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codec/fr: Add support for encoding/decoding using libgsm 

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2010-11-11 13:51:31 +01:00
parent 24b761218f
commit dc5b38b991
3 changed files with 71 additions and 1 deletions
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11
configure.ac
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@ -20,8 +20,19 @@ AC_CONFIG_FILES([
AC_PROG_CC
# Checks for libraries.
# libosmocore (codec module)
PKG_CHECK_MODULES(LIBOSMOCODEC, libosmocodec >= 0.1.25)
# libgsm for FR decoding
found_libgsm=yes
AC_CHECK_HEADERS(gsm/gsm.h, ,
[AC_CHECK_HEADERS(gsm.h, ,found_libgsm=no)])
AC_CHECK_LIB(gsm, gsm_create, LIBGSM_LIBS="-lgsm", found_libgsm=no)
if test "$found_libgsm" = yes; then
AC_DEFINE(HAVE_LIBGSM, 1, [Define to 1 if libgsm is available])
fi
AC_SUBST(LIBGSM_LIBS)
# Checks for header files.
AC_CHECK_HEADERS([stdint.h stdlib.h string.h unistd.h])

2
src/Makefile.am
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@ -1,6 +1,6 @@
INCLUDES = $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)
AM_CFLAGS=-Wall $(LIBOSMOCODEC_CFLAGS)
AM_LDFLAGS=$(LIBOSMOCODEC_LIBS)
AM_LDFLAGS=$(LIBOSMOCODEC_LIBS) ${LIBGSM_LIBS}
bin_PROGRAMS = gapk
gapk_SOURCES = main.c \

59
src/codec_fr.c
View File

@ -19,9 +19,68 @@
#include <gapk/codecs.h>
#include "config.h"
#ifdef HAVE_LIBGSM
/* Find header */
#ifdef HAVE_GSM_H
# include <gsm.h>
#elif HAVE_GSM_GSM_H
# include <gsm/gsm.h>
#else
# error "Can't find gsm.h header anywhere ..."
#endif
#include <string.h>
static void *
codec_fr_init(void)
{
return (void *)gsm_create();
}
static void
codec_fr_exit(void *state)
{
gsm_destroy( (gsm)state );
}
static int
codec_fr_encode(void *state, uint8_t *cod, const uint8_t *pcm)
{
gsm gh = (gsm)state;
uint8_t pcm_b[2*160]; /* local copy as libgsm src isn't const ! */
memcpy(pcm_b, pcm, 2*160);
gsm_encode(gh, (gsm_signal*)pcm, (gsm_byte*)cod);
return 0;
}
static int
codec_fr_decode(void *state, uint8_t *pcm, const uint8_t *cod)
{
gsm gh = (gsm)state;
uint8_t cod_b[33]; /* local copy as libgsm src isn't const ! */
memcpy(cod_b, cod, 33);
return gsm_decode(gh, (gsm_byte*)cod_b, (gsm_signal*)pcm);
}
#endif /* HAVE_LIBGSM */
const struct codec_desc codec_fr_desc = {
.type = CODEC_FR,
.name = "fr",
.description = "GSM 06.10 Full Rate codec (classic gsm codec)",
.canon_frame_len = 33,
#ifdef HAVE_LIBGSM
.codec_enc_format_type = FMT_GSM,
.codec_dec_format_type = FMT_GSM,
.codec_init = codec_fr_init,
.codec_exit = codec_fr_exit,
.codec_encode = codec_fr_encode,
.codec_decode = codec_fr_decode,
#endif
};