BT.656 defined the parallel and serial interfaces for transmitting
4:2:2 YCbCr digital video between equipment in studio
and pro-video applications. Active video resolutions are
either 720 x 486 (525/60 video systems) or 720 x 576
(625/50 video systems).
The BT.656 parallel interface uses 8 or 10 bits of multiplexed
YCbCr data and a 27MHz clock (ECL levels are used for the
data and clock signals). Instead of the conventional video
timing signals (HSYNC, VSYNC, and BLANK) also being
transmitted, BT.656 uses unique timing codes embedded
within the video stream. This reduces the number of wires
(and IC pins) required for a BT.656 video interface.
GSM的AMR语音CODECS.
/*----------------------------------------------------------------------------
; GLOBAL FUNCTION DEFINITIONS
----------------------------------------------------------------------------*/
/*
* This function allocates memory for filter structure and initializes state
* memory used by the GSM AMR decoder. This function returns zero. It will
* return negative one if there is an error.
*/
Word16 GSMInitDecode(void **state_data,
Word8 *id);
/*
* AMRDecode steps into the part of the library that decodes the raw data
* speech bits for the decoding process. It returns the address offset of
* the next frame to be decoded.
*/
Word16 AMRDecode(
void *state_data,
enum Frame_Type_3GPP frame_type,
UWord8 *speech_bits_ptr,
Word16 *raw_pcm_buffer,
Word16 input_format
);
/*
* This function resets the state memory used by the GSM AMR decoder. This
* function returns zero. It will return negative one if there is an error.
*/
Word16 Speech_Decode_Frame_reset(void *state_data);
/*
* This function frees up the memory used for the state memory of the
* GSM AMR decoder.
*/
void GSMDecodeFrameExit(void **state_data);
