| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| /* Allow access to a raw mixing buffer */ |
| |
| #define WIN32_LEAN_AND_MEAN |
| #include <windows.h> |
| #include <mmsystem.h> |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audio_c.h" |
| #include "SDL_dibaudio.h" |
| #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
| #include "win_ce_semaphore.h" |
| #endif |
| |
| |
| /* Audio driver functions */ |
| static int DIB_OpenAudio(_THIS, SDL_AudioSpec * spec); |
| static void DIB_ThreadInit(_THIS); |
| static void DIB_WaitAudio(_THIS); |
| static Uint8 *DIB_GetAudioBuf(_THIS); |
| static void DIB_PlayAudio(_THIS); |
| static void DIB_WaitDone(_THIS); |
| static void DIB_CloseAudio(_THIS); |
| |
| /* Audio driver bootstrap functions */ |
| |
| static int |
| Audio_Available(void) |
| { |
| return (1); |
| } |
| |
| static void |
| Audio_DeleteDevice(SDL_AudioDevice * device) |
| { |
| SDL_free(device->hidden); |
| SDL_free(device); |
| } |
| |
| static SDL_AudioDevice * |
| Audio_CreateDevice(int devindex) |
| { |
| SDL_AudioDevice *this; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice)); |
| if (this) { |
| SDL_memset(this, 0, (sizeof *this)); |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| } |
| if ((this == NULL) || (this->hidden == NULL)) { |
| SDL_OutOfMemory(); |
| if (this) { |
| SDL_free(this); |
| } |
| return (0); |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| /* Set the function pointers */ |
| this->OpenAudio = DIB_OpenAudio; |
| this->ThreadInit = DIB_ThreadInit; |
| this->WaitAudio = DIB_WaitAudio; |
| this->PlayAudio = DIB_PlayAudio; |
| this->GetAudioBuf = DIB_GetAudioBuf; |
| this->WaitDone = DIB_WaitDone; |
| this->CloseAudio = DIB_CloseAudio; |
| |
| this->free = Audio_DeleteDevice; |
| |
| return this; |
| } |
| |
| AudioBootStrap WAVEOUT_bootstrap = { |
| "waveout", "Win95/98/NT/2000 WaveOut", |
| Audio_Available, Audio_CreateDevice |
| }; |
| |
| |
| /* The Win32 callback for filling the WAVE device */ |
| static void CALLBACK |
| FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance, |
| DWORD dwParam1, DWORD dwParam2) |
| { |
| SDL_AudioDevice *this = (SDL_AudioDevice *) dwInstance; |
| |
| /* Only service "buffer done playing" messages */ |
| if (uMsg != WOM_DONE) |
| return; |
| |
| /* Signal that we are done playing a buffer */ |
| #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
| ReleaseSemaphoreCE(audio_sem, 1, NULL); |
| #else |
| ReleaseSemaphore(audio_sem, 1, NULL); |
| #endif |
| } |
| |
| static void |
| SetMMerror(char *function, MMRESULT code) |
| { |
| size_t len; |
| char errbuf[MAXERRORLENGTH]; |
| #ifdef _WIN32_WCE |
| wchar_t werrbuf[MAXERRORLENGTH]; |
| #endif |
| |
| SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
| len = SDL_strlen(errbuf); |
| |
| #ifdef _WIN32_WCE |
| /* UNICODE version */ |
| waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH - len); |
| WideCharToMultiByte(CP_ACP, 0, werrbuf, -1, errbuf + len, |
| MAXERRORLENGTH - len, NULL, NULL); |
| #else |
| waveOutGetErrorText(code, errbuf + len, (UINT) (MAXERRORLENGTH - len)); |
| #endif |
| |
| SDL_SetError("%s", errbuf); |
| } |
| |
| /* Set high priority for the audio thread */ |
| static void |
| DIB_ThreadInit(_THIS) |
| { |
| SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST); |
| } |
| |
| void |
| DIB_WaitAudio(_THIS) |
| { |
| /* Wait for an audio chunk to finish */ |
| #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
| WaitForSemaphoreCE(audio_sem, INFINITE); |
| #else |
| WaitForSingleObject(audio_sem, INFINITE); |
| #endif |
| } |
| |
| Uint8 * |
| DIB_GetAudioBuf(_THIS) |
| { |
| Uint8 *retval; |
| |
| retval = (Uint8 *) (wavebuf[next_buffer].lpData); |
| return retval; |
| } |
| |
| void |
| DIB_PlayAudio(_THIS) |
| { |
| /* Queue it up */ |
| waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0])); |
| next_buffer = (next_buffer + 1) % NUM_BUFFERS; |
| } |
| |
| void |
| DIB_WaitDone(_THIS) |
| { |
| int i, left; |
| |
| do { |
| left = NUM_BUFFERS; |
| for (i = 0; i < NUM_BUFFERS; ++i) { |
| if (wavebuf[i].dwFlags & WHDR_DONE) { |
| --left; |
| } |
| } |
| if (left > 0) { |
| SDL_Delay(100); |
| } |
| } |
| while (left > 0); |
| } |
| |
| void |
| DIB_CloseAudio(_THIS) |
| { |
| int i; |
| |
| /* Close up audio */ |
| if (audio_sem) { |
| #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
| CloseSynchHandle(audio_sem); |
| #else |
| CloseHandle(audio_sem); |
| #endif |
| } |
| if (sound) { |
| waveOutClose(sound); |
| } |
| |
| /* Clean up mixing buffers */ |
| for (i = 0; i < NUM_BUFFERS; ++i) { |
| if (wavebuf[i].dwUser != 0xFFFF) { |
| waveOutUnprepareHeader(sound, &wavebuf[i], sizeof(wavebuf[i])); |
| wavebuf[i].dwUser = 0xFFFF; |
| } |
| } |
| /* Free raw mixing buffer */ |
| if (mixbuf != NULL) { |
| SDL_free(mixbuf); |
| mixbuf = NULL; |
| } |
| } |
| |
| int |
| DIB_OpenAudio(_THIS, SDL_AudioSpec * spec) |
| { |
| MMRESULT result; |
| int i; |
| WAVEFORMATEX waveformat; |
| |
| /* Initialize the wavebuf structures for closing */ |
| sound = NULL; |
| audio_sem = NULL; |
| for (i = 0; i < NUM_BUFFERS; ++i) |
| wavebuf[i].dwUser = 0xFFFF; |
| mixbuf = NULL; |
| |
| /* Set basic WAVE format parameters */ |
| SDL_memset(&waveformat, 0, sizeof(waveformat)); |
| waveformat.wFormatTag = WAVE_FORMAT_PCM; |
| |
| /* Determine the audio parameters from the AudioSpec */ |
| switch (spec->format & 0xFF) { |
| case 8: |
| /* Unsigned 8 bit audio data */ |
| spec->format = AUDIO_U8; |
| waveformat.wBitsPerSample = 8; |
| break; |
| case 16: |
| /* Signed 16 bit audio data */ |
| spec->format = AUDIO_S16; |
| waveformat.wBitsPerSample = 16; |
| break; |
| default: |
| SDL_SetError("Unsupported audio format"); |
| return (-1); |
| } |
| waveformat.nChannels = spec->channels; |
| waveformat.nSamplesPerSec = spec->freq; |
| waveformat.nBlockAlign = |
| waveformat.nChannels * (waveformat.wBitsPerSample / 8); |
| waveformat.nAvgBytesPerSec = |
| waveformat.nSamplesPerSec * waveformat.nBlockAlign; |
| |
| /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
| if (spec->samples < (spec->freq / 4)) |
| spec->samples = ((spec->freq / 4) + 3) & ~3; |
| |
| /* Update the fragment size as size in bytes */ |
| SDL_CalculateAudioSpec(spec); |
| |
| /* Open the audio device */ |
| result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat, |
| (DWORD_PTR) FillSound, (DWORD_PTR) this, |
| CALLBACK_FUNCTION); |
| if (result != MMSYSERR_NOERROR) { |
| SetMMerror("waveOutOpen()", result); |
| return (-1); |
| } |
| #ifdef SOUND_DEBUG |
| /* Check the sound device we retrieved */ |
| { |
| WAVEOUTCAPS caps; |
| |
| result = waveOutGetDevCaps((UINT) sound, &caps, sizeof(caps)); |
| if (result != MMSYSERR_NOERROR) { |
| SetMMerror("waveOutGetDevCaps()", result); |
| return (-1); |
| } |
| printf("Audio device: %s\n", caps.szPname); |
| } |
| #endif |
| |
| /* Create the audio buffer semaphore */ |
| #if defined(_WIN32_WCE) && (_WIN32_WCE < 300) |
| audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL); |
| #else |
| audio_sem = CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL); |
| #endif |
| if (audio_sem == NULL) { |
| SDL_SetError("Couldn't create semaphore"); |
| return (-1); |
| } |
| |
| /* Create the sound buffers */ |
| mixbuf = (Uint8 *) SDL_malloc(NUM_BUFFERS * spec->size); |
| if (mixbuf == NULL) { |
| SDL_SetError("Out of memory"); |
| return (-1); |
| } |
| for (i = 0; i < NUM_BUFFERS; ++i) { |
| SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i])); |
| wavebuf[i].lpData = (LPSTR) & mixbuf[i * spec->size]; |
| wavebuf[i].dwBufferLength = spec->size; |
| wavebuf[i].dwFlags = WHDR_DONE; |
| result = waveOutPrepareHeader(sound, &wavebuf[i], sizeof(wavebuf[i])); |
| if (result != MMSYSERR_NOERROR) { |
| SetMMerror("waveOutPrepareHeader()", result); |
| return (-1); |
| } |
| } |
| |
| /* Ready to go! */ |
| next_buffer = 0; |
| return (0); |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |