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vpx/vp8/decoder/decodframe.c
Timothy B. Terriberry c17b62e1bd Change bitreader to use a larger window. 
Change bitreading functions to use a larger window which is refilled less
 often.

This makes it cheap enough to do bounds checking each time the window is
 refilled, which avoids the need to copy the input into a large circular
 buffer.
This uses less memory and speeds up the total decode time by 1.6% on an ARM11,
 2.8% on a Cortex A8, and 2.2% on x86-32, but less than 1% on x86-64.

Inlining vp8dx_bool_decoder_fill() has a big penalty on x86-32, as does moving
 the refill loop to the front of vp8dx_decode_bool().
However, having the refill loop between computation of the split values and
 the branch in vp8_decode_mb_tokens() is a big win on ARM (presumably due to
 memory latency and code size: refilling after normalization duplicates the
 code in the DECODE_AND_BRANCH_IF_ZERO and DECODE_AND_LOOP_IF_ZERO cases.
Unfortunately, refilling at the end of vp8dx_bool_decoder_fill() and at the
 beginning of each decode step in vp8_decode_mb_tokens() means the latter
 requires an extra refill at the end.
Platform-specific versions could avoid the problem, but would require most of
 detokenize.c to be duplicated.

Change-Id: I16c782a63376f2a15b78f8086d899b987204c1c7
2010-06-15 19:55:14 -07:00

986 lines
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/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "onyxd_int.h"
#include "header.h"
#include "reconintra.h"
#include "reconintra4x4.h"
#include "recon.h"
#include "reconinter.h"
#include "dequantize.h"
#include "detokenize.h"
#include "invtrans.h"
#include "alloccommon.h"
#include "entropymode.h"
#include "quant_common.h"
#include "segmentation_common.h"
#include "setupintrarecon.h"
#include "demode.h"
#include "decodemv.h"
#include "extend.h"
#include "vpx_mem/vpx_mem.h"
#include "idct.h"
#include "dequantize.h"
#include "predictdc.h"
#include "threading.h"
#include "decoderthreading.h"
#include "dboolhuff.h"
#include <assert.h>
#include <stdio.h>
void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
{
int r, c;
int i;
int Q;
VP8_COMMON *const pc = & pbi->common;
for (Q = 0; Q < QINDEX_RANGE; Q++)
{
pc->Y1dequant[Q][0][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
pc->Y2dequant[Q][0][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
pc->UVdequant[Q][0][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
// all the ac values = ;
for (i = 1; i < 16; i++)
{
int rc = vp8_default_zig_zag1d[i];
r = (rc >> 2);
c = (rc & 3);
pc->Y1dequant[Q][r][c] = (short)vp8_ac_yquant(Q);
pc->Y2dequant[Q][r][c] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
pc->UVdequant[Q][r][c] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
}
}
}
static void mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
int i;
int QIndex;
MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
VP8_COMMON *const pc = & pbi->common;
// Decide whether to use the default or alternate baseline Q value.
if (xd->segmentation_enabled)
{
// Abs Value
if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
// Delta Value
else
{
QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0; // Clamp to valid range
}
}
else
QIndex = pc->base_qindex;
// Set up the block level dequant pointers
for (i = 0; i < 16; i++)
{
xd->block[i].dequant = pc->Y1dequant[QIndex];
}
for (i = 16; i < 24; i++)
{
xd->block[i].dequant = pc->UVdequant[QIndex];
}
xd->block[24].dequant = pc->Y2dequant[QIndex];
}
#if CONFIG_RUNTIME_CPU_DETECT
#define RTCD_VTABLE(x) (&(pbi)->common.rtcd.x)
#else
#define RTCD_VTABLE(x) NULL
#endif
//skip_recon_mb() is Modified: Instead of writing the result to predictor buffer and then copying it
// to dst buffer, we can write the result directly to dst buffer. This eliminates unnecessary copy.
static void skip_recon_mb(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
if (xd->frame_type == KEY_FRAME || xd->mbmi.ref_frame == INTRA_FRAME)
{
vp8_build_intra_predictors_mbuv_s(xd);
vp8_build_intra_predictors_mby_s_ptr(xd);
}
else
{
vp8_build_inter_predictors_mb_s(xd);
}
}
static void clamp_mv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
{
/* If the MV points so far into the UMV border that no visible pixels
* are used for reconstruction, the subpel part of the MV can be
* discarded and the MV limited to 16 pixels with equivalent results.
*
* This limit kicks in at 19 pixels for the top and left edges, for
* the 16 pixels plus 3 taps right of the central pixel when subpel
* filtering. The bottom and right edges use 16 pixels plus 2 pixels
* left of the central pixel when filtering.
*/
if (mv->col < (xd->mb_to_left_edge - (19 << 3)))
mv->col = xd->mb_to_left_edge - (16 << 3);
else if (mv->col > xd->mb_to_right_edge + (18 << 3))
mv->col = xd->mb_to_right_edge + (16 << 3);
if (mv->row < (xd->mb_to_top_edge - (19 << 3)))
mv->row = xd->mb_to_top_edge - (16 << 3);
else if (mv->row > xd->mb_to_bottom_edge + (18 << 3))
mv->row = xd->mb_to_bottom_edge + (16 << 3);
}
/* A version of the above function for chroma block MVs.*/
static void clamp_uvmv_to_umv_border(MV *mv, const MACROBLOCKD *xd)
{
if (2*mv->col < (xd->mb_to_left_edge - (19 << 3)))
mv->col = (xd->mb_to_left_edge - (16 << 3)) >> 1;
else if (2*mv->col > xd->mb_to_right_edge + (18 << 3))
mv->col = (xd->mb_to_right_edge + (16 << 3)) >> 1;
if (2*mv->row < (xd->mb_to_top_edge - (19 << 3)))
mv->row = (xd->mb_to_top_edge - (16 << 3)) >> 1;
else if (2*mv->row > xd->mb_to_bottom_edge + (18 << 3))
mv->row = (xd->mb_to_bottom_edge + (16 << 3)) >> 1;
}
static void clamp_mvs(MACROBLOCKD *xd)
{
if (xd->mbmi.mode == SPLITMV)
{
int i;
for (i=0; i<16; i++)
clamp_mv_to_umv_border(&xd->block[i].bmi.mv.as_mv, xd);
for (i=16; i<24; i++)
clamp_uvmv_to_umv_border(&xd->block[i].bmi.mv.as_mv, xd);
}
else
{
clamp_mv_to_umv_border(&xd->mbmi.mv.as_mv, xd);
clamp_uvmv_to_umv_border(&xd->block[16].bmi.mv.as_mv, xd);
}
}
static void reconstruct_mb(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
if (xd->frame_type == KEY_FRAME || xd->mbmi.ref_frame == INTRA_FRAME)
{
vp8_build_intra_predictors_mbuv(xd);
if (xd->mbmi.mode != B_PRED)
{
vp8_build_intra_predictors_mby_ptr(xd);
vp8_recon16x16mb(RTCD_VTABLE(recon), xd);
}
else
{
vp8_recon_intra4x4mb(RTCD_VTABLE(recon), xd);
}
}
else
{
vp8_build_inter_predictors_mb(xd);
vp8_recon16x16mb(RTCD_VTABLE(recon), xd);
}
}
static void de_quantand_idct(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
int i;
BLOCKD *b = &xd->block[24];
if (xd->mbmi.mode != B_PRED && xd->mbmi.mode != SPLITMV)
{
DEQUANT_INVOKE(&pbi->dequant, block)(b);
// do 2nd order transform on the dc block
if (b->eob > 1)
{
IDCT_INVOKE(RTCD_VTABLE(idct), iwalsh16)(&b->dqcoeff[0], b->diff);
((int *)b->qcoeff)[0] = 0;
((int *)b->qcoeff)[1] = 0;
((int *)b->qcoeff)[2] = 0;
((int *)b->qcoeff)[3] = 0;
((int *)b->qcoeff)[4] = 0;
((int *)b->qcoeff)[5] = 0;
((int *)b->qcoeff)[6] = 0;
((int *)b->qcoeff)[7] = 0;
}
else
{
IDCT_INVOKE(RTCD_VTABLE(idct), iwalsh1)(&b->dqcoeff[0], b->diff);
((int *)b->qcoeff)[0] = 0;
}
for (i = 0; i < 16; i++)
{
b = &xd->block[i];
if (b->eob > 1)
{
DEQUANT_INVOKE(&pbi->dequant, idct_dc)(b->qcoeff, &b->dequant[0][0], b->diff, 32, xd->block[24].diff[i]);
}
else
{
IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(xd->block[24].diff[i], b->diff, 32);
}
}
for (i = 16; i < 24; i++)
{
b = &xd->block[i];
if (b->eob > 1)
{
DEQUANT_INVOKE(&pbi->dequant, idct)(b->qcoeff, &b->dequant[0][0], b->diff, 16);
}
else
{
IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(b->qcoeff[0] * b->dequant[0][0], b->diff, 16);
((int *)b->qcoeff)[0] = 0;
}
}
}
else
{
for (i = 0; i < 24; i++)
{
b = &xd->block[i];
if (b->eob > 1)
{
DEQUANT_INVOKE(&pbi->dequant, idct)(b->qcoeff, &b->dequant[0][0], b->diff, (32 - (i & 16)));
}
else
{
IDCT_INVOKE(RTCD_VTABLE(idct), idct1_scalar)(b->qcoeff[0] * b->dequant[0][0], b->diff, (32 - (i & 16)));
((int *)b->qcoeff)[0] = 0;
}
}
}
}
void vp8_decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd)
{
int eobtotal = 0;
MV orig_mvs[24];
int i, do_clamp = xd->mbmi.need_to_clamp_mvs;
if (xd->mbmi.mb_skip_coeff)
{
vp8_reset_mb_tokens_context(xd);
}
else
{
eobtotal = vp8_decode_mb_tokens(pbi, xd);
}
/* Perform temporary clamping of the MV to be used for prediction */
if (do_clamp)
{
if (xd->mbmi.mode == SPLITMV)
for (i=0; i<24; i++)
orig_mvs[i] = xd->block[i].bmi.mv.as_mv;
else
{
orig_mvs[0] = xd->mbmi.mv.as_mv;
orig_mvs[1] = xd->block[16].bmi.mv.as_mv;
}
clamp_mvs(xd);
}
xd->mode_info_context->mbmi.dc_diff = 1;
if (xd->mbmi.mode != B_PRED && xd->mbmi.mode != SPLITMV && eobtotal == 0)
{
xd->mode_info_context->mbmi.dc_diff = 0;
skip_recon_mb(pbi, xd);
}
else
{
if (xd->segmentation_enabled)
mb_init_dequantizer(pbi, xd);
de_quantand_idct(pbi, xd);
reconstruct_mb(pbi, xd);
}
/* Restore the original MV so as not to affect the entropy context. */
if (do_clamp)
{
if (xd->mbmi.mode == SPLITMV)
for (i=0; i<24; i++)
xd->block[i].bmi.mv.as_mv = orig_mvs[i];
else
{
xd->mbmi.mv.as_mv = orig_mvs[0];
xd->block[16].bmi.mv.as_mv = orig_mvs[1];
}
}
}
static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
{
int ret_val = 0;
if (vp8_read_bit(bc))
{
ret_val = vp8_read_literal(bc, 4);
if (vp8_read_bit(bc))
ret_val = -ret_val;
}
/* Trigger a quantizer update if the delta-q value has changed */
if (ret_val != prev)
*q_update = 1;
return ret_val;
}
#ifdef PACKET_TESTING
#include <stdio.h>
FILE *vpxlog = 0;
#endif
void vp8_decode_mb_row(VP8D_COMP *pbi,
VP8_COMMON *pc,
int mb_row,
MACROBLOCKD *xd)
{
int i;
int recon_yoffset, recon_uvoffset;
int mb_col;
int recon_y_stride = pc->last_frame.y_stride;
int recon_uv_stride = pc->last_frame.uv_stride;
vpx_memset(pc->left_context, 0, sizeof(pc->left_context));
recon_yoffset = mb_row * recon_y_stride * 16;
recon_uvoffset = mb_row * recon_uv_stride * 8;
// reset above block coeffs
xd->above_context[Y1CONTEXT] = pc->above_context[Y1CONTEXT];
xd->above_context[UCONTEXT ] = pc->above_context[UCONTEXT];
xd->above_context[VCONTEXT ] = pc->above_context[VCONTEXT];
xd->above_context[Y2CONTEXT] = pc->above_context[Y2CONTEXT];
xd->up_available = (mb_row != 0);
xd->mb_to_top_edge = -((mb_row * 16)) << 3;
xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
{
// Take a copy of the mode and Mv information for this macroblock into the xd->mbmi
// the partition_bmi array is unused in the decoder, so don't copy it.
vpx_memcpy(&xd->mbmi, &xd->mode_info_context->mbmi,
sizeof(MB_MODE_INFO) - sizeof(xd->mbmi.partition_bmi));
if (xd->mbmi.mode == SPLITMV || xd->mbmi.mode == B_PRED)
{
for (i = 0; i < 16; i++)
{
BLOCKD *d = &xd->block[i];
vpx_memcpy(&d->bmi, &xd->mode_info_context->bmi[i], sizeof(B_MODE_INFO));
}
}
// Distance of Mb to the various image edges.
// These specified to 8th pel as they are always compared to values that are in 1/8th pel units
xd->mb_to_left_edge = -((mb_col * 16) << 3);
xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
xd->dst.y_buffer = pc->new_frame.y_buffer + recon_yoffset;
xd->dst.u_buffer = pc->new_frame.u_buffer + recon_uvoffset;
xd->dst.v_buffer = pc->new_frame.v_buffer + recon_uvoffset;
xd->left_available = (mb_col != 0);
// Select the appropriate reference frame for this MB
if (xd->mbmi.ref_frame == LAST_FRAME)
{
xd->pre.y_buffer = pc->last_frame.y_buffer + recon_yoffset;
xd->pre.u_buffer = pc->last_frame.u_buffer + recon_uvoffset;
xd->pre.v_buffer = pc->last_frame.v_buffer + recon_uvoffset;
}
else if (xd->mbmi.ref_frame == GOLDEN_FRAME)
{
// Golden frame reconstruction buffer
xd->pre.y_buffer = pc->golden_frame.y_buffer + recon_yoffset;
xd->pre.u_buffer = pc->golden_frame.u_buffer + recon_uvoffset;
xd->pre.v_buffer = pc->golden_frame.v_buffer + recon_uvoffset;
}
else
{
// Alternate reference frame reconstruction buffer
xd->pre.y_buffer = pc->alt_ref_frame.y_buffer + recon_yoffset;
xd->pre.u_buffer = pc->alt_ref_frame.u_buffer + recon_uvoffset;
xd->pre.v_buffer = pc->alt_ref_frame.v_buffer + recon_uvoffset;
}
vp8_build_uvmvs(xd, pc->full_pixel);
/*
if(pc->current_video_frame==0 &&mb_col==1 && mb_row==0)
pbi->debugoutput =1;
else
pbi->debugoutput =0;
*/
vp8_decode_macroblock(pbi, xd);
recon_yoffset += 16;
recon_uvoffset += 8;
++xd->mode_info_context; /* next mb */
xd->gf_active_ptr++; // GF useage flag for next MB
xd->above_context[Y1CONTEXT] += 4;
xd->above_context[UCONTEXT ] += 2;
xd->above_context[VCONTEXT ] += 2;
xd->above_context[Y2CONTEXT] ++;
pbi->current_mb_col_main = mb_col;
}
// adjust to the next row of mbs
vp8_extend_mb_row(
&pc->new_frame,
xd->dst.y_buffer + 16, xd->dst.u_buffer + 8, xd->dst.v_buffer + 8
);
++xd->mode_info_context; /* skip prediction column */
pbi->last_mb_row_decoded = mb_row;
}
static unsigned int read_partition_size(const unsigned char *cx_size)
{
const unsigned int size =
cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
return size;
}
static void setup_token_decoder(VP8D_COMP *pbi,
const unsigned char *cx_data)
{
int num_part;
int i;
VP8_COMMON *pc = &pbi->common;
const unsigned char *user_data_end = pbi->Source + pbi->source_sz;
vp8_reader *bool_decoder;
const unsigned char *partition;
/* Parse number of token partitions to use */
pc->multi_token_partition = (TOKEN_PARTITION)vp8_read_literal(&pbi->bc, 2);
num_part = 1 << pc->multi_token_partition;
/* Set up pointers to the first partition */
partition = cx_data;
bool_decoder = &pbi->bc2;
if (num_part > 1)
{
CHECK_MEM_ERROR(pbi->mbc, vpx_malloc(num_part * sizeof(vp8_reader)));
bool_decoder = pbi->mbc;
partition += 3 * (num_part - 1);
}
for (i = 0; i < num_part; i++)
{
const unsigned char *partition_size_ptr = cx_data + i * 3;
unsigned int partition_size;
/* Calculate the length of this partition. The last partition
* size is implicit.
*/
if (i < num_part - 1)
{
partition_size = read_partition_size(partition_size_ptr);
}
else
{
partition_size = user_data_end - partition;
}
if (partition + partition_size > user_data_end)
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Truncated packet or corrupt partition "
"%d length", i + 1);
if (vp8dx_start_decode(bool_decoder, IF_RTCD(&pbi->dboolhuff),
partition, partition_size))
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate bool decoder %d", i + 1);
/* Advance to the next partition */
partition += partition_size;
bool_decoder++;
}
/* Clamp number of decoder threads */
if (pbi->decoding_thread_count > num_part - 1)
pbi->decoding_thread_count = num_part - 1;
}
static void stop_token_decoder(VP8D_COMP *pbi)
{
int i;
VP8_COMMON *pc = &pbi->common;
if (pc->multi_token_partition != ONE_PARTITION)
vpx_free(pbi->mbc);
}
static void init_frame(VP8D_COMP *pbi)
{
VP8_COMMON *const pc = & pbi->common;
MACROBLOCKD *const xd = & pbi->mb;
if (pc->frame_type == KEY_FRAME)
{
// Various keyframe initializations
vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));
vp8_init_mbmode_probs(pc);
vp8_default_coef_probs(pc);
vp8_kf_default_bmode_probs(pc->kf_bmode_prob);
// reset the segment feature data to 0 with delta coding (Default state).
vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
xd->mb_segement_abs_delta = SEGMENT_DELTADATA;
// reset the mode ref deltasa for loop filter
vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));
// All buffers are implicitly updated on key frames.
pc->refresh_golden_frame = 1;
pc->refresh_alt_ref_frame = 1;
pc->copy_buffer_to_gf = 0;
pc->copy_buffer_to_arf = 0;
// Note that Golden and Altref modes cannot be used on a key frame so
// ref_frame_sign_bias[] is undefined and meaningless
pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
}
else
{
if (!pc->use_bilinear_mc_filter)
pc->mcomp_filter_type = SIXTAP;
else
pc->mcomp_filter_type = BILINEAR;
// To enable choice of different interploation filters
if (pc->mcomp_filter_type == SIXTAP)
{
xd->subpixel_predict = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap4x4);
xd->subpixel_predict8x4 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap8x4);
xd->subpixel_predict8x8 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap8x8);
xd->subpixel_predict16x16 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), sixtap16x16);
}
else
{
xd->subpixel_predict = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear4x4);
xd->subpixel_predict8x4 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear8x4);
xd->subpixel_predict8x8 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear8x8);
xd->subpixel_predict16x16 = SUBPIX_INVOKE(RTCD_VTABLE(subpix), bilinear16x16);
}
}
xd->left_context = pc->left_context;
xd->mode_info_context = pc->mi;
xd->frame_type = pc->frame_type;
xd->mbmi.mode = DC_PRED;
xd->mode_info_stride = pc->mode_info_stride;
}
int vp8_decode_frame(VP8D_COMP *pbi)
{
vp8_reader *const bc = & pbi->bc;
VP8_COMMON *const pc = & pbi->common;
MACROBLOCKD *const xd = & pbi->mb;
const unsigned char *data = (const unsigned char *)pbi->Source;
const unsigned char *const data_end = data + pbi->source_sz;
int first_partition_length_in_bytes;
int mb_row;
int i, j, k, l;
const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
pc->frame_type = (FRAME_TYPE)(data[0] & 1);
pc->version = (data[0] >> 1) & 7;
pc->show_frame = (data[0] >> 4) & 1;
first_partition_length_in_bytes =
(data[0] | (data[1] << 8) | (data[2] << 16)) >> 5;
data += 3;
if (data + first_partition_length_in_bytes > data_end)
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Truncated packet or corrupt partition 0 length");
vp8_setup_version(pc);
if (pc->frame_type == KEY_FRAME)
{
const int Width = pc->Width;
const int Height = pc->Height;
// vet via sync code
if (data[0] != 0x9d || data[1] != 0x01 || data[2] != 0x2a)
vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,
"Invalid frame sync code");
pc->Width = (data[3] | (data[4] << 8)) & 0x3fff;
pc->horiz_scale = data[4] >> 6;
pc->Height = (data[5] | (data[6] << 8)) & 0x3fff;
pc->vert_scale = data[6] >> 6;
data += 7;
if (Width != pc->Width || Height != pc->Height)
{
if (pc->Width <= 0)
{
pc->Width = Width;
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Invalid frame width");
}
if (pc->Height <= 0)
{
pc->Height = Height;
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Invalid frame height");
}
if (vp8_alloc_frame_buffers(pc, pc->Width, pc->Height))
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate frame buffers");
}
}
if (pc->Width == 0 || pc->Height == 0)
{
return -1;
}
init_frame(pbi);
if (vp8dx_start_decode(bc, IF_RTCD(&pbi->dboolhuff),
data, data_end - data))
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate bool decoder 0");
if (pc->frame_type == KEY_FRAME) {
pc->clr_type = (YUV_TYPE)vp8_read_bit(bc);
pc->clamp_type = (CLAMP_TYPE)vp8_read_bit(bc);
}
// Is segmentation enabled
xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);
if (xd->segmentation_enabled)
{
// Signal whether or not the segmentation map is being explicitly updated this frame.
xd->update_mb_segmentation_map = (unsigned char)vp8_read_bit(bc);
xd->update_mb_segmentation_data = (unsigned char)vp8_read_bit(bc);
if (xd->update_mb_segmentation_data)
{
xd->mb_segement_abs_delta = (unsigned char)vp8_read_bit(bc);
vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
// For each segmentation feature (Quant and loop filter level)
for (i = 0; i < MB_LVL_MAX; i++)
{
for (j = 0; j < MAX_MB_SEGMENTS; j++)
{
// Frame level data
if (vp8_read_bit(bc))
{
xd->segment_feature_data[i][j] = (signed char)vp8_read_literal(bc, mb_feature_data_bits[i]);
if (vp8_read_bit(bc))
xd->segment_feature_data[i][j] = -xd->segment_feature_data[i][j];
}
else
xd->segment_feature_data[i][j] = 0;
}
}
}
if (xd->update_mb_segmentation_map)
{
// Which macro block level features are enabled
vpx_memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));
// Read the probs used to decode the segment id for each macro block.
for (i = 0; i < MB_FEATURE_TREE_PROBS; i++)
{
// If not explicitly set value is defaulted to 255 by memset above
if (vp8_read_bit(bc))
xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);
}
}
}
// Read the loop filter level and type
pc->filter_type = (LOOPFILTERTYPE) vp8_read_bit(bc);
pc->filter_level = vp8_read_literal(bc, 6);
pc->sharpness_level = vp8_read_literal(bc, 3);
// Read in loop filter deltas applied at the MB level based on mode or ref frame.
xd->mode_ref_lf_delta_update = 0;
xd->mode_ref_lf_delta_enabled = (unsigned char)vp8_read_bit(bc);
if (xd->mode_ref_lf_delta_enabled)
{
// Do the deltas need to be updated
xd->mode_ref_lf_delta_update = (unsigned char)vp8_read_bit(bc);
if (xd->mode_ref_lf_delta_update)
{
// Send update
for (i = 0; i < MAX_REF_LF_DELTAS; i++)
{
if (vp8_read_bit(bc))
{
//sign = vp8_read_bit( bc );
xd->ref_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
if (vp8_read_bit(bc)) // Apply sign
xd->ref_lf_deltas[i] = xd->ref_lf_deltas[i] * -1;
}
}
// Send update
for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
{
if (vp8_read_bit(bc))
{
//sign = vp8_read_bit( bc );
xd->mode_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);
if (vp8_read_bit(bc)) // Apply sign
xd->mode_lf_deltas[i] = xd->mode_lf_deltas[i] * -1;
}
}
}
}
setup_token_decoder(pbi, data + first_partition_length_in_bytes);
xd->current_bc = &pbi->bc2;
// Read the default quantizers.
{
int Q, q_update;
Q = vp8_read_literal(bc, 7); // AC 1st order Q = default
pc->base_qindex = Q;
q_update = 0;
pc->y1dc_delta_q = get_delta_q(bc, pc->y1dc_delta_q, &q_update);
pc->y2dc_delta_q = get_delta_q(bc, pc->y2dc_delta_q, &q_update);
pc->y2ac_delta_q = get_delta_q(bc, pc->y2ac_delta_q, &q_update);
pc->uvdc_delta_q = get_delta_q(bc, pc->uvdc_delta_q, &q_update);
pc->uvac_delta_q = get_delta_q(bc, pc->uvac_delta_q, &q_update);
if (q_update)
vp8cx_init_de_quantizer(pbi);
// MB level dequantizer setup
mb_init_dequantizer(pbi, &pbi->mb);
}
// Determine if the golden frame or ARF buffer should be updated and how.
// For all non key frames the GF and ARF refresh flags and sign bias
// flags must be set explicitly.
if (pc->frame_type != KEY_FRAME)
{
// Should the GF or ARF be updated from the current frame
pc->refresh_golden_frame = vp8_read_bit(bc);
pc->refresh_alt_ref_frame = vp8_read_bit(bc);
// Buffer to buffer copy flags.
pc->copy_buffer_to_gf = 0;
if (!pc->refresh_golden_frame)
pc->copy_buffer_to_gf = vp8_read_literal(bc, 2);
pc->copy_buffer_to_arf = 0;
if (!pc->refresh_alt_ref_frame)
pc->copy_buffer_to_arf = vp8_read_literal(bc, 2);
pc->ref_frame_sign_bias[GOLDEN_FRAME] = vp8_read_bit(bc);
pc->ref_frame_sign_bias[ALTREF_FRAME] = vp8_read_bit(bc);
}
pc->refresh_entropy_probs = vp8_read_bit(bc);
if (pc->refresh_entropy_probs == 0)
{
vpx_memcpy(&pc->lfc, &pc->fc, sizeof(pc->fc));
}
pc->refresh_last_frame = pc->frame_type == KEY_FRAME || vp8_read_bit(bc);
if (0)
{
FILE *z = fopen("decodestats.stt", "a");
fprintf(z, "%6d F:%d,G:%d,A:%d,L:%d,Q:%d\n",
pc->current_video_frame,
pc->frame_type,
pc->refresh_golden_frame,
pc->refresh_alt_ref_frame,
pc->refresh_last_frame,
pc->base_qindex);
fclose(z);
}
{
// read coef probability tree
for (i = 0; i < BLOCK_TYPES; i++)
for (j = 0; j < COEF_BANDS; j++)
for (k = 0; k < PREV_COEF_CONTEXTS; k++)
for (l = 0; l < MAX_ENTROPY_TOKENS - 1; l++)
{
vp8_prob *const p = pc->fc.coef_probs [i][j][k] + l;
if (vp8_read(bc, vp8_coef_update_probs [i][j][k][l]))
{
*p = (vp8_prob)vp8_read_literal(bc, 8);
}
}
}
vpx_memcpy(&xd->pre, &pc->last_frame, sizeof(YV12_BUFFER_CONFIG));
vpx_memcpy(&xd->dst, &pc->new_frame, sizeof(YV12_BUFFER_CONFIG));
// set up frame new frame for intra coded blocks
vp8_setup_intra_recon(&pc->new_frame);
vp8_setup_block_dptrs(xd);
vp8_build_block_doffsets(xd);
// clear out the coeff buffer
vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
// Read the mb_no_coeff_skip flag
pc->mb_no_coeff_skip = (int)vp8_read_bit(bc);
if (pc->frame_type == KEY_FRAME)
vp8_kfread_modes(pbi);
else
vp8_decode_mode_mvs(pbi);
// reset since these guys are used as iterators
vpx_memset(pc->above_context[Y1CONTEXT], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 4);
vpx_memset(pc->above_context[UCONTEXT ], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 2);
vpx_memset(pc->above_context[VCONTEXT ], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols * 2);
vpx_memset(pc->above_context[Y2CONTEXT], 0, sizeof(ENTROPY_CONTEXT) * pc->mb_cols);
xd->gf_active_ptr = (signed char *)pc->gf_active_flags; // Point to base of GF active flags data structure
vpx_memcpy(&xd->block[0].bmi, &xd->mode_info_context->bmi[0], sizeof(B_MODE_INFO));
if (pbi->b_multithreaded_lf && pc->filter_level != 0)
vp8_start_lfthread(pbi);
if (pbi->b_multithreaded_rd && pc->multi_token_partition != ONE_PARTITION)
{
vp8_mtdecode_mb_rows(pbi, xd);
}
else
{
int ibc = 0;
int num_part = 1 << pc->multi_token_partition;
// Decode the individual macro block
for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
{
if (num_part > 1)
{
xd->current_bc = & pbi->mbc[ibc];
ibc++;
if (ibc == num_part)
ibc = 0;
}
vp8_decode_mb_row(pbi, pc, mb_row, xd);
}
pbi->last_mb_row_decoded = mb_row;
}
stop_token_decoder(pbi);
// vpx_log("Decoder: Frame Decoded, Size Roughly:%d bytes \n",bc->pos+pbi->bc2.pos);
// If this was a kf or Gf note the Q used
if ((pc->frame_type == KEY_FRAME) ||
pc->refresh_golden_frame || pc->refresh_alt_ref_frame)
{
pc->last_kf_gf_q = pc->base_qindex;
}
if (pc->refresh_entropy_probs == 0)
{
vpx_memcpy(&pc->fc, &pc->lfc, sizeof(pc->fc));
}
#ifdef PACKET_TESTING
{
FILE *f = fopen("decompressor.VP8", "ab");
unsigned int size = pbi->bc2.pos + pbi->bc.pos + 8;
fwrite((void *) &size, 4, 1, f);
fwrite((void *) pbi->Source, size, 1, f);
fclose(f);
}
#endif
return 0;
}
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