sheldonmlee/sdl-audio
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Better manage devices/memory management

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This commit is contained in:
Sheldon Lee 2024-10-13 14:06:35 +08:00
parent 9a0003059d
commit 92d3e150cb
1 changed files with 78 additions and 64 deletions
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142
main.c
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@ -8,7 +8,6 @@ const int SCREEN_HEIGHT = 480;
const int MAX_RECORDING_DEVICES = 10;
const int MAX_RECORDING_SECONDS = 1;
const int RECORDING_BUFFER_SECONDS = MAX_RECORDING_SECONDS + 1;
/*
* Application
*/
@ -60,15 +59,13 @@ SDL_AudioSpec received_playback_spec;
Uint8* recording_buffer = NULL;
unsigned int recording_buffer_size = 0;
unsigned int recording_buffer_position = 0;
unsigned int recording_buffer_position_max = 0;
SDL_AudioDeviceID audio_recording_init(int index, void* userdata);
SDL_AudioDeviceID audio_playback_init(void* userdata);
void audio_buffer_destroy();
SDL_AudioDeviceID audio_recording_init(int index);
SDL_AudioDeviceID audio_playback_init();
void audio_recording_callback( void* userdata, Uint8* stream, int len );
void audio_playback_callback( void* userdata, Uint8* stream, int len );
void handle_input(SDL_Event* event, state* state);
int handle_input(SDL_Event* event, state* state);
void handle_task(state* state);
int main(int argc, char* argv[])
{
@ -103,6 +100,22 @@ int main(int argc, char* argv[])
application_state_to_string(state.application_state, char_buffer);
text_texture_load(&state_text_texture, char_buffer);
SDL_zero(recording_spec);
recording_spec.freq = 44100;
recording_spec.format = AUDIO_S16;
recording_spec.channels = 2;
recording_spec.samples = 4096;
recording_spec.callback = audio_recording_callback;
recording_spec.userdata = &state;
SDL_zero(playback_spec);
playback_spec.freq = 44100;
playback_spec.format = AUDIO_S16;
playback_spec.channels = 2;
playback_spec.samples = 4096;
playback_spec.callback = audio_playback_callback;
playback_spec.userdata = &state;
SDL_Event event;
while (1) {
while (SDL_PollEvent(&event)) {
@ -114,7 +127,7 @@ int main(int argc, char* argv[])
break;
case SDL_KEYDOWN:
handle_input(&event, &state);
if (!handle_input(&event, &state)) goto cleanup;
break;
}
@ -150,7 +163,7 @@ int main(int argc, char* argv[])
}
cleanup:
printf("Cleanup");
printf("Cleanup\n");
SDL_CloseAudioDevice(state.recording_device_id);
SDL_CloseAudioDevice(state.playback_device_id);
text_texture_free(&display_text_texture);
@ -162,7 +175,7 @@ cleanup:
return 0;
}
void handle_input(SDL_Event* event, state* state)
int handle_input(SDL_Event* event, state* state)
{
SDL_Keycode keysym = event->key.keysym.sym;
switch (state->application_state) {
@ -171,23 +184,28 @@ void handle_input(SDL_Event* event, state* state)
switch (keysym) {
case SDLK_y:
case SDLK_RETURN:
if (state->recording_device_id)
SDL_CloseAudioDevice(state->recording_device_id);
state->recording_device_id = audio_recording_init(state->device_index, NULL);
/*if (state->recording_device_id)*/
/* SDL_CloseAudioDevice(state->recording_device_id);*/
/*state->recording_device_id = audio_recording_init(state->device_index, NULL);*/
if (state->device_index == -1 || !state->recording_device_id) break;
SDL_LockAudioDevice(state->recording_device_id);
memset(recording_buffer, 0, recording_buffer_size);
recording_buffer_position = 0;
SDL_UnlockAudioDevice(state->recording_device_id);
SDL_PauseAudioDevice(state->recording_device_id, 0);
state->application_state = RECORDING;
break;
case SDLK_q:
case SDLK_ESCAPE:
/*state->device_index = -1;*/
/*SDL_CloseAudioDevice(state->recording_device_id);*/
return 0;
break;
}
int device_index_new = select_device(&event->key, num_devices);
if (device_index_new == -1) break;
if (state->device_index != -1 && device_index_new == -1) break;
if (device_index_new == state->device_index) break;
state->device_index = device_index_new;
SDL_CloseAudioDevice(state->recording_device_id);
state->recording_device_id = audio_recording_init(state->device_index);
break;
@ -196,7 +214,6 @@ void handle_input(SDL_Event* event, state* state)
case SDLK_q:
case SDLK_ESCAPE:
SDL_PauseAudioDevice(state->recording_device_id, 1);
audio_buffer_destroy();
state->application_state = SELECTING_DEVICE;
break;
}
@ -206,16 +223,16 @@ void handle_input(SDL_Event* event, state* state)
switch (keysym) {
case SDLK_y:
case SDLK_RETURN:
if (state->playback_device_id)
SDL_CloseAudioDevice(state->playback_device_id);
state->playback_device_id = audio_playback_init(NULL);
if (!state->playback_device_id)
state->playback_device_id = audio_playback_init();
SDL_LockAudioDevice(state->playback_device_id);
recording_buffer_position = 0;
SDL_UnlockAudioDevice(state->playback_device_id);
SDL_PauseAudioDevice(state->playback_device_id, 0);
state->application_state = PLAYBACK;
break;
case SDLK_q:
case SDLK_ESCAPE:
audio_buffer_destroy();
state->application_state = SELECTING_DEVICE;
break;
}
@ -232,6 +249,7 @@ void handle_input(SDL_Event* event, state* state)
break;
}
return 1;
}
void handle_task(state* state)
@ -242,29 +260,17 @@ void handle_task(state* state)
break;
case RECORDING:
SDL_LockAudioDevice(state->recording_device_id);
if (recording_buffer_position >= recording_buffer_position_max) {
SDL_UnlockAudioDevice(state->recording_device_id);
SDL_CloseAudioDevice(state->recording_device_id);
if (recording_buffer_position >= recording_buffer_size)
state->application_state = RECORDED;
break;
}
SDL_UnlockAudioDevice(state->recording_device_id);
break;
case RECORDED:
break;
case PLAYBACK:
SDL_LockAudioDevice(state->playback_device_id);
if (recording_buffer_position >= recording_buffer_position_max) {
SDL_UnlockAudioDevice(state->playback_device_id);
SDL_CloseAudioDevice(state->playback_device_id);
if (recording_buffer_position >= recording_buffer_size)
state->application_state = RECORDED;
break;
}
SDL_UnlockAudioDevice(state->playback_device_id);
break;
}
}
@ -302,20 +308,6 @@ int init()
return 0;
}
SDL_zero(recording_spec);
recording_spec.freq = 44100;
recording_spec.format = AUDIO_S16;
recording_spec.channels = 2;
recording_spec.samples = 4096;
recording_spec.callback = audio_recording_callback;
SDL_zero(playback_spec);
playback_spec.freq = 44100;
playback_spec.format = AUDIO_S16;
playback_spec.channels = 2;
playback_spec.samples = 4096;
playback_spec.callback = audio_playback_callback;
return 1;
}
@ -432,7 +424,7 @@ int text_texture_free(text_texture* text_texture)
return 1;
}
SDL_AudioDeviceID audio_recording_init(int index, void* userdata)
SDL_AudioDeviceID audio_recording_init(int index)
{
SDL_AudioDeviceID device_id = SDL_OpenAudioDevice(SDL_GetAudioDeviceName(index, 1), 1, &recording_spec, &received_recording_spec, SDL_AUDIO_ALLOW_FORMAT_CHANGE);
printf("Recording Device: %s\n", SDL_GetAudioDeviceName(index, 1));
@ -443,16 +435,16 @@ SDL_AudioDeviceID audio_recording_init(int index, void* userdata)
unsigned int bytes_per_sample = received_recording_spec.channels * (SDL_AUDIO_BITSIZE(received_recording_spec.format)/8);
unsigned int bytes_per_second = received_recording_spec.freq * bytes_per_sample;
recording_buffer_size = RECORDING_BUFFER_SECONDS * bytes_per_second;
recording_buffer_position_max = MAX_RECORDING_SECONDS * bytes_per_second;
recording_buffer_size = MAX_RECORDING_SECONDS * bytes_per_second;
if (recording_buffer) free(recording_buffer);
recording_buffer = malloc(recording_buffer_size);
memset(recording_buffer, 0, recording_buffer_size);
return device_id;
}
SDL_AudioDeviceID audio_playback_init(void* userdata)
SDL_AudioDeviceID audio_playback_init()
{
if (!recording_buffer) {
printf("Audio buffer not initialized");
@ -475,28 +467,50 @@ int audio_device_stop(int device_id)
return 1;
}
void audio_buffer_destroy()
{
free(recording_buffer);
recording_buffer = NULL;
recording_buffer_size = 0;
recording_buffer_position = 0;
}
void audio_recording_callback(void* userdata, Uint8* stream, int len)
{
char string[64];
state* state = userdata;
int space_left = recording_buffer_size - recording_buffer_position;
if (space_left <= 0) {
sprintf(string, "Stopping recording ID: %i", state->recording_device_id);
log_message(LOG_INFO, string);
SDL_PauseAudioDevice(state->recording_device_id, 1);
return;
}
if (len > space_left) {
len = space_left;
}
memcpy(&recording_buffer[recording_buffer_position], stream, len);
recording_buffer_position += len;
char string[64];
sprintf(string, "Record pos: %u %u", recording_buffer_position, len);
sprintf(string, "Record pos: %u/%u (%u)", recording_buffer_position, recording_buffer_size, len);
log_message(LOG_INFO, string);
}
void audio_playback_callback(void* userdata, Uint8* stream, int len)
{
char string[64];
state* state = userdata;
int space_left = recording_buffer_size - recording_buffer_position;
if (space_left <= 0) {
sprintf(string, "Stopping playback ID: %i", state->recording_device_id);
log_message(LOG_INFO, string);
SDL_PauseAudioDevice(state->playback_device_id, 1);
return;
}
if (len > space_left) {
len = space_left;
}
memcpy(stream, &recording_buffer[recording_buffer_position], len);
recording_buffer_position += len;
char string[64];
sprintf(string, "Playback pos: %u %u", recording_buffer_position, len);
sprintf(string, "Playback pos: %u/%u (%u)", recording_buffer_position, recording_buffer_size, len);
log_message(LOG_INFO, string);
}