add alsa
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27
include/sound.hpp
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27
include/sound.hpp
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@ -0,0 +1,27 @@
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#ifndef GPU_SCREEN_RECORDER_H
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#define GPU_SCREEN_RECORDER_H
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typedef struct {
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void *handle;
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char *buffer;
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int buffer_size;
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unsigned int frames;
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} SoundDevice;
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/*
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Get a sound device by name, returning the device into the @device parameter.
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The device should be closed with @sound_device_close after it has been used
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to clean up internal resources.
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Returns 0 on success, or a negative value on failure.
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*/
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int sound_device_get_by_name(SoundDevice *device, const char *name = "default", unsigned int num_channels = 1, unsigned int period_frame_size = 32);
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int sound_device_close(SoundDevice *device);
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/*
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Returns the next chunk of audio into @buffer.
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Returns the size of the buffer, or a negative value on failure.
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*/
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int sound_device_read_next_chunk(SoundDevice *device, char **buffer);
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#endif /* GPU_SCREEN_RECORDER_H */
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@ -6,6 +6,7 @@ platforms = ["posix"]
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[config]
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include_dirs = ["/opt/cuda/targets/x86_64-linux/include"]
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libs = ["/usr/lib/libcuda.so"]
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[dependencies]
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ffnvcodec = ">=9"
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@ -21,3 +22,5 @@ xdamage = "1"
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# TODO: Remove this dependency, this is needed right now for glfwMakeContextCurrent
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glfw3 = "3"
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alsa = "1"
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84
src/sound.cpp
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84
src/sound.cpp
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#include "../include/sound.hpp"
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#include <stdlib.h>
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#include <stdio.h>
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#include <alsa/asoundlib.h>
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int sound_device_get_by_name(SoundDevice *device, const char *name, unsigned int num_channels, unsigned int period_frame_size) {
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int rc;
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snd_pcm_t *handle;
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rc = snd_pcm_open(&handle, name, SND_PCM_STREAM_CAPTURE, 0);
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if(rc < 0) {
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fprintf(stderr, "unable to open pcm device 'default', reason: %s\n", snd_strerror(rc));
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return rc;
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}
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snd_pcm_hw_params_t *params;
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snd_pcm_hw_params_alloca(¶ms);
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// Fill the params with default values
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snd_pcm_hw_params_any(handle, params);
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// Interleaved mode
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snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
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// Signed 16--bit little-endian format
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snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
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snd_pcm_hw_params_set_channels(handle, params, num_channels);
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// 44100 bits/second samling rate (CD quality)
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unsigned int val = 44100;
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int dir;
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snd_pcm_hw_params_set_rate_near(handle, params, &val, &dir);
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snd_pcm_uframes_t frames = period_frame_size;
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snd_pcm_hw_params_set_period_size_near(handle, params, &frames, &dir);
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// Write the parmeters to the driver
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rc = snd_pcm_hw_params(handle, params);
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if(rc < 0) {
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fprintf(stderr, "unable to set hw parameters, reason: %s\n", snd_strerror(rc));
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snd_pcm_close(handle);
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return rc;
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}
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// Use a buffer large enough to hold one period
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snd_pcm_hw_params_get_period_size(params, &frames, &dir);
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int buffer_size = frames * 2 * num_channels; // 2 bytes/sample, @num_channels channels
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char *buffer = (char*)malloc(buffer_size);
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if(!buffer) {
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fprintf(stderr, "failed to allocate buffer for audio\n");
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snd_pcm_close(handle);
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return -1;
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}
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device->handle = (void*)handle;
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device->buffer = buffer;
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device->buffer_size = buffer_size;
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device->frames = frames;
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return 0;
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}
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int sound_device_close(SoundDevice *device) {
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/* TODO: Is this also needed in @sound_device_get_by_name on failure? */
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snd_pcm_drain((snd_pcm_t*)device->handle);
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snd_pcm_close((snd_pcm_t*)device->handle);
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free(device->buffer);
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}
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int sound_device_read_next_chunk(SoundDevice *device, char **buffer) {
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int rc = snd_pcm_readi((snd_pcm_t*)device->handle, device->buffer, device->frames);
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if (rc == -EPIPE) {
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/* overrun */
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fprintf(stderr, "overrun occured\n");
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snd_pcm_prepare((snd_pcm_t*)device->handle);
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return 0;
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} else if(rc < 0) {
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fprintf(stderr, "failed to read from sound device, reason: %s\n", snd_strerror(rc));
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return rc;
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} else if (rc != (int)device->frames) {
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fprintf(stderr, "short read, read %d frames\n", rc);
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}
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*buffer = device->buffer;
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return rc;
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}
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