mpd/src/output/plugins/WinmmOutputPlugin.cxx

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/*
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* Copyright (C) 2003-2015 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"
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#include "WinmmOutputPlugin.hxx"
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#include "../OutputAPI.hxx"
#include "pcm/PcmBuffer.hxx"
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#include "mixer/MixerList.hxx"
#include "fs/AllocatedPath.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
#include "util/Macros.hxx"
#include "util/StringUtil.hxx"
#include <stdlib.h>
#include <string.h>
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struct WinmmBuffer {
PcmBuffer buffer;
WAVEHDR hdr;
};
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struct WinmmOutput {
AudioOutput base;
UINT device_id;
HWAVEOUT handle;
/**
* This event is triggered by Windows when a buffer is
* finished.
*/
HANDLE event;
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WinmmBuffer buffers[8];
unsigned next_buffer;
WinmmOutput()
:base(winmm_output_plugin) {}
};
static constexpr Domain winmm_output_domain("winmm_output");
static void
SetWaveOutError(Error &error, MMRESULT result, const char *prefix)
{
char buffer[256];
if (waveOutGetErrorTextA(result, buffer,
ARRAY_SIZE(buffer)) == MMSYSERR_NOERROR)
error.Format(winmm_output_domain, int(result),
"%s: %s", prefix, buffer);
else
error.Set(winmm_output_domain, int(result), prefix);
}
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HWAVEOUT
winmm_output_get_handle(WinmmOutput &output)
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{
return output.handle;
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}
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 */
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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) {
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if (id >= numdevs) {
error.Format(winmm_output_domain,
"device \"%s\" is not found",
device_name);
return false;
}
*device_id = id;
return true;
}
/* check for device name */
const AllocatedPath device_name_fs =
AllocatedPath::FromUTF8(device_name, error);
if (device_name_fs.IsNull())
return false;
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 (StringStartsWith(device_name_fs.c_str(), caps.szPname)) {
*device_id = i;
return true;
}
}
error.Format(winmm_output_domain,
"device \"%s\" is not found", device_name);
return false;
}
static AudioOutput *
winmm_output_init(const ConfigBlock &block, Error &error)
{
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WinmmOutput *wo = new WinmmOutput();
if (!wo->base.Configure(block, error)) {
delete wo;
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return nullptr;
}
const char *device = block.GetBlockValue("device");
if (!get_device_id(device, &wo->device_id, error)) {
delete wo;
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return nullptr;
}
return &wo->base;
}
static void
winmm_output_finish(AudioOutput *ao)
{
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WinmmOutput *wo = (WinmmOutput *)ao;
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delete wo;
}
static bool
winmm_output_open(AudioOutput *ao, AudioFormat &audio_format,
Error &error)
{
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WinmmOutput *wo = (WinmmOutput *)ao;
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wo->event = CreateEvent(nullptr, false, false, nullptr);
if (wo->event == nullptr) {
error.Set(winmm_output_domain, "CreateEvent() failed");
return false;
}
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switch (audio_format.format) {
case SampleFormat::S8:
case SampleFormat::S16:
break;
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case SampleFormat::S24_P32:
case SampleFormat::S32:
case SampleFormat::FLOAT:
case SampleFormat::DSD:
case SampleFormat::UNDEFINED:
/* we havn't tested formats other than S16 */
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audio_format.format = SampleFormat::S16;
break;
}
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if (audio_format.channels > 2)
/* same here: more than stereo was not tested */
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audio_format.channels = 2;
WAVEFORMATEX format;
format.wFormatTag = WAVE_FORMAT_PCM;
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format.nChannels = audio_format.channels;
format.nSamplesPerSec = audio_format.sample_rate;
format.nBlockAlign = audio_format.GetFrameSize();
format.nAvgBytesPerSec = format.nSamplesPerSec * format.nBlockAlign;
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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);
SetWaveOutError(error, result, "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(AudioOutput *ao)
{
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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
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winmm_set_buffer(WinmmOutput *wo, WinmmBuffer *buffer,
const void *data, size_t size,
Error &error)
{
void *dest = buffer->buffer.Get(size);
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assert(dest != nullptr);
memcpy(dest, data, size);
memset(&buffer->hdr, 0, sizeof(buffer->hdr));
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buffer->hdr.lpData = (LPSTR)dest;
buffer->hdr.dwBufferLength = size;
MMRESULT result = waveOutPrepareHeader(wo->handle, &buffer->hdr,
sizeof(buffer->hdr));
if (result != MMSYSERR_NOERROR) {
SetWaveOutError(error, result,
"waveOutPrepareHeader() failed");
return false;
}
return true;
}
/**
* Wait until the buffer is finished.
*/
static bool
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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) {
SetWaveOutError(error, result,
"waveOutUnprepareHeader() failed");
return false;
}
/* wait some more */
WaitForSingleObject(wo->event, INFINITE);
}
}
static size_t
winmm_output_play(AudioOutput *ao, const void *chunk, size_t size, Error &error)
{
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WinmmOutput *wo = (WinmmOutput *)ao;
/* get the next buffer from the ring and prepare it */
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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));
SetWaveOutError(error, 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
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winmm_stop(WinmmOutput *wo)
{
waveOutReset(wo->handle);
for (unsigned i = 0; i < ARRAY_SIZE(wo->buffers); ++i) {
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WinmmBuffer *buffer = &wo->buffers[i];
waveOutUnprepareHeader(wo->handle, &buffer->hdr,
sizeof(buffer->hdr));
}
}
static void
winmm_output_drain(AudioOutput *ao)
{
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WinmmOutput *wo = (WinmmOutput *)ao;
if (!winmm_drain_all_buffers(wo, IgnoreError()))
winmm_stop(wo);
}
static void
winmm_output_cancel(AudioOutput *ao)
{
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WinmmOutput *wo = (WinmmOutput *)ao;
winmm_stop(wo);
}
const struct AudioOutputPlugin winmm_output_plugin = {
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"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,
};