Index: webrtc/modules/audio_coding/codecs/split_by_samples.cc |
diff --git a/webrtc/modules/audio_coding/codecs/split_by_samples.cc b/webrtc/modules/audio_coding/codecs/split_by_samples.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..6c4f6796f62486dd695ad94240065ac9f3d9f2ba |
--- /dev/null |
+++ b/webrtc/modules/audio_coding/codecs/split_by_samples.cc |
@@ -0,0 +1,55 @@ |
+/* |
+ * 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 "webrtc/modules/audio_coding/codecs/split_by_samples.h" |
+ |
+namespace webrtc { |
+ |
+namespace internal { |
+ |
+std::vector<AudioDecoder::PacketSplit> SplitBySamples( |
+ rtc::ArrayView<const uint8_t> payload, |
+ size_t bytes_per_ms, |
+ uint32_t timestamps_per_ms) { |
+ RTC_DCHECK(payload.data()); |
+ std::vector<AudioDecoder::PacketSplit> splits; |
+ size_t split_size_bytes = payload.size(); |
+ |
+ // Find a "chunk size" >= 20 ms and < 40 ms. |
+ size_t min_chunk_size = bytes_per_ms * 20; |
kwiberg-webrtc
2016/09/12 02:11:01
const
ossu
2016/09/12 11:26:37
Acknowledged.
|
+ // Reduce the split size by half as long as |split_size_bytes| is at least |
+ // twice the minimum chunk size (so that the resulting size is at least as |
+ // large as the minimum chunk size). |
+ while (split_size_bytes >= 2 * min_chunk_size) { |
+ split_size_bytes >>= 1; |
+ } |
+ uint32_t timestamps_per_chunk = static_cast<uint32_t>( |
kwiberg-webrtc
2016/09/12 02:11:01
const
ossu
2016/09/12 11:26:37
Acknowledged.
|
+ split_size_bytes * timestamps_per_ms / bytes_per_ms); |
+ AudioDecoder::PacketSplit split = {0, split_size_bytes, 0}; |
+ size_t len = payload.size(); |
+ for (len = payload.size(); |
kwiberg-webrtc
2016/09/12 02:11:01
You initialize twice.
ossu
2016/09/12 11:26:37
Would you look at that!
|
+ len >= (2 * split_size_bytes); |
+ len -= split_size_bytes) { |
+ splits.push_back(split); |
+ split.byte_offset += split_size_bytes; |
+ split.timestamp_offset += timestamps_per_chunk; |
+ } |
+ |
+ if (len > 0) { |
+ split.num_bytes = len; |
+ splits.push_back(split); |
+ } |
+ |
+ return splits; |
+} |
+ |
+} // namespace internal |
+ |
+} // namespace webrtc |