mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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d574ab8126
Original commit message from CVS: merge from EVENTS1 on 20011016
410 lines
11 KiB
C
410 lines
11 KiB
C
/*
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* mixer.c - stereo audio mixer - thomas@apestaart.org
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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 : 28/08/2001
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* trying to adapt to incsched
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* delayed start for channels > 1
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* now works by quickhacking the
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* adder plugin to set
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* GST_ELEMENT_COTHREAD_STOPPING
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* Version : 0.5.1
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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 WITH_BUG
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//#define WITH_BUG2
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//#define DEBUG
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//#define AUTOPLUG /* define if you want autoplugging of input channels */
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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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void env_register_cp (GstElement *volenv, double cp_time, double cp_level);
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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 GstCaps*
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gst_play_typefind (GstBin *bin, GstElement *element)
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{
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GstElement *typefind;
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GstElement *pipeline;
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GstCaps *caps = NULL;
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GST_DEBUG (0,"GstPipeline: typefind for element \"%s\"\n",
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GST_ELEMENT_NAME(element));
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pipeline = gst_pipeline_new ("autoplug_pipeline");
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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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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_bin_add (GST_BIN (pipeline), GST_ELEMENT (bin));
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gst_element_set_state (pipeline, 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 (GST_BIN (pipeline));
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gst_element_set_state (pipeline, 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_bin_remove (GST_BIN (pipeline), GST_ELEMENT (bin));
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gst_object_unref (GST_OBJECT (typefind));
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gst_object_unref (GST_OBJECT (pipeline));
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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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int i, j;
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int num_channels;
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gboolean done;
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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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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 == 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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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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/* create main bin */
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main_bin = gst_pipeline_new("bin");
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/* connect adder and output to bin */
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GST_INFO (0, "main: adding adder to bin");
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gst_bin_add (GST_BIN(main_bin), adder);
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GST_INFO (0, "main: adding audiosink to bin");
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gst_bin_add (GST_BIN(main_bin), audiosink);
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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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/* start looping */
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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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if (i > 1) gst_element_set_state (main_bin, GST_STATE_PAUSED);
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gst_bin_add (GST_BIN(main_bin), channel_in->pipe);
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/* request pads and connect to adder */
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GST_INFO (0, "requesting pad\n");
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pad = gst_element_request_pad_by_name (adder, "sink%d");
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printf ("\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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/* register a volume envelope */
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printf ("\tregistering volume envelope...\n");
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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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#ifndef GST_DISABLE_LOADSAVE
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xmlSaveFile("mixer.xml", gst_xml_write(GST_ELEMENT(main_bin)));
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#endif
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/* start playing */
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gst_element_set_state(main_bin, GST_STATE_PLAYING);
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// write out the schedule
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gst_schedule_show(GST_ELEMENT_SCHED(main_bin));
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playing = TRUE;
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j = 0;
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//printf ("main: start iterating from 0");
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while (playing && j < 100)
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{
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// printf ("main: iterating %d\n", j);
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gst_bin_iterate(GST_BIN(main_bin));
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//fprintf(stderr,"after iterate()\n");
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++j;
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}
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}
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printf ("main: all the channels are open\n");
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while (playing)
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{
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gst_bin_iterate(GST_BIN(main_bin));
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//fprintf(stderr,"after iterate()\n");
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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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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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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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GstElement *decoder;
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GST_DEBUG (0, "c_i_p : creating channel with id %d for file %s\n",
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id, location);
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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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GST_DEBUG (0, "c_i_p : creating pipeline\n");
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sprintf (buffer, "pipeline%d", id);
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channel->pipe = gst_bin_new (buffer);
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g_assert(channel->pipe != NULL);
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/* create elements */
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GST_DEBUG(0, "c_i_p : creating disksrc\n");
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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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GST_DEBUG(0, "c_i_p : setting location\n");
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g_object_set(G_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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g_signal_connect (G_OBJECT(channel->disksrc),"eos",
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G_CALLBACK(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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#ifdef WITH_BUG
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srccaps = gst_play_typefind (GST_BIN (channel->pipe), channel->disksrc);
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#endif
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#ifdef WITH_BUG2
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{
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GstElement *pipeline;
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pipeline = gst_pipeline_new ("autoplug_pipeline");
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gst_bin_add (GST_BIN (pipeline), channel->pipe);
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_bin_remove (GST_BIN (pipeline), channel->pipe);
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}
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#endif
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#ifdef AUTOPLUG
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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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#else
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new_element = gst_bin_new ("autoplug_bin");
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/* static plug, use mad plugin and assume mp3 input */
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printf ("using static plugging for input channel\n");
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decoder = gst_elementfactory_make ("mad", "mpg123");
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if (!decoder)
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{
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fprintf (stderr, "Could not get a decoder element !\n");
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exit (1);
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}
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gst_bin_add (GST_BIN (new_element), decoder);
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gst_element_add_ghost_pad (new_element,
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gst_element_get_pad (decoder, "sink"), "sink");
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gst_element_add_ghost_pad (new_element,
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gst_element_get_pad (decoder, "src"), "src_00");
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#endif
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#ifndef GST_DISABLE_LOADSAVE
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xmlSaveFile ("mixer.gst", gst_xml_write (new_element));
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#endif
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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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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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g_object_set(G_OBJECT(volenv), "controlpoint", buffer, NULL);
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}
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