/*
    DeaDBeeF - ultimate music player for GNU/Linux systems with X11
    Copyright (C) 2009-2011 Alexey Yakovenko <waker@users.sourceforge.net>

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.
    
    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 General Public License for more details.
    
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
#ifndef __linux__
#define _LARGEFILE64_SOURCE
#endif
#include <string.h>
#include <sndfile.h>
#include "../../deadbeef.h"

#define min(x,y) ((x)<(y)?(x):(y))
#define max(x,y) ((x)>(y)?(x):(y))

//#define trace(...) { fprintf(stderr, __VA_ARGS__); }
#define trace(fmt,...)

static DB_decoder_t plugin;
static DB_functions_t *deadbeef;

typedef struct {
    DB_fileinfo_t info;
    SNDFILE *ctx;
    DB_FILE *file;
    int startsample;
    int endsample;
    int currentsample;
    int bitrate;
} sndfile_info_t;

// vfs wrapper for sf
static sf_count_t
sf_vfs_get_filelen (void *user_data) {
    sndfile_info_t *ctx = user_data;
    return deadbeef->fgetlength (ctx->file);
}

static sf_count_t
sf_vfs_read (void *ptr, sf_count_t count, void *user_data) {
    sndfile_info_t *ctx = user_data;
    return deadbeef->fread (ptr, 1, count, ctx->file);
}

static sf_count_t
sf_vfs_write (const void *ptr, sf_count_t count, void *user_data) {
    return -1;
}

static sf_count_t
sf_vfs_seek (sf_count_t offset, int whence, void *user_data) {
    sndfile_info_t *ctx = user_data;
    int ret = deadbeef->fseek (ctx->file, offset, whence);
    if (!ret) {
        return offset;
    }
    return -1;
}

static sf_count_t
sf_vfs_tell (void *user_data) {
    sndfile_info_t *ctx = user_data;
    return deadbeef->ftell (ctx->file);
}

static SF_VIRTUAL_IO vfs = {
    .get_filelen = sf_vfs_get_filelen,
    .seek = sf_vfs_seek,
    .read = sf_vfs_read,
    .write = sf_vfs_write,
    .tell = sf_vfs_tell
};

static DB_fileinfo_t *
sndfile_open (uint32_t hints) {
    DB_fileinfo_t *_info = malloc (sizeof (sndfile_info_t));
    memset (_info, 0, sizeof (sndfile_info_t));
    return _info;
}


// taken from libsndfile
#define     ARRAY_LEN(x)    ((int) (sizeof (x) / sizeof ((x) [0])))
/* This stores which bit in dwChannelMask maps to which channel */
static const struct chanmap_s
{	int id ;
	const char * name ;
} channel_mask_bits [] =
{	/* WAVEFORMATEXTENSIBLE doesn't distuingish FRONT_LEFT from LEFT */
	{	SF_CHANNEL_MAP_LEFT, "L" },
	{	SF_CHANNEL_MAP_RIGHT, "R" },
	{	SF_CHANNEL_MAP_CENTER, "C" },
	{	SF_CHANNEL_MAP_LFE, "LFE" },
	{	SF_CHANNEL_MAP_REAR_LEFT, "Ls" },
	{	SF_CHANNEL_MAP_REAR_RIGHT, "Rs" },
	{	SF_CHANNEL_MAP_FRONT_LEFT_OF_CENTER, "Lc" },
	{	SF_CHANNEL_MAP_FRONT_RIGHT_OF_CENTER, "Rc" },
	{	SF_CHANNEL_MAP_REAR_CENTER, "Cs" },
	{	SF_CHANNEL_MAP_SIDE_LEFT, "Sl" },
	{	SF_CHANNEL_MAP_SIDE_RIGHT, "Sr" },
	{	SF_CHANNEL_MAP_TOP_CENTER, "Tc" },
	{	SF_CHANNEL_MAP_TOP_FRONT_LEFT, "Tfl" },
	{	SF_CHANNEL_MAP_TOP_FRONT_CENTER, "Tfc" },
	{	SF_CHANNEL_MAP_TOP_FRONT_RIGHT, "Tfr" },
	{	SF_CHANNEL_MAP_TOP_REAR_LEFT, "Trl" },
	{	SF_CHANNEL_MAP_TOP_REAR_CENTER, "Trc" },
	{	SF_CHANNEL_MAP_TOP_REAR_RIGHT, "Trr" },
} ;


static int
wavex_gen_channel_mask (const int *chan_map, int channels)
{   int chan, mask = 0, bit = -1, last_bit = -1 ;

    if (chan_map == NULL)
        return 0 ;

    for (chan = 0 ; chan < channels ; chan ++)
    {   int k ;

        for (k = bit + 1 ; k < ARRAY_LEN (channel_mask_bits) ; k++)
            if (chan_map [chan] == channel_mask_bits [k].id)
            {   bit = k ;
                break ;
                } ;

        /* Check for bad sequence. */
        if (bit <= last_bit)
            return 0 ;

        mask += 1 << bit ;
        last_bit = bit ;
        } ;

    return mask ;
} /* wavex_gen_channel_mask */


static int
sndfile_init (DB_fileinfo_t *_info, DB_playItem_t *it) {
    sndfile_info_t *info = (sndfile_info_t*)_info;

    SF_INFO inf;
    DB_FILE *fp = deadbeef->fopen (it->fname);
    if (!fp) {
        trace ("sndfile: failed to open %s\n", it->fname);
        return -1;
    }
    int fsize = deadbeef->fgetlength (fp);

    info->file = fp;
    info->ctx = sf_open_virtual (&vfs, SFM_READ, &inf, info);
    if (!info->ctx) {
        trace ("sndfile: %s: unsupported file format\n");
        return -1;
    }
    _info->plugin = &plugin;

    switch (inf.format&0x000f) {
    case SF_FORMAT_PCM_S8:
    case SF_FORMAT_PCM_U8:
        _info->fmt.bps = 8;
        break;
    case SF_FORMAT_PCM_16:
        _info->fmt.bps = 16;
        break;
    case SF_FORMAT_PCM_24:
        _info->fmt.bps = 24;
        break;
    case SF_FORMAT_PCM_32:
    case SF_FORMAT_FLOAT:
        _info->fmt.bps = 32;
        break;
    case SF_FORMAT_DOUBLE:
        fprintf (stderr, "[sndfile] 64 bit float input format is not supported (yet)\n");
        return -1;
//        _info->fmt.bps = 64;
        break;
    default:
        fprintf (stderr, "[sndfile] unidentified input format: 0x%X\n", inf.format&0x000f);
        return -1;
    }

    _info->fmt.channels = inf.channels;
    _info->fmt.samplerate = inf.samplerate;

    int channel_map [inf.channels];
    int cmdres = sf_command (info->ctx, SFC_GET_CHANNEL_MAP_INFO, channel_map, sizeof (channel_map)) ;
    if (cmdres != SF_FALSE) {
        // channel map found, convert to channel mask
        _info->fmt.channelmask = wavex_gen_channel_mask (channel_map, inf.channels);
    }
    else {
        // channel map not found, generate from channel number
        for (int i = 0; i < inf.channels; i++) {
            _info->fmt.channelmask |= 1 << i;
        }
    }

    _info->readpos = 0;
    if (it->endsample > 0) {
        info->startsample = it->startsample;
        info->endsample = it->endsample;
        if (plugin.seek_sample (_info, 0) < 0) {
            return -1;
        }
    }
    else {
        info->startsample = 0;
        info->endsample = inf.frames-1;
    }
    // hack bitrate
    float sec = (float)(info->endsample-info->startsample) / inf.samplerate;
    if (sec > 0) {
        info->bitrate = fsize / sec * 8 / 1000;
    }
    else {
        info->bitrate = -1;
    }

    return 0;
}

static void
sndfile_free (DB_fileinfo_t *_info) {
    sndfile_info_t *info = (sndfile_info_t*)_info;
    if (info->ctx) {
        sf_close (info->ctx);
    }
    if (info->file) {
        deadbeef->fclose (info->file);
    }
    memset (&info, 0, sizeof (info));
}

static int
sndfile_read (DB_fileinfo_t *_info, char *bytes, int size) {
    sndfile_info_t *info = (sndfile_info_t*)_info;
    int samplesize = _info->fmt.channels * _info->fmt.bps / 8;
    if (size / samplesize + info->currentsample > info->endsample) {
        size = (info->endsample - info->currentsample + 1) * samplesize;
        trace ("sndfile: size truncated to %d bytes, cursample=%d, endsample=%d\n", size, info->currentsample, info->endsample);
        if (size <= 0) {
            return 0;
        }
    }

    int n = 0;
    n = sf_read_raw (info->ctx, (short *)bytes, size);
    n /= samplesize;
    info->currentsample += n;

    size = n * samplesize;
    _info->readpos = (float)(info->currentsample-info->startsample)/_info->fmt.samplerate;
    if (info->bitrate > 0) {
        deadbeef->streamer_set_bitrate (info->bitrate);
    }
    return size;
}

static int
sndfile_seek_sample (DB_fileinfo_t *_info, int sample) {
    sndfile_info_t *info = (sndfile_info_t*)_info;
    int ret = sf_seek (info->ctx, sample + info->startsample, SEEK_SET);
    if (ret < 0) {
        return -1;
    }
    info->currentsample = ret;
    _info->readpos = (float)(info->currentsample - info->startsample) / _info->fmt.samplerate;
    return 0;
}

static int
sndfile_seek (DB_fileinfo_t *_info, float sec) {
    return sndfile_seek_sample (_info, sec * _info->fmt.samplerate);
}

static DB_playItem_t *
sndfile_insert (DB_playItem_t *after, const char *fname) {
    SF_INFO inf;
    sndfile_info_t info;
    memset (&info, 0, sizeof (info));
    info.file = deadbeef->fopen (fname);
    if (!info.file) {
        trace ("sndfile: failed to open %s\n", fname);
        return NULL;
    }
    info.ctx = sf_open_virtual (&vfs, SFM_READ, &inf, &info);
    if (!info.ctx) {
        trace ("sndfile: sf_open failed");
        deadbeef->fclose (info.file);
        return NULL;
    }
    int totalsamples = inf.frames;
    int samplerate = inf.samplerate;
    sf_close (info.ctx);
    deadbeef->fclose (info.file);

    float duration = (float)totalsamples / samplerate;
    DB_playItem_t *it = deadbeef->pl_item_alloc ();
    it->decoder_id = deadbeef->plug_get_decoder_id (plugin.plugin.id);
    it->fname = strdup (fname);
    it->filetype = "wav";
    deadbeef->pl_set_item_duration (it, duration);

    trace ("sndfile: totalsamples=%d, samplerate=%d, duration=%f\n", totalsamples, samplerate, duration);

    DB_playItem_t *cue_after = deadbeef->pl_insert_cue (after, it, totalsamples, samplerate);
    if (cue_after) {
        deadbeef->pl_item_unref (it);
        deadbeef->pl_item_unref (cue_after);
        return cue_after;
    }

    deadbeef->pl_add_meta (it, "title", NULL);
    after = deadbeef->pl_insert_item (after, it);
    deadbeef->pl_item_unref (it);

    return after;
}

static const char * exts[] = { "wav", "aif", "aiff", "snd", "au", "paf", "svx", "nist", "voc", "ircam", "w64", "mat4", "mat5", "pvf", "xi", "htk", "sds", "avr", "wavex", "sd2", "caf", "wve", NULL };
static const char *filetypes[] = { "WAV", NULL };

// define plugin interface
static DB_decoder_t plugin = {
    DB_PLUGIN_SET_API_VERSION
    .plugin.version_major = 1,
    .plugin.version_minor = 0,
    .plugin.type = DB_PLUGIN_DECODER,
    .plugin.id = "sndfile",
    .plugin.name = "pcm player",
    .plugin.descr = "wav/aiff player using libsndfile",
    .plugin.author = "Alexey Yakovenko",
    .plugin.email = "waker@users.sourceforge.net",
    .plugin.website = "http://deadbeef.sf.net",
    .open = sndfile_open,
    .init = sndfile_init,
    .free = sndfile_free,
    .read = sndfile_read,
    .seek = sndfile_seek,
    .seek_sample = sndfile_seek_sample,
    .insert = sndfile_insert,
    .exts = exts,
    .filetypes = filetypes
};

DB_plugin_t *
sndfile_load (DB_functions_t *api) {
    deadbeef = api;
    return DB_PLUGIN (&plugin);
}