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mixer now works with variable inputs mixer creates custom volume envelopes allowing each song to play alone and end w...
Original commit message from CVS: * mixer now works with variable inputs * mixer creates custom volume envelopes allowing each song to play alone and end with a mix of all of them, undistorted
This commit is contained in:
Thomas Vander Stichele
parent
bbb7ab7055
commit
4ad674a2a2
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@ -1,12 +1,13 @@
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/*
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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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* example based on helloworld
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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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* multiple input channels allowed
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* volume envelope adapted
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* Version : 0.3
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*/
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#include <stdlib.h>
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@ -20,6 +21,7 @@
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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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void env_register_cp (GstElement *volenv, double cp_time, double cp_level);
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gboolean playing;
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@ -80,8 +82,14 @@ gst_play_typefind (GstBin *bin, GstElement *element)
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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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int i;
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int num_channels;
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char buffer[20];
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GList *input_channels; /* structure holding all the input channels */
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input_channel_t *channel_in;
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GstElement *main_bin;
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GstElement *adder;
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@ -91,68 +99,93 @@ int main(int argc,char *argv[])
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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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if (argc == 1) {
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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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num_channels = argc - 1;
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/* set up output channel and main bin */
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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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/* 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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/* connect adder and output to bin */
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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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/* create input channels, add to bin and connect */
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/* register the volume envelope */
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input_channels = NULL;
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for (i = 1; i < argc; ++i)
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{
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printf ("Opening channel %d from file %s...\n", i, argv[i]);
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channel_in = create_input_channel (i, argv[i]);
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input_channels = g_list_append (input_channels, channel_in);
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gst_bin_add(GST_BIN(main_bin), channel_in->pipe);
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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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/* 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 ("\tGot new adder sink pad %s\n", gst_pad_get_name (pad));
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sprintf (buffer, "channel%d", i);
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gst_pad_connect (gst_element_get_pad (channel_in->pipe, buffer), pad);
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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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/* register a volume envelope */
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printf ("\tregistering volume envelope...\n");
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/* sleep a few seconds */
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/*
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* this is the volenv :
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* each song gets a slot of 5 seconds, with a 5 second fadeout
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* at the end of that, all audio streams play simultaneously
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* at a level ensuring no distortion
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* example for three songs :
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* song1 : starts at full level, plays 5 seconds, faded out at 10 seconds,
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* sleep until 25, fade to end level at 30
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* song2 : starts silent, fades in at 5 seconds, full blast at 10 seconds,
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* full level until 15, faded out at 20, sleep until 25, fade to end at 30
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* song3 : starts muted, fades in from 15, full at 20, until 25, fade to end level
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*/
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if (i == 1)
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{
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/* first song gets special treatment for end style */
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env_register_cp (channel_in->volenv, 0.0, 1.0);
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}
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else
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{
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env_register_cp (channel_in->volenv, 0.0 , 0.0000001); /* start muted */
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env_register_cp (channel_in->volenv, i * 10.0 - 15.0, 0.0000001); /* start fade in */
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env_register_cp (channel_in->volenv, i * 10.0 - 10.0, 1.0);
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}
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env_register_cp (channel_in->volenv, i * 10.0 - 5.0, 1.0); /* end of full level */
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if (i != num_channels)
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{
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env_register_cp (channel_in->volenv, i * 10.0 , 0.0000001); /* fade to black */
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env_register_cp (channel_in->volenv, num_channels * 10.0 - 5.0, 0.0000001); /* start fade in */
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}
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env_register_cp (channel_in->volenv, num_channels * 10.0 , 1.0 / num_channels); /* to end level */
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}
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/* sleep a few seconds doesn't seem to help anyway */
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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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@ -166,8 +199,12 @@ int main(int argc,char *argv[])
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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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while (input_channels)
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{
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destroy_input_channel (input_channels->data);
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input_channels = g_list_next (input_channels);
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}
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g_list_free (input_channels);
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gst_object_destroy(GST_OBJECT(audiosink));
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@ -312,6 +349,12 @@ destroy_input_channel (input_channel_t *channel)
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free (channel);
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}
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void env_register_cp (GstElement *volenv, double cp_time, double cp_level)
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{
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char buffer[30];
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sprintf (buffer, "%f:%f", cp_time, cp_level);
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gtk_object_set(GTK_OBJECT(volenv), "controlpoint", buffer, NULL);
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}
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@ -1,12 +1,13 @@
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/*
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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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* example based on helloworld
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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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* multiple input channels allowed
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* volume envelope adapted
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* Version : 0.3
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*/
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#include <stdlib.h>
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@ -20,6 +21,7 @@
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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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void env_register_cp (GstElement *volenv, double cp_time, double cp_level);
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gboolean playing;
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@ -80,8 +82,14 @@ gst_play_typefind (GstBin *bin, GstElement *element)
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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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int i;
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int num_channels;
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char buffer[20];
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GList *input_channels; /* structure holding all the input channels */
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input_channel_t *channel_in;
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GstElement *main_bin;
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GstElement *adder;
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@ -91,68 +99,93 @@ int main(int argc,char *argv[])
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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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if (argc == 1) {
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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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num_channels = argc - 1;
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/* set up output channel and main bin */
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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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/* 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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/* connect adder and output to bin */
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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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/* create input channels, add to bin and connect */
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/* register the volume envelope */
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input_channels = NULL;
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for (i = 1; i < argc; ++i)
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{
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printf ("Opening channel %d from file %s...\n", i, argv[i]);
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channel_in = create_input_channel (i, argv[i]);
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input_channels = g_list_append (input_channels, channel_in);
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gst_bin_add(GST_BIN(main_bin), channel_in->pipe);
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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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/* 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 ("\tGot new adder sink pad %s\n", gst_pad_get_name (pad));
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sprintf (buffer, "channel%d", i);
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gst_pad_connect (gst_element_get_pad (channel_in->pipe, buffer), pad);
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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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/* register a volume envelope */
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printf ("\tregistering volume envelope...\n");
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/* sleep a few seconds */
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/*
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* this is the volenv :
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* each song gets a slot of 5 seconds, with a 5 second fadeout
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* at the end of that, all audio streams play simultaneously
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* at a level ensuring no distortion
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* example for three songs :
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* song1 : starts at full level, plays 5 seconds, faded out at 10 seconds,
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* sleep until 25, fade to end level at 30
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* song2 : starts silent, fades in at 5 seconds, full blast at 10 seconds,
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* full level until 15, faded out at 20, sleep until 25, fade to end at 30
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* song3 : starts muted, fades in from 15, full at 20, until 25, fade to end level
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*/
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if (i == 1)
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{
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/* first song gets special treatment for end style */
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env_register_cp (channel_in->volenv, 0.0, 1.0);
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}
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else
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{
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env_register_cp (channel_in->volenv, 0.0 , 0.0000001); /* start muted */
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env_register_cp (channel_in->volenv, i * 10.0 - 15.0, 0.0000001); /* start fade in */
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env_register_cp (channel_in->volenv, i * 10.0 - 10.0, 1.0);
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}
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env_register_cp (channel_in->volenv, i * 10.0 - 5.0, 1.0); /* end of full level */
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if (i != num_channels)
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{
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env_register_cp (channel_in->volenv, i * 10.0 , 0.0000001); /* fade to black */
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env_register_cp (channel_in->volenv, num_channels * 10.0 - 5.0, 0.0000001); /* start fade in */
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}
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env_register_cp (channel_in->volenv, num_channels * 10.0 , 1.0 / num_channels); /* to end level */
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}
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/* sleep a few seconds doesn't seem to help anyway */
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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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@ -166,8 +199,12 @@ int main(int argc,char *argv[])
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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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while (input_channels)
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{
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destroy_input_channel (input_channels->data);
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input_channels = g_list_next (input_channels);
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}
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g_list_free (input_channels);
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gst_object_destroy(GST_OBJECT(audiosink));
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@ -312,6 +349,12 @@ destroy_input_channel (input_channel_t *channel)
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free (channel);
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}
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void env_register_cp (GstElement *volenv, double cp_time, double cp_level)
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{
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char buffer[30];
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sprintf (buffer, "%f:%f", cp_time, cp_level);
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gtk_object_set(GTK_OBJECT(volenv), "controlpoint", buffer, NULL);
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}
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