crossfading audio error: gst_mad_chain: mad_header_decode had an error: lost synchronization
Rossana Guerra
guerra.rossana at gmail.com
Sun Nov 13 15:55:00 PST 2011
Hi, I change the following lines and it works now, however I appreciate any
technical explanation:
Instead of
mad1 = gst_element_factory_make ("mad","mad1");
mad2 = gst_element_factory_make ("mad","mad2");
I put these lines:
aconv1 = gst_element_factory_make ("audioconvert","aconv1");
aconv2 = gst_element_factory_make ("audioconvert","aconv2");
Thanks
Rossana
2011/11/13 Rossana Guerra <guerra.rossana at gmail.com>
> Hi, I'm trying to do an audio crossfade, it plays the first audio file
> correctly, but when it should play the second one, these errors come:
>
> mad gstmad.c:1489:gst_mad_chain: mad_header_decode had an error: lost
> synchronization
> 0:00:11.054542971 5898 0x1757a60 WARN mad
> gstmad.c:1516:gst_mad_chain: mad_frame_decode had an error: reserved header
> layer v
>
> I could did the video crossfade with a similar technique. I appreciate any
> tip on about what I am doing wrong.
>
> Thanks and regards.
>
> Rossana
>
> Here's the core of the code:
>
>
> static void on_pad_added (GstElement *element, GstPad *pad, gpointer data)
> {
> GstPad *sinkpad = NULL;
> GstElement * queue = (GstElement *) data;
>
> /* Ahora linkeo el pad de comp con sink pad */
> g_print ("Dynamic pad created, linking queue\n");
> sinkpad = gst_element_get_static_pad (queue, "sink");
>
> gst_pad_link (pad, sinkpad);
>
> gst_object_unref (sinkpad);
>
> }
>
> GstElement * getBin(const gchar * nomBin, GstElement * &v1, GstElement
> *&v2, GstElement * &mad1, GstElement * &mad2, GstElement * &mixer)
> {
>
> GstElement * bin = gst_bin_new(nomBin);
>
> if (!bin)
> {
> g_printerr ("No se pudo crear el bin. Saliendo\n");
> return NULL;
> }
>
> v1 = gst_element_factory_make ("volume","vol1");
> v2 = gst_element_factory_make ("volume","vol2");
> mad1 = gst_element_factory_make ("mad","mad1");
> mad2 = gst_element_factory_make ("mad","mad2");
>
> mixer = gst_element_factory_make("adder", "mixer");
>
>
> if ((!v1) || (!v2) || (!mad1) || (!mad2) || (!mixer))
> {
> g_printerr ("Alguno de los elementos del Bin no pudo ser creado.
> Saliendo\n");
> return NULL;
> }
>
> // Anexamos al bin
> gst_bin_add_many(GST_BIN (bin),v1,v2,mad1,mad2,mixer, NULL);
>
> gst_element_link (mad1,v1);
> gst_element_link (mad2,v2);
> g_print("enlazo los mad con los volumenes \n");
>
>
> /* Now link volume outs to adder ins, on request */
> GstPad *pad = 0;
>
> /* src #1 */
> pad = gst_element_get_request_pad(mixer, "sink%d");
> g_assert(pad != NULL);
> gst_pad_link(gst_element_get_pad(v1, "src"), pad);
> /* Same thing for #2 */
> pad = gst_element_get_request_pad (mixer, "sink%d");
> g_assert(pad != NULL);
> gst_pad_link(gst_element_get_pad(v2, "src"), pad);
>
> g_print("hasta aqui ok!!! \n");
>
>
> return bin;
> }
>
> void getAndSetController(GstElement * volumen2, gdouble duracion)
> {
> GstController * ctrl = NULL;
> if (!(ctrl = gst_controller_new (G_OBJECT (volumen2), "volume",NULL)))
> {
> GST_WARNING ("No puede controlar el elemento fuente\n");
> return;
> }
>
> // Todo valor GValue debe inicializarse en 0
> GValue val_double = { 0, };
> g_value_init (&val_double, G_TYPE_DOUBLE);
>
>
> // Creo la fuente al controlador y la asocio al controlador
> // Seteo modo de interpolacion
>
> GstInterpolationControlSource * csource =
> gst_interpolation_control_source_new();
> gst_controller_set_control_source (ctrl, "volume", GST_CONTROL_SOURCE
> (csource));
>
>
> gst_interpolation_control_source_set_interpolation_mode(csource,GST_INTERPOLATE_LINEAR);
>
> // Seteo primer valor
> g_value_set_double(&val_double, 0.0);
> gst_interpolation_control_source_set(csource,(0 *
> GST_MSECOND),&val_double);
>
> // Seteo segundo valor
> g_value_set_double (&val_double, 1.0);
> gst_interpolation_control_source_set(csource,(duracion *
> GST_MSECOND),&val_double);
>
>
> g_object_unref (csource);
>
> }
>
> void addGhostPadsToBin(GstElement *mad1, GstElement * mad2, GstElement *
> mixer, GstElement* bin)
> {
> /* add ghostpad */
> GstPad * pad1 = gst_element_get_static_pad (mad1, "sink");
> gst_element_add_pad(bin, gst_ghost_pad_new("alfasink1", pad1));
> gst_object_unref (GST_OBJECT (pad1));
>
> GstPad * pad2 = gst_element_get_static_pad (mad2, "sink");
> gst_element_add_pad(bin, gst_ghost_pad_new("alfasink2", pad2));
> gst_object_unref(GST_OBJECT(pad2));
>
> GstPad * pad3 = gst_element_get_static_pad (mixer, "src");
> gst_element_add_pad(bin, gst_ghost_pad_new("mixersrc", pad3));
> gst_object_unref(GST_OBJECT(pad3));
> }
>
> void crossTransicion(gdouble duracion, GstElement * & bin,gint transicion
> = 1)
> {
> // devuelve el bin
> GstElement * volumen1, *volumen2, *mad1,*mad2,*mixer;
> volumen1 = 0;
> volumen2 = 0;
> mad1 = 0;
> mad2 = 0;
> mixer = 0;
>
> bin = getBin("bin",volumen1, volumen2,mad1,mad2,mixer); // Crea el
> bin y los elementos
>
> getAndSetController(volumen2,duracion);
>
> addGhostPadsToBin(mad1, mad2, mixer, bin);
>
> }
>
> GstElement * getSetPipeline(gchar *argv[])
> {
> gint dur1 = 9000; // duration (in ms) to play of first clip
> gint dur2 = 8000; // duration (in ms) to play of second clip
> gint dur_crossfade = 500; //number of milliseconds to crossfade for
> GstElement *comp = 0;
> GstElement *pipeline, *audio1, *audio2, *op, *bin, *queue, *sink;
>
> // ejecuta 2 clips serialmente con un crosdfade entre ellos usando el
> elemento (GnlOlin) gnlcomposition
> if ((comp = gst_element_factory_make("gnlcomposition",
> "micomposicion")) == NULL)
> {
> printf ("\n Fallo al crear gnlcomposition \n");
> return NULL;
> }
>
> GstCaps *caps =
> gst_caps_from_string("audio/x-raw-int;audio/x-raw-float");
>
> // Create our composition
> g_object_set(G_OBJECT(comp), "caps", caps, NULL);
>
> op = gst_element_factory_make("gnloperation", "op");
>
> crossTransicion(dur_crossfade, bin,1);
>
> if (gst_bin_add (GST_BIN (op), bin) == FALSE)
> {
> printf ("\n No pudo agregar el bin a la gnloperacion op \n");
> return NULL;
> }
>
> g_object_set (op,"start", (dur1-dur_crossfade) * GST_MSECOND,NULL);
> g_object_set (op,"duration", dur_crossfade * GST_MSECOND,NULL);
> g_object_set (op,"media-start", 0 * GST_MSECOND,NULL);
> g_object_set(op,"media-duration", dur_crossfade * GST_MSECOND,NULL);
> g_object_set(op,"priority",0,NULL);
>
> if (gst_bin_add (GST_BIN (comp), op) == FALSE)
> {
> printf ("\n No pudo agregar la gnloperacion a la gnlcomposition \n");
> return NULL;
> }
>
> // configura primer clip
>
> if ((audio1 = gst_element_factory_make("gnlfilesource", "audio1")) ==
> NULL)
> {
> printf ("\n Falló la creacion del gnlfilesource \n");
> return NULL;
> }
> if (gst_bin_add (GST_BIN (comp), audio1) == FALSE)
> {
> printf ("\n No pudo agregar audio1 a comp \n");
> return NULL;
> }
>
> g_object_set (audio1, "location", argv[1], NULL);
> g_object_set(audio1, "uri", argv[1],NULL);
> g_object_set (audio1, "start", 0 * GST_MSECOND, NULL);
> g_object_set (audio1, "duration", dur1 * GST_MSECOND, NULL);
> g_object_set (audio1, "media-start", 0* GST_MSECOND, NULL);
> g_object_set (audio1, "media-duration", dur1 * GST_MSECOND, NULL);
> g_object_set (audio1, "priority", 1,NULL);
>
> // crea 2º clip
> if ((audio2 = gst_element_factory_make("gnlfilesource", "audio2")) ==
> NULL)
> {
> printf ("\n Falló la creacion del gnlfilesource \n");
> return NULL;
> }
>
> if (gst_bin_add (GST_BIN (comp), audio2) == FALSE)
> {
> printf ("\n No pudo agregar video2 a comp \n");
> return NULL;
> }
>
> g_object_set (audio2, "location", argv[2], NULL);
> g_object_set (audio2,"uri",argv[2],NULL);
> g_object_set (audio2, "start", (dur1-dur_crossfade) * GST_MSECOND,
> NULL);
> g_object_set (audio2, "duration", dur2 * GST_MSECOND, NULL);
> g_object_set (audio2, "media-start", 0 * GST_MSECOND, NULL);
> g_object_set (audio2, "media-duration", dur2 * GST_MSECOND, NULL);
> g_object_set (audio2, "priority", 2,NULL);
>
> // setup the backend viewer
> queue = gst_element_factory_make("queue", "queue");
> sink = gst_element_factory_make("autoaudiosink", "sink");
>
> pipeline = gst_pipeline_new ("audio-player");
>
> /* Agrego elementos al pipeline */
>
> gst_bin_add_many (GST_BIN (pipeline),comp, queue, sink, NULL);
>
> g_signal_connect (comp, "pad-added", G_CALLBACK (on_pad_added),queue);
>
> gst_element_link (queue, sink);
>
> return pipeline;
>
> }
>
> void startPlay(GstElement * pip)
> {
> /* Set the pipeline to "playing" state*/
> gst_element_set_state (pip, GST_STATE_PLAYING);
>
> }
>
>
> int main(gint argc, gchar *argv[])
> {
> GMainLoop *loop = NULL;
>
> /* init GStreamer */
> gst_init (&argc, &argv);
> gst_controller_init (&argc, &argv);
>
> loop = g_main_loop_new (NULL, FALSE);
>
> /* chequeamos sintaxis */
> if (argc != 3)
> {
> g_print ("Uso: %s <URI1> <URI2>\n", argv[0]);
> return -1;
> }
>
> GstElement * play = getSetPipeline(argv);
>
>
> GstBus *bus2 = gst_pipeline_get_bus (GST_PIPELINE (play));
> gst_bus_add_watch (bus2, bus_call, loop);
> gst_object_unref (bus2);
>
> cout << "...PLAY" << endl;
>
> startPlay(play);
> GST_DEBUG_BIN_TO_DOT_FILE(GST_BIN(play),
> GST_DEBUG_GRAPH_SHOW_ALL,"audio2");
>
> /* now run */
> g_main_loop_run (loop);
>
> /* also clean up */
> gst_element_set_state (play, GST_STATE_NULL);
> gst_object_unref (GST_OBJECT (play));
> return 0;
> }
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/gstreamer-devel/attachments/20111113/a1dd387b/attachment-0001.htm>
More information about the gstreamer-devel
mailing list