From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 media/libstagefright/binding/Adts.cpp | 75 +++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 media/libstagefright/binding/Adts.cpp

(limited to 'media/libstagefright/binding/Adts.cpp')

diff --git a/media/libstagefright/binding/Adts.cpp b/media/libstagefright/binding/Adts.cpp
new file mode 100644
index 000000000..4146ff008
--- /dev/null
+++ b/media/libstagefright/binding/Adts.cpp
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mp4_demuxer/Adts.h"
+#include "MediaData.h"
+#include "mozilla/Array.h"
+#include "mozilla/ArrayUtils.h"
+#include "nsAutoPtr.h"
+
+using namespace mozilla;
+
+namespace mp4_demuxer
+{
+
+int8_t
+Adts::GetFrequencyIndex(uint32_t aSamplesPerSecond)
+{
+  static const uint32_t freq_lookup[] = { 96000, 88200, 64000, 48000, 44100,
+                                          32000, 24000, 22050, 16000, 12000,
+                                          11025, 8000,  7350,  0};
+
+  int8_t i = 0;
+  while (freq_lookup[i] && aSamplesPerSecond < freq_lookup[i]) {
+    i++;
+  }
+
+  if (!freq_lookup[i]) {
+    return -1;
+  }
+
+  return i;
+}
+
+bool
+Adts::ConvertSample(uint16_t aChannelCount, int8_t aFrequencyIndex,
+                    int8_t aProfile, MediaRawData* aSample)
+{
+  static const int kADTSHeaderSize = 7;
+
+  size_t newSize = aSample->Size() + kADTSHeaderSize;
+
+  // ADTS header uses 13 bits for packet size.
+  if (newSize >= (1 << 13) || aChannelCount > 15 ||
+      aFrequencyIndex < 0 || aProfile < 1 || aProfile > 4) {
+    return false;
+  }
+
+  Array<uint8_t, kADTSHeaderSize> header;
+  header[0] = 0xff;
+  header[1] = 0xf1;
+  header[2] =
+    ((aProfile - 1) << 6) + (aFrequencyIndex << 2) + (aChannelCount >> 2);
+  header[3] = ((aChannelCount & 0x3) << 6) + (newSize >> 11);
+  header[4] = (newSize & 0x7ff) >> 3;
+  header[5] = ((newSize & 7) << 5) + 0x1f;
+  header[6] = 0xfc;
+
+  nsAutoPtr<MediaRawDataWriter> writer(aSample->CreateWriter());
+  if (!writer->Prepend(&header[0], ArrayLength(header))) {
+    return false;
+  }
+
+  if (aSample->mCrypto.mValid) {
+    if (aSample->mCrypto.mPlainSizes.Length() == 0) {
+      writer->mCrypto.mPlainSizes.AppendElement(kADTSHeaderSize);
+      writer->mCrypto.mEncryptedSizes.AppendElement(aSample->Size() - kADTSHeaderSize);
+    } else {
+      writer->mCrypto.mPlainSizes[0] += kADTSHeaderSize;
+    }
+  }
+
+  return true;
+}
+}
-- 
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