diff options
Diffstat (limited to 'source/libvpx/vp9/decoder/vp9_decodeframe.c')
| -rw-r--r-- | source/libvpx/vp9/decoder/vp9_decodeframe.c | 1431 |
1 files changed, 1431 insertions, 0 deletions
diff --git a/source/libvpx/vp9/decoder/vp9_decodeframe.c b/source/libvpx/vp9/decoder/vp9_decodeframe.c new file mode 100644 index 0000000..79f0835 --- /dev/null +++ b/source/libvpx/vp9/decoder/vp9_decodeframe.c @@ -0,0 +1,1431 @@ +/* + * Copyright (c) 2010 The WebM 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 <assert.h> +#include <stdlib.h> // qsort() + +#include "./vp9_rtcd.h" +#include "./vpx_scale_rtcd.h" + +#include "vpx_mem/vpx_mem.h" +#include "vpx_scale/vpx_scale.h" + +#include "vp9/common/vp9_alloccommon.h" +#include "vp9/common/vp9_common.h" +#include "vp9/common/vp9_entropy.h" +#include "vp9/common/vp9_entropymode.h" +#include "vp9/common/vp9_idct.h" +#include "vp9/common/vp9_pred_common.h" +#include "vp9/common/vp9_quant_common.h" +#include "vp9/common/vp9_reconintra.h" +#include "vp9/common/vp9_reconinter.h" +#include "vp9/common/vp9_seg_common.h" +#include "vp9/common/vp9_tile_common.h" + +#include "vp9/decoder/vp9_dboolhuff.h" +#include "vp9/decoder/vp9_decodeframe.h" +#include "vp9/decoder/vp9_detokenize.h" +#include "vp9/decoder/vp9_decodemv.h" +#include "vp9/decoder/vp9_dsubexp.h" +#include "vp9/decoder/vp9_onyxd_int.h" +#include "vp9/decoder/vp9_read_bit_buffer.h" +#include "vp9/decoder/vp9_thread.h" + +typedef struct TileWorkerData { + VP9_COMMON *cm; + vp9_reader bit_reader; + DECLARE_ALIGNED(16, MACROBLOCKD, xd); + DECLARE_ALIGNED(16, int16_t, dqcoeff[MAX_MB_PLANE][64 * 64]); +} TileWorkerData; + +static int read_be32(const uint8_t *p) { + return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; +} + +static int is_compound_reference_allowed(const VP9_COMMON *cm) { + int i; + for (i = 1; i < REFS_PER_FRAME; ++i) + if (cm->ref_frame_sign_bias[i + 1] != cm->ref_frame_sign_bias[1]) + return 1; + + return 0; +} + +static void setup_compound_reference(VP9_COMMON *cm) { + if (cm->ref_frame_sign_bias[LAST_FRAME] == + cm->ref_frame_sign_bias[GOLDEN_FRAME]) { + cm->comp_fixed_ref = ALTREF_FRAME; + cm->comp_var_ref[0] = LAST_FRAME; + cm->comp_var_ref[1] = GOLDEN_FRAME; + } else if (cm->ref_frame_sign_bias[LAST_FRAME] == + cm->ref_frame_sign_bias[ALTREF_FRAME]) { + cm->comp_fixed_ref = GOLDEN_FRAME; + cm->comp_var_ref[0] = LAST_FRAME; + cm->comp_var_ref[1] = ALTREF_FRAME; + } else { + cm->comp_fixed_ref = LAST_FRAME; + cm->comp_var_ref[0] = GOLDEN_FRAME; + cm->comp_var_ref[1] = ALTREF_FRAME; + } +} + +// len == 0 is not allowed +static int read_is_valid(const uint8_t *start, size_t len, const uint8_t *end) { + return start + len > start && start + len <= end; +} + +static int decode_unsigned_max(struct vp9_read_bit_buffer *rb, int max) { + const int data = vp9_rb_read_literal(rb, get_unsigned_bits(max)); + return data > max ? max : data; +} + +static TX_MODE read_tx_mode(vp9_reader *r) { + TX_MODE tx_mode = vp9_read_literal(r, 2); + if (tx_mode == ALLOW_32X32) + tx_mode += vp9_read_bit(r); + return tx_mode; +} + +static void read_tx_mode_probs(struct tx_probs *tx_probs, vp9_reader *r) { + int i, j; + + for (i = 0; i < TX_SIZE_CONTEXTS; ++i) + for (j = 0; j < TX_SIZES - 3; ++j) + vp9_diff_update_prob(r, &tx_probs->p8x8[i][j]); + + for (i = 0; i < TX_SIZE_CONTEXTS; ++i) + for (j = 0; j < TX_SIZES - 2; ++j) + vp9_diff_update_prob(r, &tx_probs->p16x16[i][j]); + + for (i = 0; i < TX_SIZE_CONTEXTS; ++i) + for (j = 0; j < TX_SIZES - 1; ++j) + vp9_diff_update_prob(r, &tx_probs->p32x32[i][j]); +} + +static void read_switchable_interp_probs(FRAME_CONTEXT *fc, vp9_reader *r) { + int i, j; + for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j) + for (i = 0; i < SWITCHABLE_FILTERS - 1; ++i) + vp9_diff_update_prob(r, &fc->switchable_interp_prob[j][i]); +} + +static void read_inter_mode_probs(FRAME_CONTEXT *fc, vp9_reader *r) { + int i, j; + for (i = 0; i < INTER_MODE_CONTEXTS; ++i) + for (j = 0; j < INTER_MODES - 1; ++j) + vp9_diff_update_prob(r, &fc->inter_mode_probs[i][j]); +} + +static REFERENCE_MODE read_reference_mode(VP9_COMMON *cm, vp9_reader *r) { + if (is_compound_reference_allowed(cm)) { + REFERENCE_MODE mode = vp9_read_bit(r); + if (mode) + mode += vp9_read_bit(r); + setup_compound_reference(cm); + return mode; + } else { + return SINGLE_REFERENCE; + } +} + +static void read_reference_mode_probs(VP9_COMMON *cm, vp9_reader *r) { + int i; + if (cm->reference_mode == REFERENCE_MODE_SELECT) + for (i = 0; i < COMP_INTER_CONTEXTS; i++) + vp9_diff_update_prob(r, &cm->fc.comp_inter_prob[i]); + + if (cm->reference_mode != COMPOUND_REFERENCE) + for (i = 0; i < REF_CONTEXTS; i++) { + vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][0]); + vp9_diff_update_prob(r, &cm->fc.single_ref_prob[i][1]); + } + + if (cm->reference_mode != SINGLE_REFERENCE) + for (i = 0; i < REF_CONTEXTS; i++) + vp9_diff_update_prob(r, &cm->fc.comp_ref_prob[i]); +} + +static void update_mv_probs(vp9_prob *p, int n, vp9_reader *r) { + int i; + for (i = 0; i < n; ++i) + if (vp9_read(r, NMV_UPDATE_PROB)) + p[i] = (vp9_read_literal(r, 7) << 1) | 1; +} + +static void read_mv_probs(nmv_context *ctx, int allow_hp, vp9_reader *r) { + int i, j; + + update_mv_probs(ctx->joints, MV_JOINTS - 1, r); + + for (i = 0; i < 2; ++i) { + nmv_component *const comp_ctx = &ctx->comps[i]; + update_mv_probs(&comp_ctx->sign, 1, r); + update_mv_probs(comp_ctx->classes, MV_CLASSES - 1, r); + update_mv_probs(comp_ctx->class0, CLASS0_SIZE - 1, r); + update_mv_probs(comp_ctx->bits, MV_OFFSET_BITS, r); + } + + for (i = 0; i < 2; ++i) { + nmv_component *const comp_ctx = &ctx->comps[i]; + for (j = 0; j < CLASS0_SIZE; ++j) + update_mv_probs(comp_ctx->class0_fp[j], MV_FP_SIZE - 1, r); + update_mv_probs(comp_ctx->fp, 3, r); + } + + if (allow_hp) { + for (i = 0; i < 2; ++i) { + nmv_component *const comp_ctx = &ctx->comps[i]; + update_mv_probs(&comp_ctx->class0_hp, 1, r); + update_mv_probs(&comp_ctx->hp, 1, r); + } + } +} + +static void setup_plane_dequants(VP9_COMMON *cm, MACROBLOCKD *xd, int q_index) { + int i; + xd->plane[0].dequant = cm->y_dequant[q_index]; + + for (i = 1; i < MAX_MB_PLANE; i++) + xd->plane[i].dequant = cm->uv_dequant[q_index]; +} + +// Allocate storage for each tile column. +// TODO(jzern): when max_threads <= 1 the same storage could be used for each +// tile. +static void alloc_tile_storage(VP9D_COMP *pbi, int tile_rows, int tile_cols) { + VP9_COMMON *const cm = &pbi->common; + const int aligned_mi_cols = mi_cols_aligned_to_sb(cm->mi_cols); + int i, tile_row, tile_col; + + CHECK_MEM_ERROR(cm, pbi->mi_streams, + vpx_realloc(pbi->mi_streams, tile_rows * tile_cols * + sizeof(*pbi->mi_streams))); + for (tile_row = 0; tile_row < tile_rows; ++tile_row) { + for (tile_col = 0; tile_col < tile_cols; ++tile_col) { + TileInfo tile; + vp9_tile_init(&tile, cm, tile_row, tile_col); + pbi->mi_streams[tile_row * tile_cols + tile_col] = + &cm->mi[tile.mi_row_start * cm->mode_info_stride + + tile.mi_col_start]; + } + } + + // 2 contexts per 'mi unit', so that we have one context per 4x4 txfm + // block where mi unit size is 8x8. + CHECK_MEM_ERROR(cm, pbi->above_context[0], + vpx_realloc(pbi->above_context[0], + sizeof(*pbi->above_context[0]) * MAX_MB_PLANE * + 2 * aligned_mi_cols)); + for (i = 1; i < MAX_MB_PLANE; ++i) { + pbi->above_context[i] = pbi->above_context[0] + + i * sizeof(*pbi->above_context[0]) * + 2 * aligned_mi_cols; + } + + // This is sized based on the entire frame. Each tile operates within its + // column bounds. + CHECK_MEM_ERROR(cm, pbi->above_seg_context, + vpx_realloc(pbi->above_seg_context, + sizeof(*pbi->above_seg_context) * + aligned_mi_cols)); +} + +static void inverse_transform_block(MACROBLOCKD* xd, int plane, int block, + TX_SIZE tx_size, uint8_t *dst, int stride, + int eob) { + struct macroblockd_plane *const pd = &xd->plane[plane]; + if (eob > 0) { + TX_TYPE tx_type; + const int plane_type = pd->plane_type; + int16_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block); + switch (tx_size) { + case TX_4X4: + tx_type = get_tx_type_4x4(plane_type, xd, block); + if (tx_type == DCT_DCT) + xd->itxm_add(dqcoeff, dst, stride, eob); + else + vp9_iht4x4_16_add(dqcoeff, dst, stride, tx_type); + break; + case TX_8X8: + tx_type = get_tx_type_8x8(plane_type, xd); + vp9_iht8x8_add(tx_type, dqcoeff, dst, stride, eob); + break; + case TX_16X16: + tx_type = get_tx_type_16x16(plane_type, xd); + vp9_iht16x16_add(tx_type, dqcoeff, dst, stride, eob); + break; + case TX_32X32: + tx_type = DCT_DCT; + vp9_idct32x32_add(dqcoeff, dst, stride, eob); + break; + default: + assert(0 && "Invalid transform size"); + } + + if (eob == 1) { + vpx_memset(dqcoeff, 0, 2 * sizeof(dqcoeff[0])); + } else { + if (tx_type == DCT_DCT && tx_size <= TX_16X16 && eob <= 10) + vpx_memset(dqcoeff, 0, 4 * (4 << tx_size) * sizeof(dqcoeff[0])); + else if (tx_size == TX_32X32 && eob <= 34) + vpx_memset(dqcoeff, 0, 256 * sizeof(dqcoeff[0])); + else + vpx_memset(dqcoeff, 0, (16 << (tx_size << 1)) * sizeof(dqcoeff[0])); + } + } +} + +struct intra_args { + VP9_COMMON *cm; + MACROBLOCKD *xd; + vp9_reader *r; +}; + +static void predict_and_reconstruct_intra_block(int plane, int block, + BLOCK_SIZE plane_bsize, + TX_SIZE tx_size, void *arg) { + struct intra_args *const args = arg; + VP9_COMMON *const cm = args->cm; + MACROBLOCKD *const xd = args->xd; + struct macroblockd_plane *const pd = &xd->plane[plane]; + MODE_INFO *const mi = xd->mi_8x8[0]; + const MB_PREDICTION_MODE mode = (plane == 0) + ? ((mi->mbmi.sb_type < BLOCK_8X8) ? mi->bmi[block].as_mode + : mi->mbmi.mode) + : mi->mbmi.uv_mode; + int x, y; + uint8_t *dst; + txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &x, &y); + dst = &pd->dst.buf[4 * y * pd->dst.stride + 4 * x]; + + if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0) + extend_for_intra(xd, plane_bsize, plane, x, y); + + vp9_predict_intra_block(xd, block >> (tx_size << 1), + b_width_log2(plane_bsize), tx_size, mode, + dst, pd->dst.stride, dst, pd->dst.stride); + + if (!mi->mbmi.skip_coeff) { + const int eob = vp9_decode_block_tokens(cm, xd, plane, block, + plane_bsize, x, y, tx_size, + args->r); + inverse_transform_block(xd, plane, block, tx_size, dst, pd->dst.stride, + eob); + } +} + +struct inter_args { + VP9_COMMON *cm; + MACROBLOCKD *xd; + vp9_reader *r; + int *eobtotal; +}; + +static void reconstruct_inter_block(int plane, int block, + BLOCK_SIZE plane_bsize, + TX_SIZE tx_size, void *arg) { + struct inter_args *args = arg; + VP9_COMMON *const cm = args->cm; + MACROBLOCKD *const xd = args->xd; + struct macroblockd_plane *const pd = &xd->plane[plane]; + int x, y, eob; + txfrm_block_to_raster_xy(plane_bsize, tx_size, block, &x, &y); + eob = vp9_decode_block_tokens(cm, xd, plane, block, plane_bsize, x, y, + tx_size, args->r); + inverse_transform_block(xd, plane, block, tx_size, + &pd->dst.buf[4 * y * pd->dst.stride + 4 * x], + pd->dst.stride, eob); + *args->eobtotal += eob; +} + +static void set_offsets(VP9_COMMON *const cm, MACROBLOCKD *const xd, + const TileInfo *const tile, + BLOCK_SIZE bsize, int mi_row, int mi_col) { + const int bw = num_8x8_blocks_wide_lookup[bsize]; + const int bh = num_8x8_blocks_high_lookup[bsize]; + const int x_mis = MIN(bw, cm->mi_cols - mi_col); + const int y_mis = MIN(bh, cm->mi_rows - mi_row); + const int offset = mi_row * cm->mode_info_stride + mi_col; + const int tile_offset = tile->mi_row_start * cm->mode_info_stride + + tile->mi_col_start; + int x, y; + + xd->mi_8x8 = cm->mi_grid_visible + offset; + xd->prev_mi_8x8 = cm->prev_mi_grid_visible + offset; + // Special case: if prev_mi is NULL, the previous mode info context + // cannot be used. + xd->last_mi = cm->prev_mi ? xd->prev_mi_8x8[0] : NULL; + + xd->mi_8x8[0] = xd->mi_stream + offset - tile_offset; + xd->mi_8x8[0]->mbmi.sb_type = bsize; + for (y = 0; y < y_mis; ++y) + for (x = !y; x < x_mis; ++x) + xd->mi_8x8[y * cm->mode_info_stride + x] = xd->mi_8x8[0]; + + set_skip_context(xd, xd->above_context, xd->left_context, mi_row, mi_col); + + // Distance of Mb to the various image edges. These are specified to 8th pel + // as they are always compared to values that are in 1/8th pel units + set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols); + + setup_dst_planes(xd, get_frame_new_buffer(cm), mi_row, mi_col); +} + +static void set_ref(VP9_COMMON *const cm, MACROBLOCKD *const xd, + int idx, int mi_row, int mi_col) { + MB_MODE_INFO *const mbmi = &xd->mi_8x8[0]->mbmi; + const int ref = mbmi->ref_frame[idx] - LAST_FRAME; + const YV12_BUFFER_CONFIG *cfg = get_frame_ref_buffer(cm, ref); + const struct scale_factors_common *sfc = &cm->active_ref_scale_comm[ref]; + + xd->ref_buf[idx] = cfg; + if (!vp9_is_valid_scale(sfc)) + vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, + "Invalid scale factors"); + + xd->scale_factor[idx].sfc = sfc; + setup_pre_planes(xd, idx, cfg, mi_row, mi_col, &xd->scale_factor[idx]); + xd->corrupted |= cfg->corrupted; +} + +static void decode_modes_b(VP9_COMMON *const cm, MACROBLOCKD *const xd, + const TileInfo *const tile, + int mi_row, int mi_col, + vp9_reader *r, BLOCK_SIZE bsize) { + const int less8x8 = bsize < BLOCK_8X8; + MB_MODE_INFO *mbmi; + + set_offsets(cm, xd, tile, bsize, mi_row, mi_col); + vp9_read_mode_info(cm, xd, tile, mi_row, mi_col, r); + + if (less8x8) + bsize = BLOCK_8X8; + + // Has to be called after set_offsets + mbmi = &xd->mi_8x8[0]->mbmi; + + if (mbmi->skip_coeff) { + reset_skip_context(xd, bsize); + } else { + if (cm->seg.enabled) + setup_plane_dequants(cm, xd, vp9_get_qindex(&cm->seg, mbmi->segment_id, + cm->base_qindex)); + } + + if (!is_inter_block(mbmi)) { + struct intra_args arg = { cm, xd, r }; + foreach_transformed_block(xd, bsize, predict_and_reconstruct_intra_block, + &arg); + } else { + // Setup + set_ref(cm, xd, 0, mi_row, mi_col); + if (has_second_ref(mbmi)) + set_ref(cm, xd, 1, mi_row, mi_col); + + xd->subpix.filter_x = xd->subpix.filter_y = + vp9_get_filter_kernel(mbmi->interp_filter); + + // Prediction + vp9_dec_build_inter_predictors_sb(xd, mi_row, mi_col, bsize); + + // Reconstruction + if (!mbmi->skip_coeff) { + int eobtotal = 0; + struct inter_args arg = { cm, xd, r, &eobtotal }; + foreach_transformed_block(xd, bsize, reconstruct_inter_block, &arg); + if (!less8x8 && eobtotal == 0) + mbmi->skip_coeff = 1; // skip loopfilter + } + } + + xd->corrupted |= vp9_reader_has_error(r); +} + +static PARTITION_TYPE read_partition(VP9_COMMON *cm, MACROBLOCKD *xd, int hbs, + int mi_row, int mi_col, BLOCK_SIZE bsize, + vp9_reader *r) { + const int ctx = partition_plane_context(xd->above_seg_context, + xd->left_seg_context, + mi_row, mi_col, bsize); + const vp9_prob *const probs = get_partition_probs(cm, ctx); + const int has_rows = (mi_row + hbs) < cm->mi_rows; + const int has_cols = (mi_col + hbs) < cm->mi_cols; + PARTITION_TYPE p; + + if (has_rows && has_cols) + p = vp9_read_tree(r, vp9_partition_tree, probs); + else if (!has_rows && has_cols) + p = vp9_read(r, probs[1]) ? PARTITION_SPLIT : PARTITION_HORZ; + else if (has_rows && !has_cols) + p = vp9_read(r, probs[2]) ? PARTITION_SPLIT : PARTITION_VERT; + else + p = PARTITION_SPLIT; + + if (!cm->frame_parallel_decoding_mode) + ++cm->counts.partition[ctx][p]; + + return p; +} + +static void decode_modes_sb(VP9_COMMON *const cm, MACROBLOCKD *const xd, + const TileInfo *const tile, + int mi_row, int mi_col, + vp9_reader* r, BLOCK_SIZE bsize) { + const int hbs = num_8x8_blocks_wide_lookup[bsize] / 2; + PARTITION_TYPE partition; + BLOCK_SIZE subsize; + + if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) + return; + + partition = read_partition(cm, xd, hbs, mi_row, mi_col, bsize, r); + subsize = get_subsize(bsize, partition); + if (subsize < BLOCK_8X8) { + decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize); + } else { + switch (partition) { + case PARTITION_NONE: + decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize); + break; + case PARTITION_HORZ: + decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize); + if (mi_row + hbs < cm->mi_rows) + decode_modes_b(cm, xd, tile, mi_row + hbs, mi_col, r, subsize); + break; + case PARTITION_VERT: + decode_modes_b(cm, xd, tile, mi_row, mi_col, r, subsize); + if (mi_col + hbs < cm->mi_cols) + decode_modes_b(cm, xd, tile, mi_row, mi_col + hbs, r, subsize); + break; + case PARTITION_SPLIT: + decode_modes_sb(cm, xd, tile, mi_row, mi_col, r, subsize); + decode_modes_sb(cm, xd, tile, mi_row, mi_col + hbs, r, subsize); + decode_modes_sb(cm, xd, tile, mi_row + hbs, mi_col, r, subsize); + decode_modes_sb(cm, xd, tile, mi_row + hbs, mi_col + hbs, r, subsize); + break; + default: + assert(0 && "Invalid partition type"); + } + } + + // update partition context + if (bsize >= BLOCK_8X8 && + (bsize == BLOCK_8X8 || partition != PARTITION_SPLIT)) + update_partition_context(xd->above_seg_context, xd->left_seg_context, + mi_row, mi_col, subsize, bsize); +} + +static void setup_token_decoder(const uint8_t *data, + const uint8_t *data_end, + size_t read_size, + struct vpx_internal_error_info *error_info, + vp9_reader *r) { + // Validate the calculated partition length. If the buffer + // described by the partition can't be fully read, then restrict + // it to the portion that can be (for EC mode) or throw an error. + if (!read_is_valid(data, read_size, data_end)) + vpx_internal_error(error_info, VPX_CODEC_CORRUPT_FRAME, + "Truncated packet or corrupt tile length"); + + if (vp9_reader_init(r, data, read_size)) + vpx_internal_error(error_info, VPX_CODEC_MEM_ERROR, + "Failed to allocate bool decoder %d", 1); +} + +static void read_coef_probs_common(vp9_coeff_probs_model *coef_probs, + vp9_reader *r) { + int i, j, k, l, m; + + if (vp9_read_bit(r)) + for (i = 0; i < PLANE_TYPES; ++i) + for (j = 0; j < REF_TYPES; ++j) + for (k = 0; k < COEF_BANDS; ++k) + for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l) + for (m = 0; m < UNCONSTRAINED_NODES; ++m) + vp9_diff_update_prob(r, &coef_probs[i][j][k][l][m]); +} + +static void read_coef_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode, + vp9_reader *r) { + const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode]; + TX_SIZE tx_size; + for (tx_size = TX_4X4; tx_size <= max_tx_size; ++tx_size) + read_coef_probs_common(fc->coef_probs[tx_size], r); +} + +static void setup_segmentation(struct segmentation *seg, + struct vp9_read_bit_buffer *rb) { + int i, j; + + seg->update_map = 0; + seg->update_data = 0; + + seg->enabled = vp9_rb_read_bit(rb); + if (!seg->enabled) + return; + + // Segmentation map update + seg->update_map = vp9_rb_read_bit(rb); + if (seg->update_map) { + for (i = 0; i < SEG_TREE_PROBS; i++) + seg->tree_probs[i] = vp9_rb_read_bit(rb) ? vp9_rb_read_literal(rb, 8) + : MAX_PROB; + + seg->temporal_update = vp9_rb_read_bit(rb); + if (seg->temporal_update) { + for (i = 0; i < PREDICTION_PROBS; i++) + seg->pred_probs[i] = vp9_rb_read_bit(rb) ? vp9_rb_read_literal(rb, 8) + : MAX_PROB; + } else { + for (i = 0; i < PREDICTION_PROBS; i++) + seg->pred_probs[i] = MAX_PROB; + } + } + + // Segmentation data update + seg->update_data = vp9_rb_read_bit(rb); + if (seg->update_data) { + seg->abs_delta = vp9_rb_read_bit(rb); + + vp9_clearall_segfeatures(seg); + + for (i = 0; i < MAX_SEGMENTS; i++) { + for (j = 0; j < SEG_LVL_MAX; j++) { + int data = 0; + const int feature_enabled = vp9_rb_read_bit(rb); + if (feature_enabled) { + vp9_enable_segfeature(seg, i, j); + data = decode_unsigned_max(rb, vp9_seg_feature_data_max(j)); + if (vp9_is_segfeature_signed(j)) + data = vp9_rb_read_bit(rb) ? -data : data; + } + vp9_set_segdata(seg, i, j, data); + } + } + } +} + +static void setup_loopfilter(struct loopfilter *lf, + struct vp9_read_bit_buffer *rb) { + lf->filter_level = vp9_rb_read_literal(rb, 6); + lf->sharpness_level = vp9_rb_read_literal(rb, 3); + + // Read in loop filter deltas applied at the MB level based on mode or ref + // frame. + lf->mode_ref_delta_update = 0; + + lf->mode_ref_delta_enabled = vp9_rb_read_bit(rb); + if (lf->mode_ref_delta_enabled) { + lf->mode_ref_delta_update = vp9_rb_read_bit(rb); + if (lf->mode_ref_delta_update) { + int i; + + for (i = 0; i < MAX_REF_LF_DELTAS; i++) + if (vp9_rb_read_bit(rb)) + lf->ref_deltas[i] = vp9_rb_read_signed_literal(rb, 6); + + for (i = 0; i < MAX_MODE_LF_DELTAS; i++) + if (vp9_rb_read_bit(rb)) + lf->mode_deltas[i] = vp9_rb_read_signed_literal(rb, 6); + } + } +} + +static int read_delta_q(struct vp9_read_bit_buffer *rb, int *delta_q) { + const int old = *delta_q; + *delta_q = vp9_rb_read_bit(rb) ? vp9_rb_read_signed_literal(rb, 4) : 0; + return old != *delta_q; +} + +static void setup_quantization(VP9_COMMON *const cm, MACROBLOCKD *const xd, + struct vp9_read_bit_buffer *rb) { + int update = 0; + + cm->base_qindex = vp9_rb_read_literal(rb, QINDEX_BITS); + update |= read_delta_q(rb, &cm->y_dc_delta_q); + update |= read_delta_q(rb, &cm->uv_dc_delta_q); + update |= read_delta_q(rb, &cm->uv_ac_delta_q); + if (update) + vp9_init_dequantizer(cm); + + xd->lossless = cm->base_qindex == 0 && + cm->y_dc_delta_q == 0 && + cm->uv_dc_delta_q == 0 && + cm->uv_ac_delta_q == 0; + + xd->itxm_add = xd->lossless ? vp9_iwht4x4_add : vp9_idct4x4_add; +} + +static INTERPOLATION_TYPE read_interp_filter_type( + struct vp9_read_bit_buffer *rb) { + const INTERPOLATION_TYPE literal_to_type[] = { EIGHTTAP_SMOOTH, + EIGHTTAP, + EIGHTTAP_SHARP, + BILINEAR }; + return vp9_rb_read_bit(rb) ? SWITCHABLE + : literal_to_type[vp9_rb_read_literal(rb, 2)]; +} + +static void read_frame_size(struct vp9_read_bit_buffer *rb, + int *width, int *height) { + const int w = vp9_rb_read_literal(rb, 16) + 1; + const int h = vp9_rb_read_literal(rb, 16) + 1; + *width = w; + *height = h; +} + +static void setup_display_size(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) { + cm->display_width = cm->width; + cm->display_height = cm->height; + if (vp9_rb_read_bit(rb)) + read_frame_size(rb, &cm->display_width, &cm->display_height); +} + +static void apply_frame_size(VP9D_COMP *pbi, int width, int height) { + VP9_COMMON *cm = &pbi->common; + + if (cm->width != width || cm->height != height) { + // Change in frame size. + // TODO(agrange) Don't test width/height, check overall size. + if (width > cm->width || height > cm->height) { + // Rescale frame buffers only if they're not big enough already. + if (vp9_resize_frame_buffers(cm, width, height)) + vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR, + "Failed to allocate frame buffers"); + } + + cm->width = width; + cm->height = height; + + vp9_update_frame_size(cm); + } + + if (cm->fb_list != NULL) { + vpx_codec_frame_buffer_t *const ext_fb = &cm->fb_list[cm->new_fb_idx]; + if (vp9_realloc_frame_buffer(get_frame_new_buffer(cm), + cm->width, cm->height, + cm->subsampling_x, cm->subsampling_y, + VP9BORDERINPIXELS, ext_fb, + cm->realloc_fb_cb, cm->user_priv)) { + vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR, + "Failed to allocate external frame buffer"); + } + } else { + vp9_realloc_frame_buffer(get_frame_new_buffer(cm), cm->width, cm->height, + cm->subsampling_x, cm->subsampling_y, + VP9BORDERINPIXELS, NULL, NULL, NULL); + } +} + +static void setup_frame_size(VP9D_COMP *pbi, + struct vp9_read_bit_buffer *rb) { + int width, height; + read_frame_size(rb, &width, &height); + apply_frame_size(pbi, width, height); + setup_display_size(&pbi->common, rb); +} + +static void setup_frame_size_with_refs(VP9D_COMP *pbi, + struct vp9_read_bit_buffer *rb) { + VP9_COMMON *const cm = &pbi->common; + + int width, height; + int found = 0, i; + for (i = 0; i < REFS_PER_FRAME; ++i) { + if (vp9_rb_read_bit(rb)) { + YV12_BUFFER_CONFIG *const cfg = get_frame_ref_buffer(cm, i); + width = cfg->y_crop_width; + height = cfg->y_crop_height; + found = 1; + break; + } + } + + if (!found) + read_frame_size(rb, &width, &height); + + if (!width || !height) + vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, + "Referenced frame with invalid size"); + + apply_frame_size(pbi, width, height); + setup_display_size(cm, rb); +} + +static void setup_tile_context(VP9D_COMP *const pbi, MACROBLOCKD *const xd, + int tile_row, int tile_col) { + int i; + const int tile_cols = 1 << pbi->common.log2_tile_cols; + xd->mi_stream = pbi->mi_streams[tile_row * tile_cols + tile_col]; + + for (i = 0; i < MAX_MB_PLANE; ++i) { + xd->above_context[i] = pbi->above_context[i]; + } + // see note in alloc_tile_storage(). + xd->above_seg_context = pbi->above_seg_context; +} + +static void decode_tile(VP9D_COMP *pbi, const TileInfo *const tile, + vp9_reader *r) { + const int num_threads = pbi->oxcf.max_threads; + VP9_COMMON *const cm = &pbi->common; + int mi_row, mi_col; + MACROBLOCKD *xd = &pbi->mb; + + if (pbi->do_loopfilter_inline) { + LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1; + lf_data->frame_buffer = get_frame_new_buffer(cm); + lf_data->cm = cm; + lf_data->xd = pbi->mb; + lf_data->stop = 0; + lf_data->y_only = 0; + vp9_loop_filter_frame_init(cm, cm->lf.filter_level); + } + + for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end; + mi_row += MI_BLOCK_SIZE) { + // For a SB there are 2 left contexts, each pertaining to a MB row within + vp9_zero(xd->left_context); + vp9_zero(xd->left_seg_context); + for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end; + mi_col += MI_BLOCK_SIZE) { + decode_modes_sb(cm, xd, tile, mi_row, mi_col, r, BLOCK_64X64); + } + + if (pbi->do_loopfilter_inline) { + const int lf_start = mi_row - MI_BLOCK_SIZE; + LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1; + + // delay the loopfilter by 1 macroblock row. + if (lf_start < 0) continue; + + // decoding has completed: finish up the loop filter in this thread. + if (mi_row + MI_BLOCK_SIZE >= tile->mi_row_end) continue; + + vp9_worker_sync(&pbi->lf_worker); + lf_data->start = lf_start; + lf_data->stop = mi_row; + if (num_threads > 1) { + vp9_worker_launch(&pbi->lf_worker); + } else { + vp9_worker_execute(&pbi->lf_worker); + } + } + } + + if (pbi->do_loopfilter_inline) { + LFWorkerData *const lf_data = (LFWorkerData*)pbi->lf_worker.data1; + + vp9_worker_sync(&pbi->lf_worker); + lf_data->start = lf_data->stop; + lf_data->stop = cm->mi_rows; + vp9_worker_execute(&pbi->lf_worker); + } +} + +static void setup_tile_info(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) { + int min_log2_tile_cols, max_log2_tile_cols, max_ones; + vp9_get_tile_n_bits(cm->mi_cols, &min_log2_tile_cols, &max_log2_tile_cols); + + // columns + max_ones = max_log2_tile_cols - min_log2_tile_cols; + cm->log2_tile_cols = min_log2_tile_cols; + while (max_ones-- && vp9_rb_read_bit(rb)) + cm->log2_tile_cols++; + + // rows + cm->log2_tile_rows = vp9_rb_read_bit(rb); + if (cm->log2_tile_rows) + cm->log2_tile_rows += vp9_rb_read_bit(rb); +} + +// Reads the next tile returning its size and adjusting '*data' accordingly +// based on 'is_last'. +static size_t get_tile(const uint8_t *const data_end, + int is_last, + struct vpx_internal_error_info *error_info, + const uint8_t **data) { + size_t size; + + if (!is_last) { + if (!read_is_valid(*data, 4, data_end)) + vpx_internal_error(error_info, VPX_CODEC_CORRUPT_FRAME, + "Truncated packet or corrupt tile length"); + + size = read_be32(*data); + *data += 4; + } else { + size = data_end - *data; + } + return size; +} + +typedef struct TileBuffer { + const uint8_t *data; + size_t size; + int col; // only used with multi-threaded decoding +} TileBuffer; + +static const uint8_t *decode_tiles(VP9D_COMP *pbi, const uint8_t *data) { + VP9_COMMON *const cm = &pbi->common; + MACROBLOCKD *const xd = &pbi->mb; + const int aligned_cols = mi_cols_aligned_to_sb(cm->mi_cols); + const int tile_cols = 1 << cm->log2_tile_cols; + const int tile_rows = 1 << cm->log2_tile_rows; + TileBuffer tile_buffers[4][1 << 6]; + int tile_row, tile_col; + const uint8_t *const data_end = pbi->source + pbi->source_sz; + const uint8_t *end = NULL; + vp9_reader r; + + assert(tile_rows <= 4); + assert(tile_cols <= (1 << 6)); + + // Note: this memset assumes above_context[0], [1] and [2] + // are allocated as part of the same buffer. + vpx_memset(pbi->above_context[0], 0, + sizeof(*pbi->above_context[0]) * MAX_MB_PLANE * 2 * aligned_cols); + + vpx_memset(pbi->above_seg_context, 0, + sizeof(*pbi->above_seg_context) * aligned_cols); + + // Load tile data into tile_buffers + for (tile_row = 0; tile_row < tile_rows; ++tile_row) { + for (tile_col = 0; tile_col < tile_cols; ++tile_col) { + const int last_tile = tile_row == tile_rows - 1 && + tile_col == tile_cols - 1; + const size_t size = get_tile(data_end, last_tile, &cm->error, &data); + TileBuffer *const buf = &tile_buffers[tile_row][tile_col]; + buf->data = data; + buf->size = size; + data += size; + } + } + + // Decode tiles using data from tile_buffers + for (tile_row = 0; tile_row < tile_rows; ++tile_row) { + for (tile_col = 0; tile_col < tile_cols; ++tile_col) { + const int col = pbi->oxcf.inv_tile_order ? tile_cols - tile_col - 1 + : tile_col; + const int last_tile = tile_row == tile_rows - 1 && + col == tile_cols - 1; + const TileBuffer *const buf = &tile_buffers[tile_row][col]; + TileInfo tile; + + vp9_tile_init(&tile, cm, tile_row, col); + setup_token_decoder(buf->data, data_end, buf->size, &cm->error, &r); + setup_tile_context(pbi, xd, tile_row, col); + decode_tile(pbi, &tile, &r); + + if (last_tile) + end = vp9_reader_find_end(&r); + } + } + + return end; +} + +static void setup_tile_macroblockd(TileWorkerData *const tile_data) { + MACROBLOCKD *xd = &tile_data->xd; + struct macroblockd_plane *const pd = xd->plane; + int i; + + for (i = 0; i < MAX_MB_PLANE; ++i) { + pd[i].dqcoeff = tile_data->dqcoeff[i]; + vpx_memset(xd->plane[i].dqcoeff, 0, 64 * 64 * sizeof(int16_t)); + } +} + +static int tile_worker_hook(void *arg1, void *arg2) { + TileWorkerData *const tile_data = (TileWorkerData*)arg1; + const TileInfo *const tile = (TileInfo*)arg2; + int mi_row, mi_col; + + for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end; + mi_row += MI_BLOCK_SIZE) { + vp9_zero(tile_data->xd.left_context); + vp9_zero(tile_data->xd.left_seg_context); + for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end; + mi_col += MI_BLOCK_SIZE) { + decode_modes_sb(tile_data->cm, &tile_data->xd, tile, + mi_row, mi_col, &tile_data->bit_reader, BLOCK_64X64); + } + } + return !tile_data->xd.corrupted; +} + +// sorts in descending order +static int compare_tile_buffers(const void *a, const void *b) { + const TileBuffer *const buf1 = (const TileBuffer*)a; + const TileBuffer *const buf2 = (const TileBuffer*)b; + if (buf1->size < buf2->size) { + return 1; + } else if (buf1->size == buf2->size) { + return 0; + } else { + return -1; + } +} + +static const uint8_t *decode_tiles_mt(VP9D_COMP *pbi, const uint8_t *data) { + VP9_COMMON *const cm = &pbi->common; + const uint8_t *bit_reader_end = NULL; + const uint8_t *const data_end = pbi->source + pbi->source_sz; + const int aligned_mi_cols = mi_cols_aligned_to_sb(cm->mi_cols); + const int tile_cols = 1 << cm->log2_tile_cols; + const int tile_rows = 1 << cm->log2_tile_rows; + const int num_workers = MIN(pbi->oxcf.max_threads & ~1, tile_cols); + TileBuffer tile_buffers[1 << 6]; + int n; + int final_worker = -1; + + assert(tile_cols <= (1 << 6)); + assert(tile_rows == 1); + (void)tile_rows; + + if (num_workers > pbi->num_tile_workers) { + int i; + CHECK_MEM_ERROR(cm, pbi->tile_workers, + vpx_realloc(pbi->tile_workers, + num_workers * sizeof(*pbi->tile_workers))); + for (i = pbi->num_tile_workers; i < num_workers; ++i) { + VP9Worker *const worker = &pbi->tile_workers[i]; + ++pbi->num_tile_workers; + + vp9_worker_init(worker); + worker->hook = (VP9WorkerHook)tile_worker_hook; + CHECK_MEM_ERROR(cm, worker->data1, + vpx_memalign(32, sizeof(TileWorkerData))); + CHECK_MEM_ERROR(cm, worker->data2, vpx_malloc(sizeof(TileInfo))); + if (i < num_workers - 1 && !vp9_worker_reset(worker)) { + vpx_internal_error(&cm->error, VPX_CODEC_ERROR, + "Tile decoder thread creation failed"); + } + } + } + + // Note: this memset assumes above_context[0], [1] and [2] + // are allocated as part of the same buffer. + vpx_memset(pbi->above_context[0], 0, + sizeof(*pbi->above_context[0]) * MAX_MB_PLANE * + 2 * aligned_mi_cols); + vpx_memset(pbi->above_seg_context, 0, + sizeof(*pbi->above_seg_context) * aligned_mi_cols); + + // Load tile data into tile_buffers + for (n = 0; n < tile_cols; ++n) { + const size_t size = + get_tile(data_end, n == tile_cols - 1, &cm->error, &data); + TileBuffer *const buf = &tile_buffers[n]; + buf->data = data; + buf->size = size; + buf->col = n; + data += size; + } + + // Sort the buffers based on size in descending order. + qsort(tile_buffers, tile_cols, sizeof(tile_buffers[0]), compare_tile_buffers); + + // Rearrange the tile buffers such that per-tile group the largest, and + // presumably the most difficult, tile will be decoded in the main thread. + // This should help minimize the number of instances where the main thread is + // waiting for a worker to complete. + { + int group_start = 0; + while (group_start < tile_cols) { + const TileBuffer largest = tile_buffers[group_start]; + const int group_end = MIN(group_start + num_workers, tile_cols) - 1; + memmove(tile_buffers + group_start, tile_buffers + group_start + 1, + (group_end - group_start) * sizeof(tile_buffers[0])); + tile_buffers[group_end] = largest; + group_start = group_end + 1; + } + } + + n = 0; + while (n < tile_cols) { + int i; + for (i = 0; i < num_workers && n < tile_cols; ++i) { + VP9Worker *const worker = &pbi->tile_workers[i]; + TileWorkerData *const tile_data = (TileWorkerData*)worker->data1; + TileInfo *const tile = (TileInfo*)worker->data2; + TileBuffer *const buf = &tile_buffers[n]; + + tile_data->cm = cm; + tile_data->xd = pbi->mb; + tile_data->xd.corrupted = 0; + vp9_tile_init(tile, tile_data->cm, 0, buf->col); + + setup_token_decoder(buf->data, data_end, buf->size, &cm->error, + &tile_data->bit_reader); + setup_tile_context(pbi, &tile_data->xd, 0, buf->col); + setup_tile_macroblockd(tile_data); + + worker->had_error = 0; + if (i == num_workers - 1 || n == tile_cols - 1) { + vp9_worker_execute(worker); + } else { + vp9_worker_launch(worker); + } + + if (buf->col == tile_cols - 1) { + final_worker = i; + } + + ++n; + } + + for (; i > 0; --i) { + VP9Worker *const worker = &pbi->tile_workers[i - 1]; + pbi->mb.corrupted |= !vp9_worker_sync(worker); + } + if (final_worker > -1) { + TileWorkerData *const tile_data = + (TileWorkerData*)pbi->tile_workers[final_worker].data1; + bit_reader_end = vp9_reader_find_end(&tile_data->bit_reader); + final_worker = -1; + } + } + + return bit_reader_end; +} + +static void check_sync_code(VP9_COMMON *cm, struct vp9_read_bit_buffer *rb) { + if (vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_0 || + vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_1 || + vp9_rb_read_literal(rb, 8) != VP9_SYNC_CODE_2) { + vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, + "Invalid frame sync code"); + } +} + +static void error_handler(void *data, size_t bit_offset) { + VP9_COMMON *const cm = (VP9_COMMON *)data; + vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, "Truncated packet"); +} + +#define RESERVED \ + if (vp9_rb_read_bit(rb)) \ + vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, \ + "Reserved bit must be unset") + +static size_t read_uncompressed_header(VP9D_COMP *pbi, + struct vp9_read_bit_buffer *rb) { + VP9_COMMON *const cm = &pbi->common; + size_t sz; + int i; + + cm->last_frame_type = cm->frame_type; + + if (vp9_rb_read_literal(rb, 2) != VP9_FRAME_MARKER) + vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, + "Invalid frame marker"); + + cm->version = vp9_rb_read_bit(rb); + RESERVED; + + if (vp9_rb_read_bit(rb)) { + // show an existing frame directly + int frame_to_show = cm->ref_frame_map[vp9_rb_read_literal(rb, 3)]; + ref_cnt_fb(cm->fb_idx_ref_cnt, &cm->new_fb_idx, frame_to_show); + pbi->refresh_frame_flags = 0; + cm->lf.filter_level = 0; + return 0; + } + + cm->frame_type = (FRAME_TYPE) vp9_rb_read_bit(rb); + cm->show_frame = vp9_rb_read_bit(rb); + cm->error_resilient_mode = vp9_rb_read_bit(rb); + + if (cm->frame_type == KEY_FRAME) { + check_sync_code(cm, rb); + + cm->color_space = vp9_rb_read_literal(rb, 3); // colorspace + if (cm->color_space != SRGB) { + vp9_rb_read_bit(rb); // [16,235] (including xvycc) vs [0,255] range + if (cm->version == 1) { + cm->subsampling_x = vp9_rb_read_bit(rb); + cm->subsampling_y = vp9_rb_read_bit(rb); + vp9_rb_read_bit(rb); // has extra plane + } else { + cm->subsampling_y = cm->subsampling_x = 1; + } + } else { + if (cm->version == 1) { + cm->subsampling_y = cm->subsampling_x = 0; + vp9_rb_read_bit(rb); // has extra plane + } else { + vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM, + "RGB not supported in profile 0"); + } + } + + pbi->refresh_frame_flags = (1 << REF_FRAMES) - 1; + + for (i = 0; i < REFS_PER_FRAME; ++i) + cm->active_ref_idx[i] = cm->new_fb_idx; + + setup_frame_size(pbi, rb); + } else { + cm->intra_only = cm->show_frame ? 0 : vp9_rb_read_bit(rb); + + cm->reset_frame_context = cm->error_resilient_mode ? + 0 : vp9_rb_read_literal(rb, 2); + + if (cm->intra_only) { + check_sync_code(cm, rb); + + pbi->refresh_frame_flags = vp9_rb_read_literal(rb, REF_FRAMES); + setup_frame_size(pbi, rb); + } else { + pbi->refresh_frame_flags = vp9_rb_read_literal(rb, REF_FRAMES); + + for (i = 0; i < REFS_PER_FRAME; ++i) { + const int ref = vp9_rb_read_literal(rb, REF_FRAMES_LOG2); + cm->active_ref_idx[i] = cm->ref_frame_map[ref]; + cm->ref_frame_sign_bias[LAST_FRAME + i] = vp9_rb_read_bit(rb); + } + + setup_frame_size_with_refs(pbi, rb); + + cm->allow_high_precision_mv = vp9_rb_read_bit(rb); + cm->mcomp_filter_type = read_interp_filter_type(rb); + + for (i = 0; i < REFS_PER_FRAME; ++i) { + vp9_setup_scale_factors(cm, i); + if (vp9_is_scaled(&cm->active_ref_scale_comm[i])) + vp9_extend_frame_borders(&cm->yv12_fb[cm->active_ref_idx[i]], + cm->subsampling_x, cm->subsampling_y); + } + } + } + + if (!cm->error_resilient_mode) { + cm->refresh_frame_context = vp9_rb_read_bit(rb); + cm->frame_parallel_decoding_mode = vp9_rb_read_bit(rb); + } else { + cm->refresh_frame_context = 0; + cm->frame_parallel_decoding_mode = 1; + } + + // This flag will be overridden by the call to vp9_setup_past_independence + // below, forcing the use of context 0 for those frame types. + cm->frame_context_idx = vp9_rb_read_literal(rb, FRAME_CONTEXTS_LOG2); + + if (frame_is_intra_only(cm) || cm->error_resilient_mode) + vp9_setup_past_independence(cm); + + setup_loopfilter(&cm->lf, rb); + setup_quantization(cm, &pbi->mb, rb); + setup_segmentation(&cm->seg, rb); + + setup_tile_info(cm, rb); + sz = vp9_rb_read_literal(rb, 16); + + if (sz == 0) + vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, + "Invalid header size"); + + return sz; +} + +static int read_compressed_header(VP9D_COMP *pbi, const uint8_t *data, + size_t partition_size) { + VP9_COMMON *const cm = &pbi->common; + MACROBLOCKD *const xd = &pbi->mb; + FRAME_CONTEXT *const fc = &cm->fc; + vp9_reader r; + int k; + + if (vp9_reader_init(&r, data, partition_size)) + vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR, + "Failed to allocate bool decoder 0"); + + cm->tx_mode = xd->lossless ? ONLY_4X4 : read_tx_mode(&r); + if (cm->tx_mode == TX_MODE_SELECT) + read_tx_mode_probs(&fc->tx_probs, &r); + read_coef_probs(fc, cm->tx_mode, &r); + + for (k = 0; k < MBSKIP_CONTEXTS; ++k) + vp9_diff_update_prob(&r, &fc->mbskip_probs[k]); + + if (!frame_is_intra_only(cm)) { + nmv_context *const nmvc = &fc->nmvc; + int i, j; + + read_inter_mode_probs(fc, &r); + + if (cm->mcomp_filter_type == SWITCHABLE) + read_switchable_interp_probs(fc, &r); + + for (i = 0; i < INTRA_INTER_CONTEXTS; i++) + vp9_diff_update_prob(&r, &fc->intra_inter_prob[i]); + + cm->reference_mode = read_reference_mode(cm, &r); + read_reference_mode_probs(cm, &r); + + for (j = 0; j < BLOCK_SIZE_GROUPS; j++) + for (i = 0; i < INTRA_MODES - 1; ++i) + vp9_diff_update_prob(&r, &fc->y_mode_prob[j][i]); + + for (j = 0; j < PARTITION_CONTEXTS; ++j) + for (i = 0; i < PARTITION_TYPES - 1; ++i) + vp9_diff_update_prob(&r, &fc->partition_prob[j][i]); + + read_mv_probs(nmvc, cm->allow_high_precision_mv, &r); + } + + return vp9_reader_has_error(&r); +} + +void vp9_init_dequantizer(VP9_COMMON *cm) { + int q; + + for (q = 0; q < QINDEX_RANGE; q++) { + cm->y_dequant[q][0] = vp9_dc_quant(q, cm->y_dc_delta_q); + cm->y_dequant[q][1] = vp9_ac_quant(q, 0); + + cm->uv_dequant[q][0] = vp9_dc_quant(q, cm->uv_dc_delta_q); + cm->uv_dequant[q][1] = vp9_ac_quant(q, cm->uv_ac_delta_q); + } +} + +#ifdef NDEBUG +#define debug_check_frame_counts(cm) (void)0 +#else // !NDEBUG +// Counts should only be incremented when frame_parallel_decoding_mode and +// error_resilient_mode are disabled. +static void debug_check_frame_counts(const VP9_COMMON *const cm) { + FRAME_COUNTS zero_counts; + vp9_zero(zero_counts); + assert(cm->frame_parallel_decoding_mode || cm->error_resilient_mode); + assert(!memcmp(cm->counts.y_mode, zero_counts.y_mode, + sizeof(cm->counts.y_mode))); + assert(!memcmp(cm->counts.uv_mode, zero_counts.uv_mode, + sizeof(cm->counts.uv_mode))); + assert(!memcmp(cm->counts.partition, zero_counts.partition, + sizeof(cm->counts.partition))); + assert(!memcmp(cm->counts.coef, zero_counts.coef, + sizeof(cm->counts.coef))); + assert(!memcmp(cm->counts.eob_branch, zero_counts.eob_branch, + sizeof(cm->counts.eob_branch))); + assert(!memcmp(cm->counts.switchable_interp, zero_counts.switchable_interp, + sizeof(cm->counts.switchable_interp))); + assert(!memcmp(cm->counts.inter_mode, zero_counts.inter_mode, + sizeof(cm->counts.inter_mode))); + assert(!memcmp(cm->counts.intra_inter, zero_counts.intra_inter, + sizeof(cm->counts.intra_inter))); + assert(!memcmp(cm->counts.comp_inter, zero_counts.comp_inter, + sizeof(cm->counts.comp_inter))); + assert(!memcmp(cm->counts.single_ref, zero_counts.single_ref, + sizeof(cm->counts.single_ref))); + assert(!memcmp(cm->counts.comp_ref, zero_counts.comp_ref, + sizeof(cm->counts.comp_ref))); + assert(!memcmp(&cm->counts.tx, &zero_counts.tx, sizeof(cm->counts.tx))); + assert(!memcmp(cm->counts.mbskip, zero_counts.mbskip, + sizeof(cm->counts.mbskip))); + assert(!memcmp(&cm->counts.mv, &zero_counts.mv, sizeof(cm->counts.mv))); +} +#endif // NDEBUG + +int vp9_decode_frame(VP9D_COMP *pbi, const uint8_t **p_data_end) { + int i; + VP9_COMMON *const cm = &pbi->common; + MACROBLOCKD *const xd = &pbi->mb; + + const uint8_t *data = pbi->source; + const uint8_t *const data_end = pbi->source + pbi->source_sz; + + struct vp9_read_bit_buffer rb = { data, data_end, 0, cm, error_handler }; + const size_t first_partition_size = read_uncompressed_header(pbi, &rb); + const int keyframe = cm->frame_type == KEY_FRAME; + const int tile_rows = 1 << cm->log2_tile_rows; + const int tile_cols = 1 << cm->log2_tile_cols; + YV12_BUFFER_CONFIG *const new_fb = get_frame_new_buffer(cm); + + if (!first_partition_size) { + // showing a frame directly + *p_data_end = data + 1; + return 0; + } + + if (!pbi->decoded_key_frame && !keyframe) + return -1; + + data += vp9_rb_bytes_read(&rb); + if (!read_is_valid(data, first_partition_size, data_end)) + vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, + "Truncated packet or corrupt header length"); + + pbi->do_loopfilter_inline = + (cm->log2_tile_rows | cm->log2_tile_cols) == 0 && cm->lf.filter_level; + if (pbi->do_loopfilter_inline && pbi->lf_worker.data1 == NULL) { + CHECK_MEM_ERROR(cm, pbi->lf_worker.data1, vpx_malloc(sizeof(LFWorkerData))); + pbi->lf_worker.hook = (VP9WorkerHook)vp9_loop_filter_worker; + if (pbi->oxcf.max_threads > 1 && !vp9_worker_reset(&pbi->lf_worker)) { + vpx_internal_error(&cm->error, VPX_CODEC_ERROR, + "Loop filter thread creation failed"); + } + } + + alloc_tile_storage(pbi, tile_rows, tile_cols); + + xd->mode_info_stride = cm->mode_info_stride; + set_prev_mi(cm); + + setup_plane_dequants(cm, xd, cm->base_qindex); + setup_block_dptrs(xd, cm->subsampling_x, cm->subsampling_y); + + cm->fc = cm->frame_contexts[cm->frame_context_idx]; + vp9_zero(cm->counts); + for (i = 0; i < MAX_MB_PLANE; ++i) + vpx_memset(xd->plane[i].dqcoeff, 0, 64 * 64 * sizeof(int16_t)); + + xd->corrupted = 0; + new_fb->corrupted = read_compressed_header(pbi, data, first_partition_size); + + // TODO(jzern): remove frame_parallel_decoding_mode restriction for + // single-frame tile decoding. + if (pbi->oxcf.max_threads > 1 && tile_rows == 1 && tile_cols > 1 && + cm->frame_parallel_decoding_mode) { + *p_data_end = decode_tiles_mt(pbi, data + first_partition_size); + } else { + *p_data_end = decode_tiles(pbi, data + first_partition_size); + } + + cm->last_width = cm->width; + cm->last_height = cm->height; + + new_fb->corrupted |= xd->corrupted; + + if (!pbi->decoded_key_frame) { + if (keyframe && !new_fb->corrupted) + pbi->decoded_key_frame = 1; + else + vpx_internal_error(&cm->error, VPX_CODEC_CORRUPT_FRAME, + "A stream must start with a complete key frame"); + } + + if (!cm->error_resilient_mode && !cm->frame_parallel_decoding_mode) { + vp9_adapt_coef_probs(cm); + + if (!frame_is_intra_only(cm)) { + vp9_adapt_mode_probs(cm); + vp9_adapt_mv_probs(cm, cm->allow_high_precision_mv); + } + } else { + debug_check_frame_counts(cm); + } + + if (cm->refresh_frame_context) + cm->frame_contexts[cm->frame_context_idx] = cm->fc; + + return 0; +} |