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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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0ee56888a8
Original commit message from CVS: Complete rewrite of the launcher. Now supports pretty arbitrary pipelines. Try '((fakesrc) ! identity ! (fakesink))' out. Doesn't seem to recognize pad names yet for some reason, so it goes with the first sink/src pad it finds in a given element. Other problems still remain, but the hard part is done with.
299 lines
9 KiB
C
299 lines
9 KiB
C
#include <glib.h>
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#include <gst/gst.h>
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#include <string.h>
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#include <stdlib.h>
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typedef struct _launch_delayed_pad launch_delayed_pad;
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struct _launch_delayed_pad {
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gchar *name;
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GstPad *peer;
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};
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void launch_newpad(GstElement *element,GstPad *pad,launch_delayed_pad *peer) {
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gst_info("have NEW_PAD signal\n");
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// if it matches, connect it
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if (!strcmp(gst_pad_get_name(pad),peer->name)) {
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gst_pad_connect(pad,peer->peer);
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gst_info("delayed connect of '%s' to '%s'\n",
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gst_pad_get_name(pad),gst_pad_get_name(peer->peer));
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}
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}
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// element ! [ element ! (element ! element )] ! element
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// 0 1 2 3 4 5 6 7 8 9 10 11
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// 0 1 2 3 4 5 8
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// 0 1 2 3 6
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guint bincount = 0;
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guint threadcount = 0;
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GHashTable *elementcounts;
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gchar *unique_name(gchar *type) {
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gint count;
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count = GPOINTER_TO_INT(g_hash_table_lookup(elementcounts,type));
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count++;
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g_hash_table_insert(elementcounts,type,GINT_TO_POINTER(count));
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return g_strdup_printf("%s%d",type,count-1);
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}
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gint parse_cmdline(int argc,char *argv[],GstBin *parent) {
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gint i = 0;
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gchar *arg;
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GstElement *element = NULL, *prevelement = NULL, *prevprevelement = NULL;
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gchar closingchar;
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gint len;
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gchar *ptr;
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gchar *sinkpadname = NULL, *srcpadname = NULL;
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GstPad *sinkpad = NULL, *srcpad = NULL;
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GList *pads;
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gint elementcount = 0;
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gint retval = 0;
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if (GST_IS_PIPELINE(parent)) closingchar = '\0',fprintf(stderr,"in pipeline ");
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else if (GST_IS_THREAD(parent)) closingchar = '}',fprintf(stderr,"in thread ");
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else closingchar = ')',fprintf(stderr,"in bin ");
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fprintf(stderr,"%s\n",gst_element_get_name (GST_ELEMENT (parent)));
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while (i < argc) {
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arg = argv[i];
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len = strlen(arg);
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element = NULL;
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fprintf(stderr,"** ARGUMENT is '%s'\n",arg);
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// a null that slipped through the reconstruction
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if (len == 0) {
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fprintf(stderr,"random arg, FIXME\n");
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i++;
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continue;
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// end of the container
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} else if (arg[0] == closingchar) {
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// time to finish off this bin
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fprintf(stderr,"exiting container %s\n",gst_element_get_name (GST_ELEMENT (parent)));
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retval = i+1;
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break;
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// a pad connection
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} else if ((ptr = strchr(arg,'!'))) {
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fprintf(stderr,"attempting to connect pads together....\n");
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// if it starts with the !
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if (arg[0] == '!') {
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srcpadname = NULL;
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// if there's a sinkpad...
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if (len > 1)
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sinkpadname = &arg[1];
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else
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sinkpadname = NULL;
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} else {
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srcpadname = g_strndup(arg,(ptr-arg));
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// if there's a sinkpad
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if (len > (ptr-arg)+1)
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sinkpadname = &ptr[1];
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else
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sinkpadname = NULL;
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}
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fprintf(stderr,"have sinkpad %s, srcpad %s\n",sinkpadname,srcpadname);
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srcpad = NULL;
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// if the srcpadname doesn't have any commas in it, find an actual pad
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if (!srcpadname || !strchr(srcpadname,',')) {
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if (srcpadname != NULL)
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srcpad = gst_element_get_pad(prevelement,srcpadname);
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if (!srcpad) {
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// check through the list to find the first sink pad
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pads = gst_element_get_pad_list(prevelement);
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while (pads) {
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srcpad = GST_PAD(pads->data);
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pads = g_list_next (pads);
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if (gst_pad_get_direction (srcpad) == GST_PAD_SRC) break;
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srcpad = NULL;
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}
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}
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if (!srcpad) fprintf(stderr,"error, can't find a src pad!!!\n");
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else fprintf(stderr,"have src pad %s:%s\n",GST_DEBUG_PAD_NAME(srcpad));
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}
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// element, or beginning of bin or thread
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} else {
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fprintf(stderr,"have element or bin/thread\n");
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// if we have a bin or thread starting
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if (strchr("({",arg[0])) {
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if (arg[0] == '(')
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// create a bin and add it to the current parent
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element = gst_bin_new(g_strdup_printf("bin%d",bincount++));
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else if (arg[0] == '{')
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// create a thread and add it to the current parent
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element = gst_thread_new(g_strdup_printf("thread%d",threadcount++));
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i += parse_cmdline(argc - i, argv + i + 1, GST_BIN (element));
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// else we have an element
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} else {
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fprintf(stderr,"attempting to create element '%s'\n",arg);
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element = gst_elementfactory_make(arg,unique_name(arg));
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fprintf(stderr,"created element %s\n",gst_element_get_name(element));
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}
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gst_bin_add (GST_BIN (parent), element);
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elementcount++;
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if (srcpad != NULL) {
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fprintf(stderr,"need to connect to sinkpad %s:%s\n",GST_DEBUG_PAD_NAME(srcpad));
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sinkpad = NULL;
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if (sinkpadname != NULL)
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sinkpad = gst_element_get_pad(prevelement,sinkpadname);
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if (!sinkpad) {
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// check through the list to find the first sink pad
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pads = gst_element_get_pad_list(element);
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while (pads) {
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sinkpad = GST_PAD(pads->data);
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pads = g_list_next (pads);
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if (gst_pad_get_direction (sinkpad) == GST_PAD_SINK) break;
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sinkpad = NULL;
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}
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}
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if (!sinkpad) fprintf(stderr,"error, can't find a sink pad!!!\n");
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else fprintf(stderr,"have sink pad %s:%s\n",GST_DEBUG_PAD_NAME(sinkpad));
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fprintf(stderr,"CONNECTING %s:%s and %s:%s\n",GST_DEBUG_PAD_NAME(srcpad),GST_DEBUG_PAD_NAME(sinkpad));
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gst_pad_connect(srcpad,sinkpad);
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sinkpad = NULL;
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srcpad = NULL;
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}
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// if we're the first element, ghost all the sinkpads
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if (elementcount == 1) {
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fprintf(stderr,"first element, ghosting all of %s's sink pads to parent %s\n",
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gst_element_get_name(element),gst_element_get_name(GST_ELEMENT(parent)));
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pads = gst_element_get_pad_list (element);
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while (pads) {
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sinkpad = GST_PAD (pads->data);
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pads = g_list_next (pads);
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if (!sinkpad) fprintf(stderr,"much oddness, pad doesn't seem to exist\n");
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else if (gst_pad_get_direction (sinkpad) == GST_PAD_SINK) {
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gst_element_add_ghost_pad (GST_ELEMENT (parent), sinkpad);
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fprintf(stderr,"ghosted %s:%s\n",GST_DEBUG_PAD_NAME(sinkpad));
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}
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}
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}
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}
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i++;
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prevelement = element;
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}
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// ghost all the src pads of the bin
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if (prevelement != NULL) {
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fprintf(stderr,"last element, ghosting all of %s's src pads to parent %s\n",
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gst_element_get_name(prevelement),gst_element_get_name(GST_ELEMENT(parent)));
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pads = gst_element_get_pad_list (prevelement);
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while (pads) {
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srcpad = GST_PAD (pads->data);
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pads = g_list_next (pads);
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if (!srcpad) fprintf(stderr,"much oddness, pad doesn't seem to exist\n");
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else if (gst_pad_get_direction (srcpad) == GST_PAD_SRC) {
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gst_element_add_ghost_pad (GST_ELEMENT (parent), srcpad);
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fprintf(stderr,"ghosted %s:%s\n",GST_DEBUG_PAD_NAME(srcpad));
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}
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}
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}
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if (retval) return retval;
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if (closingchar != '\0')
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fprintf(stderr,"returning IN THE WRONG PLACE\n");
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else fprintf(stderr,"ending pipeline\n");
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return i+1;
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}
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gint parse(int argc,char *argv[],GstBin *parent) {
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char **argvn;
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gchar *cmdline;
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gint newargc;
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gint len;
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int i,j,k;
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// make a null-terminated version of argv
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argvn = g_new0(char *,argc+1);
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memcpy(argvn,argv,sizeof(char*)*argc);
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// join the argvs together
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cmdline = g_strjoinv(" ",argvn);
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// free the null-terminated argv
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g_free(argvn);
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// first walk through quickly and see how many more slots we need
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len = strlen(cmdline);
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newargc = 1;
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for (i=0;i<len;i++) {
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// if it's a space, it denotes a new arg
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if (cmdline[i] == ' ') newargc++;
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// if it's a brace and isn't followed by a space, give it an arg
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if (strchr("([{}])",cmdline[i])) {
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// not followed by space, gets one
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if (cmdline[i+1] != ' ') newargc++;
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}
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}
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// now allocate the new argv array
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argvn = g_new0(char *,newargc+1);
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fprintf(stderr,"supposed to have %d args\n",newargc);
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// now attempt to construct the new arg list
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j = 0;k = 0;
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for (i=0;i<len+1;i++) {
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// if it's a delimiter
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if (strchr("([{}]) ",cmdline[i]) || (cmdline[i] == '\0')) {
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// extract the previous arg
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if (i-k > 0) {
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if (cmdline[k] == ' ') k++;
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argvn[j] = g_new0(char,(i-k)+1);
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memcpy(argvn[j],&cmdline[k],i-k);
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j++;
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}
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k = i;
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// if this is a bracket, construct a word
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if ((cmdline[i] != ' ') && (cmdline[i] != '\0')) {
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argvn[j++] = g_strdup_printf("%c",cmdline[i]);
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k++;
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}
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}
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}
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// print them out
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for (i=0;i<newargc;i++) {
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fprintf(stderr,"arg %d is: %s\n",i,argvn[i]);
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}
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// set up the elementcounts hash
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elementcounts = g_hash_table_new(g_str_hash,g_str_equal);
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return parse_cmdline(newargc,argvn,parent);
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}
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int main(int argc,char *argv[]) {
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GstElement *pipeline;
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gst_init(&argc,&argv);
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pipeline = gst_pipeline_new("launch");
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parse(argc-1,argv+1,GST_BIN (pipeline));
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gst_element_set_state(pipeline,GST_STATE_PLAYING);
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gst_bin_iterate (GST_BIN (pipeline));
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return 0;
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}
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