mpa_error.s

samsung 9908DVD源代码,

/*
 *  mpa_error.s
 *
 *  MPEG/audio multichannel decoder.
 *	Copyright (C) 2003 Optical Player P/J, Samsung Electronics.
 */

.include 	"mpa.h"

.secFILE_mpa_error

/********************************************************************

 Function:		mpa_error_process
  
 Description:	
 				  
********************************************************************/
mpa_error_process::
				push		a14
				ld			a8, #SFR_BASE

_ERR_CODE_01	cmp			eq, r2, #_MPG_SYNC_NOT_FOUND
				brf			_ERR_CODE_02
				
				/* error porcess */
				
				bra			end_error_process

_ERR_CODE_02	cmp			eq, r2, #_EXT_SYNC_NOT_FOUND
				brf			_ERR_CODE_03
				
				bra			end_error_process

_ERR_CODE_03	cmp			eq, r2, #_BASE_CRC_ERROR
				brf			_ERR_CODE_04
				
				bra			end_error_process

_ERR_CODE_04	cmp			eq, r2, #_MC_CRC_ERROR
				brf			_ERR_CODE_05				
				
				bra			end_error_process

_ERR_CODE_05	cmp			eq, r2, #_AUG_CRC_ERROR
				brf			_ERR_CODE_06				
				
				bra			end_error_process

_ERR_CODE_06	cmp			eq, r2, #_EXT_CRC_ERROR
				brf			_ERR_CODE_07				
				
				bra			end_error_process

_ERR_CODE_07	cmp			eq, r2, #_CRC_RECOVERED
				brf			_ERR_CODE_08				
				
				bra			end_error_process

_ERR_CODE_08	cmp			eq, r2, #_ILLEGAL_LAYER
				brf			_ERR_CODE_09				
				
				bra			end_error_process

_ERR_CODE_09	cmp			eq, r2, #_ILLEGAL_MTX_MODE
				brf			_ERR_CODE_10				
				
				bra			end_error_process

_ERR_CODE_10	cmp			eq, r2, #_ILLEGAL_AUG_MTX_MODE
				brf			_ERR_CODE_11				
				
				bra			end_error_process

_ERR_CODE_11	cmp			eq, r2, #_ILLEGAL_DOWNMIX_MODE
				brf			_ERR_CODE_12				
				
				bra			end_error_process
				
_ERR_CODE_12	cmp			eq, r2, #_ILLEGAL_MC_PRED_MODE
				brf			_ERR_CODE_13
				eld			a, #_MPEG_1_AUDIO
				eld			rpd1.mpeg_version, a				
				eld			b, #_MPEG1_STEREO
				eld			rpd1.channel_config, b
				bra			end_error_process

_ERR_CODE_13	cmp			eq, r2, #_NO_MAIN_AUDIO_DATA
				brf			_ERR_CODE_14

				bra			end_error_process

_ERR_CODE_14	cmp			eq, r2, #_NO_EXT_AUDIO_DATA
				brf			_ERR_CODE_15				
				
				bra			end_error_process

_ERR_CODE_15	cmp			eq, r2, #_END_OF_BITSTREAM
				brf			_ERR_CODE_16
				
				bra			end_error_process

_ERR_CODE_16	cmp			eq, r2, #_NO_DRC_INFO_IN_STREAM
				brf			_ERR_CODE_17
				ld			r0, #FALSE
				ldw			a9, @[a10+_pParameter]
				ldb			@[a9+_DRC_Mode], r0
				
				bra			skip_mute_frame

_ERR_CODE_17	cmp			eq, r2, #_INVALID_DRC_GAIN
				brf			_ERR_CODE_99

				bra			skip_mute_frame

_ERR_CODE_18	cmp			eq, r2, #_STREAM_IS_BROKEN
				brf			_ERR_CODE_99

				bra			end_error_process

_ERR_CODE_99
				/* unknown error type */
				nop
				nop
				nop
				
end_error_process
				jsr			mute_current_frame
skip_mute_frame
				ldb			@[a10+_DecodeErrFlag], r2
				pop			a14
				ret
				


/********************************************************************

 Function:		mute_current_frame
  
 Description:	Clear current output buffer
 				  
********************************************************************/
mute_current_frame::
; configuration of SBF1 write mode
				ldw			r1, @[a8+rCONFIG0]
				and			r1, #0xf0ff
				ldb			r0, @[a10+_OutPCMSize]
				cmp			eq, r0, #PCM_SAMPLE_24BITS
				brt			_set_s1offset
				or			r1, #0x0600
_set_s1offset	ldw			a9, @[a10+_OutputBufferOffset]
				ldw			@[a8+rCONFIG0], r1
				ldw			@[a8+rSBL1OFF], a9
				eld			rp0, #SBF1_PTR
				esd0		d0, #0
				eld			a, #0
.if( OUPUT_2CH == TRUE )
				ld			r6, #SAMPLES_PER_FRAME*NCH-1
.endif
.if( OUPUT_6CH == TRUE )
				ld			r6, #SAMPLES_PER_FRAME*(NCH+NMCH+1)-1
.endif
.if( OUPUT_8CH == TRUE )
				ld			r6, #SAMPLES_PER_FRAME*(NCH+NMCH+DMCH+1)-1
.endif
				bnzd		r6, $
				eld			@rp0+d0, a
				ret


/* for debuging */
.ifdef _DEBUG_	/* ASM predefined symbol */

.extern |IMAGE$$STACK$$BASE|

print_fraction::
				push		a14, a10
				push		a9, a8
				push		r2
				jsr			__flush_data
				
				ld			a10, #|IMAGE$$STACK$$BASE|+0x1000
				eld			rp1, #fraction
				esd1		s0, #1
				ld			r6, #GRANULES*MAX_CHANNEL*PARTS*SBLIMIT-1	; fraction[12][7][3][32]
D_1				eld			a, @rp1+s0
				ecld		r0, a
				ecld		r1, ah
				ldw			@[a10+0], r1
				ldw			@[a10+2], r0
				bnzd		r6, D_1
				add			a10, #4

				ld			a8, #SFR_BASE
				ld			a9, #0
				ld			a10, #|IMAGE$$STACK$$BASE|+0x1000

.ifdef _DEBUG_
				jsr			_print_fraction
.endif
				pop			r2
				pop			a8, a9
				pop			a10, a14
				ret
.endif


.end