HELP: how to using c to implement this ?

[Freeman Zhang]

HI ,

I'm using command line:

gst-launch filesrc location=recordSample ! audio/x-alaw, channels=1, rate=8000 ! alawdec ! autoaudiosink

to play a raw G711 file, it works.

But I don't know which GstElement shall I use with "audio/x-alaw, channels=1, rate=8000", is it "capsfiler"?

Please give me a hand.

Thanks

Freeman 

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[Kapil Agrawal]

You might want to try

gst_element_link_filtered ()

-kapil

On Wed, Nov 4, 2009 at 2:57 PM, Freeman Zhang <[hidden email]> wrote:

HI ,

I'm using command line:

gst-launch filesrc location=recordSample ! audio/x-alaw, channels=1, rate=8000 ! alawdec ! autoaudiosink

to play a raw G711 file, it works.

But I don't know which GstElement shall I use with "audio/x-alaw, channels=1, rate=8000", is it "capsfiler"?

Please give me a hand.

Thanks

Freeman 

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[Freeman Zhang]

Is it in this way?

                GstElement* filesrc = gst_element_factory_make("filesrc", "filesrc");

                  g_object_set(G_OBJECT(filesrc), "location", cmd->filename, NULL);

GstCaps *caps = gst_caps_from_string("audio/x-alaw, channels=1, rate=8000");

g_assert(caps != NULL);

decoder = gst_element_factory_make("alawdec", "decoder");

res = gst_element_link_filtered (filesrc, decoder, caps);

g_assert(res == TRUE);

                         

                        

But it return:

                         gst_element_link_pads_filtered: assertion `GST_IS_BIN (parent)' failed

Thanks

2009/11/4 Kapil Agrawal <[hidden email]>

You might want to try

gst_element_link_filtered ()

-kapil

On Wed, Nov 4, 2009 at 2:57 PM, Freeman Zhang <[hidden email]> wrote:

HI ,

I'm using command line:

gst-launch filesrc location=recordSample ! audio/x-alaw, channels=1, rate=8000 ! alawdec ! autoaudiosink

to play a raw G711 file, it works.

But I don't know which GstElement shall I use with "audio/x-alaw, channels=1, rate=8000", is it "capsfiler"?

Please give me a hand.

Thanks

Freeman 

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[Tim-Philipp Müller-2]

On Wed, 2009-11-04 at 18:02 +0800, Freeman Zhang wrote:

> decoder = gst_element_factory_make("alawdec", "decoder");
> res = gst_element_link_filtered (filesrc, decoder, caps);
> g_assert(res == TRUE);
>                                                  
> But it return:
>                          gst_element_link_pads_filtered: assertion
> `GST_IS_BIN (parent)' failed

You need to add elements to a pipeline/bin before linking them.

Cheers
 -Tim





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[Freeman Zhang]

Get it.

Thank you very much.

2009/11/4 Tim-Philipp Müller <[hidden email]>

On Wed, 2009-11-04 at 18:02 +0800, Freeman Zhang wrote:

> decoder = gst_element_factory_make("alawdec", "decoder");
> res = gst_element_link_filtered (filesrc, decoder, caps);
> g_assert(res == TRUE);
>
> But it return:
>                          gst_element_link_pads_filtered: assertion
> `GST_IS_BIN (parent)' failed

You need to add elements to a pipeline/bin before linking them.

Cheers
 -Tim

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[Freeman Zhang]

Well, for simplify my work.

I'm using gst_parse_launch to create the pipeline:

gchar str[200];

sprintf(str, "filesrc location=./media/%s" \

"! audio/x-alaw, channels=1, rate=8000" \

"! alawdec ! autoaudiosink", cmd->filename);

 

GError* err = NULL;

pipeline = gst_parse_launch(str, &err);

g_assert(pipeline != NULL);

                      // Play

                g_print("Playing.");

                gst_element_set_state (pipeline, GST_STATE_PLAYING);

                g_loop = g_main_loop_new (NULL, FALSE);

                g_main_loop_run (g_loop);

                gst_element_set_state (pipeline, GST_STATE_NULL);

                g_print("Stopped\n");

But no sound output,  I tried at command-line, it works.  What's the problem?

Thanks

2009/11/4 Freeman Zhang <[hidden email]>

Get it.

Thank you very much.

2009/11/4 Tim-Philipp Müller <[hidden email]>

On Wed, 2009-11-04 at 18:02 +0800, Freeman Zhang wrote:

> decoder = gst_element_factory_make("alawdec", "decoder");
> res = gst_element_link_filtered (filesrc, decoder, caps);
> g_assert(res == TRUE);
>
> But it return:
>                          gst_element_link_pads_filtered: assertion
> `GST_IS_BIN (parent)' failed

You need to add elements to a pipeline/bin before linking them.

Cheers
 -Tim

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