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libdragon
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Audio Subsystem. More...
Macros | |
| #define | NUM_BUFFERS 4 |
| Number of buffers the audio subsytem allocates and manages. | |
| #define | BUFFERS_PER_SECOND 25 |
| How many different audio buffers we want to schedule in one second. | |
| #define | CALC_BUFFER(x) ( ( ( ( x ) / BUFFERS_PER_SECOND ) >> 3 ) << 3 ) |
| Macro that calculates the size of a buffer based on frequency. More... | |
DAC rates for different regions | |
| #define | AI_NTSC_DACRATE 48681812 |
| NTSC DAC rate. | |
| #define | AI_PAL_DACRATE 49656530 |
| PAL DAC rate. | |
| #define | AI_MPAL_DACRATE 48628316 |
| MPAL DAC rate. | |
AI Status Register Values | |
| #define | AI_STATUS_BUSY ( 1 << 30 ) |
| Bit representing that the AI is busy. | |
| #define | AI_STATUS_FULL ( 1 << 31 ) |
| Bit representing that the AI is full. | |
Functions | |
| void | audio_init (const int frequency, int numbuffers) |
| Initialize the audio subsystem. More... | |
| void | audio_set_buffer_callback (audio_fill_buffer_callback fill_buffer_callback) |
| Install a audio callback to fill the audio buffer when required. More... | |
| void | audio_close () |
| Close the audio subsystem. More... | |
| void | audio_pause (bool pause) |
| Pause or resume audio playback. More... | |
| void | audio_write (const short *const buffer) |
| Write a chunk of audio data. More... | |
| short * | audio_write_begin (void) |
| Start writing to the first free internal buffer. More... | |
| void | audio_write_end (void) |
| Complete writing to an internal buffer. More... | |
| void | audio_write_silence () |
| Write a chunk of silence. More... | |
| volatile int | audio_can_write () |
| Return whether there is an empty buffer to write to. More... | |
| int | audio_get_frequency () |
| Return actual frequency of audio playback. More... | |
| int | audio_get_buffer_length () |
| Get the number of stereo samples that fit into an allocated buffer. More... | |
Audio Subsystem.
1.9.4