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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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bbb7ab7055
Original commit message from CVS: * cleaned up some code and integrated with new adder (mixer now works with different types of files)
317 lines
8.3 KiB
C
317 lines
8.3 KiB
C
/*
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* mixer.c - stereo audio mixer - thomas@apestaart.org
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* example based on helloworld by
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* demonstrates the adder plugin and the volume envelope plugin
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* work in progress but do try it out
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*
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* Latest change : 16/04/2001
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* mixer & adder plugin now work with variable-size input buffers
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* Version : 0.2
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*/
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#include <stdlib.h>
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#include <gst/gst.h>
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#include "mixer.h"
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#include <unistd.h>
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//#define DEBUG
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/* function prototypes */
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input_channel_t* create_input_channel (int id, char* location);
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void destroy_input_channel (input_channel_t *pipe);
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gboolean playing;
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/* eos will be called when the src element has an end of stream */
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void eos(GstElement *element)
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{
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g_print("have eos, quitting ?\n");
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// playing = FALSE;
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}
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static void
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gst_play_have_type (GstElement *sink, GstElement *sink2, gpointer data)
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{
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GST_DEBUG (0,"GstPipeline: play have type %p\n", (gboolean *)data);
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*(gboolean *)data = TRUE;
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}
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static GstCaps*
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gst_play_typefind (GstBin *bin, GstElement *element)
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{
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gboolean found = FALSE;
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GstElement *typefind;
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GstCaps *caps = NULL;
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GST_DEBUG (0,"GstPipeline: typefind for element \"%s\" %p\n",
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GST_ELEMENT_NAME(element), &found);
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typefind = gst_elementfactory_make ("typefind", "typefind");
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g_return_val_if_fail (typefind != NULL, FALSE);
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gtk_signal_connect (GTK_OBJECT (typefind), "have_type",
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GTK_SIGNAL_FUNC (gst_play_have_type), &found);
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gst_pad_connect (gst_element_get_pad (element, "src"),
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gst_element_get_pad (typefind, "sink"));
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gst_bin_add (bin, typefind);
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gst_element_set_state (GST_ELEMENT (bin), GST_STATE_PLAYING);
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// push a buffer... the have_type signal handler will set the found flag
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gst_bin_iterate (bin);
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gst_element_set_state (GST_ELEMENT (bin), GST_STATE_NULL);
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caps = gst_pad_get_caps (gst_element_get_pad (element, "src"));
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gst_pad_disconnect (gst_element_get_pad (element, "src"),
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gst_element_get_pad (typefind, "sink"));
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gst_bin_remove (bin, typefind);
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gst_object_unref (GST_OBJECT (typefind));
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return caps;
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}
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int main(int argc,char *argv[])
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{
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input_channel_t *channel_in1;
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input_channel_t *channel_in2;
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GstElement *main_bin;
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GstElement *adder;
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GstElement *audiosink;
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GstPad *pad; /* to request pads for the adder */
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gst_init(&argc,&argv);
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if (argc != 3) {
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g_print("usage: %s <filename1> <filename2>\n", argv[0]);
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exit(-1);
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}
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/* create input channels */
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channel_in1 = create_input_channel (1, argv[1]);
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channel_in2 = create_input_channel (2, argv[2]);
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/* create adder */
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adder = gst_elementfactory_make("adder", "adderel");
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/* create an audio sink */
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audiosink = gst_elementfactory_make("esdsink", "play_audio");
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/* now create main bin */
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main_bin = gst_bin_new("bin");
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gst_bin_add(GST_BIN(main_bin), channel_in1->pipe);
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gst_bin_add(GST_BIN(main_bin), channel_in2->pipe);
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gst_bin_add(GST_BIN(main_bin), adder);
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gst_bin_add(GST_BIN(main_bin), audiosink);
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/* request pads and connect to adder */
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pad = gst_element_request_pad_by_name (adder, "sink%d");
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g_print ("new pad %s\n", gst_pad_get_name (pad));
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gst_pad_connect (gst_element_get_pad (channel_in1->pipe, "channel1"), pad);
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pad = gst_element_request_pad_by_name (adder, "sink%d");
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g_print ("new pad %s\n", gst_pad_get_name (pad));
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gst_pad_connect (gst_element_get_pad (channel_in2->pipe, "channel2"), pad);
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/* connect adder and audiosink */
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gst_pad_connect(gst_element_get_pad(adder,"src"),
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gst_element_get_pad(audiosink,"sink"));
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/* register the volume envelope */
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "0:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "5:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "10:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "15:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "20:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "40:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in1->volenv), "controlpoint", "45:0.5", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "0:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "5:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "10:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "15:0.000001", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "20:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "40:1", NULL);
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gtk_object_set(GTK_OBJECT(channel_in2->volenv), "controlpoint", "45:0.5", NULL);
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/* sleep a few seconds */
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printf ("Sleeping a few seconds ...\n");
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sleep (2);
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printf ("Waking up ...\n");
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/* start playing */
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gst_element_set_state(main_bin, GST_STATE_PLAYING);
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playing = TRUE;
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while (playing) {
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gst_bin_iterate(GST_BIN(main_bin));
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}
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/* stop the bin */
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gst_element_set_state(main_bin, GST_STATE_NULL);
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destroy_input_channel (channel_in1);
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destroy_input_channel (channel_in2);
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gst_object_destroy(GST_OBJECT(audiosink));
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gst_object_destroy(GST_OBJECT(main_bin));
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exit(0);
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}
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input_channel_t*
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create_input_channel (int id, char* location)
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{
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/* create an input channel, reading from location
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* return a pointer to the channel
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* return NULL if failed
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*/
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input_channel_t *channel;
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char buffer[20]; /* hold the names */
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GstAutoplug *autoplug;
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GstCaps *srccaps;
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GstElement *new_element;
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : creating channel with id %d for file %s\n",
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id, location);
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#endif
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/* allocate channel */
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channel = (input_channel_t *) malloc (sizeof (input_channel_t));
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if (channel == NULL)
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{
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printf ("create_input_channel : could not allocate memory for channel !\n");
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return NULL;
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}
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/* create channel */
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : creating pipeline\n");
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#endif
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channel->pipe = gst_bin_new ("pipeline");
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g_assert(channel->pipe != NULL);
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/* create elements */
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : creating disksrc\n");
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#endif
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sprintf (buffer, "disksrc%d", id);
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channel->disksrc = gst_elementfactory_make ("disksrc", buffer);
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g_assert(channel->disksrc != NULL);
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gtk_object_set(GTK_OBJECT(channel->disksrc),"location", location, NULL);
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/* add disksrc to the bin before autoplug */
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gst_bin_add(GST_BIN(channel->pipe), channel->disksrc);
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/* connect signal to eos of disksrc */
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gtk_signal_connect(GTK_OBJECT(channel->disksrc),"eos",
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GTK_SIGNAL_FUNC(eos),NULL);
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : creating volume envelope\n");
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#endif
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sprintf (buffer, "volenv%d", id);
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channel->volenv = gst_elementfactory_make ("volenv", buffer);
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g_assert(channel->volenv != NULL);
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/* autoplug the pipe */
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : getting srccaps\n");
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#endif
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srccaps = gst_play_typefind (GST_BIN (channel->pipe), channel->disksrc);
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if (!srccaps) {
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g_print ("could not autoplug, unknown media type...\n");
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exit (-1);
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}
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : creating autoplug\n");
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#endif
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autoplug = gst_autoplugfactory_make ("static");
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g_assert (autoplug != NULL);
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : autoplugging\n");
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#endif
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new_element = gst_autoplug_to_caps (autoplug, srccaps,
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gst_caps_new ("audio", "audio/raw", NULL), NULL);
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if (!new_element) {
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g_print ("could not autoplug, no suitable codecs found...\n");
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exit (-1);
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}
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gst_bin_add (GST_BIN(channel->pipe), channel->volenv);
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gst_bin_add (GST_BIN (channel->pipe), new_element);
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gst_element_connect (channel->disksrc, "src", new_element, "sink");
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gst_element_connect (new_element, "src_00", channel->volenv, "sink");
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/* add a ghost pad */
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sprintf (buffer, "channel%d", id);
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gst_element_add_ghost_pad (channel->pipe,
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gst_element_get_pad (channel->volenv, "src"), buffer);
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#ifdef DEBUG
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printf ("DEBUG : c_i_p : end function\n");
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#endif
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return channel;
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}
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void
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destroy_input_channel (input_channel_t *channel)
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{
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/*
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* destroy an input channel
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*/
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#ifdef DEBUG
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printf ("DEBUG : d_i_p : start\n");
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#endif
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/* destroy elements */
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gst_object_destroy (GST_OBJECT (channel->pipe));
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free (channel);
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}
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