output/win32: new output plugin for Windows Wave

2 files changed, 300 insertions, 0 deletions

diff --git a/src/output/win32_output_plugin.c b/src/output/win32_output_plugin.c
new file mode 100644
index 000000000..970c62d79
--- /dev/null
+++ b/src/output/win32_output_plugin.c
@@ -0,0 +1,296 @@
+/*
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "output_api.h"
+#include "pcm_buffer.h"
+
+#include <windows.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "win32_output"
+
+struct win32_buffer {
+	struct pcm_buffer buffer;
+
+	WAVEHDR hdr;
+};
+
+struct win32_output {
+	HWAVEOUT handle;
+
+	/**
+	 * This event is triggered by Windows when a buffer is
+	 * finished.
+	 */
+	HANDLE event;
+
+	struct win32_buffer buffers[8];
+	unsigned next_buffer;
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+win32_output_quark(void)
+{
+	return g_quark_from_static_string("win32_output");
+}
+
+static bool
+win32_output_test_default_device(void)
+{
+	/* we assume that Wave is always available */
+	return true;
+}
+
+static void *
+win32_output_init(G_GNUC_UNUSED const struct audio_format *audio_format,
+		  G_GNUC_UNUSED const struct config_param *param,
+		  G_GNUC_UNUSED GError **error)
+{
+	struct win32_output *wo = g_new(struct win32_output, 1);
+
+	return wo;
+}
+
+static void
+win32_output_finish(void *data)
+{
+	struct win32_output *wo = data;
+
+	g_free(wo);
+}
+
+static bool
+win32_output_open(void *data, struct audio_format *audio_format,
+		  GError **error_r)
+{
+	struct win32_output *wo = data;
+
+	wo->event = CreateEvent(NULL, false, false, NULL);
+	if (wo->event == NULL) {
+		g_set_error(error_r, win32_output_quark(), 0,
+			    "CreateEvent() failed");
+		return false;
+	}
+
+	switch (audio_format->format) {
+	case SAMPLE_FORMAT_S8:
+	case SAMPLE_FORMAT_S16:
+		break;
+
+	case SAMPLE_FORMAT_S24:
+	case SAMPLE_FORMAT_S24_P32:
+	case SAMPLE_FORMAT_S32:
+	case SAMPLE_FORMAT_UNDEFINED:
+		/* we havn't tested formats other than S16 */
+		audio_format->format = SAMPLE_FORMAT_S16;
+		break;
+	}
+
+	if (audio_format->channels > 2)
+		/* same here: more than stereo was not tested */
+		audio_format->channels = 2;
+
+	WAVEFORMATEX format;
+	format.wFormatTag = WAVE_FORMAT_PCM;
+	format.nChannels = audio_format->channels;
+	format.nSamplesPerSec = audio_format->sample_rate;
+	format.nBlockAlign = audio_format_frame_size(audio_format);
+	format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;
+	format.wBitsPerSample = audio_format_sample_size(audio_format) * 8;
+	format.cbSize = 0;
+
+	MMRESULT result = waveOutOpen(&wo->handle, WAVE_MAPPER, &format,
+				      (DWORD_PTR)wo->event, 0, CALLBACK_EVENT);
+	if (result != MMSYSERR_NOERROR) {
+		CloseHandle(wo->event);
+		g_set_error(error_r, win32_output_quark(), result,
+			    "waveOutOpen() failed");
+		return false;
+	}
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(wo->buffers); ++i) {
+		pcm_buffer_init(&wo->buffers[i].buffer);
+		memset(&wo->buffers[i].hdr, 0, sizeof(wo->buffers[i].hdr));
+	}
+
+	wo->next_buffer = 0;
+
+	return true;
+}
+
+static void
+win32_output_close(void *data)
+{
+	struct win32_output *wo = data;
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(wo->buffers); ++i)
+		pcm_buffer_deinit(&wo->buffers[i].buffer);
+
+	waveOutClose(wo->handle);
+
+	CloseHandle(wo->event);
+}
+
+/**
+ * Copy data into a buffer, and prepare the wave header.
+ */
+static bool
+win32_set_buffer(struct win32_output *wo, struct win32_buffer *buffer,
+		 const void *data, size_t size,
+		 GError **error_r)
+{
+	void *dest = pcm_buffer_get(&buffer->buffer, size);
+	if (dest == NULL) {
+		g_set_error(error_r, win32_output_quark(), 0,
+			    "Out of memory");
+		return false;
+	}
+
+	memcpy(dest, data, size);
+
+	memset(&buffer->hdr, 0, sizeof(buffer->hdr));
+	buffer->hdr.lpData = dest;
+	buffer->hdr.dwBufferLength = size;
+
+	MMRESULT result = waveOutPrepareHeader(wo->handle, &buffer->hdr,
+					       sizeof(buffer->hdr));
+	if (result != MMSYSERR_NOERROR) {
+		g_set_error(error_r, win32_output_quark(), result,
+			    "waveOutPrepareHeader() failed");
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * Wait until the buffer is finished.
+ */
+static bool
+win32_drain_buffer(struct win32_output *wo, struct win32_buffer *buffer,
+		   GError **error_r)
+{
+	if ((buffer->hdr.dwFlags & WHDR_DONE) == WHDR_DONE)
+		/* already finished */
+		return true;
+
+	while (true) {
+		MMRESULT result = waveOutUnprepareHeader(wo->handle,
+							 &buffer->hdr,
+							 sizeof(buffer->hdr));
+		if (result == MMSYSERR_NOERROR)
+			return true;
+		else if (result != WAVERR_STILLPLAYING) {
+			g_set_error(error_r, win32_output_quark(), result,
+				    "waveOutUnprepareHeader() failed");
+			return false;
+		}
+
+		/* wait some more */
+		WaitForSingleObject(wo->event, INFINITE);
+	}
+}
+
+static size_t
+win32_output_play(void *data, const void *chunk, size_t size, GError **error_r)
+{
+	struct win32_output *wo = data;
+
+	/* get the next buffer from the ring and prepare it */
+	struct win32_buffer *buffer = &wo->buffers[wo->next_buffer];
+	if (!win32_drain_buffer(wo, buffer, error_r) ||
+	    !win32_set_buffer(wo, buffer, chunk, size, error_r))
+		return 0;
+
+	/* enqueue the buffer */
+	MMRESULT result = waveOutWrite(wo->handle, &buffer->hdr,
+				       sizeof(buffer->hdr));
+	if (result != MMSYSERR_NOERROR) {
+		waveOutUnprepareHeader(wo->handle, &buffer->hdr,
+				       sizeof(buffer->hdr));
+		g_set_error(error_r, win32_output_quark(), result,
+			    "waveOutWrite() failed");
+		return 0;
+	}
+
+	/* mark our buffer as "used" */
+	wo->next_buffer = (wo->next_buffer + 1) %
+		G_N_ELEMENTS(wo->buffers);
+
+	return size;
+}
+
+static bool
+win32_drain_all_buffers(struct win32_output *wo, GError **error_r)
+{
+	for (unsigned i = wo->next_buffer; i < G_N_ELEMENTS(wo->buffers); ++i)
+		if (!win32_drain_buffer(wo, &wo->buffers[i], error_r))
+			return false;
+
+	for (unsigned i = 0; i < wo->next_buffer; ++i)
+		if (!win32_drain_buffer(wo, &wo->buffers[i], error_r))
+			return false;
+
+	return true;
+}
+
+static void
+win32_stop(struct win32_output *wo)
+{
+	waveOutReset(wo->handle);
+
+	for (unsigned i = 0; i < G_N_ELEMENTS(wo->buffers); ++i) {
+		struct win32_buffer *buffer = &wo->buffers[i];
+		waveOutUnprepareHeader(wo->handle, &buffer->hdr,
+				       sizeof(buffer->hdr));
+	}
+}
+
+static void
+win32_output_drain(void *data)
+{
+	struct win32_output *wo = data;
+
+	if (!win32_drain_all_buffers(wo, NULL))
+		win32_stop(wo);
+}
+
+static void
+win32_output_cancel(void *data)
+{
+	struct win32_output *wo = data;
+
+	win32_stop(wo);
+}
+
+const struct audio_output_plugin win32_output_plugin = {
+	.name = "win32",
+	.test_default_device = win32_output_test_default_device,
+	.init = win32_output_init,
+	.finish = win32_output_finish,
+	.open = win32_output_open,
+	.close = win32_output_close,
+	.play = win32_output_play,
+	.drain = win32_output_drain,
+	.cancel = win32_output_cancel,
+};
diff --git a/src/output_list.c b/src/output_list.c
index d94749e86..c5fd05b1d 100644
--- a/src/output_list.c
+++ b/src/output_list.c
@@ -36,6 +36,7 @@ extern const struct audio_output_plugin mvp_output_plugin;
 extern const struct audio_output_plugin jack_output_plugin;
 extern const struct audio_output_plugin httpd_output_plugin;
 extern const struct audio_output_plugin recorder_output_plugin;
+extern const struct audio_output_plugin win32_output_plugin;
 
 const struct audio_output_plugin *audio_output_plugins[] = {
 #ifdef HAVE_SHOUT
@@ -81,6 +82,9 @@ const struct audio_output_plugin *audio_output_plugins[] = {
 #ifdef ENABLE_RECORDER_OUTPUT
 	&recorder_output_plugin,
 #endif
+#ifdef ENABLE_WIN32_OUTPUT
+	&win32_output_plugin,
+#endif
 	NULL
 };