raw;
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gint num_samples = CHUNK_SIZE / 2; /* Because each sample is 16 bits */
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gfloat freq;
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/* Create a new empty buffer */
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buffer = gst_buffer_new_and_alloc (CHUNK_SIZE);
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/* Set its timestamp and duration */
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GST_BUFFER_TIMESTAMP (buffer) = gst_util_uint64_scale (data->num_samples, GST_SECOND, SAMPLE_RATE);
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GST_BUFFER_DURATION (buffer) = gst_util_uint64_scale (CHUNK_SIZE, GST_SECOND, SAMPLE_RATE);
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/* Generate some psychodelic waveforms */
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raw = (gint16 *)GST_BUFFER_DATA (buffer);
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data->c += data->d;
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data->d -= data->c / 1000;
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freq = 1100 + 1000 * data->d;
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for (i = 0; i < num_samples; i++) {
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data->a += data->b;
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data->b -= data->a / freq;
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raw[i] = (gint16)(500 * data->a);
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}
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data->num_samples += num_samples;
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/* Push the buffer into the appsrc */
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g_signal_emit_by_name (data->app_source, "push-buffer", buffer, &ret);
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/* Free the buffer now that we are done with it */
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gst_buffer_unref (buffer);
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if (ret != GST_FLOW_OK) {
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/* We got some error, stop sending data */
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return FALSE;
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}
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return TRUE;
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}
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/* This signal callback triggers when appsrc needs data. Here, we add an idle handler
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* to the mainloop to start pushing data into the appsrc */
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static void start_feed (GstElement *source, guint size, CustomData *data) {
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if (data->sourceid == 0) {
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g_print ("Start feeding\n");
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data->sourceid = g_idle_add ((GSourceFunc) push_data, data);
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}
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}
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/* This callback triggers when appsrc has enough data and we can stop sending.
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* We remove the idle handler from the mainloop */
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static void stop_feed (GstElement *source, CustomData *data) {
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if (data->sourceid != 0) {
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g_print ("Stop feeding\n");
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g_source_remove (data->sourceid);
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data->sourceid = 0;
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}
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}
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/* This function is called when an error message is posted on the bus */
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static void error_cb (GstBus *bus, GstMessage *msg, CustomData *data) {
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GError *err;
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gchar *debug_info;
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/* Print error details on the screen */
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gst_message_parse_error (msg, &err, &debug_info);
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g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
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g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
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g_clear_error (&err);
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g_free (debug_info);
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g_main_loop_quit (data->main_loop);
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}
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/* This function is called when playbin2 has created the appsrc element, so we have
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* a chance to configure it. */
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static void source_setup (GstElement *pipeline, GstElement *source, CustomData *data) {
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gchar *audio_caps_text;
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GstCaps *audio_caps;
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g_print ("Source has been created. Configuring.\n");
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data->app_source = source;
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/* Configure appsrc */
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audio_caps_text = g_strdup_printf (AUDIO_CAPS, SAMPLE_RATE);
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audio_caps = gst_caps_from_string (audio_caps_text);
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g_object_set (source, "caps", audio_caps, NULL);
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g_signal_connect (source, "need-data", G_CALLBACK (start_feed), data);
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g_signal_connect (source, "enough-data", G_CALLBACK (stop_feed), data);
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gst_caps_unref (audio_caps);
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g_free (audio_caps_text);
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}
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int main(int argc, char *argv[]) {
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CustomData data;
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GstBus *bus;
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guint flags;
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/* Initialize cumstom data structure */
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memset (&data, 0, sizeof (data));
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data.b = 1; /* For waveform generation */
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data.d = 1;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Create the playbin2 element */
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data.pipeline = gst_parse_launch ("playbin2 uri=appsrc://", NULL);
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g_signal_connect (data.pipeline, "source-setup", G_CALLBACK (source_setup), &data);
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/* Instruct the bus to emit signals for each received message, and connect to the interesting signals */
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bus = gst_element_get_bus (data.pipeline);
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gst_bus_add_signal_watch (bus);
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g_signal_connect (G_OBJECT (bus), "message::error", (GCallback)error_cb, &data);
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gst_object_unref (bus);
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/* Start playing the pipeline */
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gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
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/* Create a GLib Main Loop and set it to run */
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data.main_loop = g_main_loop_new (NULL, FALSE);
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g_main_loop_run (data.main_loop);
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/* Free resources */
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gst_element_set_state (data.pipeline, GST_STATE_NULL);
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gst_object_unref (data.pipeline);
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return 0;
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}
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@ -0,0 +1,95 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup Label="ProjectConfigurations">
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<ProjectConfiguration Include="Debug|Win32">
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<Configuration>Debug</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Debug|x64">
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<Configuration>Debug</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|Win32">
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<Configuration>Release</Configuration>
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<Platform>Win32</Platform>
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</ProjectConfiguration>
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<ProjectConfiguration Include="Release|x64">
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<Configuration>Release</Configuration>
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<Platform>x64</Platform>
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</ProjectConfiguration>
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</ItemGroup>
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<ItemGroup>
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<ClCompile Include="..\..\playback-tutorial-3.c" />
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</ItemGroup>
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<PropertyGroup Label="Globals">
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<Keyword>Win32Proj</Keyword>
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<ProjectGuid>{B84F4F87-E804-456C-874E-AC76E0116268}</ProjectGuid>
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<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
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<PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>true</UseDebugLibraries>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
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<ConfigurationType>Application</ConfigurationType>
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<UseDebugLibraries>false</UseDebugLibraries>
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<WholeProgramOptimization>true</WholeProgramOptimization>
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<CharacterSet>Unicode</CharacterSet>
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</PropertyGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
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<ImportGroup Label="ExtensionSettings">
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</ImportGroup>
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<ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='Win32'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props')" />
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<Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props')" />
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</ImportGroup>
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<ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='x64'">
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<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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<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')" />
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<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')" />
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</ImportGroup>
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<PropertyGroup Label="UserMacros" />
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<PropertyGroup Condition="'$(Configuration)'=='Debug'">
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<LinkIncremental>true</LinkIncremental>
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</PropertyGroup>
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<PropertyGroup Condition="'$(Configuration)'=='Release'">
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<LinkIncremental>false</LinkIncremental>
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</PropertyGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
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<ClCompile>
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<PrecompiledHeader>
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</PrecompiledHeader>
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<WarningLevel>Level3</WarningLevel>
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<Optimization>Disabled</Optimization>
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<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>true</GenerateDebugInformation>
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<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
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<AdditionalLibraryDirectories>%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
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</Link>
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</ItemDefinitionGroup>
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<ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
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<ClCompile>
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<WarningLevel>Level3</WarningLevel>
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<PrecompiledHeader>
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</PrecompiledHeader>
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<Optimization>MaxSpeed</Optimization>
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<FunctionLevelLinking>true</FunctionLevelLinking>
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<IntrinsicFunctions>true</IntrinsicFunctions>
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<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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</ClCompile>
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<Link>
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<SubSystem>Console</SubSystem>
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<GenerateDebugInformation>false</GenerateDebugInformation>
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<EnableCOMDATFolding>true</EnableCOMDATFolding>
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</Link>
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</ItemDefinitionGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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<ImportGroup Label="ExtensionTargets">
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</ImportGroup>
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</Project>
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<ItemGroup>
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<ClCompile Include="..\..\playback-tutorial-3.c" />
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</ItemGroup>
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</Project>
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@ -27,6 +27,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "basic-tutorial-12", "basic-
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-4", "playback-tutorial-4\playback-tutorial-4.vcxproj", "{0342A79A-3522-416B-A4F8-58F5664B8415}"
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EndProject
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-3", "playback-tutorial-3\playback-tutorial-3.vcxproj", "{B84F4F87-E804-456C-874E-AC76E0116268}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Win32 = Debug|Win32
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@ -139,6 +141,14 @@ Global
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{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|Win32.Build.0 = Release|Win32
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{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|x64.ActiveCfg = Release|x64
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{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|x64.Build.0 = Release|x64
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{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|Win32.ActiveCfg = Debug|Win32
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{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|Win32.Build.0 = Debug|Win32
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{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|x64.ActiveCfg = Debug|x64
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{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|x64.Build.0 = Debug|x64
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{B84F4F87-E804-456C-874E-AC76E0116268}.Release|Win32.ActiveCfg = Release|Win32
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{B84F4F87-E804-456C-874E-AC76E0116268}.Release|Win32.Build.0 = Release|Win32
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{B84F4F87-E804-456C-874E-AC76E0116268}.Release|x64.ActiveCfg = Release|x64
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{B84F4F87-E804-456C-874E-AC76E0116268}.Release|x64.Build.0 = Release|x64
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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