audio.cpp File Reference

Audio and Alsa Interface. More...

#include <chrono>
#include <cmath>
#include <cstdint>
#include <mutex>
#include <string>
#include <sstream>
#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 <vdr/thread.h>
#include "audio.h"
#include "codec_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"

Go to the source code of this file.

Functions
static const char *	alsaToFFmpegChannel (const char *alsaName)
	FFmpeg does not have channels called "RL" or "RR" So "rename" Alsas RL (rear left) and RR (rear right) to FFmpegs BL (back left) and BR (back right) to make the channelmap filter parser happy.
static std::vector< std::string >	GetAlsaChannelLayoutAsArray (snd_pcm_t *pcmHandle)
	Put Alsa channel layout in a dynamic array of strings.
static std::vector< std::string >	GetFFmpegChannelLayoutAsArray (const AVChannelLayout &layout)
	Put FFmpeg channel layout in a dynamic array of strings.
static bool	LayoutsMatch (const std::vector< std::string > &ff, const std::vector< std::string > &alsa)
	Check, if FFmpeg and Alsa channel layout match.
static std::string	BuildChannelMapFilter (snd_pcm_t *pcmHandle, const AVChannelLayout &layout)
	Build the "|"-separated mappings list for the channelmap filter.
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 Interface.

cSoftHdAudio handles everything audio related except the decoding itself (see cAudioDecoder).

Copyright

2009 - 2014 by Johns. All Rights Reserved.

2018 by zille. All Rights Reserved.

2025 - 2026 by Andreas Baierl. All Rights Reserved.

License

AGPL-3.0-or-later

Definition in file audio.cpp.