usbloadergx/source/libwiigui/gui_sound_decoder_aiff.cpp

/****************************************************************************
 * libwiigui
 *
 * ardi 2009
 *
 * gui_sound_plugin_aif.cpp
 *
 * GUI class definitions
 ***************************************************************************/

#include <limits.h>
#include <asndlib.h>
#include <math.h>
#include <string.h>
#include <unistd.h>

#include "gui_sound_decoder.h"

// ------
// Copyright (C) 1988-1991 Apple Computer, Inc.
#ifndef HUGE_VAL
# define HUGE_VAL HUGE
#endif

# define UnsignedToFloat(u)         (((double)((long)(u - 2147483647L - 1))) + 2147483648.0)

static double ConvertFromIeeeExtended(const u8* bytes)
{
    double f;
    int expon;
    u32 hiMant, loMant;

    expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
    hiMant = ((unsigned long) (bytes[2] & 0xFF) << 24) | ((unsigned long) (bytes[3] & 0xFF) << 16)
            | ((unsigned long) (bytes[4] & 0xFF) << 8) | ((unsigned long) (bytes[5] & 0xFF));
    loMant = ((unsigned long) (bytes[6] & 0xFF) << 24) | ((unsigned long) (bytes[7] & 0xFF) << 16)
            | ((unsigned long) (bytes[8] & 0xFF) << 8) | ((unsigned long) (bytes[9] & 0xFF));

    if (expon == 0 && hiMant == 0 && loMant == 0)
        f = 0;
    else
    {
        if (expon == 0x7FFF)
            f = HUGE_VAL;
        else
        {
            expon -= 16383;
            f = ldexp(UnsignedToFloat( hiMant ), expon -= 31);
            f += ldexp(UnsignedToFloat( loMant ), expon -= 32);
        }
    }

    if (bytes[0] & 0x80)
        return -f;
    else return f;
}
// ------

class GuiSoundDecoderAIFF: public GuiSoundDecoder
{
    protected:
        GuiSoundDecoderAIFF(const u8 * snd, u32 len, bool snd_is_allocated)
        {
            sound = snd;
            length = len;
            is_allocated = snd_is_allocated;
            is_running = false;

            const u8 *in_ptr = sound;

            if (be32inc( in_ptr ) != 0x464F524D /*'FORM'*/) throw("No FORM chunk");
            if (be32inc( in_ptr ) + 8 != len) throw("wrong Size");
            if (be32inc( in_ptr ) != 0x41494646 /*'AIFF'*/) throw("No AIFF chunk");

            while (in_ptr + 8 < sound + len)
            {
                u32 chunk_id = be32inc( in_ptr );
                u32 chunk_size = be32inc( in_ptr );
                const u8 *chunk_start = in_ptr;
                switch (chunk_id)
                {
                    case 0x434F4D4D /*'COMM'*/:
                        channelCount = be16inc( in_ptr );
                        in_ptr += 4; // skip numSampleFrames
                        bytePerSample = (be16inc( in_ptr ) + 7) / 8;
                        if (bytePerSample < 1 && bytePerSample > 2) throw("wrong bits per Sample");
                        sampleRate = ConvertFromIeeeExtended(in_ptr);
                        break;
                    case 0x53534E44 /*'SSND'*/:
                        pcm_start = in_ptr + 8;
                        pcm_end = chunk_start + chunk_size;
                        break;
                }
                in_ptr = chunk_start + chunk_size;
            }
            currentPos = pcm_start;
        }
    public:
        ~GuiSoundDecoderAIFF()
        {
            while (is_running)
                usleep(50);
            if (is_allocated) delete[] sound;
        }
        static GuiSoundDecoder *Create(const u8 * snd, u32 len, bool snd_is_allocated)
        {
            if (snd && len > 12 && snd[0] == 'F' && snd[1] == 'O' && snd[2] == 'R' && snd[3] == 'M' && snd[8] == 'A'
                    && snd[9] == 'I' && snd[10] == 'F' && snd[11] == 'F') return new GuiSoundDecoderAIFF(snd, len,
                    snd_is_allocated);
            return NULL;
        }
        s32 GetFormat()
        {
            if (bytePerSample == 2)
                return channelCount == 2 ? VOICE_STEREO_16BIT : VOICE_MONO_16BIT;
            else return channelCount == 2 ? VOICE_STEREO_8BIT : VOICE_MONO_8BIT;
        }
        s32 GetSampleRate()
        {
            return sampleRate;
        }
        /*  Read reads data from stream to buffer
         return: >0 = readed bytes;
         0 = EOF;
         <0 = Error;
         */
        int Read(u8 * buffer, int buffer_size)
        {
            if (currentPos >= pcm_end) return 0; // EOF

            is_running = true;
            if (currentPos + buffer_size > pcm_end) buffer_size = pcm_end - currentPos;
            memcpy(buffer, currentPos, buffer_size);
            currentPos += buffer_size;
            is_running = false;
            return buffer_size;
        }
        int Rewind()
        {
            while (is_running)
                usleep(50);
            currentPos = pcm_start;
            return 0;
        }
    private:
        const u8 *sound;
        u32 length;
        bool is_allocated;
        bool is_running;

        u32 sampleRate;
        u16 channelCount;
        u16 bytePerSample;
        const u8 *pcm_start;
        const u8 *pcm_end;
        const u8 *currentPos;
};
REGISTER_GUI_SOUND_DECODER( GuiSoundDecoderAIFF );