1 files changed, 86 insertions, 0 deletions
diff --git a/webrtc/modules/audio_processing/aec3/block_framer.cc b/webrtc/modules/audio_processing/aec3/block_framer.cc
new file mode 100644
index 0000000..8241ce6
--- /dev/null
+++ b/webrtc/modules/audio_processing/aec3/block_framer.cc
@@ -0,0 +1,86 @@
+/*
+ *  Copyright (c) 2016 The WebRTC 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 "modules/audio_processing/aec3/block_framer.h"
+
+#include <algorithm>
+
+#include "modules/audio_processing/aec3/aec3_common.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+BlockFramer::BlockFramer(size_t num_bands, size_t num_channels)
+    : num_bands_(num_bands),
+      num_channels_(num_channels),
+      buffer_(num_bands_,
+              std::vector<std::vector<float>>(
+                  num_channels,
+                  std::vector<float>(kBlockSize, 0.f))) {
+  RTC_DCHECK_LT(0, num_bands);
+  RTC_DCHECK_LT(0, num_channels);
+}
+
+BlockFramer::~BlockFramer() = default;
+
+// All the constants are chosen so that the buffer is either empty or has enough
+// samples for InsertBlockAndExtractSubFrame to produce a frame. In order to
+// achieve this, the InsertBlockAndExtractSubFrame and InsertBlock methods need
+// to be called in the correct order.
+void BlockFramer::InsertBlock(
+    const std::vector<std::vector<std::vector<float>>>& block) {
+  RTC_DCHECK_EQ(num_bands_, block.size());
+  for (size_t band = 0; band < num_bands_; ++band) {
+    RTC_DCHECK_EQ(num_channels_, block[band].size());
+    for (size_t channel = 0; channel < num_channels_; ++channel) {
+      RTC_DCHECK_EQ(kBlockSize, block[band][channel].size());
+      RTC_DCHECK_EQ(0, buffer_[band][channel].size());
+
+      buffer_[band][channel].insert(buffer_[band][channel].begin(),
+                                    block[band][channel].begin(),
+                                    block[band][channel].end());
+    }
+  }
+}
+
+void BlockFramer::InsertBlockAndExtractSubFrame(
+    const std::vector<std::vector<std::vector<float>>>& block,
+    std::vector<std::vector<rtc::ArrayView<float>>>* sub_frame) {
+  RTC_DCHECK(sub_frame);
+  RTC_DCHECK_EQ(num_bands_, block.size());
+  RTC_DCHECK_EQ(num_bands_, sub_frame->size());
+  for (size_t band = 0; band < num_bands_; ++band) {
+    RTC_DCHECK_EQ(num_channels_, block[band].size());
+    RTC_DCHECK_EQ(num_channels_, (*sub_frame)[0].size());
+    for (size_t channel = 0; channel < num_channels_; ++channel) {
+      RTC_DCHECK_LE(kSubFrameLength,
+                    buffer_[band][channel].size() + kBlockSize);
+      RTC_DCHECK_EQ(kBlockSize, block[band][channel].size());
+      RTC_DCHECK_GE(kBlockSize, buffer_[band][channel].size());
+      RTC_DCHECK_EQ(kSubFrameLength, (*sub_frame)[band][channel].size());
+
+      const int samples_to_frame =
+          kSubFrameLength - buffer_[band][channel].size();
+      std::copy(buffer_[band][channel].begin(), buffer_[band][channel].end(),
+                (*sub_frame)[band][channel].begin());
+      std::copy(
+          block[band][channel].begin(),
+          block[band][channel].begin() + samples_to_frame,
+          (*sub_frame)[band][channel].begin() + buffer_[band][channel].size());
+      buffer_[band][channel].clear();
+      buffer_[band][channel].insert(
+          buffer_[band][channel].begin(),
+          block[band][channel].begin() + samples_to_frame,
+          block[band][channel].end());
+    }
+  }
+}
+
+}  // namespace webrtc