oxmox
5342530c20
git-subtree-dir: src/dp_doom git-subtree-split: 190992421c7c643afc99d7f7c511c162f65bea85
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
#include "../ib_sound.h"
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#include <stddef.h>
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#include "SDL.h"
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/* The function that actually produces the output audio */
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static void (*audio_callback)(short* output_buffer, size_t frames_to_do, void *user_data);
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#if SDL_MAJOR_VERSION >= 2
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static SDL_AudioDeviceID audio_device;
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#endif
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static void Callback(void *user_data, Uint8 *output_buffer, int bytes_to_do)
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{
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const int frames_to_do = bytes_to_do / 2 / sizeof(short);
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audio_callback((short*)output_buffer, (size_t)frames_to_do, user_data);
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}
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int IB_StartupSound(void (*initial_callback)(unsigned int output_sample_rate, void *user_data), void (*_audio_callback)(short* output_buffer, size_t frames_to_do, void *user_data), void *user_data)
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{
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SDL_AudioSpec desired_audio_specification;
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#if SDL_MAJOR_VERSION >= 2
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SDL_AudioSpec obtained_audio_specification;
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#endif
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audio_callback = _audio_callback;
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if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
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{
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/* TODO: Error message. */
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}
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else
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{
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desired_audio_specification.freq = 48000;
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desired_audio_specification.format = AUDIO_S16;
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desired_audio_specification.channels = 2;
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desired_audio_specification.samples = 0x200; /* About 10ms at 48000Hz. */
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desired_audio_specification.callback = Callback;
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desired_audio_specification.userdata = user_data;
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#if SDL_MAJOR_VERSION >= 2
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/* With SDL2, we can use the native sample rate and buffer size. */
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audio_device = SDL_OpenAudioDevice(NULL, 0, &desired_audio_specification, &obtained_audio_specification, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE | SDL_AUDIO_ALLOW_SAMPLES_CHANGE);
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if (audio_device == 0)
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#else
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if (SDL_OpenAudio(&desired_audio_specification, NULL) < 0)
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#endif
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{
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/* TODO: Error message. */
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}
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else
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{
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#if SDL_MAJOR_VERSION >= 2
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initial_callback(obtained_audio_specification.freq, user_data);
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#else
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initial_callback(desired_audio_specification.freq, user_data);
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#endif
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#if SDL_MAJOR_VERSION >= 2
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SDL_PauseAudioDevice(audio_device, 0);
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#else
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SDL_PauseAudio(0);
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#endif
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return 1;
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}
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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}
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return 0;
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}
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void IB_ShutdownSound(void)
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{
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#if SDL_MAJOR_VERSION >= 2
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SDL_CloseAudioDevice(audio_device);
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#else
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SDL_CloseAudio();
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#endif
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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}
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void IB_LockSound(void)
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{
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#if SDL_MAJOR_VERSION >= 2
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SDL_LockAudioDevice(audio_device);
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#else
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SDL_LockAudio();
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#endif
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}
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void IB_UnlockSound(void)
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{
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#if SDL_MAJOR_VERSION >= 2
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SDL_UnlockAudioDevice(audio_device);
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#else
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SDL_UnlockAudio();
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#endif
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}
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