Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 96 insertions, 0 deletions

diff --git a/third_party/aom/webmenc.cc b/third_party/aom/webmenc.cc
new file mode 100644
index 000000000..e3d209a27
--- /dev/null
+++ b/third_party/aom/webmenc.cc
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+*/
+
+#include "./webmenc.h"
+
+#include <string>
+
+#include "third_party/libwebm/mkvmuxer/mkvmuxer.h"
+#include "third_party/libwebm/mkvmuxer/mkvmuxerutil.h"
+#include "third_party/libwebm/mkvmuxer/mkvwriter.h"
+
+namespace {
+const uint64_t kDebugTrackUid = 0xDEADBEEF;
+const int kVideoTrackNumber = 1;
+}  // namespace
+
+void write_webm_file_header(struct WebmOutputContext *webm_ctx,
+                            const aom_codec_enc_cfg_t *cfg,
+                            stereo_format_t stereo_fmt, unsigned int fourcc,
+                            const struct AvxRational *par) {
+  mkvmuxer::MkvWriter *const writer = new mkvmuxer::MkvWriter(webm_ctx->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 = "aomenc";
+  if (!webm_ctx->debug) {
+    version.append(std::string(" ") + aom_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);
+  const char *codec_id;
+  switch (fourcc) {
+    case AV1_FOURCC: codec_id = "V_AV1"; break;
+    default: codec_id = "V_AV1"; break;
+  }
+  video_track->set_codec_id(codec_id);
+  if (par->numerator > 1 || par->denominator > 1) {
+    // TODO(fgalligan): Add support of DisplayUnit, Display Aspect Ratio type
+    // to WebM format.
+    const uint64_t display_width = static_cast<uint64_t>(
+        ((cfg->g_w * par->numerator * 1.0) / par->denominator) + .5);
+    video_track->set_display_width(display_width);
+    video_track->set_display_height(cfg->g_h);
+  }
+  if (webm_ctx->debug) {
+    video_track->set_uid(kDebugTrackUid);
+  }
+  webm_ctx->writer = writer;
+  webm_ctx->segment = segment;
+}
+
+void write_webm_block(struct WebmOutputContext *webm_ctx,
+                      const aom_codec_enc_cfg_t *cfg,
+                      const aom_codec_cx_pkt_t *pkt) {
+  mkvmuxer::Segment *const segment =
+      reinterpret_cast<mkvmuxer::Segment *>(webm_ctx->segment);
+  int64_t pts_ns = pkt->data.frame.pts * 1000000000ll * cfg->g_timebase.num /
+                   cfg->g_timebase.den;
+  if (pts_ns <= webm_ctx->last_pts_ns) pts_ns = webm_ctx->last_pts_ns + 1000000;
+  webm_ctx->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 & AOM_FRAME_IS_KEY);
+}
+
+void write_webm_file_footer(struct WebmOutputContext *webm_ctx) {
+  mkvmuxer::MkvWriter *const writer =
+      reinterpret_cast<mkvmuxer::MkvWriter *>(webm_ctx->writer);
+  mkvmuxer::Segment *const segment =
+      reinterpret_cast<mkvmuxer::Segment *>(webm_ctx->segment);
+  segment->Finalize();
+  delete segment;
+  delete writer;
+  webm_ctx->writer = NULL;
+  webm_ctx->segment = NULL;
+}