Record-ALSA.cpp File Reference

#include "config.h"
#include <errno.h>
#include <math.h>
#include <QtGlobal>
#include "libkwave/Compression.h"
#include "libkwave/String.h"
#include "libkwave/Utils.h"
#include "Record-ALSA.h"

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Macros
#define	DEFAULT_DEVICE   (i18n("DSNOOP plugin") + _("|sound_note"))
#define	ELEMENTS_OF(__array__)   (sizeof(__array__) / sizeof(__array__[0]))
#define	SND_PCM_FORMAT_S18_3   SND_PCM_FORMAT_S18_3BE
#define	SND_PCM_FORMAT_U18_3   SND_PCM_FORMAT_U18_3BE
#define	SND_PCM_FORMAT_U20_3   SND_PCM_FORMAT_U20_3BE
#define	SND_PCM_FORMAT_S20_3   SND_PCM_FORMAT_S20_3BE
#define	SND_PCM_FORMAT_U24_3   SND_PCM_FORMAT_U24_3BE
#define	SND_PCM_FORMAT_S24_3   SND_PCM_FORMAT_S24_3BE

Functions
static Kwave::SampleFormat::Format	sample_format_of (snd_pcm_format_t fmt)
static Kwave::byte_order_t	endian_of (snd_pcm_format_t fmt)
static Kwave::Compression::Type	compression_of (snd_pcm_format_t fmt)

Variables
static const snd_pcm_format_t	_known_formats []

Macro Definition Documentation

DEFAULT_DEVICE

#define DEFAULT_DEVICE   (i18n("DSNOOP plugin") + _("|sound_note"))

gui name of the default device

Definition at line 36 of file Record-ALSA.cpp.

Referenced by Kwave::RecordALSA::scanDevices(), and Kwave::RecordALSA::supportedDevices().

ELEMENTS_OF

#define ELEMENTS_OF

(

__array__

)

(sizeof(__array__) / sizeof(__array__[0]))

helper macro: returns the number of elements in an array

Definition at line 39 of file Record-ALSA.cpp.

Referenced by Kwave::RecordALSA::detectSampleRates().

SND_PCM_FORMAT_S18_3

#define SND_PCM_FORMAT_S18_3   SND_PCM_FORMAT_S18_3BE

Definition at line 46 of file Record-ALSA.cpp.

SND_PCM_FORMAT_S20_3

#define SND_PCM_FORMAT_S20_3   SND_PCM_FORMAT_S20_3BE

Definition at line 49 of file Record-ALSA.cpp.

SND_PCM_FORMAT_S24_3

#define SND_PCM_FORMAT_S24_3   SND_PCM_FORMAT_S24_3BE

Definition at line 51 of file Record-ALSA.cpp.

SND_PCM_FORMAT_U18_3

#define SND_PCM_FORMAT_U18_3   SND_PCM_FORMAT_U18_3BE

Definition at line 47 of file Record-ALSA.cpp.

SND_PCM_FORMAT_U20_3

#define SND_PCM_FORMAT_U20_3   SND_PCM_FORMAT_U20_3BE

Definition at line 48 of file Record-ALSA.cpp.

SND_PCM_FORMAT_U24_3

#define SND_PCM_FORMAT_U24_3   SND_PCM_FORMAT_U24_3BE

Definition at line 50 of file Record-ALSA.cpp.

Function Documentation

compression_of()

static Kwave::Compression::Type compression_of ( snd_pcm_format_t  fmt )

static

Definition at line 177 of file Record-ALSA.cpp.

References Kwave::Compression::G711_ALAW, Kwave::Compression::G711_ULAW, Kwave::Compression::GSM, Kwave::Compression::MPEG_LAYER_I, Kwave::Compression::MS_ADPCM, and Kwave::Compression::NONE.

Referenced by Kwave::RecordALSA::detectCompressions(), Kwave::RecordALSA::detectSampleFormats(), Kwave::RecordALSA::mode2format(), and Kwave::RecordALSA::supportedBits().

{
    Kwave::Compression::Type c = Kwave::Compression::NONE;
    switch (fmt) {
        case SND_PCM_FORMAT_MU_LAW:
            c = Kwave::Compression::G711_ULAW;    break;
        case SND_PCM_FORMAT_A_LAW:
            c = Kwave::Compression::G711_ALAW;    break;
        case SND_PCM_FORMAT_IMA_ADPCM:
            c = Kwave::Compression::MS_ADPCM;     break;
        case SND_PCM_FORMAT_MPEG:
            c = Kwave::Compression::MPEG_LAYER_I; break;
        case SND_PCM_FORMAT_GSM:
            c = Kwave::Compression::GSM;          break;
        default:
            break;
    }
    return c;
}

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endian_of()

static Kwave::byte_order_t endian_of ( snd_pcm_format_t  fmt )

static

find out the endianness of an ALSA format

Definition at line 167 of file Record-ALSA.cpp.

References Kwave::BigEndian, Kwave::CpuEndian, and Kwave::LittleEndian.

Referenced by Kwave::RecordALSA::endianness().

{
    if (snd_pcm_format_little_endian(fmt) == 1)
        return Kwave::LittleEndian;
    if (snd_pcm_format_big_endian(fmt) == 1)
        return Kwave::BigEndian;
    return Kwave::CpuEndian;
}

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sample_format_of()

static Kwave::SampleFormat::Format sample_format_of ( snd_pcm_format_t  fmt )

static

find out the SampleFormat of an ALSA format

Definition at line 148 of file Record-ALSA.cpp.

References Kwave::SampleFormat::Double, Kwave::SampleFormat::Float, Kwave::SampleFormat::Signed, Kwave::SampleFormat::Unknown, and Kwave::SampleFormat::Unsigned.

Referenced by Kwave::RecordALSA::detectSampleFormats(), and Kwave::RecordALSA::mode2format().

{
    if (snd_pcm_format_float(fmt)) {
        if (snd_pcm_format_width(fmt) == 32)
            return Kwave::SampleFormat::Float;
        if (snd_pcm_format_width(fmt) == 64)
            return Kwave::SampleFormat::Double;
    } else if (snd_pcm_format_linear(fmt)) {
        if (snd_pcm_format_signed(fmt) == 1)
            return Kwave::SampleFormat::Signed;
        else if (snd_pcm_format_unsigned(fmt) == 1)
            return Kwave::SampleFormat::Unsigned;
    }

    return Kwave::SampleFormat::Unknown;
}

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Variable Documentation

_known_formats

const snd_pcm_format_t _known_formats[]

static

Global list of all known sample formats.

Note

this list should be sorted so that the most preferable formats come first in the list. When searching for a format that matches a given set of parameters, the first entry is taken.

The sort order should be:

• compression: none -> ulaw -> alaw -> adpcm -> mpeg ...
• bits per sample: ascending
• sample format: signed -> unsigned -> float -> double ...
• endianness: cpu -> little -> big
• bytes per sample: ascending

Definition at line 77 of file Record-ALSA.cpp.

Referenced by Kwave::RecordALSA::detectCompressions(), Kwave::RecordALSA::detectSampleFormats(), Kwave::RecordALSA::detectSupportedFormats(), Kwave::RecordALSA::endianness(), Kwave::RecordALSA::initialize(), Kwave::RecordALSA::mode2format(), and Kwave::RecordALSA::supportedBits().