1 files changed, 196 insertions, 0 deletions
diff --git a/dom/media/ogg/OggWriter.cpp b/dom/media/ogg/OggWriter.cpp
new file mode 100644
index 0000000000..f43ffcbb5d
--- /dev/null
+++ b/dom/media/ogg/OggWriter.cpp
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* 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 "OggWriter.h"
+#include "prtime.h"
+#include "mozilla/ProfilerLabels.h"
+
+#define LOG(args, ...)
+
+namespace mozilla {
+
+OggWriter::OggWriter() : mOggStreamState(), mOggPage(), mPacket() {
+  if (NS_FAILED(Init())) {
+    LOG("ERROR! Fail to initialize the OggWriter.");
+  }
+}
+
+OggWriter::~OggWriter() {
+  if (mInitialized) {
+    ogg_stream_clear(&mOggStreamState);
+  }
+  // mPacket's data was always owned by us, no need to ogg_packet_clear.
+}
+
+nsresult OggWriter::Init() {
+  MOZ_ASSERT(!mInitialized);
+
+  // The serial number (serialno) should be a random number, for the current
+  // implementation where the output file contains only a single stream, this
+  // serialno is used to differentiate between files.
+  srand(static_cast<unsigned>(PR_Now()));
+  int rc = ogg_stream_init(&mOggStreamState, rand());
+
+  mPacket.b_o_s = 1;
+  mPacket.e_o_s = 0;
+  mPacket.granulepos = 0;
+  mPacket.packet = nullptr;
+  mPacket.packetno = 0;
+  mPacket.bytes = 0;
+
+  mInitialized = (rc == 0);
+
+  return (rc == 0) ? NS_OK : NS_ERROR_NOT_INITIALIZED;
+}
+
+nsresult OggWriter::WriteEncodedTrack(
+    const nsTArray<RefPtr<EncodedFrame>>& aData, uint32_t aFlags) {
+  AUTO_PROFILER_LABEL("OggWriter::WriteEncodedTrack", OTHER);
+
+  uint32_t len = aData.Length();
+  for (uint32_t i = 0; i < len; i++) {
+    if (aData[i]->mFrameType != EncodedFrame::OPUS_AUDIO_FRAME) {
+      LOG("[OggWriter] wrong encoded data type!");
+      return NS_ERROR_FAILURE;
+    }
+
+    // only pass END_OF_STREAM on the last frame!
+    nsresult rv = WriteEncodedData(
+        *aData[i]->mFrameData, aData[i]->mDuration,
+        i < len - 1 ? (aFlags & ~ContainerWriter::END_OF_STREAM) : aFlags);
+    if (NS_FAILED(rv)) {
+      LOG("%p Failed to WriteEncodedTrack!", this);
+      return rv;
+    }
+  }
+  return NS_OK;
+}
+
+nsresult OggWriter::WriteEncodedData(const nsTArray<uint8_t>& aBuffer,
+                                     int aDuration, uint32_t aFlags) {
+  if (!mInitialized) {
+    LOG("[OggWriter] OggWriter has not initialized!");
+    return NS_ERROR_FAILURE;
+  }
+
+  MOZ_ASSERT(!ogg_stream_eos(&mOggStreamState),
+             "No data can be written after eos has marked.");
+
+  // Set eos flag to true, and once the eos is written to a packet, there must
+  // not be anymore pages after a page has marked as eos.
+  if (aFlags & ContainerWriter::END_OF_STREAM) {
+    LOG("[OggWriter] Set e_o_s flag to true.");
+    mPacket.e_o_s = 1;
+  }
+
+  mPacket.packet = const_cast<uint8_t*>(aBuffer.Elements());
+  mPacket.bytes = aBuffer.Length();
+  mPacket.granulepos += aDuration;
+
+  // 0 returned on success. -1 returned in the event of internal error.
+  // The data in the packet is copied into the internal storage managed by the
+  // mOggStreamState, so we are free to alter the contents of mPacket after
+  // this call has returned.
+  int rc = ogg_stream_packetin(&mOggStreamState, &mPacket);
+  if (rc < 0) {
+    LOG("[OggWriter] Failed in ogg_stream_packetin! (%d).", rc);
+    return NS_ERROR_FAILURE;
+  }
+
+  if (mPacket.b_o_s) {
+    mPacket.b_o_s = 0;
+  }
+  mPacket.packetno++;
+  mPacket.packet = nullptr;
+
+  return NS_OK;
+}
+
+void OggWriter::ProduceOggPage(nsTArray<nsTArray<uint8_t>>* aOutputBufs) {
+  aOutputBufs->AppendElement();
+  aOutputBufs->LastElement().SetLength(mOggPage.header_len + mOggPage.body_len);
+  memcpy(aOutputBufs->LastElement().Elements(), mOggPage.header,
+         mOggPage.header_len);
+  memcpy(aOutputBufs->LastElement().Elements() + mOggPage.header_len,
+         mOggPage.body, mOggPage.body_len);
+}
+
+nsresult OggWriter::GetContainerData(nsTArray<nsTArray<uint8_t>>* aOutputBufs,
+                                     uint32_t aFlags) {
+  int rc = -1;
+  AUTO_PROFILER_LABEL("OggWriter::GetContainerData", OTHER);
+  // Generate the oggOpus Header
+  if (aFlags & ContainerWriter::GET_HEADER) {
+    OpusMetadata* meta = static_cast<OpusMetadata*>(mMetadata.get());
+    NS_ASSERTION(meta, "should have meta data");
+    NS_ASSERTION(meta->GetKind() == TrackMetadataBase::METADATA_OPUS,
+                 "should have Opus meta data");
+
+    nsresult rv = WriteEncodedData(meta->mIdHeader, 0);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rc = ogg_stream_flush(&mOggStreamState, &mOggPage);
+    NS_ENSURE_TRUE(rc > 0, NS_ERROR_FAILURE);
+    ProduceOggPage(aOutputBufs);
+
+    rv = WriteEncodedData(meta->mCommentHeader, 0);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rc = ogg_stream_flush(&mOggStreamState, &mOggPage);
+    NS_ENSURE_TRUE(rc > 0, NS_ERROR_FAILURE);
+
+    // Force generate a page even if the amount of packet data is not enough.
+    // Usually do so after a header packet.
+
+    ProduceOggPage(aOutputBufs);
+  }
+
+  // return value 0 means insufficient data has accumulated to fill a page, or
+  // an internal error has occurred.
+  while (ogg_stream_pageout(&mOggStreamState, &mOggPage) != 0) {
+    ProduceOggPage(aOutputBufs);
+  }
+
+  if (aFlags & ContainerWriter::FLUSH_NEEDED) {
+    // return value 0 means no packet to put into a page, or an internal error.
+    if (ogg_stream_flush(&mOggStreamState, &mOggPage) != 0) {
+      ProduceOggPage(aOutputBufs);
+    }
+    mIsWritingComplete = true;
+  }
+
+  // We always return NS_OK here since it's OK to call this without having
+  // enough data to fill a page. It's the more common case compared to internal
+  // errors, and we cannot distinguish the two.
+  return NS_OK;
+}
+
+nsresult OggWriter::SetMetadata(
+    const nsTArray<RefPtr<TrackMetadataBase>>& aMetadata) {
+  MOZ_ASSERT(aMetadata.Length() == 1);
+  MOZ_ASSERT(aMetadata[0]);
+
+  AUTO_PROFILER_LABEL("OggWriter::SetMetadata", OTHER);
+
+  if (aMetadata[0]->GetKind() != TrackMetadataBase::METADATA_OPUS) {
+    LOG("wrong meta data type!");
+    return NS_ERROR_FAILURE;
+  }
+  // Validate each field of METADATA
+  mMetadata = static_cast<OpusMetadata*>(aMetadata[0].get());
+  if (mMetadata->mIdHeader.Length() == 0) {
+    LOG("miss mIdHeader!");
+    return NS_ERROR_FAILURE;
+  }
+  if (mMetadata->mCommentHeader.Length() == 0) {
+    LOG("miss mCommentHeader!");
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+}  // namespace mozilla
+
+#undef LOG