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-rw-r--r--bta/dm/bta_dm_sco.c101
1 files changed, 56 insertions, 45 deletions
diff --git a/bta/dm/bta_dm_sco.c b/bta/dm/bta_dm_sco.c
index 7ad840a..803242b 100644
--- a/bta/dm/bta_dm_sco.c
+++ b/bta/dm/bta_dm_sco.c
@@ -1,30 +1,41 @@
-/*****************************************************************************
-**
-** Name: bta_dm_sco.c
-**
-** Description: This file contains the down sampling utility to convert PCM
-** samples in 16k/32k/48k/44.1k/22050/11025 sampling rate into
-** 8K/16bits samples required for SCO channel format. One API
-** function isprovided and only possible to be used when
-** transmitting SCO data is sent via HCI interface.
-**
-** Original code took from BTW/CE.
-**
-** Copyright (c) 2003-2007, Broadcom Corp., All Rights Reserved.
-** Widcomm Bluetooth Core. Proprietary and confidential.
-**
-*****************************************************************************/
+/******************************************************************************
+ *
+ * Copyright (C) 2003-2012 Broadcom Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************/
+
+/******************************************************************************
+ *
+ * This file contains the down sampling utility to convert PCM samples in
+ * 16k/32k/48k/44.1k/22050/11025 sampling rate into 8K/16bits samples
+ * required for SCO channel format. One API function isprovided and only
+ * possible to be used when transmitting SCO data is sent via HCI
+ * interface.
+ *
+ ******************************************************************************/
#include <string.h>
#include "bta_api.h"
#include "bta_sys.h"
#if (BTM_SCO_HCI_INCLUDED == TRUE)
-#ifndef BTA_DM_SCO_DEBUG
+#ifndef BTA_DM_SCO_DEBUG
#define BTA_DM_SCO_DEBUG FALSE
#endif
/*****************************************************************************
-** Constants
+** Constants
*****************************************************************************/
#define BTA_DM_PCM_OVERLAP_SIZE 48
@@ -37,18 +48,18 @@
** Data types for PCM Resampling utility
*****************************************************************************/
-typedef INT32 (*PCONVERT_TO_BT_FILTERED) (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
+typedef INT32 (*PCONVERT_TO_BT_FILTERED) (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps,INT32 *pLastCurPos, UINT8 *pOverlapArea);
-typedef INT32 (*PCONVERT_TO_BT_NOFILTER) (void *pSrc, void *pDst, UINT32 dwSrcSamples,
+typedef INT32 (*PCONVERT_TO_BT_NOFILTER) (void *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps);
typedef struct
{
UINT8 overlap_area[BTA_DM_PCM_OVERLAP_SIZE * 4];
UINT32 cur_pos; /* current position */
UINT32 src_sps; /* samples per second (source audio data) */
- PCONVERT_TO_BT_FILTERED filter; /* the action function to do the
+ PCONVERT_TO_BT_FILTERED filter; /* the action function to do the
conversion 44100, 22050, 11025*/
- PCONVERT_TO_BT_NOFILTER nofilter; /* the action function to do
+ PCONVERT_TO_BT_NOFILTER nofilter; /* the action function to do
the conversion 48000, 32000, 16000*/
UINT32 bits; /* number of bits per pcm sample */
UINT32 n_channels; /* number of channels (i.e. mono(1), stereo(2)...) */
@@ -228,7 +239,7 @@ tBTA_DM_PCM_RESAMPLE_CB bta_dm_pcm_cb;
/*****************************************************************************
** Local Function
*****************************************************************************/
-INT32 Convert_8M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
+INT32 Convert_8M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
@@ -314,7 +325,7 @@ INT32 Convert_8M_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UIN
#define SRC_CHANNELS 1
#define SRC_SAMPLE(x) pS[x]
-INT32 Convert_16M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
+INT32 Convert_16M_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
@@ -391,7 +402,7 @@ INT32 Convert_16M_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UI
#define SRC_CHANNELS 2
#define SRC_SAMPLE(x) ((((pS[x * 2] - 0x80) << 8) + ((pS[(x * 2) + 1] - 0x80) << 8)) >> 1)
-INT32 Convert_8S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
+INT32 Convert_8S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
@@ -488,14 +499,14 @@ INT32 Convert_8S_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UIN
#define SRC_CHANNELS 2
#define SRC_SAMPLE(x) ((pS[x * 2] + pS[(x * 2) + 1]) >> 1)
-INT32 Convert_16S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
+INT32 Convert_16S_ToBT_Filtered (UINT8 *pSrc, void *pDst, UINT32 dwSrcSamples,
UINT32 dwSrcSps, INT32 *pLastCurPos, UINT8 *pOverlapArea)
{
INT32 CurrentPos = *pLastCurPos;
SRC_TYPE *pIn, *pInEnd;
SRC_TYPE *pOv, *pOvEnd;
INT16 *psBtOut = (INT16 *)pDst;
-
+
memcpy (pOverlapArea + (BTA_DM_PCM_OVERLAP_SIZE * 2), pSrc, BTA_DM_PCM_OVERLAP_SIZE * 2);
pOv = (SRC_TYPE *)(pOverlapArea + BTA_DM_PCM_OVERLAP_SIZE);
@@ -534,7 +545,7 @@ INT32 Convert_16S_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UI
INT16 *psSrc = (INT16 *)pSrc;
INT16 *psDst = (INT16 *)pDst;
INT16 sWorker;
-
+
// start at dwSpsSrc / 2, decrement by 8000
//
CurrentPos = (dwSrcSps >> 1);
@@ -568,11 +579,11 @@ INT32 Convert_16S_ToBT_NoFilter (void *pSrc, void *pDst, UINT32 dwSrcSamples, UI
**
** Description initialize the down sample converter.
**
-** src_sps: original samples per second (source audio data)
+** src_sps: original samples per second (source audio data)
** (ex. 44100, 48000)
** bits: number of bits per pcm sample (16)
** n_channels: number of channels (i.e. mono(1), stereo(2)...)
-**
+**
** Returns none
**
*******************************************************************************/
@@ -584,14 +595,14 @@ void BTA_DmPcmInitSamples (UINT32 src_sps, UINT32 bits, UINT32 n_channels)
p_cb->src_sps = src_sps;
p_cb->bits = bits;
p_cb->n_channels = n_channels;
- p_cb->sample_size = 2;
- p_cb->divisor = 2;
+ p_cb->sample_size = 2;
+ p_cb->divisor = 2;
memset(p_cb->overlap_area, 0, sizeof(p_cb->overlap_area) );
- if ((src_sps == BTA_DM_PCM_SMPL_RATE_44100) ||
- (src_sps == BTA_DM_PCM_SMPL_RATE_22050) ||
- (src_sps == BTA_DM_PCM_SMPL_RATE_11025))
+ if ((src_sps == BTA_DM_PCM_SMPL_RATE_44100) ||
+ (src_sps == BTA_DM_PCM_SMPL_RATE_22050) ||
+ (src_sps == BTA_DM_PCM_SMPL_RATE_11025))
p_cb->can_be_filtered = 1;
else
p_cb->can_be_filtered = 0;
@@ -606,7 +617,7 @@ void BTA_DmPcmInitSamples (UINT32 src_sps, UINT32 bits, UINT32 n_channels)
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_8M_ToBT_Filtered;
p_cb->nofilter = (PCONVERT_TO_BT_NOFILTER) Convert_8M_ToBT_NoFilter;
- p_cb->divisor = 1;
+ p_cb->divisor = 1;
}
else
{
@@ -616,7 +627,7 @@ void BTA_DmPcmInitSamples (UINT32 src_sps, UINT32 bits, UINT32 n_channels)
}
else
{
- /* stereo */
+ /* stereo */
if(bits == 8)
{
p_cb->filter = (PCONVERT_TO_BT_FILTERED) Convert_8S_ToBT_Filtered;
@@ -652,26 +663,26 @@ void BTA_DmPcmInitSamples (UINT32 src_sps, UINT32 bits, UINT32 n_channels)
** in_bytes: Length of the input PCM sample buffer in byte.
** p_dst: pointer to the buffer which is to be used to store
** the converted PCM samples.
-**
+**
**
** Returns INT32: number of samples converted.
-**
+**
**************************************************************************************/
INT32 BTA_DmPcmResample (void *p_src, UINT32 in_bytes, void *p_dst)
{
- UINT32 out_sample;
+ UINT32 out_sample;
#if BTA_DM_SCO_DEBUG
APPL_TRACE_DEBUG1("bta_pcm_resample : insamples %d", (in_bytes / bta_dm_pcm_cb.divisor));
-#endif
+#endif
if(bta_dm_pcm_cb.can_be_filtered)
{
- out_sample = (*bta_dm_pcm_cb.filter) (p_src, p_dst, (in_bytes / bta_dm_pcm_cb.divisor),
+ out_sample = (*bta_dm_pcm_cb.filter) (p_src, p_dst, (in_bytes / bta_dm_pcm_cb.divisor),
bta_dm_pcm_cb.src_sps, (INT32 *) &bta_dm_pcm_cb.cur_pos, bta_dm_pcm_cb.overlap_area);
}
- else
+ else
{
- out_sample = (*bta_dm_pcm_cb.nofilter) (p_src, p_dst,
+ out_sample = (*bta_dm_pcm_cb.nofilter) (p_src, p_dst,
(in_bytes / bta_dm_pcm_cb.divisor), bta_dm_pcm_cb.src_sps);
}
@@ -679,6 +690,6 @@ INT32 BTA_DmPcmResample (void *p_src, UINT32 in_bytes, void *p_dst)
APPL_TRACE_DEBUG1("bta_pcm_resample : outsamples %d", out_sample);
#endif
- return (out_sample * bta_dm_pcm_cb.sample_size);
+ return (out_sample * bta_dm_pcm_cb.sample_size);
}
#endif
generated by cgit v1.1 at 2024-05-12 16:48:45 +0000