/*

* OpenAL Bridge - a simple portable library for OpenAL interface

* Copyright (c) 2009 Vittorio Giovara <vittorio.giovara@gmail.com>

*

* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation; version 2 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 Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

*/

#include "loaders.h"

#include "wrappers.h"

#include "vorbis/vorbisfile.h"

#include "openalbridge_t.h"

    WAV_header_t WAVHeader;

    FILE *wavfile;

    int32_t t;

    uint32_t n = 0;

    uint8_t sub0, sub1, sub2, sub3;

    wavfile = Fopen(filename, "rb");

    fread(&WAVHeader.ChunkID, sizeof(uint32_t), 1, wavfile);                /*RIFF*/

    fread(&WAVHeader.ChunkSize, sizeof(uint32_t), 1, wavfile);

    fread(&WAVHeader.Format, sizeof(uint32_t), 1, wavfile);                 /*WAVE*/

#ifdef DEBUG

    fprintf(stderr, "ChunkID: %X\n", ENDIAN_BIG_32(WAVHeader.ChunkID));

    fprintf(stderr, "ChunkSize: %d\n", ENDIAN_LITTLE_32(WAVHeader.ChunkSize));

    fprintf(stderr, "Format: %X\n", ENDIAN_BIG_32(WAVHeader.Format));

#endif

    fread(&WAVHeader.Subchunk1ID, sizeof(uint32_t), 1, wavfile);            /*fmt */

    fread(&WAVHeader.Subchunk1Size, sizeof(uint32_t), 1, wavfile);

    fread(&WAVHeader.AudioFormat, sizeof(uint16_t), 1, wavfile);

    fread(&WAVHeader.NumChannels, sizeof(uint16_t), 1, wavfile);

    fread(&WAVHeader.SampleRate, sizeof(uint32_t), 1, wavfile);

    fread(&WAVHeader.ByteRate, sizeof(uint32_t), 1, wavfile);

    fread(&WAVHeader.BlockAlign, sizeof(uint16_t), 1, wavfile);

    fread(&WAVHeader.BitsPerSample, sizeof(uint16_t), 1, wavfile);

#ifdef DEBUG

    fprintf(stderr, "Subchunk1ID: %X\n", ENDIAN_BIG_32(WAVHeader.Subchunk1ID));

    fprintf(stderr, "Subchunk1Size: %d\n", ENDIAN_LITTLE_32(WAVHeader.Subchunk1Size));

    fprintf(stderr, "AudioFormat: %d\n", ENDIAN_LITTLE_16(WAVHeader.AudioFormat));

    fprintf(stderr, "NumChannels: %d\n", ENDIAN_LITTLE_16(WAVHeader.NumChannels));

    fprintf(stderr, "SampleRate: %d\n", ENDIAN_LITTLE_32(WAVHeader.SampleRate));

    fprintf(stderr, "ByteRate: %d\n", ENDIAN_LITTLE_32(WAVHeader.ByteRate));

    fprintf(stderr, "BlockAlign: %d\n", ENDIAN_LITTLE_16(WAVHeader.BlockAlign));

    fprintf(stderr, "BitsPerSample: %d\n", ENDIAN_LITTLE_16(WAVHeader.BitsPerSample));

#endif

    /*remove useless header chunks by looking for the WAV_HEADER_SUBCHUNK2ID integer */

    do {

        t = fread(&sub0, sizeof(uint8_t), 1, wavfile);

        if(sub0 == 0x64) {

            t = fread(&sub1, sizeof(uint8_t), 1, wavfile);

            if(sub1 == 0x61) {

                t = fread(&sub2, sizeof(uint8_t), 1, wavfile);

                if(sub2 == 0x74) {

                    t = fread(&sub3, sizeof(uint8_t), 1, wavfile);

                    if(sub3 == 0x61) {

                        WAVHeader.Subchunk2ID = WAV_HEADER_SUBCHUNK2ID;

                        break;

                    }

                }

            }

        }

        if (t <= 0) {

            // eof

            return -1;

        }

    } while (1);

    fread(&WAVHeader.Subchunk2Size, sizeof(uint32_t), 1, wavfile);

#ifdef DEBUG

    fprintf(stderr, "Subchunk2ID: %X\n", ENDIAN_LITTLE_32(WAVHeader.Subchunk2ID));

    fprintf(stderr, "Subchunk2Size: %d\n", ENDIAN_LITTLE_32(WAVHeader.Subchunk2Size));

#endif

    *data = (char*) Malloc (sizeof(char) * ENDIAN_LITTLE_32(WAVHeader.Subchunk2Size));

    /*read the actual sound data*/

    do {

        n += fread(&((*data)[n]), sizeof(uint8_t), 4, wavfile);

    } while (n < ENDIAN_LITTLE_32(WAVHeader.Subchunk2Size));

    fclose(wavfile);

#ifdef DEBUG

#endif

    /*set parameters for OpenAL*/

    /*Valid formats are AL_FORMAT_MONO8, AL_FORMAT_MONO16, AL_FORMAT_STEREO8, and AL_FORMAT_STEREO16*/

    if (ENDIAN_LITTLE_16(WAVHeader.NumChannels) == 1) {

        if (ENDIAN_LITTLE_16(WAVHeader.BitsPerSample) == 8)

            *format = AL_FORMAT_MONO8;

        else {

            if (ENDIAN_LITTLE_16(WAVHeader.BitsPerSample) == 16)

                *format = AL_FORMAT_MONO16;

            else {

                return -2;

            }

        }

    } else {

        if (ENDIAN_LITTLE_16(WAVHeader.NumChannels) == 2) {

            if (ENDIAN_LITTLE_16(WAVHeader.BitsPerSample) == 8)

                *format = AL_FORMAT_STEREO8;

            else {

                if (ENDIAN_LITTLE_16(WAVHeader.BitsPerSample) == 16)

                    *format = AL_FORMAT_STEREO16;

                else {

                    return -2;

                }

            }

        } else {

            return -2;

        }

    }

    *bitsize = ENDIAN_LITTLE_32(WAVHeader.Subchunk2Size);

    *freq    = ENDIAN_LITTLE_32(WAVHeader.SampleRate);

    return 0;

}

int load_oggvorbis (const char *filename, ALenum *format, char **data, ALsizei *bitsize, ALsizei *freq) {

    /*implementation inspired from http://www.devmaster.net/forums/showthread.php?t=1153 */

    /*ogg handle*/

    FILE *oggFile;

    /*stream handle*/

    OggVorbis_File oggStream;

    /*some formatting data*/

    vorbis_info *vorbisInfo;

    /*length of the decoded data*/

    int64_t pcm_length;

    /*other vars*/

    int section, result, size, endianness;

#ifdef DEBUG

    int i;

    /*other less useful data*/

    vorbis_comment *vorbisComment;

#endif

    oggFile = Fopen(filename, "rb");

    result = ov_open_callbacks(oggFile, &oggStream, NULL, 0, OV_CALLBACKS_DEFAULT);

    if (result < 0) {

        ov_clear(&oggStream);

        return -1;

    }

    /*load OGG header and determine the decoded data size*/

    vorbisInfo = ov_info(&oggStream, -1);

    pcm_length = ov_pcm_total(&oggStream, -1) << vorbisInfo->channels;

#ifdef DEBUG

    vorbisComment = ov_comment(&oggStream, -1);

    fprintf(stderr, "Version: %d\n", vorbisInfo->version);

    fprintf(stderr, "Channels: %d\n", vorbisInfo->channels);

    fprintf(stderr, "Rate (Hz): %ld\n", vorbisInfo->rate);

    fprintf(stderr, "Bitrate Upper: %ld\n", vorbisInfo->bitrate_upper);

    fprintf(stderr, "Bitrate Nominal: %ld\n", vorbisInfo->bitrate_nominal);

    fprintf(stderr, "Bitrate Lower: %ld\n", vorbisInfo->bitrate_lower);

    fprintf(stderr, "Bitrate Windows: %ld\n", vorbisInfo->bitrate_window);

    fprintf(stderr, "Vendor: %s\n", vorbisComment->vendor);

    fprintf(stderr, "PCM data size: %lld\n", pcm_length);

    fprintf(stderr, "# comment: %d\n", vorbisComment->comments);

    for (i = 0; i < vorbisComment->comments; i++)

        fprintf(stderr, "\tComment %d: %s\n", i, vorbisComment->user_comments[i]);

#endif

    /*allocates enough room for the decoded data*/

    *data = (char*) Malloc (sizeof(char) * pcm_length);

    /*there *should* not be ogg at 8 bits*/

    if (vorbisInfo->channels == 1)

        *format = AL_FORMAT_MONO16;

    else {

        if (vorbisInfo->channels == 2)

            *format = AL_FORMAT_STEREO16;

        else {

            ov_clear(&oggStream);

            return -2;

        }

    }

    size = 0;

#ifdef __LITTLE_ENDIAN__

    endianness = 0;

#elif __BIG_ENDIAN__

    endianness = 1;

#endif

    while (size < pcm_length) {

        /*ov_read decodes the ogg stream and storse the pcm in data*/

        result = ov_read (&oggStream, *data + size, pcm_length - size, endianness, 2, 1, &section);

        if (result > 0) {

            size += result;

        } else {

            if (result == 0)

                break;

            else {

                ov_clear(&oggStream);

                return -3;

            }

        }

    }

    /*set the last fields*/

    *bitsize = size;

    *freq = vorbisInfo->rate;

    /*cleaning time (ov_clear also closes file handler)*/

    ov_clear(&oggStream);

    return 0;

}