sheldonmlee/sdl-audio
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compare: sheldonmlee:e4895439fa4cc9e37a48bf3209d24412026f0c6d
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92d3e150cb ... e4895439fa

2 changed files with 64 additions and 79 deletions
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.gitignore vendored
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@ -1,6 +1,5 @@
obj/ obj/
main main
test
*.out *.out
logfile.txt logfile.txt

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