c2140b8af1
Changes 'The VP8 project' to 'The WebM project', for consistency with other webmproject.org repositories. Fixes issue #97. Change-Id: I37c13ed5fbdb9d334ceef71c6350e9febed9bbba
321 lines
12 KiB
NASM
321 lines
12 KiB
NASM
;
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; Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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;
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; Use of this source code is governed by a BSD-style license
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; that can be found in the LICENSE file in the root of the source
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; tree. An additional intellectual property rights grant can be found
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; in the file PATENTS. All contributing project authors may
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; be found in the AUTHORS file in the root of the source tree.
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;
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EXPORT |vp8_decode_mb_tokens_v6|
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AREA |.text|, CODE, READONLY ; name this block of code
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INCLUDE vpx_asm_offsets.asm
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l_qcoeff EQU 0
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l_i EQU 4
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l_type EQU 8
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l_stop EQU 12
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l_c EQU 16
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l_l_ptr EQU 20
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l_a_ptr EQU 24
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l_bc EQU 28
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l_coef_ptr EQU 32
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l_stacksize EQU 64
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;; constant offsets -- these should be created at build time
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c_block2above_offset EQU 25
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c_entropy_nodes EQU 11
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c_dct_eob_token EQU 11
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|vp8_decode_mb_tokens_v6| PROC
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stmdb sp!, {r4 - r11, lr}
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sub sp, sp, #l_stacksize
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mov r7, r1 ; type
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mov r9, r0 ; detoken
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ldr r1, [r9, #detok_current_bc]
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ldr r0, [r9, #detok_qcoeff_start_ptr]
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mov r11, #0 ; i
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mov r3, #16 ; stop
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cmp r7, #1 ; type ?= 1
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addeq r11, r11, #24 ; i = 24
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addeq r3, r3, #8 ; stop = 24
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addeq r0, r0, #3, 24 ; qcoefptr += 24*16
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str r0, [sp, #l_qcoeff]
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str r11, [sp, #l_i]
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str r7, [sp, #l_type]
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str r3, [sp, #l_stop]
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str r1, [sp, #l_bc]
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add lr, r9, r7, lsl #2 ; detoken + type*4
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ldr r8, [r1, #bool_decoder_user_buffer]
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ldr r10, [lr, #detok_coef_probs]
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ldr r5, [r1, #bool_decoder_count]
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ldr r6, [r1, #bool_decoder_range]
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ldr r4, [r1, #bool_decoder_value]
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str r10, [sp, #l_coef_ptr]
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BLOCK_LOOP
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ldr r3, [r9, #detok_ptr_block2leftabove]
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ldr r1, [r9, #detok_L]
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ldr r2, [r9, #detok_A]
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ldrb r12, [r3, r11]! ; block2left[i]
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ldrb r3, [r3, #c_block2above_offset]; block2above[i]
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cmp r7, #0 ; c = !type
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moveq r7, #1
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movne r7, #0
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ldrb r0, [r1, r12]! ; *(L += block2left[i])
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ldrb r3, [r2, r3]! ; *(A += block2above[i])
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mov lr, #c_entropy_nodes ; ENTROPY_NODES = 11
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; VP8_COMBINEENTROPYCONTETEXTS(t, *a, *l) => t = ((*a) != 0) + ((*l) !=0)
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cmp r0, #0 ; *l ?= 0
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movne r0, #1
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cmp r3, #0 ; *a ?= 0
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addne r0, r0, #1 ; t
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str r1, [sp, #l_l_ptr] ; save &l
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str r2, [sp, #l_a_ptr] ; save &a
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smlabb r0, r0, lr, r10 ; Prob = coef_probs + (t * ENTROPY_NODES)
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mov r1, #0 ; t = 0
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str r7, [sp, #l_c]
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;align 4
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COEFF_LOOP
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ldr r3, [r9, #detok_ptr_coef_bands_x]
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ldr lr, [r9, #detok_coef_tree_ptr]
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;STALL
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ldrb r3, [r3, r7] ; coef_bands_x[c]
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;STALL
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;STALL
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add r0, r0, r3 ; Prob += coef_bands_x[c]
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get_token_loop
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ldrb r2, [r0, +r1, asr #1] ; Prob[t >> 1]
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mov r3, r6, lsl #8 ; range << 8
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sub r3, r3, #256 ; (range << 8) - (1 << 8)
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mov r10, #1 ; 1
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smlawb r2, r3, r2, r10 ; split = 1 + (((range-1) * probability) >> 8)
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ldrb r12, [r8] ; load cx data byte in stall slot : r8 = bufptr
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;++
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subs r3, r4, r2, lsl #24 ; value-(split<<24): used later to calculate shift for NORMALIZE
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addhs r1, r1, #1 ; t += 1
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movhs r4, r3 ; value -= bigsplit (split << 24)
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subhs r2, r6, r2 ; range -= split
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; movlo r6, r2 ; range = split
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ldrsb r1, [lr, r1] ; t = onyx_coef_tree_ptr[t]
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; NORMALIZE
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clz r3, r2 ; vp8dx_bitreader_norm[range] + 24
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sub r3, r3, #24 ; vp8dx_bitreader_norm[range]
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subs r5, r5, r3 ; count -= shift
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mov r6, r2, lsl r3 ; range <<= shift
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mov r4, r4, lsl r3 ; value <<= shift
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; if count <= 0, += BR_COUNT; value |= *bufptr++ << (BR_COUNT-count); BR_COUNT = 8, but need to upshift values by +16
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addle r5, r5, #8 ; count += 8
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rsble r3, r5, #24 ; 24 - count
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addle r8, r8, #1 ; bufptr++
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orrle r4, r4, r12, lsl r3 ; value |= *bufptr << shift + 16
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cmp r1, #0 ; t ?= 0
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bgt get_token_loop ; while (t > 0)
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cmn r1, #c_dct_eob_token ; if(t == -DCT_EOB_TOKEN)
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beq END_OF_BLOCK ; break
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rsb lr, r1, #0 ; v = -t;
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cmp lr, #4 ; if(v > FOUR_TOKEN)
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ble SKIP_EXTRABITS
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ldr r3, [r9, #detok_teb_base_ptr]
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mov r11, #1 ; 1 in split = 1 + ... nope, v+= 1 << bits_count
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add r7, r3, lr, lsl #4 ; detok_teb_base_ptr + (v << 4)
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ldrsh lr, [r7, #tokenextrabits_min_val] ; v = teb_ptr->min_val
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ldrsh r0, [r7, #tokenextrabits_length] ; bits_count = teb_ptr->Length
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extrabits_loop
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add r3, r0, r7 ; &teb_ptr->Probs[bits_count]
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ldrb r2, [r3, #4] ; probability. why +4?
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mov r3, r6, lsl #8 ; range << 8
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sub r3, r3, #256 ; range << 8 + 1 << 8
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smlawb r2, r3, r2, r11 ; split = 1 + (((range-1) * probability) >> 8)
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ldrb r12, [r8] ; *bufptr
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;++
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subs r10, r4, r2, lsl #24 ; value - (split<<24)
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movhs r4, r10 ; value = value - (split << 24)
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subhs r2, r6, r2 ; range = range - split
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addhs lr, lr, r11, lsl r0 ; v += ((UINT16)1<<bits_count)
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; NORMALIZE
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clz r3, r2 ; shift - leading zeros in split
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sub r3, r3, #24 ; don't count first 3 bytes
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subs r5, r5, r3 ; count -= shift
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mov r6, r2, lsl r3 ; range = range << shift
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mov r4, r4, lsl r3 ; value <<= shift
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addle r5, r5, #8 ; count += BR_COUNT
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addle r8, r8, #1 ; bufptr++
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rsble r3, r5, #24 ; BR_COUNT - count
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orrle r4, r4, r12, lsl r3 ; value |= *bufptr << (BR_COUNT - count)
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subs r0, r0, #1 ; bits_count --
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bpl extrabits_loop
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SKIP_EXTRABITS
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ldr r11, [sp, #l_qcoeff]
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ldr r0, [sp, #l_coef_ptr] ; Prob = coef_probs
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cmp r1, #0 ; check for nonzero token - if (t)
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beq SKIP_EOB_CHECK ; if t is zero, we will skip the eob table chec
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add r3, r6, #1 ; range + 1
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mov r2, r3, lsr #1 ; split = (range + 1) >> 1
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subs r3, r4, r2, lsl #24 ; value - (split<<24)
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movhs r4, r3 ; value -= (split << 24)
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subhs r2, r6, r2 ; range -= split
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mvnhs r3, lr ; -v
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addhs lr, r3, #1 ; v = (v ^ -1) + 1
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; NORMALIZE
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clz r3, r2 ; leading 0s in split
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sub r3, r3, #24 ; shift
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subs r5, r5, r3 ; count -= shift
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mov r6, r2, lsl r3 ; range <<= shift
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mov r4, r4, lsl r3 ; value <<= shift
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ldrleb r2, [r8], #1 ; *(bufptr++)
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addle r5, r5, #8 ; count += 8
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rsble r3, r5, #24 ; BR_COUNT - count
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orrle r4, r4, r2, lsl r3 ; value |= *bufptr << (BR_COUNT - count)
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add r0, r0, #11 ; Prob += ENTROPY_NODES (11)
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cmn r1, #1 ; t < -ONE_TOKEN
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addlt r0, r0, #11 ; Prob += ENTROPY_NODES (11)
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mvn r1, #1 ; t = -1 ???? C is -2
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SKIP_EOB_CHECK
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ldr r7, [sp, #l_c] ; c
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ldr r3, [r9, #detok_scan]
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add r1, r1, #2 ; t+= 2
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cmp r7, #15 ; c should will be one higher
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ldr r3, [r3, +r7, lsl #2] ; scan[c] this needs pre-inc c value
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add r7, r7, #1 ; c++
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add r3, r11, r3, lsl #1 ; qcoeff + scan[c]
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str r7, [sp, #l_c] ; store c
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strh lr, [r3] ; qcoef_ptr[scan[c]] = v
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blt COEFF_LOOP
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sub r7, r7, #1 ; if(t != -DCT_EOB_TOKEN) --c
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END_OF_BLOCK
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ldr r3, [sp, #l_type] ; type
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ldr r10, [sp, #l_coef_ptr] ; coef_ptr
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ldr r0, [sp, #l_qcoeff] ; qcoeff
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ldr r11, [sp, #l_i] ; i
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ldr r12, [sp, #l_stop] ; stop
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cmp r3, #0 ; type ?= 0
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moveq r1, #1
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movne r1, #0
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add r3, r11, r9 ; detok + i
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cmp r7, r1 ; c ?= !type
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strb r7, [r3, #detok_eob] ; eob[i] = c
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ldr r7, [sp, #l_l_ptr] ; l
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ldr r2, [sp, #l_a_ptr] ; a
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movne r3, #1 ; t
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moveq r3, #0
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add r0, r0, #32 ; qcoeff += 32 (16 * 2?)
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add r11, r11, #1 ; i++
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strb r3, [r7] ; *l = t
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strb r3, [r2] ; *a = t
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str r0, [sp, #l_qcoeff] ; qcoeff
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str r11, [sp, #l_i] ; i
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cmp r11, r12 ; i < stop
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ldr r7, [sp, #l_type] ; type
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blt BLOCK_LOOP
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cmp r11, #25 ; i ?= 25
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bne ln2_decode_mb_to
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ldr r12, [r9, #detok_qcoeff_start_ptr]
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ldr r10, [r9, #detok_coef_probs]
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mov r7, #0 ; type/i = 0
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mov r3, #16 ; stop = 16
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str r12, [sp, #l_qcoeff] ; qcoeff_ptr = qcoeff_start_ptr
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str r7, [sp, #l_i]
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str r7, [sp, #l_type]
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str r3, [sp, #l_stop]
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str r10, [sp, #l_coef_ptr] ; coef_probs = coef_probs[type=0]
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b BLOCK_LOOP
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ln2_decode_mb_to
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cmp r11, #16 ; i ?= 16
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bne ln1_decode_mb_to
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mov r10, #detok_coef_probs
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add r10, r10, #2*4 ; coef_probs[type]
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ldr r10, [r9, r10] ; detok + detok_coef_probs[type]
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mov r7, #2 ; type = 2
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mov r3, #24 ; stop = 24
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str r7, [sp, #l_type]
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str r3, [sp, #l_stop]
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str r10, [sp, #l_coef_ptr] ; coef_probs = coef_probs[type]
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b BLOCK_LOOP
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ln1_decode_mb_to
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ldr r2, [sp, #l_bc]
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mov r0, #0
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nop
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str r8, [r2, #bool_decoder_user_buffer]
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str r5, [r2, #bool_decoder_count]
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str r4, [r2, #bool_decoder_value]
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str r6, [r2, #bool_decoder_range]
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add sp, sp, #l_stacksize
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ldmia sp!, {r4 - r11, pc}
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ENDP ; |vp8_decode_mb_tokens_v6|
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END
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