X-Git-Url: http://git.eversberg.eu/gitweb.cgi?p=lcr.git;a=blobdiff_plain;f=gsm_audio.c;h=eabf2f591af10d39a776d8e992bfa7d25c291cfd;hp=835ac98f6ba3556bf2b9983b56827ee9cbbfd560;hb=9b2cabced47630e31cfc57c1384af805170b6d2f;hpb=71066559a8a3467d9c74824a369225738305b1ab;ds=inline

diff --git a/gsm_audio.c b/gsm_audio.c
index 835ac98..eabf2f5 100644
--- a/gsm_audio.c
+++ b/gsm_audio.c
@@ -50,5 +50,176 @@ void gsm_fr_encode(void *arg, signed short *samples, unsigned char *frame)
 	gsm_encode((gsm)arg, (gsm_signal *)samples, (gsm_byte *)frame);
 }
 
+#ifdef WITH_GSMAMR
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <opencore-amrnb/interf_dec.h>
+#include <opencore-amrnb/interf_enc.h>
+
+
+struct codec_efr_state {
+	void *encoder;
+	void *decoder;
+};
+
+/* create gsm instance */
+void *gsm_amr_create(void)
+{
+	struct codec_efr_state *st;
+
+	st = (struct codec_efr_state *)calloc(1, sizeof(*st));
+	if (!st)
+		return NULL;
+
+	st->encoder = Encoder_Interface_init(0);
+	st->decoder = Decoder_Interface_init();
+
+	return (void *)st;
+}
+
+/* free gsm instance */
+void gsm_amr_destroy(void *arg)
+{
+	struct codec_efr_state *st = (struct codec_efr_state *)arg;
+
+	Decoder_Interface_exit(st->decoder);
+	Encoder_Interface_exit(st->encoder);
+
+	return;
+}
+
+enum Mode amr_mode[8] = {
+        MR475,    /* 4.75 kbps */
+        MR515,    /* 5.15 kbps */
+	MR59,     /* 5.90 kbps */
+	MR67,     /* 6.70 kbps */
+	MR74,     /* 7.40 kbps */
+	MR795,    /* 7.95 kbps */
+	MR102,    /* 10.2 kbps */
+	MR122,    /* 12.2 kbps */
+};
+
+/* decode frame into samples, return error */
+int gsm_amr_decode(void *arg, unsigned char *frame, signed short *samples)
+{
+	struct codec_efr_state *st = (struct codec_efr_state *)arg;
+
+	Decoder_Interface_Decode(
+		st->decoder,
+		(const unsigned char*) frame + 1,
+		(short *) samples,
+		0
+	);
+
+	return 0;
+}
+
+/* encode samples into frame */
+int gsm_amr_encode(void *arg, signed short *samples, unsigned char *frame, int mode)
+{
+	struct codec_efr_state *st = (struct codec_efr_state *)arg;
+	int rv;
+
+	rv = Encoder_Interface_Encode(
+		st->encoder,
+		amr_mode[mode],
+		(const short*) samples,
+		(unsigned char*) frame + 1,
+		1
+	);
+
+	frame[0] = 0xf0; /* no request */
+
+	return rv;
+}
+
+const unsigned short gsm690_12_2_bitorder[244] = {
+	  0,   1,   2,   3,   4,   5,   6,   7,   8,   9,
+	 10,  11,  12,  13,  14,  23,  15,  16,  17,  18,
+	 19,  20,  21,  22,  24,  25,  26,  27,  28,  38,
+	141,  39, 142,  40, 143,  41, 144,  42, 145,  43,
+	146,  44, 147,  45, 148,  46, 149,  47,  97, 150,
+	200,  48,  98, 151, 201,  49,  99, 152, 202,  86,
+	136, 189, 239,  87, 137, 190, 240,  88, 138, 191,
+	241,  91, 194,  92, 195,  93, 196,  94, 197,  95,
+	198,  29,  30,  31,  32,  33,  34,  35,  50, 100,
+	153, 203,  89, 139, 192, 242,  51, 101, 154, 204,
+	 55, 105, 158, 208,  90, 140, 193, 243,  59, 109,
+	162, 212,  63, 113, 166, 216,  67, 117, 170, 220,
+	 36,  37,  54,  53,  52,  58,  57,  56,  62,  61,
+	 60,  66,  65,  64,  70,  69,  68, 104, 103, 102,
+	108, 107, 106, 112, 111, 110, 116, 115, 114, 120,
+	119, 118, 157, 156, 155, 161, 160, 159, 165, 164,
+	163, 169, 168, 167, 173, 172, 171, 207, 206, 205,
+	211, 210, 209, 215, 214, 213, 219, 218, 217, 223,
+	222, 221,  73,  72,  71,  76,  75,  74,  79,  78,
+	 77,  82,  81,  80,  85,  84,  83, 123, 122, 121,
+	126, 125, 124, 129, 128, 127, 132, 131, 130, 135,
+	134, 133, 176, 175, 174, 179, 178, 177, 182, 181,
+	180, 185, 184, 183, 188, 187, 186, 226, 225, 224,
+	229, 228, 227, 232, 231, 230, 235, 234, 233, 238,
+	237, 236,  96, 199,
+};
+
+/* decode frame into samples, return error */
+int gsm_efr_decode(void *arg, unsigned char *frame, signed short *samples)
+{
+	struct codec_efr_state *st = (struct codec_efr_state *)arg;
+	unsigned char cod[32], bit;
+	int i, si;
+
+	cod[0] = 0x3c; /* good AMR 12,2 frame */
+	memset(cod + 1, 0, 31);
+
+	for (i = 0; i < 244; i++) {
+		si = gsm690_12_2_bitorder[i] + 4;
+		bit = (frame[si >> 3] >> (7 - (si & 7))) & 1;
+		cod[(i >> 3) + 1] |= (bit << (7 - (i & 7)));
+	}
+
+	Decoder_Interface_Decode(
+		st->decoder,
+		(const unsigned char*) cod,
+		(short *) samples,
+		0
+	);
+
+	return 0;
+}
+
+/* encode samples into frame */
+int gsm_efr_encode(void *arg, signed short *samples, unsigned char *frame)
+{
+	struct codec_efr_state *st = (struct codec_efr_state *)arg;
+	int rv;
+	unsigned char cod[32], bit;
+	int i, di;
+
+	rv = Encoder_Interface_Encode(
+		st->encoder,
+		MR122,
+		(const short*) samples,
+		(unsigned char*) cod,
+		1
+	);
+
+	if (cod[0] != 0x3c)
+		return -1;
+
+	frame[0] = 0xc0;
+	memset(frame + 1, 0, 30);
+
+	for (i = 0; i < 244; i++) {
+		di = gsm690_12_2_bitorder[i] + 4;
+		bit = (cod[(i >> 3) + 1] >> (7 - (i & 7))) & 1;
+		frame[di >> 3] |= (bit << (7 - (di & 7)));
+	}
+	return rv;
+}
+
+#endif
+
 } /* extern "C" */