/***************************************************************************** * adpcm.c : adpcm variant audio decoder ***************************************************************************** * Copyright (C) 2001, 2002 the VideoLAN team * $Id: adpcm.c 14989 2006-03-30 22:58:23Z xtophe $ * * Authors: Laurent Aimar <fenrir@via.ecp.fr> *          Rémi Denis-Courmont <rem # videolan.org> * * 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. *****************************************************************************//***************************************************************************** * Preamble * * Documentation: http://www.pcisys.net/~melanson/codecs/adpcm.txt *****************************************************************************/#include <vlc/vlc.h>#include <vlc/decoder.h>/***************************************************************************** * Module descriptor *****************************************************************************/static int  OpenDecoder( vlc_object_t * );static void CloseDecoder( vlc_object_t * );static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );vlc_module_begin();    set_description( _("ADPCM audio decoder") );    set_capability( "decoder", 50 );    set_category( CAT_INPUT );    set_subcategory( SUBCAT_INPUT_ACODEC );    set_callbacks( OpenDecoder, CloseDecoder );vlc_module_end();/***************************************************************************** * Local prototypes *****************************************************************************/enum adpcm_codec_e{    ADPCM_IMA_QT,    ADPCM_IMA_WAV,    ADPCM_MS,    ADPCM_DK3,    ADPCM_DK4,    ADPCM_EA};struct decoder_sys_t{    enum adpcm_codec_e codec;    int                 i_block;    int                 i_samplesperblock;    audio_date_t        end_date;};static void DecodeAdpcmMs    ( decoder_t *, int16_t *, uint8_t * );static void DecodeAdpcmImaWav( decoder_t *, int16_t *, uint8_t * );static void DecodeAdpcmImaQT ( decoder_t *, int16_t *, uint8_t * );static void DecodeAdpcmDk4   ( decoder_t *, int16_t *, uint8_t * );static void DecodeAdpcmDk3   ( decoder_t *, int16_t *, uint8_t * );static void DecodeAdpcmEA    ( decoder_t *, int16_t *, uint8_t * );static int pi_channels_maps[6] ={    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_REARLEFT,    AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER     | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARLEFT};/* Various table from http://www.pcisys.net/~melanson/codecs/adpcm.txt */static int i_index_table[16] ={    -1, -1, -1, -1, 2, 4, 6, 8,    -1, -1, -1, -1, 2, 4, 6, 8};static int i_step_table[89] ={    7, 8, 9, 10, 11, 12, 13, 14, 16, 17,    19, 21, 23, 25, 28, 31, 34, 37, 41, 45,    50, 55, 60, 66, 73, 80, 88, 97, 107, 118,    130, 143, 157, 173, 190, 209, 230, 253, 279, 307,    337, 371, 408, 449, 494, 544, 598, 658, 724, 796,    876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,    2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,    5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767};static int i_adaptation_table[16] ={    230, 230, 230, 230, 307, 409, 512, 614,    768, 614, 512, 409, 307, 230, 230, 230};static int i_adaptation_coeff1[7] ={    256, 512, 0, 192, 240, 460, 392};static int i_adaptation_coeff2[7] ={    0, -256, 0, 64, 0, -208, -232};/***************************************************************************** * OpenDecoder: probe the decoder and return score *****************************************************************************/static int OpenDecoder( 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 )    {        case VLC_FOURCC('i','m','a', '4'): /* IMA ADPCM */        case VLC_FOURCC('m','s',0x00,0x02): /* MS ADPCM */        case VLC_FOURCC('m','s',0x00,0x11): /* IMA ADPCM */        case VLC_FOURCC('m','s',0x00,0x61): /* Duck DK4 ADPCM */        case VLC_FOURCC('m','s',0x00,0x62): /* Duck DK3 ADPCM */        case VLC_FOURCC('X','A','J', 0): /* EA ADPCM */            break;        default:            return VLC_EGENERIC;    }    if( p_dec->fmt_in.audio.i_channels <= 0 ||        p_dec->fmt_in.audio.i_channels > 5 )    {        msg_Err( p_dec, "invalid number of channel (not between 1 and 5): %i",                  p_dec->fmt_in.audio.i_channels );        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_ENOMEM;    }    switch( p_dec->fmt_in.i_codec )    {        case VLC_FOURCC('i','m','a', '4'): /* IMA ADPCM */            p_sys->codec = ADPCM_IMA_QT;            break;        case VLC_FOURCC('m','s',0x00,0x11): /* IMA ADPCM */            p_sys->codec = ADPCM_IMA_WAV;            break;        case VLC_FOURCC('m','s',0x00,0x02): /* MS ADPCM */            p_sys->codec = ADPCM_MS;            break;        case VLC_FOURCC('m','s',0x00,0x61): /* Duck DK4 ADPCM */            p_sys->codec = ADPCM_DK4;            break;        case VLC_FOURCC('m','s',0x00,0x62): /* Duck DK3 ADPCM */            p_sys->codec = ADPCM_DK3;            break;        case VLC_FOURCC('X','A','J', 0): /* EA ADPCM */            p_sys->codec = ADPCM_EA;            p_dec->fmt_in.p_extra = calloc( 2 * p_dec->fmt_in.audio.i_channels,                                            sizeof( int16_t ) );            if( p_dec->fmt_in.p_extra == NULL )            {                free( p_sys );                return VLC_ENOMEM;            }            break;    }    if( p_dec->fmt_in.audio.i_blockalign <= 0 )    {        p_sys->i_block = (p_sys->codec == ADPCM_IMA_QT) ?            34 * p_dec->fmt_in.audio.i_channels : 1024;        msg_Warn( p_dec, "block size undefined, using %d", p_sys->i_block );    }    else    {        p_sys->i_block = p_dec->fmt_in.audio.i_blockalign;    }    /* calculate samples per block */    switch( p_sys->codec )    {    case ADPCM_IMA_QT:        p_sys->i_samplesperblock = 64;        break;    case ADPCM_IMA_WAV:        p_sys->i_samplesperblock =            2 * ( p_sys->i_block - 4 * p_dec->fmt_in.audio.i_channels ) /            p_dec->fmt_in.audio.i_channels;        break;    case ADPCM_MS:        p_sys->i_samplesperblock =            2 * (p_sys->i_block - 7 * p_dec->fmt_in.audio.i_channels) /            p_dec->fmt_in.audio.i_channels + 2;        break;    case ADPCM_DK4:        p_sys->i_samplesperblock =            2 * (p_sys->i_block - 4 * p_dec->fmt_in.audio.i_channels) /            p_dec->fmt_in.audio.i_channels + 1;        break;    case ADPCM_DK3:        p_dec->fmt_in.audio.i_channels = 2;        p_sys->i_samplesperblock = ( 4 * ( p_sys->i_block - 16 ) + 2 )/ 3;        break;    case ADPCM_EA:        p_sys->i_samplesperblock =            2 * (p_sys->i_block - p_dec->fmt_in.audio.i_channels) /            p_dec->fmt_in.audio.i_channels;    }    msg_Dbg( p_dec, "format: samplerate:%d Hz channels:%d bits/sample:%d "             "blockalign:%d samplesperblock:%d",             p_dec->fmt_in.audio.i_rate, p_dec->fmt_in.audio.i_channels,             p_dec->fmt_in.audio.i_bitspersample, p_sys->i_block,             p_sys->i_samplesperblock );    p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;    p_dec->fmt_out.audio.i_rate = p_dec->fmt_in.audio.i_rate;    p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels;    p_dec->fmt_out.audio.i_physical_channels =        p_dec->fmt_out.audio.i_original_channels =            pi_channels_maps[p_dec->fmt_in.audio.i_channels];    aout_DateInit( &p_sys->end_date, p_dec->fmt_out.audio.i_rate );    aout_DateSet( &p_sys->end_date, 0 );    p_dec->pf_decode_audio = DecodeBlock;    return VLC_SUCCESS;}/***************************************************************************** * DecodeBlock: *****************************************************************************/static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block ){    decoder_sys_t *p_sys  = p_dec->p_sys;    block_t *p_block;    if( !pp_block || !*pp_block ) return NULL;    p_block = *pp_block;    if( p_block->i_pts != 0 &&        p_block->i_pts != aout_DateGet( &p_sys->end_date ) )    {        aout_DateSet( &p_sys->end_date, p_block->i_pts );    }    else if( !aout_DateGet( &p_sys->end_date ) )    {        /* We've just started the stream, wait for the first PTS. */        block_Release( p_block );        return NULL;    }    /* Don't re-use the same pts twice */    p_block->i_pts = 0;    if( p_block->i_buffer >= p_sys->i_block )    {        aout_buffer_t *p_out;        p_out = p_dec->pf_aout_buffer_new( p_dec, p_sys->i_samplesperblock );        if( p_out == NULL )        {            block_Release( p_block );            return NULL;        }        p_out->start_date = aout_DateGet( &p_sys->end_date );        p_out->end_date =            aout_DateIncrement( &p_sys->end_date, p_sys->i_samplesperblock );        switch( p_sys->codec )        {        case ADPCM_IMA_QT:            DecodeAdpcmImaQT( p_dec, (int16_t*)p_out->p_buffer,                              p_block->p_buffer );            break;        case ADPCM_IMA_WAV:            DecodeAdpcmImaWav( p_dec, (int16_t*)p_out->p_buffer,                               p_block->p_buffer );            break;        case ADPCM_MS:            DecodeAdpcmMs( p_dec, (int16_t*)p_out->p_buffer,                           p_block->p_buffer );            break;        case ADPCM_DK4:            DecodeAdpcmDk4( p_dec, (int16_t*)p_out->p_buffer,                            p_block->p_buffer );            break;        case ADPCM_DK3:            DecodeAdpcmDk3( p_dec, (int16_t*)p_out->p_buffer,                            p_block->p_buffer );            break;        case ADPCM_EA:            DecodeAdpcmEA( p_dec, (int16_t*)p_out->p_buffer,                           p_block->p_buffer );        default:            break;        }        p_block->p_buffer += p_sys->i_block;        p_block->i_buffer -= p_sys->i_block;        return p_out;    }    block_Release( p_block );    return NULL;}/***************************************************************************** * CloseDecoder: *****************************************************************************/static void CloseDecoder( vlc_object_t *p_this ){    decoder_t *p_dec = (decoder_t *)p_this;    decoder_sys_t *p_sys = p_dec->p_sys;    if( p_sys->codec == ADPCM_EA )        free( p_dec->fmt_in.p_extra );    free( p_sys );}/***************************************************************************** * Local functions *****************************************************************************/#define CLAMP( v, min, max ) \    if( (v) < (min) ) (v) = (min); \    if( (v) > (max) ) (v) = (max)#define GetByte( v ) \    (v) = *p_buffer; p_buffer++;#define GetWord( v ) \    (v) = *p_buffer; p_buffer++; \    (v) |= ( *p_buffer ) << 8; p_buffer++; \    if( (v)&0x8000 ) (v) -= 0x010000;/* * MS */typedef struct adpcm_ms_channel_s{    int i_idelta;    int i_sample1, i_sample2;    int i_coeff1, i_coeff2;} adpcm_ms_channel_t;static int AdpcmMsExpandNibble(adpcm_ms_channel_t *p_channel,                               int i_nibble ){    int i_predictor;    int i_snibble;    /* expand sign */    i_snibble = i_nibble - ( i_nibble&0x08 ? 0x10 : 0 );    i_predictor = ( p_channel->i_sample1 * p_channel->i_coeff1 +                    p_channel->i_sample2 * p_channel->i_coeff2 ) / 256 +                  i_snibble * p_channel->i_idelta;    CLAMP( i_predictor, -32768, 32767 );    p_channel->i_sample2 = p_channel->i_sample1;