| /* |
| * Copyright 2007 The Android Open Source Project |
| * |
| * Audio output device. |
| */ |
| #include "Common.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <alsa/asoundlib.h> |
| |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <linux/input.h> |
| |
| |
| /* |
| * Input event device state. |
| */ |
| typedef struct AudioState { |
| snd_pcm_t *handle; |
| } AudioState; |
| |
| /* |
| * Set some stuff up. |
| */ |
| static int configureInitialState(const char* pathName, AudioState* audioState) |
| { |
| #if BUILD_SIM_WITHOUT_AUDIO |
| return 0; |
| #else |
| audioState->handle = NULL; |
| |
| snd_pcm_open(&audioState->handle, "default", SND_PCM_STREAM_PLAYBACK, 0); |
| |
| if (audioState->handle) { |
| snd_pcm_hw_params_t *params; |
| snd_pcm_hw_params_malloc(¶ms); |
| snd_pcm_hw_params_any(audioState->handle, params); |
| snd_pcm_hw_params_set_access(audioState->handle, params, SND_PCM_ACCESS_RW_INTERLEAVED); |
| snd_pcm_hw_params_set_format(audioState->handle, params, SND_PCM_FORMAT_S16_LE); |
| unsigned int rate = 44100; |
| snd_pcm_hw_params_set_rate_near(audioState->handle, params, &rate, NULL); |
| snd_pcm_hw_params_set_channels(audioState->handle, params, 2); |
| snd_pcm_hw_params(audioState->handle, params); |
| snd_pcm_hw_params_free(params); |
| } else { |
| wsLog("Couldn't open audio hardware, faking it\n"); |
| } |
| |
| return 0; |
| #endif |
| } |
| |
| /* |
| * Write audio data. |
| */ |
| static ssize_t writeAudio(FakeDev* dev, int fd, const void* buf, size_t count) |
| { |
| #if BUILD_SIM_WITHOUT_AUDIO |
| return 0; |
| #else |
| AudioState *state = (AudioState*)dev->state; |
| if (state->handle != NULL) { |
| snd_pcm_writei(state->handle, buf, count / 4); |
| return count; |
| } |
| |
| // fake timing |
| usleep(count * 10000 / (441 * 4)); |
| return count; |
| #endif |
| } |
| |
| /* |
| * Handle event ioctls. |
| */ |
| static int ioctlAudio(FakeDev* dev, int fd, int request, void* argp) |
| { |
| return -1; |
| } |
| |
| /* |
| * Free up our state before closing down the fake descriptor. |
| */ |
| static int closeAudio(FakeDev* dev, int fd) |
| { |
| #if BUILD_SIM_WITHOUT_AUDIO |
| return 0; |
| #else |
| AudioState *state = (AudioState*)dev->state; |
| snd_pcm_close(state->handle); |
| free(state); |
| dev->state = NULL; |
| return 0; |
| #endif |
| } |
| |
| /* |
| * Open an audio output device. |
| */ |
| FakeDev* wsOpenDevAudio(const char* pathName, int flags) |
| { |
| FakeDev* newDev = wsCreateFakeDev(pathName); |
| if (newDev != NULL) { |
| newDev->write = writeAudio; |
| newDev->ioctl = ioctlAudio; |
| newDev->close = closeAudio; |
| |
| AudioState* eventState = calloc(1, sizeof(AudioState)); |
| |
| if (configureInitialState(pathName, eventState) != 0) { |
| free(eventState); |
| return NULL; |
| } |
| newDev->state = eventState; |
| } |
| |
| return newDev; |
| } |