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Diffstat (limited to 'stack/a2dp/a2d_m24.c')
| -rw-r--r-- | stack/a2dp/a2d_m24.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/stack/a2dp/a2d_m24.c b/stack/a2dp/a2d_m24.c new file mode 100644 index 0000000..d8df766 --- /dev/null +++ b/stack/a2dp/a2d_m24.c @@ -0,0 +1,149 @@ +/***************************************************************************** +** +** Name: a2d_m24.c +** +** Description:utility functions to help build and parse MPEG-2, 4 AAC +** Codec Information Element and Media Payload. +** Copyright (c) 2002-2004, WIDCOMM Inc., All Rights Reserved. +** WIDCOMM Bluetooth Core. Proprietary and confidential. +** +*****************************************************************************/ + +#include "bt_target.h" + +#if (A2D_M24_INCLUDED == TRUE) +#include "a2d_api.h" +#include "a2d_int.h" +#include "a2d_m24.h" + + +/****************************************************************************** +** +** Function A2D_BldM24Info +** +** Description This function is called by an application to build +** the MPEG-2, 4 AAC Media Codec Capabilities byte sequence +** beginning from the LOSC octet. +** Input Parameters: +** media_type: Indicates Audio, or Multimedia. +** +** p_ie: MPEG-2, 4 AAC Codec Information Element information. +** +** Output Parameters: +** p_result: the resulting codec info byte sequence. +** +** Returns A2D_SUCCESS if function execution succeeded. +** Error status code, otherwise. +******************************************************************************/ +tA2D_STATUS A2D_BldM24Info(UINT8 media_type, tA2D_M24_CIE *p_ie, UINT8 *p_result) +{ + tA2D_STATUS status; + UINT16 bitrate45; + + if( p_ie == NULL || p_result == NULL || + (p_ie->obj_type & ~A2D_M24_IE_OBJ_MSK) || + (p_ie->samp_freq & ~A2D_M24_IE_SAMP_FREQ_MSK) || + (p_ie->chnl & ~A2D_M24_IE_CHNL_MSK) || + (p_ie->bitrate & ~A2D_M24_IE_BITRATE_MSK)) + { + /* if any unused bit is set */ + status = A2D_INVALID_PARAMS; + } + else + { + status = A2D_SUCCESS; + *p_result++ = A2D_M24_INFO_LEN; + *p_result++ = media_type; + *p_result++ = A2D_MEDIA_CT_M24; + + /* Media Codec Specific Information Element */ + *p_result++ = p_ie->obj_type; + + UINT16_TO_BE_STREAM(p_result, p_ie->samp_freq); + p_result--; + *p_result++ |= p_ie->chnl; + + *p_result = (p_ie->bitrate & A2D_M24_IE_BITRATE3_MSK) >> 16; + if(p_ie->vbr) + *p_result |= A2D_M24_IE_VBR_MSK; + p_result++; + bitrate45 = (UINT16)(p_ie->bitrate & A2D_M24_IE_BITRATE45_MSK); + UINT16_TO_BE_STREAM(p_result, bitrate45); + } + return status; +} + +/****************************************************************************** +** +** Function A2D_ParsM24Info +** +** Description This function is called by an application to parse +** the MPEG-2, 4 AAC Media Codec Capabilities byte sequence +** beginning from the LOSC octet. +** Input Parameters: +** p_info: the byte sequence to parse. +** +** for_caps: TRUE, if the byte sequence is for get capabilities response. +** +** Output Parameters: +** p_ie: MPEG-2, 4 AAC Codec Information Element information. +** +** Returns A2D_SUCCESS if function execution succeeded. +** Error status code, otherwise. +******************************************************************************/ +tA2D_STATUS A2D_ParsM24Info(tA2D_M24_CIE *p_ie, UINT8 *p_info, BOOLEAN for_caps) +{ + tA2D_STATUS status; + UINT8 vbr; + UINT16 u16; + UINT8 losc; + UINT8 mt; + + if( p_ie == NULL || p_info == NULL) + status = A2D_INVALID_PARAMS; + else + { + losc = *p_info++; + mt = *p_info++; + /* If the function is called for the wrong Media Type or Media Codec Type */ + if(losc != A2D_M24_INFO_LEN || *p_info != A2D_MEDIA_CT_M24) + status = A2D_WRONG_CODEC; + else + { + p_info++; + p_ie->obj_type = *p_info++; + BE_STREAM_TO_UINT16(p_ie->samp_freq, p_info); + p_ie->chnl = p_ie->samp_freq & A2D_M24_IE_CHNL_MSK; + p_ie->samp_freq &= A2D_M24_IE_SAMP_FREQ_MSK; + vbr = *p_info++; + BE_STREAM_TO_UINT16(u16, p_info); /* u16 contains the octect4, 5 of bterate */ + + p_ie->vbr = (vbr & A2D_M24_IE_VBR_MSK) >> 7; + vbr &= ~A2D_M24_IE_VBR_MSK; /* vbr has become the octect3 of bitrate */ + p_ie->bitrate = vbr; + p_ie->bitrate <<= 16; + p_ie->bitrate += u16; + + status = A2D_SUCCESS; + if(for_caps == FALSE) + { + if(A2D_BitsSet(p_ie->obj_type) != A2D_SET_ONE_BIT) + status = A2D_BAD_OBJ_TYPE; + + if((A2D_BitsSet((UINT8)(p_ie->samp_freq&0xFF)) + + A2D_BitsSet((UINT8)((p_ie->samp_freq&0xFF00)>>8)))!= A2D_SET_ONE_BIT) + status = A2D_BAD_SAMP_FREQ; + + if(A2D_BitsSet(p_ie->chnl) != A2D_SET_ONE_BIT) + status = A2D_BAD_CHANNEL; + + /* BitRate must be greater than zero when specifying AAC configuration */ + if (p_ie->bitrate == 0) + status = A2D_BAD_BIT_RATE; + } + } + } + return status; +} +#endif /* (A2D_M24_INCLUDED == TRUE) */ + |