/*****************************************************************************

 * uleaddvaudio.c

 *****************************************************************************

 * Copyright (C) 2012 Laurent Aimar

 *

 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>

 *

 * 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; either version 2.1 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 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.

 *****************************************************************************/

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <vlc_common.h>

#include <vlc_plugin.h>

#include <vlc_codec.h>

#include "../demux/rawdv.h"

/*****************************************************************************

 * Module descriptor

 *****************************************************************************/

static int  Open(vlc_object_t *);

vlc_module_begin()

    set_description(N_("Ulead DV audio decoder"))

    set_capability("audio decoder", 50)

    set_subcategory(SUBCAT_INPUT_ACODEC)

    set_callback(Open)

vlc_module_end()

typedef struct

{

    date_t end_date;

    bool     is_pal;

    bool     is_12bit;

    uint16_t shuffle[2000];

} decoder_sys_t;

static void Flush(decoder_t *dec)

{

    decoder_sys_t *sys = dec->p_sys;

    date_Set(&sys->end_date, VLC_TICK_INVALID);

}

static block_t *DecodeBlock(decoder_t *dec, block_t *block)

{

    decoder_sys_t *sys  = dec->p_sys;

    block_t *output = NULL;

    if (block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) {

        Flush(dec);

        if (block->i_flags & BLOCK_FLAG_CORRUPTED) {

            goto done;

        }

    }

    if (block->i_pts != VLC_TICK_INVALID &&

        block->i_pts != date_Get(&sys->end_date))

        date_Set(&sys->end_date, block->i_pts);

    block->i_pts = VLC_TICK_INVALID;

    if (date_Get(&sys->end_date) == VLC_TICK_INVALID) {

        /* We've just started the stream, wait for the first PTS. */

        goto done;

    }

    const unsigned int block_size = sys->is_pal ? 8640 : 7200;

    if (block->i_buffer >= block_size) {

        uint8_t *src = block->p_buffer;

        block->i_buffer -= block_size;

        block->p_buffer += block_size;

        int sample_count = dv_get_audio_sample_count(&src[244], sys->is_pal);

        if( decoder_UpdateAudioFormat(dec))

            goto done;

        output = decoder_NewAudioBuffer(dec, sample_count);

        if (!output)

            goto done;

        output->i_pts    = date_Get(&sys->end_date);

        output->i_length = date_Increment(&sys->end_date, sample_count) - output->i_pts;

        int16_t *dst = (int16_t*)output->p_buffer;

        for (int i = 0; i < sample_count; i++) {

          const uint8_t *v = &src[sys->shuffle[i]];

          if (sys->is_12bit) {

              *dst++ = dv_audio_12to16((v[0] << 4) | ((v[2] >> 4) & 0x0f));

              *dst++ = dv_audio_12to16((v[1] << 4) | ((v[2] >> 0) & 0x0f));

          } else {

              *dst++ = GetWBE(&v[0]);

              *dst++ = GetWBE(&v[sys->is_pal ? 4320 : 3600]);

          }

        }

    }

done:

    block_Release(block);

    return output;

}

static int DecodeAudio(decoder_t *dec, block_t *block)

{

    if (block == NULL) /* No Drain */

        return VLCDEC_SUCCESS;

    block_t *out;

    while ((out = DecodeBlock(dec, block)) != NULL)

        decoder_QueueAudio(dec,out);

    return VLCDEC_SUCCESS;

}

static int Open(vlc_object_t *object)

{

    decoder_t *dec = (decoder_t*)object;

    if (dec->fmt_in->i_codec != VLC_CODEC_ULEAD_DV_AUDIO_NTSC &&

        dec->fmt_in->i_codec != VLC_CODEC_ULEAD_DV_AUDIO_PAL)

        return VLC_EGENERIC;

    if (dec->fmt_in->audio.i_bitspersample != 12 && dec->fmt_in->audio.i_bitspersample != 16)

        return VLC_EGENERIC;

    if (dec->fmt_in->audio.i_channels != 2)

        return VLC_EGENERIC;

    if (dec->fmt_in->audio.i_rate <= 0)

        return VLC_EGENERIC;

    decoder_sys_t *sys = dec->p_sys = vlc_obj_malloc(object, sizeof(*sys));

    if (!sys)

        return VLC_ENOMEM;

    sys->is_pal = dec->fmt_in->i_codec == VLC_CODEC_ULEAD_DV_AUDIO_PAL;

    sys->is_12bit = dec->fmt_in->audio.i_bitspersample == 12;

    date_Init(&sys->end_date, dec->fmt_in->audio.i_rate, 1);

    for (unsigned i = 0; i < ARRAY_SIZE(sys->shuffle); i++) {

        const unsigned a = sys->is_pal ? 18 : 15;

        const unsigned b = 3 * a;

        sys->shuffle[i] = 80 * ((21 * (i % 3) + 9 * (i / 3) + ((i / a) % 3)) % b) +

                          (2 + sys->is_12bit) * (i / b) + 8;

    }

    dec->fmt_out.i_codec = VLC_CODEC_S16N;

    dec->fmt_out.audio.i_rate = dec->fmt_in->audio.i_rate;

    dec->fmt_out.audio.i_channels = 2;

    dec->fmt_out.audio.i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;

    dec->pf_decode = DecodeAudio;

    dec->pf_flush  = Flush;

    return VLC_SUCCESS;

}