Changing webmenc to use libwebm

Changing webmenc to use libwebm for WebM file muxing.

Change-Id: I38ccc74f35c6b9684a87d04d8f9354dbe9a3263b

webmenc.cc

diff --git a/webmenc.cc b/webmenc.cc
new file mode 100644
index 0000000..a0e542b
--- /dev/null
+++ b/webmenc.cc
@@ -0,0 +1,87 @@
+/*
+ *  Copyright (c) 2014 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 "./webmenc.h"
+
+#include <string>
+
+#include "third_party/libwebm/mkvmuxer.hpp"
+#include "third_party/libwebm/mkvmuxerutil.hpp"
+#include "third_party/libwebm/mkvwriter.hpp"
+
+namespace {
+const uint64_t kDebugTrackUid = 0xDEADBEEF;
+const int kVideoTrackNumber = 1;
+}  // namespace
+
+void write_webm_file_header(struct EbmlGlobal *glob,
+                            const vpx_codec_enc_cfg_t *cfg,
+                            const struct vpx_rational *fps,
+                            stereo_format_t stereo_fmt,
+                            unsigned int fourcc) {
+  mkvmuxer::MkvWriter *const writer = new mkvmuxer::MkvWriter(glob->stream);
+  mkvmuxer::Segment *const segment = new mkvmuxer::Segment();
+  segment->Init(writer);
+  segment->set_mode(mkvmuxer::Segment::kFile);
+  segment->OutputCues(true);
+
+  mkvmuxer::SegmentInfo *const info = segment->GetSegmentInfo();
+  const uint64_t kTimecodeScale = 1000000;
+  info->set_timecode_scale(kTimecodeScale);
+  std::string version = "vpxenc";
+  if (!glob->debug) {
+    version.append(std::string(" ") + vpx_codec_version_str());
+  }
+  info->set_writing_app(version.c_str());
+
+  const uint64_t video_track_id =
+      segment->AddVideoTrack(static_cast<int>(cfg->g_w),
+                             static_cast<int>(cfg->g_h),
+                             kVideoTrackNumber);
+  mkvmuxer::VideoTrack* const video_track =
+      static_cast<mkvmuxer::VideoTrack*>(
+          segment->GetTrackByNumber(video_track_id));
+  video_track->SetStereoMode(stereo_fmt);
+  video_track->set_codec_id(fourcc == VP8_FOURCC ? "V_VP8" : "V_VP9");
+  if (glob->debug) {
+    video_track->set_uid(kDebugTrackUid);
+  }
+  glob->writer = writer;
+  glob->segment = segment;
+}
+
+void write_webm_block(struct EbmlGlobal *glob,
+                      const vpx_codec_enc_cfg_t *cfg,
+                      const vpx_codec_cx_pkt_t *pkt) {
+  mkvmuxer::Segment *const segment =
+      reinterpret_cast<mkvmuxer::Segment*>(glob->segment);
+  int64_t pts_ns = pkt->data.frame.pts * 1000000000ll *
+                   cfg->g_timebase.num / cfg->g_timebase.den;
+  if (pts_ns <= glob->last_pts_ns)
+    pts_ns = glob->last_pts_ns + 1000000;
+  glob->last_pts_ns = pts_ns;
+
+  segment->AddFrame(static_cast<uint8_t*>(pkt->data.frame.buf),
+                    pkt->data.frame.sz,
+                    kVideoTrackNumber,
+                    pts_ns,
+                    pkt->data.frame.flags & VPX_FRAME_IS_KEY);
+}
+
+void write_webm_file_footer(struct EbmlGlobal *glob) {
+  mkvmuxer::MkvWriter *const writer =
+      reinterpret_cast<mkvmuxer::MkvWriter*>(glob->writer);
+  mkvmuxer::Segment *const segment =
+      reinterpret_cast<mkvmuxer::Segment*>(glob->segment);
+  segment->Finalize();
+  delete segment;
+  delete writer;
+  glob->writer = NULL;
+  glob->segment = NULL;
+}