mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-14 14:55:12 +01:00
289 lines
7.7 KiB
C
289 lines
7.7 KiB
C
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#include "osd.h"
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int seal_sample_rate = 44100;
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int seal_sound_card = -1;
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HAC hVoice[NUMVOICES];
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LPAUDIOWAVE lpWave[NUMVOICES];
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AUDIOINFO info;
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AUDIOCAPS caps;
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int c[MAX_STREAM_CHANNELS];
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int nominal_sample_rate;
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static int attenuation = 0;
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static int master_volume = 256;
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void osd_update_audio(void)
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{
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if (seal_sample_rate == 0) return;
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AUpdateAudio();
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}
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/* attenuation in dB */
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void osd_set_mastervolume(int _attenuation)
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{
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float volume;
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attenuation = _attenuation;
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volume = 256.0; /* range is 0-256 */
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while (_attenuation++ < 0)
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volume /= 1.122018454; /* = (10 ^ (1/20)) = 1dB */
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master_volume = volume;
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ASetAudioMixerValue(AUDIO_MIXER_MASTER_VOLUME,master_volume);
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}
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int msdos_init_sound(int *rate, int card)
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{
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int i;
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seal_sample_rate = *rate;
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seal_sound_card = card;
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if (AInitialize() != AUDIO_ERROR_NONE)
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return 1;
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/* Ask the user if no sound card was chosen */
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if (seal_sound_card == -1)
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{
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unsigned int k;
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printf("\n SELECT YOUR AUDIO DEVICE :\n\n"
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" AWE32/64 playback requires onboard DRAM,\n"
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" Sound Blaster playback is the most compatible & better for emulation\n\n");
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for (k = 0;k < AGetAudioNumDevs();k++)
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{
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if (AGetAudioDevCaps(k,&caps) == AUDIO_ERROR_NONE)
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printf(" %2d. %s\n",k,caps.szProductName);
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}
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printf("\n");
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if (k < 10)
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{
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i = getch();
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seal_sound_card = i - '0';
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}
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else
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scanf("%d",&seal_sound_card);
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}
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/* initialize SEAL audio library */
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if (seal_sound_card == 0) /* silence */
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{
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/* update the Machine structure to show that sound is disabled */
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seal_sample_rate = 0;
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exit(0);
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return 0;
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}
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/* open audio device */
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/* info.nDeviceId = AUDIO_DEVICE_MAPPER;*/
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info.nDeviceId = seal_sound_card;
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/* always use 16 bit mixing if possible - better quality and same speed of 8 bit */
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info.wFormat = AUDIO_FORMAT_16BITS | AUDIO_FORMAT_STEREO | AUDIO_FORMAT_RAW_SAMPLE;
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info.nSampleRate = seal_sample_rate;
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if (AOpenAudio(&info) != AUDIO_ERROR_NONE)
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{
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return (1);
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}
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AGetAudioDevCaps(info.nDeviceId,&caps);
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printf("Using `%s' at %d-bit %s %u Hz\n",
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caps.szProductName,
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info.wFormat & AUDIO_FORMAT_16BITS ? 16 : 8,
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info.wFormat & AUDIO_FORMAT_STEREO ? "stereo" : "mono",
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info.nSampleRate);
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/* open and allocate voices, allocate waveforms */
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if (AOpenVoices(NUMVOICES) != AUDIO_ERROR_NONE)
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{
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printf("voices initialization failed\n");
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return 1;
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}
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for (i = 0; i < NUMVOICES; i++)
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{
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if (ACreateAudioVoice(&hVoice[i]) != AUDIO_ERROR_NONE)
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{
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printf("voice #%d creation failed\n",i);
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return 1;
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}
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ASetVoicePanning(hVoice[i],128);
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lpWave[i] = 0;
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}
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/* update the Machine structure to reflect the actual sample rate */
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*rate = seal_sample_rate = info.nSampleRate;
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{
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uclock_t a,b;
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LONG start,end;
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if ((lpWave[0] = (LPAUDIOWAVE)malloc(sizeof(AUDIOWAVE))) == 0)
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return 1;
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lpWave[0]->wFormat = AUDIO_FORMAT_8BITS | AUDIO_FORMAT_MONO;
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lpWave[0]->nSampleRate = seal_sample_rate;
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lpWave[0]->dwLength = 3*seal_sample_rate;
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lpWave[0]->dwLoopStart = 0;
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lpWave[0]->dwLoopEnd = 3*seal_sample_rate;
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if (ACreateAudioData(lpWave[0]) != AUDIO_ERROR_NONE)
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{
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free(lpWave[0]);
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lpWave[0] = 0;
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return 1;
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}
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memset(lpWave[0]->lpData,0,3*seal_sample_rate);
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/* upload the data to the audio DRAM local memory */
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AWriteAudioData(lpWave[0],0,3*seal_sample_rate);
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APrimeVoice(hVoice[0],lpWave[0]);
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ASetVoiceFrequency(hVoice[0],seal_sample_rate);
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ASetVoiceVolume(hVoice[0],0);
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AStartVoice(hVoice[0]);
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a = uclock();
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/* wait some time to let everything stabilize */
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do
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{
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osd_update_audio();
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b = uclock();
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} while (b-a < UCLOCKS_PER_SEC/10);
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a = uclock();
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AGetVoicePosition(hVoice[0],&start);
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do
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{
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osd_update_audio();
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b = uclock();
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} while (b-a < UCLOCKS_PER_SEC);
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AGetVoicePosition(hVoice[0],&end);
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nominal_sample_rate = seal_sample_rate;
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seal_sample_rate = end - start;
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AStopVoice(hVoice[0]);
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ADestroyAudioData(lpWave[0]);
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free(lpWave[0]);
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lpWave[0] = 0;
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}
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osd_set_mastervolume(0); /* start at maximum volume */
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return 0;
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}
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void msdos_shutdown_sound(void)
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{
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if (seal_sample_rate != 0)
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{
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int n;
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/* stop and release voices */
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for (n = 0; n < NUMVOICES; n++)
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{
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AStopVoice(hVoice[n]);
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ADestroyAudioVoice(hVoice[n]);
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if (lpWave[n])
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{
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ADestroyAudioData(lpWave[n]);
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free(lpWave[n]);
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lpWave[n] = 0;
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}
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}
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ACloseVoices();
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ACloseAudio();
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}
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}
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void playstreamedsample(int channel,signed char *data,int len,int freq,int volume,int pan,int bits)
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{
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static int playing[NUMVOICES];
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static int c[NUMVOICES];
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/* backwards compatibility with old 0-255 volume range */
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if (volume > 100) volume = volume * 25 / 255;
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if (seal_sample_rate == 0 || channel >= NUMVOICES) return;
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if (!playing[channel])
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{
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if (lpWave[channel])
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{
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AStopVoice(hVoice[channel]);
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ADestroyAudioData(lpWave[channel]);
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free(lpWave[channel]);
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lpWave[channel] = 0;
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}
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if ((lpWave[channel] = (LPAUDIOWAVE)malloc(sizeof(AUDIOWAVE))) == 0)
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return;
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lpWave[channel]->wFormat = (bits == 8 ? AUDIO_FORMAT_8BITS : AUDIO_FORMAT_16BITS)
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| AUDIO_FORMAT_MONO | AUDIO_FORMAT_LOOP;
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lpWave[channel]->nSampleRate = nominal_sample_rate;
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lpWave[channel]->dwLength = 3*len;
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lpWave[channel]->dwLoopStart = 0;
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lpWave[channel]->dwLoopEnd = 3*len;
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if (ACreateAudioData(lpWave[channel]) != AUDIO_ERROR_NONE)
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{
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free(lpWave[channel]);
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lpWave[channel] = 0;
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return;
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}
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memset(lpWave[channel]->lpData,0,3*len);
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memcpy(lpWave[channel]->lpData,data,len);
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/* upload the data to the audio DRAM local memory */
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AWriteAudioData(lpWave[channel],0,3*len);
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APrimeVoice(hVoice[channel],lpWave[channel]);
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/* need to cast to double because freq*nominal_sample_rate can exceed the size of an int */
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ASetVoiceFrequency(hVoice[channel],(double)freq*nominal_sample_rate/seal_sample_rate);
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AStartVoice(hVoice[channel]);
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playing[channel] = 1;
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c[channel] = 1;
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}
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else
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{
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LONG pos;
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for(;;)
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{
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AGetVoicePosition(hVoice[channel],&pos);
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if (c[channel] == 0 && pos >= len) break;
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if (c[channel] == 1 && (pos < len || pos >= 2*len)) break;
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if (c[channel] == 2 && pos < 2*len) break;
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osd_update_audio();
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}
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memcpy(&lpWave[channel]->lpData[len * c[channel]],data,len);
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AWriteAudioData(lpWave[channel],len*c[channel],len);
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c[channel]++;
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if (c[channel] == 3) c[channel] = 0;
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}
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ASetVoiceVolume(hVoice[channel],volume * 64 / 100);
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ASetVoicePanning(hVoice[channel],(pan + 100) * 255 / 200);
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}
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void osd_play_streamed_sample_16(int channel,signed short *data,int len,int freq,int volume,int pan)
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{
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playstreamedsample(channel,(signed char *)data,len,freq,volume,pan,16);
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}
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