[gst-devel] spectrum plug-in not working properly with alsasrc

[Guilherme]

Stefan, I have the .wav been recorded properly...!
Do you think that it might be a hardware problem.. the spectrum should 
work either way with alsatestsrc and microphone????

Tks!

-------------------

Guilherme Longo
Dept. Eng. da Computação
Unaerp

Linux User - #484927

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http://www.istf.com.br/?page=perguntas

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Stefan Kost wrote:
> Guilherme Raymo Longo schrieb:
>   
>> Good morning mates.
>>
>> I've been working on this code over a month and I can't figure out
>> what is wrong with it.
>>
>> I am developing a spectrum analyser and as a first step the program is
>> capturing sound from alsa and analysing the sound using the spectrum
>> plug-in.
>>
>> If I use audiotestsrc, I get the results on screen as expected, when I
>> change to alsasrc, I still get the results on screen but without
>> modification, as if I didn't have any sound comming from my microfone.
>> Its is strange 'cause my mic is working pretty well since I am able to
>> record sound.
>>
>> I was wondering if someone could gimme some help here.....!
>>     
>
> if you do
> gst-launch alsasrc num-buffers=100 ! wavenc ! filesink location=test.wav
> and you make some noise. Does the resulting wav file has sound (or noise
> :) ) or is it silent?
>
> Stefan
>   
>> Thanks in advanced...
>>
>>
>>
>> #include <string.h>
>> #include <stdlib.h>
>> #include <gst/gst.h>
>>
>> static guint spect_bands = 20;
>>
>> #define AUDIOFREQ 44100
>>
>> /* receive spectral data from element message */
>> gboolean
>> message_handler (GstBus * bus, GstMessage * message, gpointer data)
>> {
>>   if (message->type == GST_MESSAGE_ELEMENT) {
>>     const GstStructure *s = gst_message_get_structure (message);
>>     const gchar *name = gst_structure_get_name (s);
>>     GstClockTime endtime;
>>
>>     if (strcmp (name, "spectrum") == 0) {
>>       const GValue *magnitudes;
>>       const GValue *phases;
>>       const GValue *mag, *phase;
>>       gdouble freq;
>>       guint i;
>>
>>       if (!gst_structure_get_clock_time (s, "endtime", &endtime))
>>         endtime = GST_CLOCK_TIME_NONE;
>>
>>       g_print ("New spectrum message, endtime %" GST_TIME_FORMAT "\n",
>>           GST_TIME_ARGS (endtime));
>>
>>       magnitudes = gst_structure_get_value (s, "magnitude");
>>       phases = gst_structure_get_value (s, "phase");
>>
>>       for (i = 0; i < spect_bands; ++i) {
>>         freq = (gdouble) ((AUDIOFREQ / 2) * i + AUDIOFREQ / 4) /
>> spect_bands;
>>         mag = gst_value_list_get_value (magnitudes, i);
>>         phase = gst_value_list_get_value (phases, i);
>>
>>         if (mag != NULL && phase != NULL) {
>>           g_print ("band %d (freq %g): magnitude %f dB phase %f\n", i,
>> freq,
>>               g_value_get_float (mag), g_value_get_float (phase));
>>         }
>>       }
>>       g_print ("\n");
>>     }
>>   }
>>   return TRUE;
>> }
>>
>> int
>> main (int argc, char *argv[])
>> {
>>   GstElement *bin;
>>   GstElement *src, *spectrum, *sink;
>>   GstBus *bus;
>>   GMainLoop *loop;
>>
>>   gst_init (&argc, &argv);
>>
>>   bin = gst_pipeline_new ("bin");
>>
>>   src = gst_element_factory_make ("audiotestsrc", "src");
>>
>>   spectrum = gst_element_factory_make ("spectrum", "spectrum");
>>   g_object_set (G_OBJECT (spectrum), "bands", spect_bands,
>>       "message", TRUE, "message-phase", TRUE, NULL);
>>
>>   sink = gst_element_factory_make ("fakesink", "sink");
>>   g_object_set (G_OBJECT (sink), "sync", TRUE, NULL);
>>
>>   gst_bin_add_many (GST_BIN (bin), src, spectrum, sink, NULL);
>>
>>
>>   if (!gst_element_link (src, spectrum) ||
>>       !gst_element_link (spectrum, sink)) {
>>     fprintf (stderr, "can't link elements\n");
>>     exit (1);
>>   }
>>
>>  
>>  bus = gst_element_get_bus (bin);
>>   gst_bus_add_watch (bus, message_handler, NULL);
>>   gst_object_unref (bus);
>>
>>   gst_element_set_state (bin, GST_STATE_PLAYING);
>>
>>   /* we need to run a GLib main loop to get the messages */
>>   loop = g_main_loop_new (NULL, FALSE);
>>   g_main_loop_run (loop);
>>
>>   gst_element_set_state (bin, GST_STATE_NULL);
>>
>>   gst_object_unref (bin);
>>
>>   return 0;
>> }
>> -- 
>> Guilherme Raymo Longo
>> Software Developer
>> Mob. 087 - 3179008
>> msn: grlongo.ireland at hotmail.com <mailto:grlongo.ireland at hotmail.com>
>> skype: grlongo.ireland
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>>     
>
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