mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-28 11:10:37 +00:00
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
Normal file
153
gst-sdk/tutorials/playback-tutorial-3.c
Normal file
|
|
@ -0,0 +1,153 @@
|
|||
#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;
|
||||
}
|
||||
|
|
@ -0,0 +1,95 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup Label="ProjectConfigurations">
|
||||
<ProjectConfiguration Include="Debug|Win32">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Debug|x64">
|
||||
<Configuration>Debug</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|Win32">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>Win32</Platform>
|
||||
</ProjectConfiguration>
|
||||
<ProjectConfiguration Include="Release|x64">
|
||||
<Configuration>Release</Configuration>
|
||||
<Platform>x64</Platform>
|
||||
</ProjectConfiguration>
|
||||
</ItemGroup>
|
||||
<ItemGroup>
|
||||
<ClCompile Include="..\..\playback-tutorial-3.c" />
|
||||
</ItemGroup>
|
||||
<PropertyGroup Label="Globals">
|
||||
<Keyword>Win32Proj</Keyword>
|
||||
<ProjectGuid>{B84F4F87-E804-456C-874E-AC76E0116268}</ProjectGuid>
|
||||
<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
|
||||
<PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
|
||||
<ConfigurationType>Application</ConfigurationType>
|
||||
<UseDebugLibraries>true</UseDebugLibraries>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
|
||||
<ConfigurationType>Application</ConfigurationType>
|
||||
<UseDebugLibraries>false</UseDebugLibraries>
|
||||
<WholeProgramOptimization>true</WholeProgramOptimization>
|
||||
<CharacterSet>Unicode</CharacterSet>
|
||||
</PropertyGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
|
||||
<ImportGroup Label="ExtensionSettings">
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='Win32'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\libs\gstreamer-0.10.props')" />
|
||||
<Import Project="$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props" Condition="exists('$(GSTREAMER_SDK_ROOT_X86)\share\vs\2010\msvc\x86.props')" />
|
||||
</ImportGroup>
|
||||
<ImportGroup Label="PropertySheets" Condition="'$(Platform)'=='x64'">
|
||||
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
|
||||
<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')" />
|
||||
<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')" />
|
||||
</ImportGroup>
|
||||
<PropertyGroup Label="UserMacros" />
|
||||
<PropertyGroup Condition="'$(Configuration)'=='Debug'">
|
||||
<LinkIncremental>true</LinkIncremental>
|
||||
</PropertyGroup>
|
||||
<PropertyGroup Condition="'$(Configuration)'=='Release'">
|
||||
<LinkIncremental>false</LinkIncremental>
|
||||
</PropertyGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
|
||||
<ClCompile>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<Optimization>Disabled</Optimization>
|
||||
<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Console</SubSystem>
|
||||
<GenerateDebugInformation>true</GenerateDebugInformation>
|
||||
<AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
|
||||
<AdditionalLibraryDirectories>%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
|
||||
<ClCompile>
|
||||
<WarningLevel>Level3</WarningLevel>
|
||||
<PrecompiledHeader>
|
||||
</PrecompiledHeader>
|
||||
<Optimization>MaxSpeed</Optimization>
|
||||
<FunctionLevelLinking>true</FunctionLevelLinking>
|
||||
<IntrinsicFunctions>true</IntrinsicFunctions>
|
||||
<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
|
||||
</ClCompile>
|
||||
<Link>
|
||||
<SubSystem>Console</SubSystem>
|
||||
<GenerateDebugInformation>false</GenerateDebugInformation>
|
||||
<EnableCOMDATFolding>true</EnableCOMDATFolding>
|
||||
</Link>
|
||||
</ItemDefinitionGroup>
|
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
|
||||
<ImportGroup Label="ExtensionTargets">
|
||||
</ImportGroup>
|
||||
</Project>
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
<?xml version="1.0" encoding="utf-8"?>
|
||||
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||
<ItemGroup>
|
||||
<ClCompile Include="..\..\playback-tutorial-3.c" />
|
||||
</ItemGroup>
|
||||
</Project>
|
||||
|
|
@ -27,6 +27,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "basic-tutorial-12", "basic-
|
|||
EndProject
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-4", "playback-tutorial-4\playback-tutorial-4.vcxproj", "{0342A79A-3522-416B-A4F8-58F5664B8415}"
|
||||
EndProject
|
||||
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "playback-tutorial-3", "playback-tutorial-3\playback-tutorial-3.vcxproj", "{B84F4F87-E804-456C-874E-AC76E0116268}"
|
||||
EndProject
|
||||
Global
|
||||
GlobalSection(SolutionConfigurationPlatforms) = preSolution
|
||||
Debug|Win32 = Debug|Win32
|
||||
|
|
@ -139,6 +141,14 @@ Global
|
|||
{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|Win32.Build.0 = Release|Win32
|
||||
{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|x64.ActiveCfg = Release|x64
|
||||
{0342A79A-3522-416B-A4F8-58F5664B8415}.Release|x64.Build.0 = Release|x64
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|Win32.ActiveCfg = Debug|Win32
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|Win32.Build.0 = Debug|Win32
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|x64.ActiveCfg = Debug|x64
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Debug|x64.Build.0 = Debug|x64
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Release|Win32.ActiveCfg = Release|Win32
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Release|Win32.Build.0 = Release|Win32
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Release|x64.ActiveCfg = Release|x64
|
||||
{B84F4F87-E804-456C-874E-AC76E0116268}.Release|x64.Build.0 = Release|x64
|
||||
EndGlobalSection
|
||||
GlobalSection(SolutionProperties) = preSolution
|
||||
HideSolutionNode = FALSE
|
||||
|
|
|
|||
Loading…
Reference in a new issue