araw.c

video linux conference

/*****************************************************************************
 * araw.c: Pseudo audio decoder; for raw pcm data
 *****************************************************************************
 * Copyright (C) 2001, 2003 VideoLAN
 * $Id: araw.c 10380 2005-03-17 21:50:29Z gbazin $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/decoder.h>

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  DecoderOpen ( vlc_object_t * );
static void DecoderClose( vlc_object_t * );

#ifdef ENABLE_SOUT
static int  EncoderOpen ( vlc_object_t * );
static void EncoderClose( vlc_object_t * );
#endif

vlc_module_begin();
    /* audio decoder module */
    set_description( _("Raw/Log Audio decoder") );
    set_capability( "decoder", 100 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_ACODEC );
    set_callbacks( DecoderOpen, DecoderClose );

#ifdef ENABLE_SOUT
    /* audio encoder submodule */
    add_submodule();
    set_description( _("Raw audio encoder") );
    set_capability( "encoder", 150 );
    set_callbacks( EncoderOpen, EncoderClose );
#endif
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
static block_t *EncoderEncode( encoder_t *, aout_buffer_t * );

struct decoder_sys_t
{
    int16_t *p_logtos16;  /* used with m/alaw to int16_t */

    audio_date_t end_date;
};

static int pi_channels_maps[] =
{
    0,
    AOUT_CHAN_CENTER,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
     | AOUT_CHAN_REARRIGHT,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
     | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT,
    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
     | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE
};

static int16_t ulawtos16[256] =
{
    -32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
    -23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
    -15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
    -11900, -11388, -10876, -10364,  -9852,  -9340,  -8828,  -8316,
     -7932,  -7676,  -7420,  -7164,  -6908,  -6652,  -6396,  -6140,
     -5884,  -5628,  -5372,  -5116,  -4860,  -4604,  -4348,  -4092,
     -3900,  -3772,  -3644,  -3516,  -3388,  -3260,  -3132,  -3004,
     -2876,  -2748,  -2620,  -2492,  -2364,  -2236,  -2108,  -1980,
     -1884,  -1820,  -1756,  -1692,  -1628,  -1564,  -1500,  -1436,
     -1372,  -1308,  -1244,  -1180,  -1116,  -1052,   -988,   -924,
      -876,   -844,   -812,   -780,   -748,   -716,   -684,   -652,
      -620,   -588,   -556,   -524,   -492,   -460,   -428,   -396,
      -372,   -356,   -340,   -324,   -308,   -292,   -276,   -260,
      -244,   -228,   -212,   -196,   -180,   -164,   -148,   -132,
      -120,   -112,   -104,    -96,    -88,    -80,    -72,    -64,
       -56,    -48,    -40,    -32,    -24,    -16,     -8,      0,
     32124,  31100,  30076,  29052,  28028,  27004,  25980,  24956,
     23932,  22908,  21884,  20860,  19836,  18812,  17788,  16764,
     15996,  15484,  14972,  14460,  13948,  13436,  12924,  12412,
     11900,  11388,  10876,  10364,   9852,   9340,   8828,   8316,
      7932,   7676,   7420,   7164,   6908,   6652,   6396,   6140,
      5884,   5628,   5372,   5116,   4860,   4604,   4348,   4092,
      3900,   3772,   3644,   3516,   3388,   3260,   3132,   3004,
      2876,   2748,   2620,   2492,   2364,   2236,   2108,   1980,
      1884,   1820,   1756,   1692,   1628,   1564,   1500,   1436,
      1372,   1308,   1244,   1180,   1116,   1052,    988,    924,
       876,    844,    812,    780,    748,    716,    684,    652,
       620,    588,    556,    524,    492,    460,    428,    396,
       372,    356,    340,    324,    308,    292,    276,    260,
       244,    228,    212,    196,    180,    164,    148,    132,
       120,    112,    104,     96,     88,     80,     72,     64,
        56,     48,     40,     32,     24,     16,      8,      0
};

static int16_t alawtos16[256] =
{
     -5504,  -5248,  -6016,  -5760,  -4480,  -4224,  -4992,  -4736,
     -7552,  -7296,  -8064,  -7808,  -6528,  -6272,  -7040,  -6784,
     -2752,  -2624,  -3008,  -2880,  -2240,  -2112,  -2496,  -2368,
     -3776,  -3648,  -4032,  -3904,  -3264,  -3136,  -3520,  -3392,
    -22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
    -30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
    -11008, -10496, -12032, -11520,  -8960,  -8448,  -9984,  -9472,
    -15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
      -344,   -328,   -376,   -360,   -280,   -264,   -312,   -296,
      -472,   -456,   -504,   -488,   -408,   -392,   -440,   -424,
       -88,    -72,   -120,   -104,    -24,     -8,    -56,    -40,
      -216,   -200,   -248,   -232,   -152,   -136,   -184,   -168,
     -1376,  -1312,  -1504,  -1440,  -1120,  -1056,  -1248,  -1184,
     -1888,  -1824,  -2016,  -1952,  -1632,  -1568,  -1760,  -1696,
      -688,   -656,   -752,   -720,   -560,   -528,   -624,   -592,
      -944,   -912,  -1008,   -976,   -816,   -784,   -880,   -848,
      5504,   5248,   6016,   5760,   4480,   4224,   4992,   4736,
      7552,   7296,   8064,   7808,   6528,   6272,   7040,   6784,
      2752,   2624,   3008,   2880,   2240,   2112,   2496,   2368,
      3776,   3648,   4032,   3904,   3264,   3136,   3520,   3392,
     22016,  20992,  24064,  23040,  17920,  16896,  19968,  18944,
     30208,  29184,  32256,  31232,  26112,  25088,  28160,  27136,
     11008,  10496,  12032,  11520,   8960,   8448,   9984,   9472,
     15104,  14592,  16128,  15616,  13056,  12544,  14080,  13568,
       344,    328,    376,    360,    280,    264,    312,    296,
       472,    456,    504,    488,    408,    392,    440,    424,
        88,     72,    120,    104,     24,      8,     56,     40,
       216,    200,    248,    232,    152,    136,    184,    168,
      1376,   1312,   1504,   1440,   1120,   1056,   1248,   1184,
      1888,   1824,   2016,   1952,   1632,   1568,   1760,   1696,
       688,    656,    752,    720,    560,    528,    624,    592,
       944,    912,   1008,    976,    816,    784,    880,    848
};

/*****************************************************************************
 * DecoderOpen: probe the decoder and return score
 *****************************************************************************/
static int DecoderOpen( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;

    switch( p_dec->fmt_in.i_codec )
    {
    /* from wav/avi/asf file */
    case VLC_FOURCC('a','r','a','w'):
    case VLC_FOURCC('a','f','l','t'):
    /* _signed_ big endian samples (mov)*/
    case VLC_FOURCC('t','w','o','s'):
    /* _signed_ little endian samples (mov)*/
    case VLC_FOURCC('s','o','w','t'):

    case VLC_FOURCC('a','l','a','w'):
    case VLC_FOURCC('u','l','a','w'):
    case VLC_FOURCC('m','l','a','w'):

    case VLC_FOURCC('f','l','6','4'):
    case VLC_FOURCC('f','l','3','2'):
    case VLC_FOURCC('s','3','2','l'):
    case VLC_FOURCC('s','3','2','b'):
    case VLC_FOURCC('s','2','4','l'):
    case VLC_FOURCC('s','2','4','b'):
    case VLC_FOURCC('s','1','6','l'):
    case VLC_FOURCC('s','1','6','b'):
    case VLC_FOURCC('s','8',' ',' '):
    case VLC_FOURCC('u','8',' ',' '):
        break;

    default:
        return VLC_EGENERIC;
    }

    if( p_dec->fmt_in.audio.i_channels <= 0 ||
        p_dec->fmt_in.audio.i_channels > 8 )
    {
        msg_Err( p_dec, "bad channels count (1-8)" );
        return VLC_EGENERIC;
    }

    if( p_dec->fmt_in.audio.i_rate <= 0 )
    {
        msg_Err( p_dec, "bad samplerate" );
        return VLC_EGENERIC;
    }

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys =
          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
    {
        msg_Err( p_dec, "out of memory" );
        return VLC_EGENERIC;
    }

    p_sys->p_logtos16 = NULL;