Adding upstream version 0.3.65.upstream/0.3.65upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 186 insertions, 0 deletions

diff --git a/src/examples/audio-src.c b/src/examples/audio-src.c
new file mode 100644
index 0000000..1217732
--- /dev/null
+++ b/src/examples/audio-src.c
@@ -0,0 +1,186 @@
+/* PipeWire
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ [title]
+ Audio source using \ref pw_stream "pw_stream".
+ [title]
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <math.h>
+#include <signal.h>
+
+#include <spa/param/audio/format-utils.h>
+
+#include <pipewire/pipewire.h>
+
+#define M_PI_M2 ( M_PI + M_PI )
+
+#define DEFAULT_RATE		44100
+#define DEFAULT_CHANNELS	2
+#define DEFAULT_VOLUME		0.7
+
+struct data {
+	struct pw_main_loop *loop;
+	struct pw_stream *stream;
+
+	double accumulator;
+};
+
+static void fill_f32(struct data *d, void *dest, int n_frames)
+{
+	float *dst = dest, val;
+	int i, c;
+
+        for (i = 0; i < n_frames; i++) {
+                d->accumulator += M_PI_M2 * 440 / DEFAULT_RATE;
+                if (d->accumulator >= M_PI_M2)
+                        d->accumulator -= M_PI_M2;
+
+                val = sin(d->accumulator) * DEFAULT_VOLUME;
+                for (c = 0; c < DEFAULT_CHANNELS; c++)
+                        *dst++ = val;
+        }
+}
+
+/* our data processing function is in general:
+ *
+ *  struct pw_buffer *b;
+ *  b = pw_stream_dequeue_buffer(stream);
+ *
+ *  .. generate stuff in the buffer ...
+ *
+ *  pw_stream_queue_buffer(stream, b);
+ */
+static void on_process(void *userdata)
+{
+	struct data *data = userdata;
+	struct pw_buffer *b;
+	struct spa_buffer *buf;
+	int n_frames, stride;
+	uint8_t *p;
+
+	if ((b = pw_stream_dequeue_buffer(data->stream)) == NULL) {
+		pw_log_warn("out of buffers: %m");
+		return;
+	}
+
+	buf = b->buffer;
+	if ((p = buf->datas[0].data) == NULL)
+		return;
+
+	stride = sizeof(float) * DEFAULT_CHANNELS;
+	n_frames = SPA_MIN(b->requested, buf->datas[0].maxsize / stride);
+
+	fill_f32(data, p, n_frames);
+
+	buf->datas[0].chunk->offset = 0;
+	buf->datas[0].chunk->stride = stride;
+	buf->datas[0].chunk->size = n_frames * stride;
+
+	pw_stream_queue_buffer(data->stream, b);
+}
+
+static const struct pw_stream_events stream_events = {
+	PW_VERSION_STREAM_EVENTS,
+	.process = on_process,
+};
+
+static void do_quit(void *userdata, int signal_number)
+{
+	struct data *data = userdata;
+	pw_main_loop_quit(data->loop);
+}
+
+int main(int argc, char *argv[])
+{
+	struct data data = { 0, };
+	const struct spa_pod *params[1];
+	uint8_t buffer[1024];
+	struct pw_properties *props;
+	struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+
+	pw_init(&argc, &argv);
+
+	/* make a main loop. If you already have another main loop, you can add
+	 * the fd of this pipewire mainloop to it. */
+	data.loop = pw_main_loop_new(NULL);
+
+	pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGINT, do_quit, &data);
+	pw_loop_add_signal(pw_main_loop_get_loop(data.loop), SIGTERM, do_quit, &data);
+
+	/* Create a simple stream, the simple stream manages the core and remote
+	 * objects for you if you don't need to deal with them.
+	 *
+	 * If you plan to autoconnect your stream, you need to provide at least
+	 * media, category and role properties.
+	 *
+	 * Pass your events and a user_data pointer as the last arguments. This
+	 * will inform you about the stream state. The most important event
+	 * you need to listen to is the process event where you need to produce
+	 * the data.
+	 */
+	props = pw_properties_new(PW_KEY_MEDIA_TYPE, "Audio",
+			PW_KEY_MEDIA_CATEGORY, "Playback",
+			PW_KEY_MEDIA_ROLE, "Music",
+			NULL);
+	if (argc > 1)
+		/* Set stream target if given on command line */
+		pw_properties_set(props, PW_KEY_TARGET_OBJECT, argv[1]);
+	data.stream = pw_stream_new_simple(
+			pw_main_loop_get_loop(data.loop),
+			"audio-src",
+			props,
+			&stream_events,
+			&data);
+
+	/* Make one parameter with the supported formats. The SPA_PARAM_EnumFormat
+	 * id means that this is a format enumeration (of 1 value). */
+	params[0] = spa_format_audio_raw_build(&b, SPA_PARAM_EnumFormat,
+			&SPA_AUDIO_INFO_RAW_INIT(
+				.format = SPA_AUDIO_FORMAT_F32,
+				.channels = DEFAULT_CHANNELS,
+				.rate = DEFAULT_RATE ));
+
+	/* Now connect this stream. We ask that our process function is
+	 * called in a realtime thread. */
+	pw_stream_connect(data.stream,
+			  PW_DIRECTION_OUTPUT,
+			  PW_ID_ANY,
+			  PW_STREAM_FLAG_AUTOCONNECT |
+			  PW_STREAM_FLAG_MAP_BUFFERS |
+			  PW_STREAM_FLAG_RT_PROCESS,
+			  params, 1);
+
+	/* and wait while we let things run */
+	pw_main_loop_run(data.loop);
+
+	pw_stream_destroy(data.stream);
+	pw_main_loop_destroy(data.loop);
+	pw_deinit();
+
+	return 0;
+}