MP3Decoder.cpp File Reference

#include "config.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <id3/globals.h>
#include <id3/misc_support.h>
#include <id3/tag.h>
#include <QDate>
#include <QDateTime>
#include <QLatin1Char>
#include <QTime>
#include "libkwave/Compression.h"
#include "libkwave/GenreType.h"
#include "libkwave/MessageBox.h"
#include "libkwave/MultiWriter.h"
#include "libkwave/Sample.h"
#include "libkwave/SampleArray.h"
#include "libkwave/String.h"
#include "libkwave/Utils.h"
#include "libkwave/Writer.h"
#include "ID3_QIODeviceReader.h"
#include "MP3CodecPlugin.h"
#include "MP3Decoder.h"

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Classes
struct	Kwave::audio_dither

Namespaces
	Kwave

Functions
static enum mad_flow	_input_adapter (void *data, struct mad_stream *stream)
static enum mad_flow	_output_adapter (void *data, struct mad_header const *header, struct mad_pcm *pcm)
static enum mad_flow	_error_adapter (void *data, struct mad_stream *stream, struct mad_frame *frame)
static quint32	prng (quint32 state)
static qint32	audio_linear_dither (unsigned int bits, mad_fixed_t sample, Kwave::audio_dither *dither)

Function Documentation

_error_adapter()

static enum mad_flow _error_adapter ( void *  data, struct mad_stream *  stream, struct mad_frame *  frame  )

static

Definition at line 493 of file MP3Decoder.cpp.

References Kwave::MP3Decoder::handleError().

Referenced by Kwave::MP3Decoder::decode().

{
    Kwave::MP3Decoder *decoder = reinterpret_cast<Kwave::MP3Decoder *>(data);
    Q_ASSERT(decoder);
    return (decoder) ?
        decoder->handleError(data, stream, frame) : MAD_FLOW_BREAK;
}

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_input_adapter()

static enum mad_flow _input_adapter ( void *  data, struct mad_stream *  stream  )

static

Definition at line 474 of file MP3Decoder.cpp.

References Kwave::MP3Decoder::fillInput().

Referenced by Kwave::MP3Decoder::decode().

{
    Kwave::MP3Decoder *decoder = reinterpret_cast<Kwave::MP3Decoder *>(data);
    Q_ASSERT(decoder);
    return (decoder) ? decoder->fillInput(stream) : MAD_FLOW_STOP;
}

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_output_adapter()

static enum mad_flow _output_adapter ( void *  data, struct mad_header const *  header, struct mad_pcm *  pcm  )

static

Definition at line 482 of file MP3Decoder.cpp.

References Kwave::MP3Decoder::processOutput().

Referenced by Kwave::MP3Decoder::decode().

{
    Kwave::MP3Decoder *decoder = reinterpret_cast<Kwave::MP3Decoder *>(data);
    Q_ASSERT(decoder);
    return (decoder) ?
        decoder->processOutput(data, header, pcm) : MAD_FLOW_STOP;
}

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audio_linear_dither()

static qint32 audio_linear_dither ( unsigned int  bits, mad_fixed_t  sample, Kwave::audio_dither *  dither  )

inlinestatic

generic linear sample quantize and dither routine (copied from mpg231, mad.c)

Author

Rob Leslie

Definition at line 626 of file MP3Decoder.cpp.

References Kwave::audio_dither::error, prng(), and Kwave::audio_dither::random.

Referenced by Kwave::MP3Decoder::processOutput().

{
    unsigned int scalebits;
    mad_fixed_t output, mask, random;

    enum {
        MIN = -MAD_F_ONE,
        MAX =  MAD_F_ONE - 1
    };

    /* noise shape */
    sample += dither->error[0] - dither->error[1] + dither->error[2];

    dither->error[2] = dither->error[1];
    dither->error[1] = dither->error[0] / 2;

    /* bias */
    output = sample + mad_fixed_t(1L << (MAD_F_FRACBITS + 1 - bits - 1));

    scalebits = MAD_F_FRACBITS + 1 - bits;
    mask = mad_fixed_t(1L << scalebits) - 1;

    /* dither */
    random  = static_cast<mad_fixed_t>(prng(dither->random));
    output += (random & mask) - (dither->random & mask);

    dither->random = random;

    /* clip */
    if (output > MAX) {
        output = MAX;
        if (sample > MAX) sample = MAX;
    } else if (output < MIN) {
        output = MIN;
        if (sample < MIN) sample = MIN;
    }

    /* quantize */
    output &= ~mask;

    /* error feedback */
    dither->error[0] = sample - output;

    /* scale */
    return output >> scalebits;
}

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prng()

static quint32 prng ( quint32  state )

inlinestatic

32-bit pseudo-random number generator (copied from mpg231, mad.c)

Author

Rob Leslie

Definition at line 616 of file MP3Decoder.cpp.

Referenced by audio_linear_dither().

{
    return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
}

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