fix timestamp calculation rollover w/altref

using large values for the timebase, e.g., {33333, 1000000} could
rollover the timestamp calculation in vp8e_encode as it was not using
64-bit math.

originally reported on ffmpeg's trac:
  https://ffmpeg.org/trac/ffmpeg/ticket/1014

BUG=468

Change-Id: Iedb4e11de086a3dda75097bfaf08f2488e2088d8

test/altref_test.cc

@@ -0,0 +1,71 @@
+/*
+ *  Copyright (c) 2012 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 "third_party/googletest/src/include/gtest/gtest.h"
+#include "test/encode_test_driver.h"
+#include "test/i420_video_source.h"
+
+namespace {
+
+// lookahead range: [kLookAheadMin, kLookAheadMax).
+const int kLookAheadMin = 5;
+const int kLookAheadMax = 26;
+
+class AltRefTest : public libvpx_test::EncoderTest,
+    public ::testing::TestWithParam<int> {
+ protected:
+  AltRefTest() : altref_count_(0) {}
+  virtual ~AltRefTest() {}
+
+  virtual void SetUp() {
+    InitializeConfig();
+    SetMode(libvpx_test::kTwoPassGood);
+  }
+
+  virtual void BeginPassHook(unsigned int pass) {
+    altref_count_ = 0;
+  }
+
+  virtual bool Continue() const {
+    return !HasFatalFailure() && !abort_;
+  }
+
+  virtual void PreEncodeFrameHook(libvpx_test::VideoSource *video,
+                                  libvpx_test::Encoder *encoder) {
+    if (video->frame() == 1) {
+      encoder->Control(VP8E_SET_ENABLEAUTOALTREF, 1);
+      encoder->Control(VP8E_SET_CPUUSED, 3);
+    }
+  }
+
+  virtual void FramePktHook(const vpx_codec_cx_pkt_t *pkt) {
+    if (pkt->data.frame.flags & VPX_FRAME_IS_INVISIBLE) ++altref_count_;
+  }
+
+  int altref_count() const { return altref_count_; }
+
+ private:
+  int altref_count_;
+};
+
+TEST_P(AltRefTest, MonotonicTimestamps) {
+  const vpx_rational timebase = { 33333333, 1000000000 };
+  cfg_.g_timebase = timebase;
+  cfg_.rc_target_bitrate = 1000;
+  cfg_.g_lag_in_frames = GetParam();
+
+  libvpx_test::I420VideoSource video("hantro_collage_w352h288.yuv", 352, 288,
+                                     timebase.den, timebase.num, 0, 30);
+  ASSERT_NO_FATAL_FAILURE(RunLoop(&video));
+  EXPECT_GE(altref_count(), 1);
+}
+
+INSTANTIATE_TEST_CASE_P(NonZeroLag, AltRefTest,
+                        ::testing::Range(kLookAheadMin, kLookAheadMax));
+}  // namespace

test/test.mk

@@ -8,6 +8,7 @@ LIBVPX_TEST_SRCS-yes += util.h
 ##
 ## Black box tests only use the public API.
 ##
+LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += altref_test.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += config_test.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += encode_test_driver.cc
 LIBVPX_TEST_SRCS-$(CONFIG_VP8_ENCODER) += encode_test_driver.h

vp8/vp8_cx_iface.c

@@ -891,7 +891,8 @@ static vpx_codec_err_t vp8e_encode(vpx_codec_alg_priv_t  *ctx,
                 VP8_COMP *cpi = (VP8_COMP *)ctx->cpi;
 
                 /* Add the frame packet to the list of returned packets. */
-                round = 1000000 * ctx->cfg.g_timebase.num / 2 - 1;
+                round = (vpx_codec_pts_t)1000000
+                        * ctx->cfg.g_timebase.num / 2 - 1;
                 delta = (dst_end_time_stamp - dst_time_stamp);
                 pkt.kind = VPX_CODEC_CX_FRAME_PKT;
                 pkt.data.frame.pts =