format: Add support for classic .gsm file/frame format
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/Makefile.am b/src/Makefile.am
index c77be9e..4a6689e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,5 +4,5 @@
bin_PROGRAMS = gapk
gapk_SOURCES = main.c \
- formats.c \
+ formats.c fmt_gsm.c \
codecs.c codec_pcm.c codec_hr.c codec_fr.c codec_efr.c
diff --git a/src/fmt_gsm.c b/src/fmt_gsm.c
new file mode 100644
index 0000000..04ca062
--- /dev/null
+++ b/src/fmt_gsm.c
@@ -0,0 +1,59 @@
+/* Classic .gsm files for FR */
+
+/*
+ * This file is part of gapk (GSM Audio Pocket Knife).
+ *
+ * gapk 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * gapk 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 gapk. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gapk/codecs.h>
+#include <gapk/formats.h>
+
+
+#define GSM_MAGIC 0xd
+
+static int
+gsm_from_canon(uint8_t *dst, const uint8_t *src)
+{
+ int i;
+
+ dst[0] = (GSM_MAGIC << 4) | (src[0] >> 4);
+ for (i=1; i<33; i++)
+ dst[i] = (src[i-1] << 4) | (src[i] >> 4);
+
+ return 0;
+}
+
+static int
+gsm_to_canon(uint8_t *dst, const uint8_t *src)
+{
+ int i;
+
+ for (i=0; i<32; i++)
+ dst[i] = (src[i] << 4) | (src[i+1] >> 4);
+ dst[32] = src[32] << 4;
+
+ return 0;
+}
+
+const struct format_desc fmt_gsm = {
+ .type = FMT_GSM,
+ .codec_type = CODEC_FR,
+ .name = "gsm",
+ .description = "Classic .gsm file format",
+
+ .frame_len = 33,
+ .conv_from_canon = gsm_from_canon,
+ .conv_to_canon = gsm_to_canon,
+};
diff --git a/src/formats.c b/src/formats.c
index 1f54c05..5c91a52 100644
--- a/src/formats.c
+++ b/src/formats.c
@@ -22,8 +22,11 @@
#include <gapk/formats.h>
/* Extern format descriptors */
+extern const struct format_desc fmt_gsm;
+
static const struct format_desc *supported_formats[_FMT_MAX] = {
[FMT_INVALID] = NULL,
+ [FMT_GSM] = &fmt_gsm,
};