ubuntu下 gstreamer 的配置及播放音视频例子
官方网址：http://gstreamer.freedesktop.org
Gstreamer安装:
使用sudo apt-get install 安装
sudo apt-get install libgstreamer0.10-dev gstreamer-tools gstreamer0.10-tools gstreamer0.10-doc
sudo apt-get install gstreamer0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-ugly gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse
安装了如下的gst的插件：
gstreamer0.10-tools
gstreamer0.10-x
gstreamer0.10-plugins-base
gstreamer0.10-plugins-good
gstreamer0.10-plugins-ugly
gstreamer0.10-plugins-bad
gstreamer0.10-ffmpeg
gstreamer0.10-alsa
gstreamer0.10-schroedinger
gstreamer0.10-pulseaudio
有可能需要安装的软件：
sudo apt-get install bison
sudo apt-get install flex
sudo apt-get install zlib1g
mad解码插件
apt-get install libmad0-dev
apt-get install gstreamer0.10-plugins-ugly
Initializing GStreamer
#include
#include
int main (int argc, char *argv[])
{
const gchar *nano_str;
guint major, minor, micro, nano;
gst_init (&argc, &argv);
gst_version (&major, &minor, µ, &nano);
if (nano == 1)
nano_str = "(CVS)";
else if (nano == 2)
nano_str = "(Prerelease)";
else
nano_str = "";
printf ("This program is linked against GStreamer %d.%d.%d %s\n",
major, minor, micro, nano_str);
return 0;
} #include
#include
//定义消息处理函数,
static gboolean bus_call(GstBus *bus,GstMessage *msg,gpointer data)
{
GMainLoop *loop = (GMainLoop *) data;//这个是主循环的指针，在接受EOS消息时退出循环
switch (GST_MESSAGE_TYPE(msg))
{
case GST_MESSAGE_EOS:
g_print("End of stream\n");
g_main_loop_quit(loop);
break;
case GST_MESSAGE_ERROR:
{
gchar *debug;
GError *error;
gst_message_parse_error(msg,&error,&debug);
g_free(debug);
g_printerr("ERROR:%s\n",error->message);
g_error_free(error);
g_main_loop_quit(loop);
break;
}
default:
break;
}
return TRUE;
}
int main(int argc,char *argv[])
{
GMainLoop *loop;
GstElement *pipeline,*source,*decoder,*sink;//定义组件
GstBus *bus;
gst_init(&argc,&argv);
loop = g_main_loop_new(NULL,FALSE);//创建主循环，在执行 g_main_loop_run后正式开始循环
if(argc != 2)
{
g_printerr("Usage:%s \n",argv[0]);
return -1;
}
//创建管道和组件
pipeline = gst_pipeline_new("audio-player");
source = gst_element_factory_make("filesrc","file-source");
decoder = gst_element_factory_make("mad","mad-decoder");
sink = gst_element_factory_make("autoaudiosink","audio-output");
if(!pipeline||!source||!decoder||!sink){
g_printerr("One element could not be created.Exiting.\n");
return -1;
}
//设置 source的location 参数。即 文件地址.
g_object_set(G_OBJECT(source),"location",argv[1],NULL);
//得到 管道的消息总线
bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
//添加消息监视器
gst_bus_add_watch(bus,bus_call,loop);
gst_object_unref(bus);
//把组件添加到管道中.管道是一个特殊的组件，可以更好的让数据流动
gst_bin_add_many(GST_BIN(pipeline),source,decoder,sink,NULL);
//依次连接组件
gst_element_link_many(source,decoder,sink,NULL);
//开始播放
gst_element_set_state(pipeline,GST_STATE_PLAYING);
g_print("Running\n");
//开始循环
g_main_loop_run(loop);
g_print("Returned,stopping playback\n");
gst_element_set_state(pipeline,GST_STATE_NULL);
gst_object_unref(GST_OBJECT(pipeline));
return 0;
} 编译运行
gcc -Wall test2.c -o test2 $(pkg-config --cflags --libs gstreamer-0.10)
（注意！！！很多地方写的这条命令 ：gcc -Wall $(pkg-config --cflags --libs gstreamer-0.10) -g test2.c -o test2 ，根本编译不过！）
编译时借助了 pkg-config
pkg-config --cflags --libs gstreamer-0.10 会把gstreamer-0.10编译所依赖的库的路径 头文件的路径全部帮你找出来，不用你再依次写出。
(上面这条pkg-config --cflags --libs gstreamer-0.10 就相当于：
-pthread -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -I/usr/include/gstreamer-0.10 -I/usr/include/libxml2 -pthread -L/usr/lib/i386-linux-gnu -lgstreamer-0.10 -lgobject-2.0 -lgmodule-2.0 -lxml2 -lgthread-2.0 -lrt -lglib-2.0)
./test2 ./abc.mp3
播放视频：
Ubuntu 12.04
gst-launch-0.10 filesrc location=/tmp/video_stream_pipe ! decodebin ! ffmpegcolorspace ! videoscale ! ximagesink sync=false
Ubuntu 13.10
gst-launch-1.0 filesrc location=/tmp/video_stream_pipe ! decodebin ! videoconvert ! xvimagesink sync=false
gst-launch-1.0 filesrc location=/tmp/video_stream_pipe ! decodebin ! videoconvert ! ximagesink sync=false以下摘至：http://linux.die.net/man/1/gst-launch-0.10
gst-launch-0.10(1) - Linux man page
Name
gst-launch - build and run a GStreamer pipeline
Synopsis
gst-launch [OPTION...] PIPELINE-DESCRIPTION
Description
gst-launch is a tool that builds and runs basicGStreamer pipelines.
In simple form, a PIPELINE-DESCRIPTION is a list of elements separated by exclamation marks (!). Properties may be appended to elements, in the formproperty=value.
For a complete description of possible PIPELINE-DESCRIPTIONS see the section pipeline descriptionbelow or consult the GStreamer documentation.
Please note that gst-launch is primarily a debugging tool for developers and users. You should not build applications on top of it. For applications, use the gst_parse_launch() function of the GStreamer API as an easy way to construct pipelines from pipeline descriptions.
Options
gst-launch accepts the following options:
- --help
Print help synopsis and available FLAGS
-v, --verboseOutput status information and property notifications -q, --quietDo not print any progress information -m, --messagesOutput messages posted on the pipeline's bus -t, --tagsOutput tags (also known as metadata) -o FILE, --output=FILESave XML representation of pipeline to FILE and exit -f, --no_faultDo not install a fault handler -T, --tracePrint memory allocation traces. The feature must be enabled at compile time to work.Gstreamer Options
gst-launch also accepts the following options that are common to all GStreamer applications:
- --gst-version
- Prints the version string of the GStreamer core library.
- --gst-fatal-warnings
- Causes GStreamer to abort if a warning message occurs. This is equivalent to setting the environment variable G_DEBUG to 'fatal_warnings' (see the section environment variables below for further information).
- --gst-debug=STRING
-
A comma separated list of category_name:level pairs to specify debugging levels for each category. Level is in the range 0-5 where 0 will show no messages, and 5 will show all messages. The wildcard * can be used to match category names.
Use --gst-debug-help to show category names
Example: GST_CAT:5,GST_ELEMENT_*:3,oggdemux:5
- --gst-debug-level=LEVEL
- Sets the threshold for printing debugging messages. A higher level will print more messages. The useful range is 0-5, with the default being 0.
- --gst-debug-no-color
- GStreamer normally prints debugging messages so that the messages are color-coded when printed to a terminal that handles ANSI escape sequences. Using this option causes GStreamer to print messages without color. Setting the GST_DEBUG_NO_COLOR environment variable will achieve the same thing.
- --gst-debug-disable
- Disables debugging.
- --gst-debug-help
- Prints a list of available debug categories and their default debugging level.
- --gst-plugin-spew
- GStreamer info flags to set Enable printout of errors while loading GStreamer plugins
- --gst-plugin-path=PATH
- Add directories separated with ':' to the plugin search path
- --gst-plugin-load=PLUGINS
- Preload plugins specified in a comma-separated list. Another way to specify plugins to preload is to use the environment variable GST_PLUGIN_PATH
Pipeline Description
A pipeline consists elements and links. Elements can be put into bins of different sorts. Elements, links and bins can be specified in a pipeline description in any order.
Elements
ELEMENTTYPE [PROPERTY1 ...]
Creates an element of type ELEMENTTYPE and sets the PROPERTIES.
Properties
PROPERTY=VALUE ...
Sets the property to the specified value. You can use gst-inspect(1) to find out about properties and allowed values of different elements.
Enumeration properties can be set by name, nick or value.
Bins
[BINTYPE.] ( [PROPERTY1 ...] PIPELINE-DESCRIPTION )
Specifies that a bin of type BINTYPE is created and the given properties are set. Every element between the braces is put into the bin. Please note the dot that has to be used after the BINTYPE. You will almost never need this functionality, it is only really useful for applications using the gst_launch_parse() API with 'bin' as bintype. That way it is possible to build partial pipelines instead of a full-fledged top-level pipeline.
Links
[[SRCELEMENT].[PAD1,...]] ! [[SINKELEMENT].[PAD1,...]] [[SRCELEMENT].[PAD1,...]] ! CAPS ! [[SINKELEMENT].[PAD1,...]]
Links the element with name SRCELEMENT to the element with name SINKELEMENT, using the caps specified in CAPS as a filter. Names can be set on elements with the name property. If the name is omitted, the element that was specified directly in front of or after the link is used. This works across bins. If a padname is given, the link is done with these pads. If no pad names are given all possibilities are tried and a matching pad is used. If multiple padnames are given, both sides must have the same number of pads specified and multiple links are done in the given order.
So the simplest link is a simple exclamation mark, that links the element to the left of it to the element right of it.
Caps
MIMETYPE [, PROPERTY[, PROPERTY ...]]] [; CAPS[; CAPS ...]]
Creates a capability with the given mimetype and optionally with given properties. The mimetype can be escaped using " or '. If you want to chain caps, you can add more caps in the same format afterwards.
Properties
NAME=[(TYPE)]VALUE
in lists and ranges: [(TYPE)]VALUE
Sets the requested property in capabilities. The name is an alphanumeric value and the type can have the following case-insensitive values:
- i or int for integer values or ranges
- f or float for float values or ranges
- 4 or fourcc for FOURCC values
- b, bool or boolean for boolean values
- s, str or string for strings
- fraction for fractions (framerate, pixel-aspect-ratio)
- l or list for lists
If no type was given, the following order is tried: integer, float, boolean, string.
Integer values must be parsable by strtol(), floats by strtod(). FOURCC values may either be integers or strings. Boolean values are (case insensitive) yes, no, true or false and may like strings be escaped with " or '.
Ranges are in this format: [ VALUE, VALUE ]
Lists use this format: ( VALUE [, VALUE ...] )
Pipeline Control
A pipeline can be controlled by signals. SIGUSR2 will stop the pipeline (GST_STATE_NULL); SIGUSR1 will put it back to play (GST_STATE_PLAYING). By default, the pipeline will start in the playing state.
There are currently no signals defined to go into the ready or pause (GST_STATE_READY and GST_STATE_PAUSED) state explicitely.
Pipeline Examples
The examples below assume that you have the correct plug-ins available. In general, "osssink" can be substituted with another audio output plug-in such as "esdsink", "alsasink", "osxaudiosink", or "artsdsink". Likewise, "xvimagesink" can be substituted with "ximagesink", "sdlvideosink", "osxvideosink", or "aasink". Keep in mind though that different sinks might accept different formats and even the same sink might accept different formats on different machines, so you might need to add converter elements like audioconvert and audioresample (for audio) or ffmpegcolorspace (for video) in front of the sink to make things work.
Audio playback
gst-launch filesrc location=music.mp3 ! mad ! audioconvert ! audioresample ! osssink
Play the mp3 music file "music.mp3" using a libmad-based plug-in and output to an OSS device
gst-launch filesrc location=music.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! osssink
Play an Ogg Vorbis format file
gst-launch gnomevfssrc location=music.mp3 ! mad ! osssink
gst-launch gnomevfssrc location=http://domain.com/music.mp3 ! mad ! audioconvert ! audioresample ! osssink
Play an mp3 file or an http stream using GNOME-VFS
gst-launch gnomevfssrc location=smb://computer/music.mp3 ! mad ! audioconvert ! audioresample ! osssink
Use GNOME-VFS to play an mp3 file located on an SMB server
Format conversion
gst-launch filesrc location=music.mp3 ! mad ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg
Convert an mp3 music file to an Ogg Vorbis file
gst-launch filesrc location=music.mp3 ! mad ! audioconvert ! flacenc ! filesink location=test.flac
Convert to the FLAC format
Other
gst-launch filesrc location=music.wav ! wavparse ! audioconvert ! audioresample ! osssink
Plays a .WAV file that contains raw audio data (PCM).
gst-launch filesrc location=music.wav ! wavparse ! audioconvert ! vorbisenc ! oggmux ! filesink location=music.ogg
gst-launch filesrc location=music.wav ! wavparse ! audioconvert ! lame ! filesink location=music.mp3
Convert a .WAV file containing raw audio data into an Ogg Vorbis or mp3 file
gst-launch cdparanoiasrc mode=continuous ! audioconvert ! lame ! id3v2mux ! filesink location=cd.mp3
rips all tracks from compact disc and convert them into a single mp3 file
gst-launch cdparanoiasrc track=5 ! audioconvert ! lame ! id3v2mux ! filesink location=track5.mp3
rips track 5 from the CD and converts it into a single mp3 file
Using gst-inspect(1), it is possible to discover settings like the above for cdparanoiasrc that will tell it to rip the entire cd or only tracks of it. Alternatively, you can use an URI and gst-launch-0.10 will find an element (such as cdparanoia) that supports that protocol for you, e.g.: gst-launch cdda://5 ! lame vbr=new vbr-quality=6 ! filesink location=track5.mp3
gst-launch osssrc ! audioconvert ! vorbisenc ! oggmux ! filesink location=input.ogg
records sound from your audio input and encodes it into an ogg file
Video
gst-launch filesrc location=JB_FF9_TheGravityOfLove.mpg ! dvddemux ! mpeg2dec ! xvimagesink
Display only the video portion of an MPEG-1 video file, outputting to an X display window
gst-launch filesrc location=/flflfj.vob ! dvddemux ! mpeg2dec ! sdlvideosink
Display the video portion of a .vob file (used on DVDs), outputting to an SDL window
gst-launch filesrc location=movie.mpg ! dvddemux name=demuxer demuxer. ! queue ! mpeg2dec ! sdlvideosink demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink
Play both video and audio portions of an MPEG movie
gst-launch filesrc location=movie.mpg ! mpegdemux name=demuxer demuxer. ! queue ! mpeg2dec ! ffmpegcolorspace ! sdlvideosink demuxer. ! queue ! mad ! audioconvert ! audioresample ! osssink
Play an AVI movie with an external text subtitle stream
This example also shows how to refer to specific pads by name if an element (here: textoverlay) has multiple sink or source pads.
gst-launch textoverlay name=overlay ! ffmpegcolorspace ! videoscale ! autovideosink filesrc location=movie.avi ! decodebin2 ! ffmpegcolorspace ! overlay.video_sink filesrc location=movie.srt ! subparse ! overlay.text_sink
Play an AVI movie with an external text subtitle stream using playbin2
gst-launch playbin2 uri=file:///path/to/movie.avi suburi=file:///path/to/movie.srt
Network streaming
Stream video using RTP and network elements.
gst-launch v4l2src ! video/x-raw-yuv,width=128,height=96,format='(fourcc)'UYVY ! ffmpegcolorspace ! ffenc_h263 ! video/x-h263 ! rtph263ppay pt=96 ! udpsink host=192.168.1.1 port=5000 sync=false
Use this command on the receiver
gst-launch udpsrc port=5000 ! application/x-rtp, clock-rate=90000,payload=96 ! rtph263pdepay queue-delay=0 ! ffdec_h263 ! xvimagesink
This command would be run on the transmitter
Diagnostic
gst-launch -v fakesrc num-buffers=16 ! fakesink
Generate a null stream and ignore it (and print out details).
gst-launch audiotestsrc ! audioconvert ! audioresample ! osssink
Generate a pure sine tone to test the audio output
gst-launch videotestsrc ! xvimagesink
gst-launch videotestsrc ! ximagesink
Generate a familiar test pattern to test the video output
Automatic linking
You can use the decodebin element to automatically select the right elements to get a working pipeline.
gst-launch filesrc location=musicfile ! decodebin ! audioconvert ! audioresample ! osssink
Play any supported audio format
gst-launch filesrc location=videofile ! decodebin name=decoder decoder. ! queue ! audioconvert ! audioresample ! osssink decoder. ! ffmpegcolorspace ! xvimagesink
Play any supported video format with video and audio output. Threads are used automatically. To make this even easier, you can use the playbin element:
gst-launch playbin uri=file:///home/joe/foo.avi
Filtered connections
These examples show you how to use filtered caps.
gst-launch videotestsrc ! 'video/x-raw-yuv,format=(fourcc)YUY2;video/x-raw-yuv,format=(fourcc)YV12' ! xvimagesink
Show a test image and use the YUY2 or YV12 video format for this.
gst-launch osssrc ! 'audio/x-raw-int,rate=[32000,64000],width=[16,32],depth={16,24,32},signed=(boolean)true' ! wavenc ! filesink location=recording.wav
record audio and write it to a .wav file. Force usage of signed 16 to 32 bit samples and a sample rate between 32kHz and 64KHz.
Environment Variables
GST_DEBUG
- Comma-separated list of debug categories and levels, e.g. GST_DEBUG=totem:4,typefind:5
- GST_DEBUG_NO_COLOR
- When this environment variable is set, coloured debug output is disabled.
- GST_DEBUG_DUMP_DOT_DIR
- When set to a filesystem path, store dot files of pipeline graphs there.
- GST_REGISTRY
- Path of the plugin registry file. Default is ~/.gstreamer-0.10/registry-CPU.xml where CPU is the machine/cpu type GStreamer was compiled for, e.g. 'i486', 'i686', 'x86-64', 'ppc', etc. (check the output of "uname -i" and "uname -m" for details).
- GST_REGISTRY_UPDATE
- Set to "no" to force GStreamer to assume that no plugins have changed, been added or been removed. This will make GStreamer skip the initial check whether a rebuild of the registry cache is required or not. This may be useful in embedded environments where the installed plugins never change. Do not use this option in any other setup.
- GST_PLUGIN_PATH
- Specifies a list of directories to scan for additional plugins. These take precedence over the system plugins.
- GST_PLUGIN_SYSTEM_PATH
- Specifies a list of plugins that are always loaded by default. If not set, this defaults to the system-installed path, and the plugins installed in the user's home directory
- OIL_CPU_FLAGS
- Useful liboil environment variable. Set OIL_CPU_FLAGS=0 when valgrind or other debugging tools trip over liboil's CPU detection (quite a few important GStreamer plugins like videotestsrc, audioconvert or audioresample use liboil).
- G_DEBUG
- Useful GLib environment variable. Set G_DEBUG=fatal_warnings to make GStreamer programs abort when a critical warning such as an assertion failure occurs. This is useful if you want to find out which part of the code caused that warning to be triggered and under what circumstances. Simply set G_DEBUG as mentioned above and run the program in gdb (or let it core dump). Then get a stack trace in the usual way.
Files
~/.gstreamer-0.10/registry-*.xml
- The xml plugin database; can be deleted at any time, will be re-created automatically when it does not exist yet or plugins change.