diff options
Diffstat (limited to 'src/broadcast.c')
| -rw-r--r-- | src/broadcast.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/broadcast.c b/src/broadcast.c new file mode 100644 index 0000000..975ee84 --- /dev/null +++ b/src/broadcast.c @@ -0,0 +1,190 @@ +/* +** Copyright (C) 2006-2011 Erik de Castro Lopo <erikd@mega-nerd.com> +** Copyright (C) 2006 Paul Davis <paul@linuxaudiosystems.com> +** +** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#include "sfconfig.h" + +#include <stdio.h> +#include <stddef.h> +#include <string.h> + +#include "common.h" + + +static int gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo) ; + +static inline size_t +bc_min_size (const SF_BROADCAST_INFO* info) +{ if (info == NULL) + return 0 ; + + return offsetof (SF_BROADCAST_INFO, coding_history) + info->coding_history_size ; +} /* bc_min_size */ + +SF_BROADCAST_INFO_16K* +broadcast_var_alloc (void) +{ return calloc (1, sizeof (SF_BROADCAST_INFO_16K)) ; +} /* broadcast_var_alloc */ + +int +broadcast_var_set (SF_PRIVATE *psf, const SF_BROADCAST_INFO * info, size_t datasize) +{ size_t len ; + + if (info == NULL) + return SF_FALSE ; + + if (bc_min_size (info) > datasize) + { psf->error = SFE_BAD_BROADCAST_INFO_SIZE ; + return SF_FALSE ; + } ; + + if (datasize >= sizeof (SF_BROADCAST_INFO_16K)) + { psf->error = SFE_BAD_BROADCAST_INFO_TOO_BIG ; + return SF_FALSE ; + } ; + + if (psf->broadcast_16k == NULL) + { if ((psf->broadcast_16k = broadcast_var_alloc ()) == NULL) + { psf->error = SFE_MALLOC_FAILED ; + return SF_FALSE ; + } ; + } ; + + memcpy (psf->broadcast_16k, info, offsetof (SF_BROADCAST_INFO, coding_history)) ; + + psf_strlcpy_crlf (psf->broadcast_16k->coding_history, info->coding_history, sizeof (psf->broadcast_16k->coding_history), datasize - offsetof (SF_BROADCAST_INFO, coding_history)) ; + len = strlen (psf->broadcast_16k->coding_history) ; + + if (len > 0 && psf->broadcast_16k->coding_history [len - 1] != '\n') + psf_strlcat (psf->broadcast_16k->coding_history, sizeof (psf->broadcast_16k->coding_history), "\r\n") ; + + if (psf->file.mode == SFM_WRITE) + { char added_history [256] ; + + gen_coding_history (added_history, sizeof (added_history), &(psf->sf)) ; + psf_strlcat (psf->broadcast_16k->coding_history, sizeof (psf->broadcast_16k->coding_history), added_history) ; + } ; + + /* Force coding_history_size to be even. */ + len = strlen (psf->broadcast_16k->coding_history) ; + len += (len & 1) ? 1 : 2 ; + psf->broadcast_16k->coding_history_size = len ; + + /* Currently writing this version. */ + psf->broadcast_16k->version = 1 ; + + return SF_TRUE ; +} /* broadcast_var_set */ + + +int +broadcast_var_get (SF_PRIVATE *psf, SF_BROADCAST_INFO * data, size_t datasize) +{ size_t size ; + + if (psf->broadcast_16k == NULL) + return SF_FALSE ; + + size = SF_MIN (datasize, bc_min_size ((const SF_BROADCAST_INFO *) psf->broadcast_16k)) ; + + memcpy (data, psf->broadcast_16k, size) ; + + return SF_TRUE ; +} /* broadcast_var_get */ + +/*------------------------------------------------------------------------------ +*/ + +static int +gen_coding_history (char * added_history, int added_history_max, const SF_INFO * psfinfo) +{ char chnstr [16] ; + int count, width ; + + /* + ** From : http://www.sr.se/utveckling/tu/bwf/docs/codhist2.htm + ** + ** Parameter Variable string <allowed option> Unit + ** ========================================================================================== + ** Coding Algorithm A=<ANALOGUE, PCM, MPEG1L1, MPEG1L2, MPEG1L3, + ** MPEG2L1, MPEG2L2, MPEG2L3> + ** Sampling frequency F=<11000,22050,24000,32000,44100,48000> [Hz] + ** Bit-rate B=<any bit-rate allowed in MPEG 2 (ISO/IEC [kbit/s per channel] + ** 13818-3)> + ** Word Length W=<8, 12, 14, 16, 18, 20, 22, 24> [bits] + ** Mode M=<mono, stereo, dual-mono, joint-stereo> + ** Text, free string T=<a free ASCII-text string for in house use. + ** This string should contain no commas (ASCII + ** 2Chex). Examples of the contents: ID-No; codec + ** type; A/D type> + */ + + switch (psfinfo->channels) + { case 0 : + return SF_FALSE ; + + case 1 : + psf_strlcpy (chnstr, sizeof (chnstr), "mono") ; + break ; + + case 2 : + psf_strlcpy (chnstr, sizeof (chnstr), "stereo") ; + break ; + + default : + snprintf (chnstr, sizeof (chnstr), "%uchn", psfinfo->channels) ; + break ; + } ; + + switch (SF_CODEC (psfinfo->format)) + { case SF_FORMAT_PCM_U8 : + case SF_FORMAT_PCM_S8 : + width = 8 ; + break ; + case SF_FORMAT_PCM_16 : + width = 16 ; + break ; + case SF_FORMAT_PCM_24 : + width = 24 ; + break ; + case SF_FORMAT_PCM_32 : + width = 32 ; + break ; + case SF_FORMAT_FLOAT : + width = 24 ; /* Bits in the mantissa + 1 */ + break ; + case SF_FORMAT_DOUBLE : + width = 53 ; /* Bits in the mantissa + 1 */ + break ; + case SF_FORMAT_ULAW : + case SF_FORMAT_ALAW : + width = 12 ; + break ; + default : + width = 42 ; + break ; + } ; + + count = snprintf (added_history, added_history_max, + "A=PCM,F=%u,W=%hu,M=%s,T=%s-%s\r\n", + psfinfo->samplerate, width, chnstr, PACKAGE, VERSION) ; + + if (count >= added_history_max) + return 0 ; + + return count ; +} /* gen_coding_history */ + |