libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_alloccommon.c

+/*
+ *  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 "vpx_ports/config.h"
+#include "vp9/common/vp9_blockd.h"
+#include "vpx_mem/vpx_mem.h"
+#include "vp9/common/vp9_onyxc_int.h"
+#include "vp9/common/vp9_findnearmv.h"
+#include "vp9/common/vp9_entropymode.h"
+#include "vp9/common/vp9_entropymv.h"
+#include "vp9/common/vp9_systemdependent.h"
+
+
+void vp9_update_mode_info_border(VP9_COMMON *cpi, MODE_INFO *mi_base) {
+  int stride = cpi->mode_info_stride;
+  int i;
+
+  // Clear down top border row
+  vpx_memset(mi_base, 0, sizeof(MODE_INFO) * cpi->mode_info_stride);
+
+  // Clear left border column
+  for (i = 1; i < cpi->mb_rows + 1; i++) {
+    vpx_memset(&mi_base[i * stride], 0, sizeof(MODE_INFO));
+  }
+}
+
+void vp9_update_mode_info_in_image(VP9_COMMON *cpi, MODE_INFO *mi) {
+  int i, j;
+
+  // For each in image mode_info element set the in image flag to 1
+  for (i = 0; i < cpi->mb_rows; i++) {
+    for (j = 0; j < cpi->mb_cols; j++) {
+      mi->mbmi.mb_in_image = 1;
+      mi++;   // Next element in the row
+    }
+
+    mi++;       // Step over border element at start of next row
+  }
+}
+
+void vp9_de_alloc_frame_buffers(VP9_COMMON *oci) {
+  int i;
+
+  for (i = 0; i < NUM_YV12_BUFFERS; i++)
+    vp8_yv12_de_alloc_frame_buffer(&oci->yv12_fb[i]);
+
+  vp8_yv12_de_alloc_frame_buffer(&oci->temp_scale_frame);
+  vp8_yv12_de_alloc_frame_buffer(&oci->post_proc_buffer);
+
+  vpx_free(oci->above_context);
+  vpx_free(oci->mip);
+  vpx_free(oci->prev_mip);
+
+  oci->above_context = 0;
+  oci->mip = 0;
+  oci->prev_mip = 0;
+
+}
+
+int vp9_alloc_frame_buffers(VP9_COMMON *oci, int width, int height) {
+  int i;
+
+  vp9_de_alloc_frame_buffers(oci);
+
+  /* our internal buffers are always multiples of 16 */
+  if ((width & 0xf) != 0)
+    width += 16 - (width & 0xf);
+
+  if ((height & 0xf) != 0)
+    height += 16 - (height & 0xf);
+
+
+  for (i = 0; i < NUM_YV12_BUFFERS; i++) {
+    oci->fb_idx_ref_cnt[i] = 0;
+    oci->yv12_fb[i].flags = 0;
+    if (vp8_yv12_alloc_frame_buffer(&oci->yv12_fb[i], width, height,
+                                    VP9BORDERINPIXELS) < 0) {
+      vp9_de_alloc_frame_buffers(oci);
+      return 1;
+    }
+  }
+
+  oci->new_fb_idx = 0;
+  oci->lst_fb_idx = 1;
+  oci->gld_fb_idx = 2;
+  oci->alt_fb_idx = 3;
+
+  oci->fb_idx_ref_cnt[0] = 1;
+  oci->fb_idx_ref_cnt[1] = 1;
+  oci->fb_idx_ref_cnt[2] = 1;
+  oci->fb_idx_ref_cnt[3] = 1;
+
+  if (vp8_yv12_alloc_frame_buffer(&oci->temp_scale_frame, width, 16,
+                                  VP9BORDERINPIXELS) < 0) {
+    vp9_de_alloc_frame_buffers(oci);
+    return 1;
+  }
+
+  if (vp8_yv12_alloc_frame_buffer(&oci->post_proc_buffer, width, height,
+                                  VP9BORDERINPIXELS) < 0) {
+    vp9_de_alloc_frame_buffers(oci);
+    return 1;
+  }
+
+  oci->mb_rows = height >> 4;
+  oci->mb_cols = width >> 4;
+  oci->MBs = oci->mb_rows * oci->mb_cols;
+  oci->mode_info_stride = oci->mb_cols + 1;
+  oci->mip = vpx_calloc((oci->mb_cols + 1) * (oci->mb_rows + 1), sizeof(MODE_INFO));
+
+  if (!oci->mip) {
+    vp9_de_alloc_frame_buffers(oci);
+    return 1;
+  }
+
+  oci->mi = oci->mip + oci->mode_info_stride + 1;
+
+  /* allocate memory for last frame MODE_INFO array */
+
+  oci->prev_mip = vpx_calloc((oci->mb_cols + 1) * (oci->mb_rows + 1), sizeof(MODE_INFO));
+
+  if (!oci->prev_mip) {
+    vp9_de_alloc_frame_buffers(oci);
+    return 1;
+  }
+
+  oci->prev_mi = oci->prev_mip + oci->mode_info_stride + 1;
+
+  oci->above_context = vpx_calloc(sizeof(ENTROPY_CONTEXT_PLANES) * oci->mb_cols, 1);
+
+  if (!oci->above_context) {
+    vp9_de_alloc_frame_buffers(oci);
+    return 1;
+  }
+
+  vp9_update_mode_info_border(oci, oci->mip);
+  vp9_update_mode_info_in_image(oci, oci->mi);
+
+  return 0;
+}
+void vp9_setup_version(VP9_COMMON *cm) {
+  if (cm->version & 0x4) {
+    if (!CONFIG_EXPERIMENTAL)
+      vpx_internal_error(&cm->error, VPX_CODEC_UNSUP_BITSTREAM,
+                         "Bitstream was created by an experimental "
+                         "encoder");
+    cm->experimental = 1;
+  }
+
+  switch (cm->version & 0x3) {
+    case 0:
+      cm->no_lpf = 0;
+      cm->filter_type = NORMAL_LOOPFILTER;
+      cm->use_bilinear_mc_filter = 0;
+      cm->full_pixel = 0;
+      break;
+    case 1:
+      cm->no_lpf = 0;
+      cm->filter_type = SIMPLE_LOOPFILTER;
+      cm->use_bilinear_mc_filter = 1;
+      cm->full_pixel = 0;
+      break;
+    case 2:
+    case 3:
+      cm->no_lpf = 1;
+      cm->filter_type = NORMAL_LOOPFILTER;
+      cm->use_bilinear_mc_filter = 1;
+      cm->full_pixel = 0;
+      break;
+      // Full pel only code deprecated in experimental code base
+      // case 3:
+      //    cm->no_lpf = 1;
+      //    cm->filter_type = SIMPLE_LOOPFILTER;
+      //    cm->use_bilinear_mc_filter = 1;
+      //    cm->full_pixel = 1;
+      //    break;
+  }
+}
+void vp9_create_common(VP9_COMMON *oci) {
+  vp9_machine_specific_config(oci);
+
+  vp9_init_mbmode_probs(oci);
+
+  vp9_default_bmode_probs(oci->fc.bmode_prob);
+
+  oci->txfm_mode = ONLY_4X4;
+  oci->mb_no_coeff_skip = 1;
+  oci->comp_pred_mode = HYBRID_PREDICTION;
+  oci->no_lpf = 0;
+  oci->filter_type = NORMAL_LOOPFILTER;
+  oci->use_bilinear_mc_filter = 0;
+  oci->full_pixel = 0;
+  oci->clr_type = REG_YUV;
+  oci->clamp_type = RECON_CLAMP_REQUIRED;
+
+  /* Initialise reference frame sign bias structure to defaults */
+  vpx_memset(oci->ref_frame_sign_bias, 0, sizeof(oci->ref_frame_sign_bias));
+
+  /* Default disable buffer to buffer copying */
+  oci->copy_buffer_to_gf = 0;
+  oci->copy_buffer_to_arf = 0;
+  oci->kf_ymode_probs_update = 0;
+}
+
+void vp9_remove_common(VP9_COMMON *oci) {
+  vp9_de_alloc_frame_buffers(oci);
+}
+
+void vp9_initialize_common() {
+  vp9_coef_tree_initialize();
+
+  vp9_entropy_mode_init();
+
+  vp9_entropy_mv_init();
+}