myvtm/Other/libaudioframework/audiostream.c

#include "precompile.h"
#include "audiostream.h"
#include "audiolog.h"
#include "audiocontext.h"

void audiostream_init(audioengine_t *engine, audiostream_vtbl_t *vtbl, audiostream_t *stream)
{
	stream->vtbl = vtbl;
	stream->engine = engine;
	stream->ctx = NULL;
	stream->direction = STREAM_DIR_NONE;
	stream->user_data = NULL;
	stream->event_handler = NULL;
	stream->upstream = stream->downstream = NULL;
}

void audiostream_raise_event(audiostream_t *stream, int evt, int param1, int param2)
{
	apr_status_t status;
	audiostream_t *p;
	if (stream->event_handler) {
		if ((*stream->event_handler)(stream, stream->user_data, evt, param1, param2))
			return;
	}
	p = stream;
	while (p) {
		if (p->ctx) {
			status = audiocontext_put_stream_event(p->ctx, stream, evt, param1, param2);
			if (status != APR_SUCCESS) {
				AUDIO_LOG_ERROR("put stream event failed");
			}
			break;
		}
		p = p->upstream;
	}
}

audiostream_t* audiostream_connect_pipeline(int direction, ...)
{
	va_list arg;
	audiostream_t *first = NULL;
	audiostream_t *upstream = NULL;
	audiostream_t *downstream = NULL;

	va_start(arg, direction);
	for (;;) {
		audiostream_t *st = va_arg(arg, audiostream_t*);
		if (st) {
			if (!first) {
				first = st;
				first->direction = direction;
			}
			if (upstream) {
				st->upstream = upstream;
				upstream->downstream = st;
			}
			upstream = st;
		} else {
			break;
		}
	}
	va_end(arg);

	return first;
}

void audiostream_disconnect_pipeline(audiostream_t *stream)
{
	audiostream_t *s;

	s = stream;
	while (s) {
		audiostream_t *next = s->downstream;
		s->upstream = NULL;
		s->downstream = NULL;
		s->direction = STREAM_DIR_NONE;
		s = next;
	}
}