@ Tremolo library
@-----------------------------------------------------------------------
@ Copyright (C) 2002-2009, Xiph.org Foundation
@ Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd
@ All rights reserved.
@ Redistribution and use in source and binary forms, with or without
@ modification, are permitted provided that the following conditions
@ are met:
@ * Redistributions of source code must retain the above copyright
@ notice, this list of conditions and the following disclaimer.
@ * Redistributions in binary form must reproduce the above
@ copyright notice, this list of conditions and the following disclaimer
@ in the documentation and/or other materials provided with the
@ distribution.
@ * Neither the names of the Xiph.org Foundation nor Pinknoise
@ Productions Ltd nor the names of its contributors may be used to
@ endorse or promote products derived from this software without
@ specific prior written permission.
@
@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
@ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
@ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
@ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
@ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
@ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
@ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
@ ----------------------------------------------------------------------
.text
.global decode_packed_entry_number
.global decode_packed_entry_number_REALSTART
.global decode_map
.global vorbis_book_decodevv_add
.global _checksum
.extern oggpack_adv
.extern oggpack_look
.extern oggpack_eop
.extern crc_lookup
decode_packed_entry_number_REALSTART:
dpen_nobits:
MOV r0,r5 @ r0 = b
MOV r1,#1 @ r1 = 1
BL oggpack_adv @ oggpack_adv(b,1) /* Force eop */
duff:
MVN r0,#0 @ return -1
LDMFD r13!,{r4-r8,r10,PC}
dpen_readfailed:
SUBS r4,r4,#1 @ r4 = --read
BEQ dpen_nobits
MOV r0,r5 @ r0 = b
MOV r1,r4 @ r1 = read
ADR r14,dpen_read_return
B oggpack_look
decode_packed_entry_number:
@ r0 = codebook *book
@ r1 = oggpack_buffer *b
STMFD r13!,{r4-r8,r10,r14}
LDMIA r0,{r4,r6,r7} @ r4 = read = book->max_length
@ r6 = book->dec_table
@ r7 = book->dec_method
MOV r5,r1 @ r5 = b
MOV r0,r5 @ r0 = b
MOV r1,r4 @ r1 = read
BL oggpack_look
dpen_read_return:
CMP r0,#0
BLT dpen_readfailed
@ r0 = lok
@ r4 = read
@ r5 = b
@ r6 = dec_table
@ r7 = dec_method
CMP r7, #3
BGT meth4
BEQ meth3
CMP r7, #1
BGT meth2
BEQ meth1
meth0:
RSB r1, r4, #0 @ r1 = i-read = 0-read
MOV r7, #0 @ r7 = chase
m0_loop:
MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit
ADC r2, r6, r7, LSL #1 @ r8 = &t[chase*2+C]
LDRB r7, [r2]
ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read)
@ stall Xscale
CMPLT r7, #0x80
BLT m0_loop
AND r7, r7, #0x7F @ r7 = chase
CMP r1, #0 @ if (i-read >= 0) === (i >= read)
MVNGT r7, #0 @ if (i >= read) value to return = -1
ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1
MOV r0, r5 @ r0 = b
BL oggpack_adv @ oggpack_adv(b, i+1);
MOV r0, r7 @ return chase
LDMFD r13!,{r4-r8,r10,PC}
meth1:
@ r0 = lok
@ r4 = read
@ r5 = b
@ r6 = dec_table
RSB r1, r4, #0 @ r1 = i = -read
MOV r10,#0 @ r10= next = 0
m1_loop:
MOV r7, r10 @ r7 = chase=next
MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit
ADC r8, r6, r7 @ r8 = t+chase+bit
LDRB r10,[r8], -r6 @ r10= next=t[chase+bit] r8=chase+bit
ADDS r1, r1, #1 @ r1 = i++
@ stall Xscale
CMPLT r10,#0x80 @ if (next & 0x80) == 0
BLT m1_loop
ADD r1, r1, r4 @ r1 = i+read
MOV r0, r5 @ r0 = b
BL oggpack_adv @ oggpack_adv(b, i)
CMP r10,#0x80
BLT duff
CMP r8, r7 @ if bit==0 (chase+bit==chase) (sets C)
LDRNEB r14,[r6, r7] @ r14= t[chase]
MOVEQ r14,#128
ADC r12,r8, r6 @ r12= chase+bit+1+t
LDRB r14,[r12,r14,LSR #7] @ r14= t[chase+bit+1+(!bit || t[chase]0x0x80)]
BIC r10,r10,#0x80 @ r3 = next &= ~0x80
@ stall Xscale
ORR r0, r14,r10,LSL #8 @ r7 = chase = (next<<8) | r14
LDMFD r13!,{r4-r8,r10,PC}
meth2:
RSB r1, r4, #0 @ r1 = i-read = 0-read
MOV r7, #0 @ r7 = chase
MOV r6, r6, LSR #1
m2_loop:
MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit
ADC r2, r6, r7, LSL #1 @ r8 = &t[chase*2+C]
LDRH r7, [r2, r2]
ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read)
@ stall Xscale
CMPLT r7, #0x8000
BLT m2_loop
BIC r7, r7, #0x8000 @ r7 = chase
CMP r1, #0 @ if (i-read >= 0) === (i >= read)
MVNGT r7, #0 @ if (i >= read) value to return = -1
ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1
MOV r0, r5 @ r0 = b
BL oggpack_adv @ oggpack_adv(b, i+1);
MOV r0, r7 @ return chase
LDMFD r13!,{r4-r8,r10,PC}
meth3:
@ r0 = lok
@ r4 = read
@ r5 = b
@ r6 = dec_table
RSB r1, r4, #0 @ r1 = i = -read
MOV r10,#0 @ r10= next = 0
m3_loop:
MOV r7, r10 @ r7 = chase=next
MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit
ADC r8, r7, #0 @ r8 = chase+bit
MOV r8, r8, LSL #1 @ r8 = (chase+bit)<<1
LDRH r10,[r6, r8] @ r10= next=t[chase+bit]
ADDS r1, r1, #1 @ r1 = i++
@ stall Xscale
CMPLT r10,#0x8000 @ if (next & 0x8000) == 0
BLT m3_loop
ADD r1, r1, r4 @ r1 = i+read
MOV r0, r5 @ r0 = b
BL oggpack_adv @ oggpack_adv(b, i)
CMP r10,#0x8000
BLT duff
MOV r7, r7, LSL #1
CMP r8, r7 @ if bit==0 (chase+bit==chase) sets C
LDRNEH r14,[r6, r7] @ r14= t[chase]
MOVEQ r14,#0x8000
ADC r12,r8, r14,LSR #15 @ r12= 1+((chase+bit)<<1)+(!bit || t[chase]0x0x8000)
ADC r12,r12,r14,LSR #15 @ r12= t + (1+chase+bit+(!bit || t[chase]0x0x8000))<<1
LDRH r14,[r6, r12] @ r14= t[chase+bit+1
BIC r10,r10,#0x8000 @ r3 = next &= ~0x8000
@ stall Xscale
ORR r0, r14,r10,LSL #16 @ r7 = chase = (next<<16) | r14
LDMFD r13!,{r4-r8,r10,PC}
meth4:
RSB r1, r4, #0 @ r1 = i-read = 0-read
MOV r7, #0 @ r7 = chase
m4_loop:
MOVS r0, r0, LSR #1 @ r0 = lok>>1 C = bottom bit
ADC r2, r7, r7 @ r8 = chase*2+C
LDR r7, [r6, r2, LSL #2]
ADDS r1, r1, #1 @ r1 = i-read++ (i-read<0 => i<read)
@ stall Xscale
CMPLT r7, #0x80000000
BLT m4_loop
BIC r7, r7, #0x80000000 @ r7 = chase
CMP r1, #0 @ if (i-read >= 0) === (i >= read)
MVNGT r7, #0 @ if (i >= read) value to return = -1
ADD r1, r1, r4 @ r1 = i-read+read+1 = i +1
MOV r0, r5 @ r0 = b
BL oggpack_adv @ oggpack_adv(b, i+1);
MOV r0, r7 @ return chase
LDMFD r13!,{r4-r8,r10,PC}
decode_map:
@ r0 = codebook *s
@ r1 = oggpack_buffer *b
@ r2 = int v
@ r3 = int point
STMFD r13!,{r4-r11,r14}
MOV r4, r0 @ r4 = s
MOV r5, r1 @ r5 = b
MOV r6, r2 @ r6 = v
MOV r7, r3 @ r7 = point
BL decode_packed_entry_number
MOV r8, r0
MOV r0, r5
BL oggpack_eop
CMP r0, #0
BNE dm_duff
@ r4 = s
@ r5 = b
@ r6 = v
@ r7 = point
@ r8 = entry
LDR r1, [r4,#12] @ r1 = s->dec_type
LDR r2, [r4,#16] @ r2 = s->q_bits
LDR r3, [r4,#20] @ r3 = s->dim
LDR r5, [r4,#24] @ r5 = s->q_delp
LDR r11,[r4,#28] @ r11= s->q_minp
LDR r12,[r4,#32] @ r12= s->q_del = mul
LDR r14,[r4,#36] @ r14= s->q_min
SUBS r11,r7, r11 @ r11= add = point - s->q_minp
MOVGT r14,r14,ASR r11 @ r14= add = s->q_min >> add (if add >0)
RSBLT r11,r11,#0
MOVLT r14,r14,LSL r11 @ r14= add = s->q_min << -add (if add < 0)
SUBS r5, r7, r5 @ r5 = shiftM = point - s->q_delp
LDR r7, [r4,#40] @ r7 = s->q_seq
RSBLT r5, r5, #0 @ if (shiftM<0) r5 =-shiftM
MOVLT r12,r12,LSL r5 @ r12=mul<<-shiftM
MOVLT r5, #0 @ r5 =shiftM = 0
MOVGT r14,r14,LSL r5 @ add <<= shiftM
CMP r7,#0 @ seqMask = (s->q_seq?-1:0)
MVNNE r7,#0
CMP r1, #2
BEQ dm2
BGT dm3
CMP r1,#0 @ probably never happens
BLE dm_duff
dm1:
@ r1 = s->dec_type
@ r2 = s->q_bits
@ r3 = s->dim
@ r5 = shiftM
@ r6 = v
@ r7 = seqMask
@ r8 = entry
@ r12= mul
@ r14= add
MOV r0, #1
RSB r0, r0, r0, LSL r2 @ r0 = mask = (1<<s->q_bits)-1
MOV r11,#0 @ r11= prev = 0
dm1_loop:
AND r1, r8, r0 @ r1 = v = entry & mask
MLA r1, r12, r1, r14 @ r1 = (add + mul*v)
MOV r8, r8, LSR r2 @ r8 = entry>>s->q_bits
SUBS r3, r3, #1
ADD r1, r11,r1, ASR r5 @ r1 = v = prev+((add+mul*v)>>shiftM)
AND r11,r1, r7 @ r11= prev = seqMask & v
STR r1, [r6], #4 @ *v++ = v
BGT dm1_loop
MOV r0, #0
LDMFD r13!,{r4-r11,PC}
dm2:
@ r1 = s->dec_type
@ r2 = s->q_bits
@ r3 = s->dim
@ r4 = s
@ r5 = shiftM
@ r6 = v
@ r7 = seqMask
@ r8 = entry
@ r12= mul
@ r14= add
LDR r1, [r4,#44] @ r1 = s->q_pack
LDR r4, [r4,#48] @ r4 = s->q_val
MOV r11,#0 @ r11= prev
MOV r0, #1
RSB r0, r0, r0, LSL r1 @ r8 = mask = (1<<s->q_pack)-1
CMP r2,#8
BGT dm2_hword
dm2_loop:
AND r2, r8, r0 @ r2 = entry & mask
LDRB r2, [r4, r2] @ r2 = v = q->val[entry & mask]
MOV r8, r8, LSR r1 @ r8 = entry>>q_pack
MLA r2, r12,r2, r14 @ r2 = (add+mul*v)
SUBS r3, r3, #1
ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM
AND r11,r2, r7 @ r11= prev = seqMask & v
STR r2, [r6], #4 @ *v++ = v
BGT dm2_loop
MOV r0, #0
LDMFD r13!,{r4-r11,PC}
dm2_hword:
AND r2, r8, r0 @ r2 = entry & mask
MOV r2, r2, LSL #1 @ r2 = 2*r2
LDRH r2, [r4, r2] @ r2 = v = q->val[entry & mask]
MOV r8, r8, LSR r1 @ r8 = entry>>q_pack
MLA r2, r12,r2, r14 @ r2 = (add+mul*v)
SUBS r3, r3, #1
ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM
AND r11,r2, r7 @ r11= prev = seqMask & v
STR r2, [r6], #4 @ *v++ = v
BGT dm2_hword
MOV r0, #0
LDMFD r13!,{r4-r11,PC}
dm3:
@ r1 = s->dec_type
@ r2 = s->q_bits
@ r3 = s->dim
@ r4 = s
@ r5 = shiftM
@ r6 = v
@ r7 = seqMask
@ r8 = entry
@ r12= mul
@ r14= add
LDR r1, [r4,#44] @ r1 = s->q_pack
LDR r4, [r4,#52] @ r4 = s->q_val
CMP r2,#8
MOV r11,#0 @ r11= prev
MLA r4,r1,r8,r4 @ r4 = ptr = s->q_val+entry*s->q_pack
BGT dm3_hword
dm3_loop:
LDRB r2, [r4], #1 @ r2 = v = *ptr++
SUBS r3, r3, #1
MLA r2, r12,r2, r14 @ r2 = (add+mul*v)
ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM
AND r11,r2, r7 @ r11= prev = seqMask & v
STR r2, [r6], #4 @ *v++ = v
BGT dm3_loop
MOV r0, #0
LDMFD r13!,{r4-r11,PC}
dm3_hword:
LDRH r2, [r4], #2 @ r2 = *ptr++
SUBS r3, r3, #1
MLA r2, r12,r2, r14 @ r2 = (add+mul*v)
ADD r2, r11,r2, ASR r5 @ r2 = v = prev+(add+mul*v)>>shiftM
AND r11,r2, r7 @ r11= prev = seqMask & v
STR r2, [r6], #4 @ *v++ = v
BGT dm3_hword
MOV r0, #0
LDMFD r13!,{r4-r11,PC}
dm_duff:
MVN r0,#0
LDMFD r13!,{r4-r11,PC}
vorbis_book_decodevv_add:
@ r0 = codebook *book
@ r1 = ogg_int32_t **a
@ r2 = long offset
@ r3 = int ch
@ <> = b
@ <> = n
@ <> = point
STMFD r13!,{r4-r11,R14}
LDR r7, [r0, #13*4] @ r7 = used_entries
MOV r9, r0 @ r9 = book
MOV r10,r1 @ r10= 0xa[chptr] chptr=0
MOV r6, r3 @ r6 = ch
ADD r8, r10,r3, LSL #2 @ r8 = 0xa[ch]
MOV r11,r2 @ r11= offset
CMP r7, #0 @ if (used_entries <= 0)
BLE vbdvva_exit @ exit
LDR r5, [r13,#10*4] @ r5 = n
vbdvva_loop1:
@ r5 = n
@ r6 = ch
@ r8 = 0xa[ch]
@ r9 = book
@ r10= 0xa[chptr]
@ r11= offset
MOV r0, r9 @ r0 = book
LDR r1, [r13,# 9*4] @ r1 = b
LDR r2, [r9, #14*4] @ r2 = v = dec_buf
LDR r3, [r13,#11*4] @ r3 = point
BL decode_map
CMP r0, #0
BNE vbdvva_fail
LDR r0, [r9, # 5*4] @ r0 = book->dim
LDR r1, [r9, #14*4] @ r1 = v = dec_buf
vbdvva_loop2:
LDR r2, [r10],#4 @ r2 = a[chptr++]
LDR r12,[r1], #4 @ r1 = v[j++]
CMP r10,r8 @ if (chptr == ch)
SUBEQ r10,r10,r6, LSL #2 @ chptr = 0
LDR r14,[r2, r11,LSL #2]! @ r2 = 0xa[chptr++][i] r14=[r12]
ADDEQ r11,r11,#1 @ i++
SUBEQ r5, r5, #1 @ n--
SUBS r0, r0, #1 @ r0--
ADD r12,r12,r14 @ r12= a[chptr++][i]+ v[j]
STR r12,[r2] @ r12= a[chptr++][i]+=v[j]
BGT vbdvva_loop2
CMP r5,#0
BGT vbdvva_loop1
vbdvva_exit:
MOV r0, #0 @ return 0
LDMFD r13!,{r4-r11,PC}
vbdvva_fail:
MVN r0, #0 @ return -1
LDMFD r13!,{r4-r11,PC}
_checksum:
@ r0 = ogg_reference *or
@ r1 = bytes
STMFD r13!,{r5-r6,r14}
LDR r5,=crc_lookup
MOV r14,#0 @ r14= crc_reg = 0
MOVS r12,r0
BEQ _cs_end
_cs_loop1:
LDMIA r12,{r0,r2,r3,r12} @ r0 = or->buffer
@ r2 = or->begin
@ r3 = or->length
@ r12= or->next
LDR r0,[r0] @ r0 = or->buffer->data
CMP r1,r3 @ r3 = post = (bytes < or->length ?
MOVLT r3,r1 @ bytes : or->length)
MOVS r6,r3 @ r6 = j = post
BEQ _cs_no_bytes
ADD r0,r0,r2 @ r0 = or->buffer->data + or->begin
_cs_loop2:
LDRB r2, [r0],#1 @ r2 = data[j]
@ stall
@ stall Xscale
EOR r2, r2, r14,LSR #24 @ r2 = (crc_reg>>24)^data[j]
LDR r2, [r5, r2, LSL #2] @ r2 = crc_lkp[(crc_reg>>24)^data[j]]
SUBS r6, r6, #1 @ j--
@ stall Xscale
EOR r14,r2, r14,LSL #8 @ r14= crc_reg = (crc_reg<<8)^r2
BGT _cs_loop2
_cs_no_bytes:
SUBS r1, r1, r3
CMPNE r12,#0
BNE _cs_loop1
_cs_end:
MOV r0,r14
LDMFD r13!,{r5-r6,PC}
@ END