codec: First code import

Lots of fixups still needed before merge into master

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/src/codec/codec.c b/src/codec/codec.c
new file mode 100644
index 0000000..c422b5b
--- /dev/null
+++ b/src/codec/codec.c
@@ -0,0 +1,103 @@
+/* GMR-1 AMBE vocoder */
+
+/* (C) 2013 by Sylvain Munaut <tnt@246tNt.com>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*! \addtogroup codec
+ *  @{
+ */
+
+/*! \file codec/codec.c
+ *  \brief Osmocom GMR-1 AMBE vocoder public API implementation
+ */
+
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <osmocom/gmr1/codec/codec.h>
+
+#include "private.h"
+
+
+/*! \brief Structure for GMR1 codec state */
+struct gmr1_codec
+{
+	struct ambe_decoder dec;	/*< \brief decoder state */
+};
+
+
+/*! \brief Allocates and inits a codec object
+ *  \returns A newly allocated codec, to be freed with \ref gmr1_codec_release
+ */
+struct gmr1_codec *
+gmr1_codec_alloc(void)
+{
+	struct gmr1_codec *codec;
+
+	codec = calloc(1, sizeof(struct gmr1_codec));
+	if (!codec)
+		return NULL;
+
+	ambe_decode_init(&codec->dec);
+
+	return codec;
+}
+
+/*! \brief Release a codec object created by \ref gmr1_codec_alloc
+ *  \param[in] codec The codec object to release
+ */
+void
+gmr1_codec_release(struct gmr1_codec *codec)
+{
+	if (!codec)
+		return;
+
+	ambe_decode_fini(&codec->dec);
+
+	free(codec);
+}
+
+/*! \brief Decodes an AMBE frame to audio
+ *  \param[in] codec Codec object
+ *  \param[out] audio Output audio buffer
+ *  \param[in] N number of audio samples to produce (152..168)
+ *  \param[in] frame Frame data (10 bytes = 80 bits)
+ *  \param[in] bad Bad Frame Indicator. Set to 1 if frame is corrupt
+ *  \returns 0 for success. Negative error code otherwise.
+ */
+int
+gmr1_codec_decode_frame(struct gmr1_codec *codec,
+                        int16_t *audio, int N,
+                        const uint8_t *frame, int bad)
+{
+	return ambe_decode_frame(&codec->dec, audio, N, frame, bad);
+}
+
+/*! \brief Generates audio for DTX period
+ *  \param[in] codec Codec object
+ *  \param[out] audio Output audio buffer
+ *  \param[in] N number of audio samples to produce (152..168)
+ */
+int
+gmr1_codec_decode_dtx(struct gmr1_codec *codec,
+                      int16_t *audio, int N)
+{
+	return ambe_decode_dtx(&codec->dec, audio, N);
+}
+
+/*! @} */