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

 * rawaud.c : raw audio input module for vlc

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

 * Copyright (C) 2009 VLC authors and VideoLAN

 *

 * Authors: Jarmo Torvinen <jarmo.torvinen@jutel.fi>

 *

 * 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.

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

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

 * Preamble

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

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <vlc_common.h>

#include <vlc_plugin.h>

#include <vlc_demux.h>

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

 * Module descriptor

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

static int  Open ( vlc_object_t * );

static void Close( vlc_object_t * );

#define SAMPLERATE_TEXT N_("Audio samplerate (Hz)")

#define SAMPLERATE_LONGTEXT N_("Audio sample rate in Hertz. Default is 48000 Hz.")

#define CHANNELS_TEXT N_("Audio channels")

#define CHANNELS_LONGTEXT N_("Audio channels in input stream. Default is 2 (stereo).")

#define FOURCC_TEXT N_("FOURCC code of raw input format")

#define FOURCC_LONGTEXT N_( \

    "FOURCC code of the raw input format. This is a four character string." )

#define LANG_TEXT N_("Forces the audio language")

#define LANG_LONGTEXT N_("Forces the audio language for the output mux. Three letter ISO639 code. Default is 'eng'.")

#ifdef WORDS_BIGENDIAN

# define FOURCC_DEFAULT "s16b"

#else

# define FOURCC_DEFAULT "s16l"

#endif

vlc_module_begin()

    set_shortname( "Raw Audio" )

    set_description( N_("Raw audio demuxer") )

    set_capability( "demux", 0 )

    set_subcategory( SUBCAT_INPUT_DEMUX )

    set_callbacks( Open, Close )

    add_shortcut( "rawaud" )

    add_integer_with_range( "rawaud-channels", 2, 1, 32, CHANNELS_TEXT, CHANNELS_LONGTEXT )

        change_safe()

    add_integer_with_range( "rawaud-samplerate", 48000, 1, 384000, SAMPLERATE_TEXT, SAMPLERATE_LONGTEXT )

        change_safe()

    add_string( "rawaud-fourcc", FOURCC_DEFAULT,

                FOURCC_TEXT, FOURCC_LONGTEXT )

        change_safe()

    add_string( "rawaud-lang", "eng", LANG_TEXT, LANG_LONGTEXT)

vlc_module_end()

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

 * Definitions of structures used by this plugin

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

typedef struct

{

    es_out_id_t *p_es;

    es_format_t  fmt;

    unsigned int i_frame_size;

    unsigned int i_frame_samples;

    unsigned int i_seek_step;

    date_t       pts;

} demux_sys_t;

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

 * Local prototypes

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

static int Demux( demux_t * );

static int Control( demux_t *, int i_query, va_list args );

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

 * Open: initializes raw audio demuxer

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

static int Open( vlc_object_t * p_this )

{

    demux_t     *p_demux = (demux_t*)p_this;

    demux_sys_t *p_sys;

    p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );

    if( !p_sys )

        return VLC_ENOMEM;

    char *psz_fourcc = var_InheritString( p_demux, "rawaud-fourcc" );

    es_format_Init( &p_sys->fmt, AUDIO_ES,

                    vlc_fourcc_GetCodecFromString( AUDIO_ES, psz_fourcc ) );

    free( psz_fourcc );

    if( !p_sys->fmt.i_codec )

    {

        msg_Err( p_demux, "rawaud-fourcc must be a 4 character string");

        es_format_Clean( &p_sys->fmt );

        free( p_sys );

        return VLC_EGENERIC;

    }

    // get the bits per sample ratio based on codec

    switch( p_sys->fmt.i_codec )

    {

        case VLC_CODEC_FL64:

            p_sys->fmt.audio.i_bitspersample = 64;

            break;

        case VLC_CODEC_FL32:

        case VLC_CODEC_S32L:

        case VLC_CODEC_S32B:

            p_sys->fmt.audio.i_bitspersample = 32;

            break;

        case VLC_CODEC_S24L:

        case VLC_CODEC_S24B:

            p_sys->fmt.audio.i_bitspersample = 24;

            break;

        case VLC_CODEC_S16L:

        case VLC_CODEC_S16B:

            p_sys->fmt.audio.i_bitspersample = 16;

            break;

        case VLC_CODEC_S8:

        case VLC_CODEC_U8:

            p_sys->fmt.audio.i_bitspersample = 8;

            break;

        default:

            msg_Err( p_demux, "unknown fourcc format %4.4s",

                    (char *)&p_sys->fmt.i_codec);

            es_format_Clean( &p_sys->fmt );

            free( p_sys );

            return VLC_EGENERIC;

    }

    p_sys->fmt.psz_language = var_CreateGetString( p_demux, "rawaud-lang" );

    p_sys->fmt.audio.i_channels = var_CreateGetInteger( p_demux, "rawaud-channels" );

    p_sys->fmt.audio.i_rate = var_CreateGetInteger( p_demux, "rawaud-samplerate" );

    p_sys->fmt.i_bitrate = p_sys->fmt.audio.i_rate *

                           p_sys->fmt.audio.i_channels *

                           p_sys->fmt.audio.i_bitspersample;

    if( p_sys->fmt.i_bitrate > 50000000)

    {

        msg_Err( p_demux, "invalid bitrate");

        es_format_Clean( &p_sys->fmt );

        free( p_sys );

        return VLC_EGENERIC;

    }

    msg_Dbg( p_demux,

            "format initialized: channels=%d , samplerate=%d Hz, fourcc=%4.4s, bits per sample = %d, bitrate = %d bit/s",

            p_sys->fmt.audio.i_channels,

            p_sys->fmt.audio.i_rate,

            (char*)&p_sys->fmt.i_codec,

            p_sys->fmt.audio.i_bitspersample,

            p_sys->fmt.i_bitrate);

    /* add the es */

    p_sys->fmt.i_id = 0;

    p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );

    if( unlikely(!p_sys->p_es) )

    {

        es_format_Clean( &p_sys->fmt );

        free( p_sys );

        return VLC_EGENERIC;

    }

    msg_Dbg( p_demux, "elementary stream added");

    /* initialize timing */

    date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );

    date_Set( &p_sys->pts, VLC_TICK_0 );

    /* calculate 50ms frame size/time */

    p_sys->i_frame_samples = __MAX( p_sys->fmt.audio.i_rate / 20, 1 );

    p_sys->i_seek_step  = p_sys->fmt.audio.i_channels *

                          ( (p_sys->fmt.audio.i_bitspersample + 7) / 8 );

    p_sys->i_frame_size = p_sys->i_frame_samples * p_sys->i_seek_step;

    msg_Dbg( p_demux, "frame size is %d bytes ", p_sys->i_frame_size);

    p_demux->pf_demux   = Demux;

    p_demux->pf_control = Control;

    return VLC_SUCCESS;

}

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

 * Close: frees unused data

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

static void Close( vlc_object_t *p_this )

{

    demux_t     *p_demux = (demux_t*)p_this;

    demux_sys_t *p_sys  = p_demux->p_sys;

    es_format_Clean( &p_sys->fmt );

    free( p_sys );

}

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

 * Demux: reads and demuxes data packets

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

 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise

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

static int Demux( demux_t *p_demux )

{

    demux_sys_t *p_sys  = p_demux->p_sys;

    block_t     *p_block;

    p_block = vlc_stream_Block( p_demux->s, p_sys->i_frame_size );

    if( p_block == NULL )

        return VLC_DEMUXER_EOF;

    p_block->i_dts = p_block->i_pts = date_Get( &p_sys->pts );

    es_out_SetPCR( p_demux->out, p_block->i_pts );

    es_out_Send( p_demux->out, p_sys->p_es, p_block );

    date_Increment( &p_sys->pts, p_sys->i_frame_samples );

    return VLC_DEMUXER_SUCCESS;

}

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

 * Control:

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

static int Control( demux_t *p_demux, int i_query, va_list args )

{

    demux_sys_t *p_sys  = p_demux->p_sys;

    return demux_vaControlHelper( p_demux->s, 0, -1,

                                  p_sys->fmt.i_bitrate, p_sys->i_seek_step, i_query, args );

}