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@JonnyJD
Last active December 24, 2015 03:59
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Disc ID calculation with gstreamer
#include <stdlib.h>
#include <stdio.h>
#include <glib.h>
#include <gst/gst.h>
#include <gst/tag/tag.h>
#include <gst/audio/gstaudiocdsrc.h>
int main(void) {
GstElement *source, *pipeline, *sink;
GstBus *bus;
GstMessage *msg;
GstTagList *tags;
gchar *device;
gchar *discid = NULL;
gchar *discid_full = NULL;
char **hex_offsets;
int i, count;
gst_init(NULL, NULL);
printf("gstreamer version: %s\n", gst_version_string());
source = gst_element_make_from_uri(GST_URI_SRC, "cdda://", NULL, NULL);
pipeline = gst_pipeline_new(NULL);
sink = gst_element_factory_make("fakesink", NULL);
bus = gst_pipeline_get_bus(GST_PIPELINE (pipeline));
if (!source || !pipeline || !sink || !bus) {
fprintf(stderr, "aborted!\n");
return 1;
}
g_object_get(G_OBJECT (source), "device", &device, NULL);
g_print("device name: %s\n", device);
g_free(device);
gst_bin_add_many(GST_BIN (pipeline), source, sink, NULL);
gst_element_link(source, sink);
gst_element_set_state(pipeline, GST_STATE_PAUSED);
while(1) {
msg = gst_bus_pop(bus);
if (msg && GST_MESSAGE_TYPE (msg) == GST_MESSAGE_TAG) {
gst_message_parse_tag(msg, &tags);
gst_tag_list_get_string(tags,
GST_TAG_CDDA_MUSICBRAINZ_DISCID,
&discid);
gst_tag_list_get_string(tags,
GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL,
&discid_full);
if (tags) gst_tag_list_free(tags);
break;
}
if (msg) gst_message_unref(msg);
}
g_print("discid: %s\n", discid);
/* display discid_full in readable form (non-hex) */
hex_offsets = g_strsplit(discid_full, " ", 0);
count = g_strv_length(hex_offsets);
g_print("discid full: ");
for (i = 1; i < count; i++) {
g_print("%ld ", strtol(hex_offsets[i], 0, 16));
}
g_print("\n");
return 0;
}
CFLAGS=`pkg-config --cflags gstreamer-plugins-base-1.0`
LIBS=`pkg-config --libs gstreamer-plugins-base-1.0`
discid: discid.c
gcc -Wall $^ -o $@ $(CFLAGS) $(LIBS)
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