audio.cpp File Reference

Audio and alsa module class. More...

#include <chrono>
#include <cmath>
#include <cstdint>
#include <mutex>
#include <vector>
#include <alsa/asoundlib.h>
#include <libavcodec/avcodec.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/channel_layout.h>
#include <libavutil/opt.h>
#include "audio.h"
#include "config.h"
#include "event.h"
#include "filllevel.h"
#include "logger.h"
#include "misc.h"
#include "pidcontroller.h"
#include "ringbuffer.h"
#include "softhddevice.h"
#include "threads.h"

Go to the source code of this file.

Functions
static void	ReorderAudioFrame (uint16_t *buf, int size, int channels)
	Reorder audio frame.
static void	AlsaNoopCallback (__attribute__((unused)) const char *file, __attribute__((unused)) int line, __attribute__((unused)) const char *function, __attribute__((unused)) int err, __attribute__((unused)) const char *fmt,...)
	Empty log callback.

Detailed Description

Audio and alsa module class.

This file defines cSoftHdAudio , which holds all functions we need to deal with audio, e.g.handling the audio stream and sending it to hardware.

Copyright

(c) 2009 - 2014 by Johns. All Rights Reserved.

(c) 2018 by zille. All Rights Reserved.

(c) 2025 by Andreas Baierl. All Rights Reserved.

License

AGPLv3

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

Definition in file audio.cpp.

Function Documentation

AlsaNoopCallback()

static void AlsaNoopCallback ( __attribute__((unused)) const char *  file, __attribute__((unused)) int  line, __attribute__((unused)) const char *  function, __attribute__((unused)) int  err, __attribute__((unused)) const char *  fmt,   ...  )

static

Empty log callback.

Definition at line 1527 of file audio.cpp.

Referenced by cSoftHdAudio::AlsaInit().

ReorderAudioFrame()

static void ReorderAudioFrame ( uint16_t *  buf, int  size, int  channels  )

static

Reorder audio frame.

ffmpeg L R C Ls Rs -> alsa L R Ls Rs C ffmpeg L R C LFE Ls Rs -> alsa L R Ls Rs C LFE ffmpeg L R C LFE Ls Rs Rl Rr -> alsa L R Ls Rs C LFE Rl Rr

Parameters

buf[IN,OUT]	sample buffer
size	size of sample buffer in bytes
channels	number of channels interleaved in sample buffer

Definition at line 95 of file audio.cpp.

Referenced by cSoftHdAudio::EnqueueFrame().