araw.c
上传用户:riyaled888
上传日期:2009-03-27
资源大小:7338k
文件大小:20k
- /*****************************************************************************
- * araw.c: Pseudo audio decoder; for raw pcm data
- *****************************************************************************
- * Copyright (C) 2001, 2003 VideoLAN
- * $Id: araw.c 8867 2004-09-30 21:23:28Z gbazin $
- *
- * Authors: Laurent Aimar <fenrir@via.ecp.fr>
- *
- * 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 * );
- static int EncoderOpen ( vlc_object_t * );
- static void EncoderClose( vlc_object_t * );
- vlc_module_begin();
- /* audio decoder module */
- set_description( _("Raw/Log Audio decoder") );
- set_capability( "decoder", 100 );
- set_callbacks( DecoderOpen, DecoderClose );
- /* audio encoder submodule */
- add_submodule();
- set_description( _("Raw audio encoder") );
- set_capability( "encoder", 150 );
- set_callbacks( EncoderOpen, EncoderClose );
- 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;
- msg_Dbg( p_dec, "samplerate:%dHz channels:%d bits/sample:%d",
- p_dec->fmt_in.audio.i_rate, p_dec->fmt_in.audio.i_channels,
- p_dec->fmt_in.audio.i_bitspersample );
- if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', '6', '4' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 64;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', '3', '2' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 32;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '3', '2', 'l' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '3', '2', 'b' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 32;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '2', '4', 'l' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '2', '4', 'b' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 24;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '1', '6', 'l' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '1', '6', 'b' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 16;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', '8', ' ', ' ' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', '8', ' ', ' ' ) )
- {
- p_dec->fmt_out.i_codec = p_dec->fmt_in.i_codec;
- p_dec->fmt_in.audio.i_bitspersample = 8;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'f', 'l', 't' ) )
- {
- switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
- {
- case 4:
- p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
- break;
- case 8:
- p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','6','4');
- break;
- default:
- msg_Err( p_dec, "bad parameters(bits/sample)" );
- return VLC_EGENERIC;
- }
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'r', 'a', 'w' ) )
- {
- switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
- {
- case 1:
- p_dec->fmt_out.i_codec = VLC_FOURCC('u','8',' ',' ');
- break;
- case 2:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','l');
- break;
- case 3:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','l');
- break;
- case 4:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','l');
- break;
- default:
- msg_Err( p_dec, "bad parameters(bits/sample)" );
- return VLC_EGENERIC;
- }
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 't', 'w', 'o', 's' ) )
- {
- switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
- {
- case 1:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','8',' ',' ');
- break;
- case 2:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','b');
- break;
- case 3:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','b');
- break;
- case 4:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','b');
- break;
- default:
- msg_Err( p_dec, "bad parameters(bits/sample)" );
- return VLC_EGENERIC;
- }
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 's', 'o', 'w', 't' ) )
- {
- switch( ( p_dec->fmt_in.audio.i_bitspersample + 7 ) / 8 )
- {
- case 1:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','8',' ',' ');
- break;
- case 2:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','1','6','l');
- break;
- case 3:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','2','4','l');
- break;
- case 4:
- p_dec->fmt_out.i_codec = VLC_FOURCC('s','3','2','l');
- break;
- default:
- msg_Err( p_dec, "bad parameters(bits/sample)" );
- return VLC_EGENERIC;
- }
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'w' ) )
- {
- p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
- p_sys->p_logtos16 = alawtos16;
- p_dec->fmt_in.audio.i_bitspersample = 8;
- }
- else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', 'l', 'a', 'w' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 'm', 'l', 'a', 'w' ) )
- {
- p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
- p_sys->p_logtos16 = ulawtos16;
- p_dec->fmt_in.audio.i_bitspersample = 8;
- }
- /* Set output properties */
- p_dec->fmt_out.i_cat = AUDIO_ES;
- 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_bitspersample = p_dec->fmt_in.audio.i_bitspersample;
- 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];
- if( p_dec->fmt_in.audio.i_physical_channels )
- p_dec->fmt_out.audio.i_physical_channels =
- p_dec->fmt_in.audio.i_physical_channels;
- if( p_dec->fmt_in.audio.i_original_channels )
- p_dec->fmt_out.audio.i_original_channels =
- p_dec->fmt_in.audio.i_original_channels;
- if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'w' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 'u', 'l', 'a', 'w' ) ||
- p_dec->fmt_in.i_codec == VLC_FOURCC( 'm', 'l', 'a', 'w' ) )
- {
- p_dec->fmt_out.audio.i_bitspersample = 16;
- }
- 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: the whole thing
- ****************************************************************************
- * This function must be fed with whole samples (see nBlockAlign).
- ****************************************************************************/
- 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;
- aout_buffer_t *p_out;
- int i_samples;
- 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;
- i_samples = p_block->i_buffer * 8 / p_dec->fmt_in.audio.i_bitspersample /
- p_dec->fmt_in.audio.i_channels;
- if( i_samples <= 0 )
- {
- block_Release( p_block );
- return NULL;
- }
- /* Create chunks of max 1024 samples */
- i_samples = __MIN( i_samples, 1024 );
- p_out = p_dec->pf_aout_buffer_new( p_dec, i_samples );
- 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, i_samples );
- if( p_sys->p_logtos16 )
- {
- int16_t *s = (int16_t*)p_out->p_buffer;
- unsigned int i;
- for( i = 0; i < p_out->i_nb_bytes / 2; i++ )
- {
- *s++ = p_sys->p_logtos16[*p_block->p_buffer++];
- p_block->i_buffer--;
- }
- }
- else
- {
- memcpy( p_out->p_buffer, p_block->p_buffer, p_out->i_nb_bytes );
- p_block->p_buffer += p_out->i_nb_bytes;
- p_block->i_buffer -= p_out->i_nb_bytes;
- }
- return p_out;
- }
- /*****************************************************************************
- * DecoderClose: decoder destruction
- *****************************************************************************/
- static void DecoderClose( vlc_object_t *p_this )
- {
- decoder_t *p_dec = (decoder_t *)p_this;
- free( p_dec->p_sys );
- }
- /*****************************************************************************
- * EncoderOpen:
- *****************************************************************************/
- static int EncoderOpen( vlc_object_t *p_this )
- {
- encoder_t *p_enc = (encoder_t *)p_this;
- if( p_enc->fmt_out.i_codec == VLC_FOURCC('u','8',' ',' ') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','8',' ',' ') )
- {
- p_enc->fmt_out.audio.i_bitspersample = 8;
- }
- else if( p_enc->fmt_out.i_codec == VLC_FOURCC('u','1','6','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('u','1','6','b') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','1','6','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','1','6','b') )
- {
- p_enc->fmt_out.audio.i_bitspersample = 16;
- }
- else if( p_enc->fmt_out.i_codec == VLC_FOURCC('u','2','4','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('u','2','4','b') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','2','4','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','2','4','b') )
- {
- p_enc->fmt_out.audio.i_bitspersample = 24;
- }
- else if( p_enc->fmt_out.i_codec == VLC_FOURCC('u','3','2','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('u','3','2','b') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','3','2','l') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('s','3','2','b') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('f','i','3','2') ||
- p_enc->fmt_out.i_codec == VLC_FOURCC('f','l','3','2') )
- {
- p_enc->fmt_out.audio.i_bitspersample = 32;
- }
- else if( p_enc->fmt_out.i_codec == VLC_FOURCC('f','l','6','4') )
- {
- p_enc->fmt_out.audio.i_bitspersample = 64;
- }
- else
- {
- return VLC_EGENERIC;
- }
- p_enc->p_sys = NULL;
- p_enc->pf_encode_audio = EncoderEncode;
- p_enc->fmt_in.i_codec = p_enc->fmt_out.i_codec;
- return VLC_SUCCESS;
- }
- /*****************************************************************************
- * EncoderClose:
- *****************************************************************************/
- static void EncoderClose ( vlc_object_t *p_this )
- {
- return;
- }
- /*****************************************************************************
- * EncoderEncode:
- *****************************************************************************/
- static block_t *EncoderEncode( encoder_t *p_enc, aout_buffer_t *p_aout_buf )
- {
- block_t *p_block = NULL;
- if( !p_aout_buf || !p_aout_buf->i_nb_bytes ) return NULL;
- if( ( p_block = block_New( p_enc, p_aout_buf->i_nb_bytes ) ) )
- {
- memcpy( p_block->p_buffer, p_aout_buf->p_buffer,
- p_aout_buf->i_nb_bytes );
- }
- if( p_block )
- {
- p_block->i_dts = p_block->i_pts = p_aout_buf->start_date;
- p_block->i_length = (int64_t)p_aout_buf->i_nb_samples *
- (int64_t)1000000 / p_enc->fmt_in.audio.i_rate;
- }
- return p_block;
- }