1 files changed, 353 insertions, 0 deletions
diff --git a/src/output/plugins/WinmmOutputPlugin.cxx b/src/output/plugins/WinmmOutputPlugin.cxx
new file mode 100644
index 000000000..87861180f
--- /dev/null
+++ b/src/output/plugins/WinmmOutputPlugin.cxx
@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2003-2014 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 "WinmmOutputPlugin.hxx"
+#include "../OutputAPI.hxx"
+#include "pcm/PcmBuffer.hxx"
+#include "MixerList.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "util/Macros.hxx"
+
+#include <glib.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+struct WinmmBuffer {
+	PcmBuffer buffer;
+
+	WAVEHDR hdr;
+};
+
+struct WinmmOutput {
+	struct audio_output base;
+
+	UINT device_id;
+	HWAVEOUT handle;
+
+	/**
+	 * This event is triggered by Windows when a buffer is
+	 * finished.
+	 */
+	HANDLE event;
+
+	WinmmBuffer buffers[8];
+	unsigned next_buffer;
+};
+
+static constexpr Domain winmm_output_domain("winmm_output");
+
+HWAVEOUT
+winmm_output_get_handle(WinmmOutput *output)
+{
+	return output->handle;
+}
+
+static bool
+winmm_output_test_default_device(void)
+{
+	return waveOutGetNumDevs() > 0;
+}
+
+static bool
+get_device_id(const char *device_name, UINT *device_id, Error &error)
+{
+	/* if device is not specified use wave mapper */
+	if (device_name == nullptr) {
+		*device_id = WAVE_MAPPER;
+		return true;
+	}
+
+	UINT numdevs = waveOutGetNumDevs();
+
+	/* check for device id */
+	char *endptr;
+	UINT id = strtoul(device_name, &endptr, 0);
+	if (endptr > device_name && *endptr == 0) {
+		if (id >= numdevs)
+			goto fail;
+		*device_id = id;
+		return true;
+	}
+
+	/* check for device name */
+	for (UINT i = 0; i < numdevs; i++) {
+		WAVEOUTCAPS caps;
+		MMRESULT result = waveOutGetDevCaps(i, &caps, sizeof(caps));
+		if (result != MMSYSERR_NOERROR)
+			continue;
+		/* szPname is only 32 chars long, so it is often truncated.
+		   Use partial match to work around this. */
+		if (strstr(device_name, caps.szPname) == device_name) {
+			*device_id = i;
+			return true;
+		}
+	}
+
+fail:
+	error.Format(winmm_output_domain,
+		     "device \"%s\" is not found", device_name);
+	return false;
+}
+
+static struct audio_output *
+winmm_output_init(const config_param &param, Error &error)
+{
+	WinmmOutput *wo = new WinmmOutput();
+	if (!ao_base_init(&wo->base, &winmm_output_plugin, param, error)) {
+		delete wo;
+		return nullptr;
+	}
+
+	const char *device = param.GetBlockValue("device");
+	if (!get_device_id(device, &wo->device_id, error)) {
+		ao_base_finish(&wo->base);
+		delete wo;
+		return nullptr;
+	}
+
+	return &wo->base;
+}
+
+static void
+winmm_output_finish(struct audio_output *ao)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	ao_base_finish(&wo->base);
+	delete wo;
+}
+
+static bool
+winmm_output_open(struct audio_output *ao, AudioFormat &audio_format,
+		  Error &error)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	wo->event = CreateEvent(nullptr, false, false, nullptr);
+	if (wo->event == nullptr) {
+		error.Set(winmm_output_domain, "CreateEvent() failed");
+		return false;
+	}
+
+	switch (audio_format.format) {
+	case SampleFormat::S8:
+	case SampleFormat::S16:
+		break;
+
+	case SampleFormat::S24_P32:
+	case SampleFormat::S32:
+	case SampleFormat::FLOAT:
+	case SampleFormat::DSD:
+	case SampleFormat::UNDEFINED:
+		/* we havn't tested formats other than S16 */
+		audio_format.format = SampleFormat::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.GetFrameSize();
+	format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;
+	format.wBitsPerSample = audio_format.GetSampleSize() * 8;
+	format.cbSize = 0;
+
+	MMRESULT result = waveOutOpen(&wo->handle, wo->device_id, &format,
+				      (DWORD_PTR)wo->event, 0, CALLBACK_EVENT);
+	if (result != MMSYSERR_NOERROR) {
+		CloseHandle(wo->event);
+		error.Set(winmm_output_domain, "waveOutOpen() failed");
+		return false;
+	}
+
+	for (unsigned i = 0; i < ARRAY_SIZE(wo->buffers); ++i) {
+		memset(&wo->buffers[i].hdr, 0, sizeof(wo->buffers[i].hdr));
+	}
+
+	wo->next_buffer = 0;
+
+	return true;
+}
+
+static void
+winmm_output_close(struct audio_output *ao)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	for (unsigned i = 0; i < ARRAY_SIZE(wo->buffers); ++i)
+		wo->buffers[i].buffer.Clear();
+
+	waveOutClose(wo->handle);
+
+	CloseHandle(wo->event);
+}
+
+/**
+ * Copy data into a buffer, and prepare the wave header.
+ */
+static bool
+winmm_set_buffer(WinmmOutput *wo, WinmmBuffer *buffer,
+		 const void *data, size_t size,
+		 Error &error)
+{
+	void *dest = buffer->buffer.Get(size);
+	assert(dest != nullptr);
+
+	memcpy(dest, data, size);
+
+	memset(&buffer->hdr, 0, sizeof(buffer->hdr));
+	buffer->hdr.lpData = (LPSTR)dest;
+	buffer->hdr.dwBufferLength = size;
+
+	MMRESULT result = waveOutPrepareHeader(wo->handle, &buffer->hdr,
+					       sizeof(buffer->hdr));
+	if (result != MMSYSERR_NOERROR) {
+		error.Set(winmm_output_domain, result,
+			  "waveOutPrepareHeader() failed");
+		return false;
+	}
+
+	return true;
+}
+
+/**
+ * Wait until the buffer is finished.
+ */
+static bool
+winmm_drain_buffer(WinmmOutput *wo, WinmmBuffer *buffer,
+		   Error &error)
+{
+	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) {
+			error.Set(winmm_output_domain, result,
+				  "waveOutUnprepareHeader() failed");
+			return false;
+		}
+
+		/* wait some more */
+		WaitForSingleObject(wo->event, INFINITE);
+	}
+}
+
+static size_t
+winmm_output_play(struct audio_output *ao, const void *chunk, size_t size, Error &error)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	/* get the next buffer from the ring and prepare it */
+	WinmmBuffer *buffer = &wo->buffers[wo->next_buffer];
+	if (!winmm_drain_buffer(wo, buffer, error) ||
+	    !winmm_set_buffer(wo, buffer, chunk, size, error))
+		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));
+		error.Set(winmm_output_domain, result,
+			  "waveOutWrite() failed");
+		return 0;
+	}
+
+	/* mark our buffer as "used" */
+	wo->next_buffer = (wo->next_buffer + 1) %
+		ARRAY_SIZE(wo->buffers);
+
+	return size;
+}
+
+static bool
+winmm_drain_all_buffers(WinmmOutput *wo, Error &error)
+{
+	for (unsigned i = wo->next_buffer; i < ARRAY_SIZE(wo->buffers); ++i)
+		if (!winmm_drain_buffer(wo, &wo->buffers[i], error))
+			return false;
+
+	for (unsigned i = 0; i < wo->next_buffer; ++i)
+		if (!winmm_drain_buffer(wo, &wo->buffers[i], error))
+			return false;
+
+	return true;
+}
+
+static void
+winmm_stop(WinmmOutput *wo)
+{
+	waveOutReset(wo->handle);
+
+	for (unsigned i = 0; i < ARRAY_SIZE(wo->buffers); ++i) {
+		WinmmBuffer *buffer = &wo->buffers[i];
+		waveOutUnprepareHeader(wo->handle, &buffer->hdr,
+				       sizeof(buffer->hdr));
+	}
+}
+
+static void
+winmm_output_drain(struct audio_output *ao)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	if (!winmm_drain_all_buffers(wo, IgnoreError()))
+		winmm_stop(wo);
+}
+
+static void
+winmm_output_cancel(struct audio_output *ao)
+{
+	WinmmOutput *wo = (WinmmOutput *)ao;
+
+	winmm_stop(wo);
+}
+
+const struct audio_output_plugin winmm_output_plugin = {
+	"winmm",
+	winmm_output_test_default_device,
+	winmm_output_init,
+	winmm_output_finish,
+	nullptr,
+	nullptr,
+	winmm_output_open,
+	winmm_output_close,
+	nullptr,
+	nullptr,
+	winmm_output_play,
+	winmm_output_drain,
+	winmm_output_cancel,
+	nullptr,
+	&winmm_mixer_plugin,
+};