[PATCH v6 11/17] sbc: Add SBC_MSBC flag to enable 15 block encoding

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This patch defines the SBC_MSBC flag. The purpose of this flag is to encode 15
blocks. It is private to the library and can't be set from standard API.
sbc_init_msbc() function will be defined to set this flag.
---
 sbc/sbc.c |   38 ++++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

diff --git a/sbc/sbc.c b/sbc/sbc.c
index ffdf05d..631072e 100644
--- a/sbc/sbc.c
+++ b/sbc/sbc.c
@@ -52,6 +52,10 @@
 
 #define SBC_SYNCWORD	0x9C
 
+#define SBC_MSBC	0x01
+#define MSBC_SYNCWORD	0xAD
+#define MSBC_BLOCKS	15
+
 /* This structure contains an unpacked SBC frame.
    Yes, there is probably quite some unused space herein */
 struct sbc_frame {
@@ -903,18 +907,22 @@ static ssize_t sbc_pack_frame(uint8_t *data, struct sbc_frame *frame, size_t len
 	}
 }
 
-static void sbc_encoder_init(struct sbc_encoder_state *state,
-					const struct sbc_frame *frame)
+static void sbc_encoder_init(unsigned long flags, unsigned long pflags,
+		struct sbc_encoder_state *state, const struct sbc_frame *frame)
 {
 	memset(&state->X, 0, sizeof(state->X));
 	state->position = (SBC_X_BUFFER_SIZE - frame->subbands * 9) & ~7;
-	state->increment = 4;
+	if (pflags & SBC_MSBC)
+		state->increment = 1;
+	else
+		state->increment = 4;
 
 	sbc_init_primitives(state);
 }
 
 struct sbc_priv {
 	int init;
+	int flags;
 	struct SBC_ALIGNED sbc_frame frame;
 	struct SBC_ALIGNED sbc_decoder_state dec_state;
 	struct SBC_ALIGNED sbc_encoder_state enc_state;
@@ -922,6 +930,7 @@ struct sbc_priv {
 
 static void sbc_set_defaults(sbc_t *sbc, unsigned long flags)
 {
+	sbc->flags = flags;
 	sbc->frequency = SBC_FREQ_44100;
 	sbc->mode = SBC_MODE_STEREO;
 	sbc->subbands = SBC_SB_8;
@@ -1057,12 +1066,16 @@ SBC_EXPORT ssize_t sbc_encode(sbc_t *sbc, const void *input, size_t input_len,
 		priv->frame.subband_mode = sbc->subbands;
 		priv->frame.subbands = sbc->subbands ? 8 : 4;
 		priv->frame.block_mode = sbc->blocks;
-		priv->frame.blocks = 4 + (sbc->blocks * 4);
+		if (priv->flags & SBC_MSBC)
+			priv->frame.blocks = MSBC_BLOCKS;
+		else
+			priv->frame.blocks = 4 + (sbc->blocks * 4);
 		priv->frame.bitpool = sbc->bitpool;
 		priv->frame.codesize = sbc_get_codesize(sbc);
 		priv->frame.length = sbc_get_frame_length(sbc);
 
-		sbc_encoder_init(&priv->enc_state, &priv->frame);
+		sbc_encoder_init(sbc->flags, priv->flags,
+					&priv->enc_state, &priv->frame);
 		priv->init = 1;
 	} else if (priv->frame.bitpool != sbc->bitpool) {
 		priv->frame.length = sbc_get_frame_length(sbc);
@@ -1141,7 +1154,10 @@ SBC_EXPORT size_t sbc_get_frame_length(sbc_t *sbc)
 		return priv->frame.length;
 
 	subbands = sbc->subbands ? 8 : 4;
-	blocks = 4 + (sbc->blocks * 4);
+	if (priv->flags & SBC_MSBC)
+		blocks = MSBC_BLOCKS;
+	else
+		blocks = 4 + (sbc->blocks * 4);
 	channels = sbc->mode == SBC_MODE_MONO ? 1 : 2;
 	joint = sbc->mode == SBC_MODE_JOINT_STEREO ? 1 : 0;
 	bitpool = sbc->bitpool;
@@ -1165,7 +1181,10 @@ SBC_EXPORT unsigned sbc_get_frame_duration(sbc_t *sbc)
 	priv = sbc->priv;
 	if (!priv->init) {
 		subbands = sbc->subbands ? 8 : 4;
-		blocks = 4 + (sbc->blocks * 4);
+		if (priv->flags & SBC_MSBC)
+			blocks = MSBC_BLOCKS;
+		else
+			blocks = 4 + (sbc->blocks * 4);
 	} else {
 		subbands = priv->frame.subbands;
 		blocks = priv->frame.blocks;
@@ -1202,7 +1221,10 @@ SBC_EXPORT size_t sbc_get_codesize(sbc_t *sbc)
 	priv = sbc->priv;
 	if (!priv->init) {
 		subbands = sbc->subbands ? 8 : 4;
-		blocks = 4 + (sbc->blocks * 4);
+		if (priv->flags & SBC_MSBC)
+			blocks = MSBC_BLOCKS;
+		else
+			blocks = 4 + (sbc->blocks * 4);
 		channels = sbc->mode == SBC_MODE_MONO ? 1 : 2;
 	} else {
 		subbands = priv->frame.subbands;
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Bluez Devel]     [Linux Wireless Networking]     [Linux Wireless Personal Area Networking]     [Linux ATH6KL]     [Linux USB Devel]     [Linux Media Drivers]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Big List of Linux Books]

  Powered by Linux