mirror of
https://github.com/Ryujinx/SDL.git
synced 2024-09-24 07:58:38 +02:00
9b64772775
- It's now always called if device->hidden isn't NULL, even if OpenDevice() failed halfway through. This lets implementation code not have to clean up itself on every possible failure point; just return an error and SDL will handle it for you. - Implementations can assume this->hidden != NULL and not check for it. - implementations don't have to set this->hidden = NULL when done, because the caller is always about to free(this). - Don't reset other fields that are in a block of memory about to be free()'d. - Implementations all now free things like internal mix buffers last, after closing devices and such, to guarantee they definitely aren't in use anymore at the point of deallocation.
349 lines
10 KiB
C
349 lines
10 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_AUDIO_DRIVER_WINMM
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/* Allow access to a raw mixing buffer */
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#include "../../core/windows/SDL_windows.h"
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#include <mmsystem.h>
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#include "SDL_timer.h"
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#include "SDL_audio.h"
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#include "../SDL_audio_c.h"
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#include "SDL_winmm.h"
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#ifndef WAVE_FORMAT_IEEE_FLOAT
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#define WAVE_FORMAT_IEEE_FLOAT 0x0003
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#endif
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#define DETECT_DEV_IMPL(iscap, typ, capstyp) \
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static void DetectWave##typ##Devs(void) { \
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const UINT iscapture = iscap ? 1 : 0; \
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const UINT devcount = wave##typ##GetNumDevs(); \
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capstyp caps; \
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UINT i; \
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for (i = 0; i < devcount; i++) { \
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if (wave##typ##GetDevCaps(i,&caps,sizeof(caps))==MMSYSERR_NOERROR) { \
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char *name = WIN_StringToUTF8(caps.szPname); \
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if (name != NULL) { \
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SDL_AddAudioDevice((int) iscapture, name, (void *) ((size_t) i+1)); \
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SDL_free(name); \
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} \
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} \
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} \
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}
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DETECT_DEV_IMPL(SDL_FALSE, Out, WAVEOUTCAPS)
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DETECT_DEV_IMPL(SDL_TRUE, In, WAVEINCAPS)
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static void
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WINMM_DetectDevices(void)
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{
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DetectWaveInDevs();
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DetectWaveOutDevs();
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}
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static void CALLBACK
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CaptureSound(HWAVEIN hwi, UINT uMsg, DWORD_PTR dwInstance,
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DWORD_PTR dwParam1, DWORD_PTR dwParam2)
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{
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SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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/* Only service "buffer is filled" messages */
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if (uMsg != WIM_DATA)
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return;
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/* Signal that we have a new buffer of data */
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ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
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}
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/* The Win32 callback for filling the WAVE device */
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static void CALLBACK
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FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
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DWORD_PTR dwParam1, DWORD_PTR dwParam2)
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{
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SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance;
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/* Only service "buffer done playing" messages */
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if (uMsg != WOM_DONE)
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return;
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/* Signal that we are done playing a buffer */
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ReleaseSemaphore(this->hidden->audio_sem, 1, NULL);
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}
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static int
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SetMMerror(char *function, MMRESULT code)
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{
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int len;
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char errbuf[MAXERRORLENGTH];
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wchar_t werrbuf[MAXERRORLENGTH];
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SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
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len = SDL_static_cast(int, SDL_strlen(errbuf));
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waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH - len);
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WideCharToMultiByte(CP_ACP, 0, werrbuf, -1, errbuf + len,
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MAXERRORLENGTH - len, NULL, NULL);
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return SDL_SetError("%s", errbuf);
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}
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static void
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WINMM_WaitDevice(_THIS)
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{
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/* Wait for an audio chunk to finish */
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WaitForSingleObject(this->hidden->audio_sem, INFINITE);
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}
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static Uint8 *
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WINMM_GetDeviceBuf(_THIS)
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{
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return (Uint8 *) (this->hidden->
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wavebuf[this->hidden->next_buffer].lpData);
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}
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static void
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WINMM_PlayDevice(_THIS)
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{
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/* Queue it up */
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waveOutWrite(this->hidden->hout,
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&this->hidden->wavebuf[this->hidden->next_buffer],
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sizeof(this->hidden->wavebuf[0]));
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this->hidden->next_buffer = (this->hidden->next_buffer + 1) % NUM_BUFFERS;
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}
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static void
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WINMM_WaitDone(_THIS)
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{
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int i, left;
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do {
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left = NUM_BUFFERS;
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for (i = 0; i < NUM_BUFFERS; ++i) {
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if (this->hidden->wavebuf[i].dwFlags & WHDR_DONE) {
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--left;
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}
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}
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if (left > 0) {
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SDL_Delay(100);
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}
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} while (left > 0);
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}
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static void
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WINMM_CloseDevice(_THIS)
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{
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int i;
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if (this->hidden->audio_sem) {
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CloseHandle(this->hidden->audio_sem);
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}
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/* Clean up mixing buffers */
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for (i = 0; i < NUM_BUFFERS; ++i) {
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if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
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waveOutUnprepareHeader(this->hidden->hout,
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&this->hidden->wavebuf[i],
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sizeof (this->hidden->wavebuf[i]));
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}
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}
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if (this->hidden->hin) {
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waveInClose(this->hidden->hin);
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}
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if (this->hidden->hout) {
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waveOutClose(this->hidden->hout);
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}
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SDL_free(this->hidden->mixbuf);
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SDL_free(this->hidden);
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}
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static SDL_bool
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PrepWaveFormat(_THIS, UINT devId, WAVEFORMATEX *pfmt, const int iscapture)
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{
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SDL_zerop(pfmt);
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if (SDL_AUDIO_ISFLOAT(this->spec.format)) {
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pfmt->wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
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} else {
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pfmt->wFormatTag = WAVE_FORMAT_PCM;
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}
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pfmt->wBitsPerSample = SDL_AUDIO_BITSIZE(this->spec.format);
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pfmt->nChannels = this->spec.channels;
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pfmt->nSamplesPerSec = this->spec.freq;
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pfmt->nBlockAlign = pfmt->nChannels * (pfmt->wBitsPerSample / 8);
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pfmt->nAvgBytesPerSec = pfmt->nSamplesPerSec * pfmt->nBlockAlign;
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if (iscapture) {
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return (waveInOpen(0, devId, pfmt, 0, 0, WAVE_FORMAT_QUERY) == 0);
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} else {
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return (waveOutOpen(0, devId, pfmt, 0, 0, WAVE_FORMAT_QUERY) == 0);
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}
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}
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static int
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WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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{
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SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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int valid_datatype = 0;
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MMRESULT result;
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WAVEFORMATEX waveformat;
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UINT devId = WAVE_MAPPER; /* WAVE_MAPPER == choose system's default */
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UINT i;
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if (handle != NULL) { /* specific device requested? */
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/* -1 because we increment the original value to avoid NULL. */
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const size_t val = ((size_t) handle) - 1;
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devId = (UINT) val;
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}
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/* Initialize all variables that we clean on shutdown */
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this->hidden = (struct SDL_PrivateAudioData *)
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SDL_malloc((sizeof *this->hidden));
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if (this->hidden == NULL) {
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return SDL_OutOfMemory();
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}
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SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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/* Initialize the wavebuf structures for closing */
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for (i = 0; i < NUM_BUFFERS; ++i)
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this->hidden->wavebuf[i].dwUser = 0xFFFF;
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if (this->spec.channels > 2)
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this->spec.channels = 2; /* !!! FIXME: is this right? */
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while ((!valid_datatype) && (test_format)) {
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switch (test_format) {
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case AUDIO_U8:
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case AUDIO_S16:
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case AUDIO_S32:
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case AUDIO_F32:
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this->spec.format = test_format;
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if (PrepWaveFormat(this, devId, &waveformat, iscapture)) {
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valid_datatype = 1;
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} else {
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test_format = SDL_NextAudioFormat();
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}
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break;
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default:
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test_format = SDL_NextAudioFormat();
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break;
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}
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}
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if (!valid_datatype) {
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return SDL_SetError("Unsupported audio format");
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}
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/* Update the fragment size as size in bytes */
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SDL_CalculateAudioSpec(&this->spec);
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/* Open the audio device */
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if (iscapture) {
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result = waveInOpen(&this->hidden->hin, devId, &waveformat,
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(DWORD_PTR) CaptureSound, (DWORD_PTR) this,
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CALLBACK_FUNCTION);
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} else {
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result = waveOutOpen(&this->hidden->hout, devId, &waveformat,
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(DWORD_PTR) FillSound, (DWORD_PTR) this,
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CALLBACK_FUNCTION);
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}
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if (result != MMSYSERR_NOERROR) {
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return SetMMerror("waveOutOpen()", result);
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}
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#ifdef SOUND_DEBUG
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/* Check the sound device we retrieved */
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{
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WAVEOUTCAPS caps;
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result = waveOutGetDevCaps((UINT) this->hidden->hout,
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&caps, sizeof(caps));
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if (result != MMSYSERR_NOERROR) {
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return SetMMerror("waveOutGetDevCaps()", result);
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}
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printf("Audio device: %s\n", caps.szPname);
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}
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#endif
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/* Create the audio buffer semaphore */
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this->hidden->audio_sem =
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CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
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if (this->hidden->audio_sem == NULL) {
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return SDL_SetError("Couldn't create semaphore");
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}
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/* Create the sound buffers */
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this->hidden->mixbuf =
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(Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
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if (this->hidden->mixbuf == NULL) {
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return SDL_OutOfMemory();
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}
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for (i = 0; i < NUM_BUFFERS; ++i) {
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SDL_memset(&this->hidden->wavebuf[i], 0,
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sizeof(this->hidden->wavebuf[i]));
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this->hidden->wavebuf[i].dwBufferLength = this->spec.size;
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this->hidden->wavebuf[i].dwFlags = WHDR_DONE;
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this->hidden->wavebuf[i].lpData =
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(LPSTR) & this->hidden->mixbuf[i * this->spec.size];
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result = waveOutPrepareHeader(this->hidden->hout,
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&this->hidden->wavebuf[i],
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sizeof(this->hidden->wavebuf[i]));
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if (result != MMSYSERR_NOERROR) {
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return SetMMerror("waveOutPrepareHeader()", result);
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}
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}
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return 0; /* Ready to go! */
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}
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static int
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WINMM_Init(SDL_AudioDriverImpl * impl)
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{
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/* Set the function pointers */
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impl->DetectDevices = WINMM_DetectDevices;
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impl->OpenDevice = WINMM_OpenDevice;
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impl->PlayDevice = WINMM_PlayDevice;
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impl->WaitDevice = WINMM_WaitDevice;
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impl->WaitDone = WINMM_WaitDone;
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impl->GetDeviceBuf = WINMM_GetDeviceBuf;
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impl->CloseDevice = WINMM_CloseDevice;
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return 1; /* this audio target is available. */
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}
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AudioBootStrap WINMM_bootstrap = {
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"winmm", "Windows Waveform Audio", WINMM_Init, 0
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};
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#endif /* SDL_AUDIO_DRIVER_WINMM */
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/* vi: set ts=4 sw=4 expandtab: */
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