239 lines
6.8 KiB
C
239 lines
6.8 KiB
C
/*
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** Copyright (C) 2006 Paul Davis <paul@linuxaudiosystems.com>
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** Copyright (C) 2006-2009 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU Lesser General Public License as published by
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** the Free Software Foundation; either version 2.1 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <string.h>
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#include "common.h"
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static void strncpy_crlf (char *dest, const char *src, size_t destmax, size_t srcmax) ;
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static int gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo) ;
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static inline size_t
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bc_min_size (const SF_BROADCAST_INFO* info)
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{ if (info == NULL)
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return 0 ;
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return offsetof (SF_BROADCAST_INFO, coding_history) + info->coding_history_size ;
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} /* broadcast_size */
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static inline size_t
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bc_var_coding_hist_size (const SF_BROADCAST_VAR* var)
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{ return var->size - offsetof (SF_BROADCAST_VAR, binfo.coding_history) ;
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} /* broadcast_size */
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SF_BROADCAST_VAR*
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broadcast_var_alloc (size_t datasize)
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{ SF_BROADCAST_VAR * data ;
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if ((data = calloc (1, datasize)) != NULL)
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data->size = datasize ;
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return data ;
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} /* broadcast_var_alloc */
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int
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broadcast_var_set (SF_PRIVATE *psf, const SF_BROADCAST_INFO * info, size_t datasize)
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{ char added_history [256] ;
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int added_history_len, len ;
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if (info == NULL)
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return SF_FALSE ;
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if (bc_min_size (info) > datasize)
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{ psf->error = SFE_BAD_BROADCAST_INFO_SIZE ;
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return SF_FALSE ;
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} ;
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added_history_len = gen_coding_history (added_history, sizeof (added_history), &(psf->sf)) ;
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if (psf->broadcast_var != NULL)
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{ size_t coding_hist_offset = offsetof (SF_BROADCAST_INFO, coding_history) ;
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if (psf->broadcast_var->binfo.coding_history_size + added_history_len < datasize - coding_hist_offset)
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{ free (psf->broadcast_var) ;
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psf->broadcast_var = NULL ;
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} ;
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} ;
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if (psf->broadcast_var == NULL)
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{ int size = datasize + added_history_len + 512 ;
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psf->broadcast_var = calloc (1, size) ;
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psf->broadcast_var->size = size ;
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} ;
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memcpy (&(psf->broadcast_var->binfo), info, offsetof (SF_BROADCAST_INFO, coding_history)) ;
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strncpy_crlf (psf->broadcast_var->binfo.coding_history, info->coding_history, bc_var_coding_hist_size (psf->broadcast_var), info->coding_history_size) ;
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len = strlen (psf->broadcast_var->binfo.coding_history) ;
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if (len > 0 && psf->broadcast_var->binfo.coding_history [len] != '\n')
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strncat (psf->broadcast_var->binfo.coding_history, "\r\n", 2) ;
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if (psf->mode == SFM_WRITE)
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strncat (psf->broadcast_var->binfo.coding_history, added_history, strlen (added_history)) ;
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psf->broadcast_var->binfo.coding_history_size = strlen (psf->broadcast_var->binfo.coding_history) ;
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/* Fore coding_history_size to be even. */
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psf->broadcast_var->binfo.coding_history_size += (psf->broadcast_var->binfo.coding_history_size & 1) ? 1 : 0 ;
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/* Currently writing this version. */
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psf->broadcast_var->binfo.version = 1 ;
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return SF_TRUE ;
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} /* broadcast_var_set */
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int
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broadcast_var_get (SF_PRIVATE *psf, SF_BROADCAST_INFO * data, size_t datasize)
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{ size_t size ;
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if (psf->broadcast_var == NULL)
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return SF_FALSE ;
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size = SF_MIN (datasize, bc_min_size (&(psf->broadcast_var->binfo))) ;
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memcpy (data, &(psf->broadcast_var->binfo), size) ;
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return SF_TRUE ;
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} /* broadcast_var_set */
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/*------------------------------------------------------------------------------
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** Strncpy which converts all line endings to CR/LF.
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*/
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static void
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strncpy_crlf (char *dest, const char *src, size_t destmax, size_t srcmax)
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{ char * destend = dest + destmax - 1 ;
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const char * srcend = src + srcmax ;
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while (dest < destend && src < srcend)
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{ if ((src [0] == '\r' && src [1] == '\n') || (src [0] == '\n' && src [1] == '\r'))
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{ *dest++ = '\r' ;
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*dest++ = '\n' ;
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src += 2 ;
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continue ;
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} ;
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if (src [0] == '\r')
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{ *dest++ = '\r' ;
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*dest++ = '\n' ;
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src += 1 ;
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continue ;
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} ;
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if (src [0] == '\n')
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{ *dest++ = '\r' ;
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*dest++ = '\n' ;
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src += 1 ;
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continue ;
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} ;
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*dest++ = *src++ ;
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} ;
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/* Make sure dest is terminated. */
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*dest = 0 ;
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} /* strncpy_crlf */
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static int
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gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo)
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{ char chnstr [16] ;
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int count, width ;
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/*
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** From : http://www.sr.se/utveckling/tu/bwf/docs/codhist2.htm
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**
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** Parameter Variable string <allowed option> Unit
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** ==========================================================================================
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** Coding Algorithm A=<ANALOGUE, PCM, MPEG1L1, MPEG1L2, MPEG1L3,
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** MPEG2L1, MPEG2L2, MPEG2L3>
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** Sampling frequency F=<11000,22050,24000,32000,44100,48000> [Hz]
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** Bit-rate B=<any bit-rate allowed in MPEG 2 (ISO/IEC [kbit/s per channel]
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** 13818-3)>
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** Word Length W=<8, 12, 14, 16, 18, 20, 22, 24> [bits]
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** Mode M=<mono, stereo, dual-mono, joint-stereo>
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** Text, free string T=<a free ASCII-text string for in house use.
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** This string should contain no commas (ASCII
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** 2Chex). Examples of the contents: ID-No; codec
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** type; A/D type>
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*/
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switch (psfinfo->channels)
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{ case 0 :
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return SF_FALSE ;
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case 1 :
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strncpy (chnstr, "mono", sizeof (chnstr)) ;
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break ;
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case 2 :
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strncpy (chnstr, "stereo", sizeof (chnstr)) ;
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break ;
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default :
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snprintf (chnstr, sizeof (chnstr), "%uchn", psfinfo->channels) ;
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break ;
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} ;
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switch (SF_CODEC (psfinfo->format))
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{ case SF_FORMAT_PCM_U8 :
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case SF_FORMAT_PCM_S8 :
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width = 8 ;
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break ;
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case SF_FORMAT_PCM_16 :
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width = 16 ;
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break ;
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case SF_FORMAT_PCM_24 :
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width = 24 ;
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break ;
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case SF_FORMAT_PCM_32 :
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width = 32 ;
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break ;
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case SF_FORMAT_FLOAT :
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width = 24 ; /* Bits in the mantissa + 1 */
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break ;
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case SF_FORMAT_DOUBLE :
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width = 53 ; /* Bits in the mantissa + 1 */
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break ;
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case SF_FORMAT_ULAW :
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case SF_FORMAT_ALAW :
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width = 12 ;
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break ;
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default :
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width = 42 ;
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break ;
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} ;
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count = snprintf (added_history, added_history_max,
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"A=PCM,F=%u,W=%hu,M=%s,T=%s-%s\r\n",
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psfinfo->samplerate, width, chnstr, PACKAGE, VERSION) ;
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if (count >= added_history_max)
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return 0 ;
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return count ;
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} /* gen_coding_history */
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