From 4154795d5526750b7aec5f774831a9e1ba0a3f15 Mon Sep 17 00:00:00 2001
From: Alex Glaznev <glaznev@google.com>
Date: Thu, 20 Mar 2014 17:32:57 -0700
Subject: Support VP8 encoder key frame interval and number of temporal layers
 configuration.

- Change ACodec.cpp to populate VP8 extra parameters
structure with key frame interval, number of temporal
layers and quantization parameters.

- Change software VP8 encoder to select frame temporal
patterns and temporal layers bitrate distribution based
on the number of layers similar to patterns used in WebRTC.

- Calculate video frame duration in VP8 encoder from the
timestamps.

Bug: 11969958
Change-Id: Ia96054d886cd09d8c108dfe250fc5f4478eaa042
---
 media/libstagefright/ACodec.cpp | 70 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

(limited to 'media/libstagefright/ACodec.cpp')

diff --git a/media/libstagefright/ACodec.cpp b/media/libstagefright/ACodec.cpp
index 9164e5c..20a5a8b 100644
--- a/media/libstagefright/ACodec.cpp
+++ b/media/libstagefright/ACodec.cpp
@@ -36,6 +36,7 @@
 #include <media/hardware/HardwareAPI.h>
 
 #include <OMX_AudioExt.h>
+#include <OMX_VideoExt.h>
 #include <OMX_Component.h>
 #include <OMX_IndexExt.h>
 
@@ -2369,12 +2370,81 @@ status_t ACodec::setupAVCEncoderParameters(const sp<AMessage> &msg) {
 
 status_t ACodec::setupVPXEncoderParameters(const sp<AMessage> &msg) {
     int32_t bitrate;
+    int32_t iFrameInterval = 0;
+    size_t tsLayers = 0;
+    OMX_VIDEO_ANDROID_VPXTEMPORALLAYERPATTERNTYPE pattern =
+        OMX_VIDEO_VPXTemporalLayerPatternNone;
+    static const uint32_t kVp8LayerRateAlloction
+        [OMX_VIDEO_ANDROID_MAXVP8TEMPORALLAYERS]
+        [OMX_VIDEO_ANDROID_MAXVP8TEMPORALLAYERS] = {
+        {100, 100, 100},  // 1 layer
+        { 60, 100, 100},  // 2 layers {60%, 40%}
+        { 40,  60, 100},  // 3 layers {40%, 20%, 40%}
+    };
     if (!msg->findInt32("bitrate", &bitrate)) {
         return INVALID_OPERATION;
     }
+    msg->findInt32("i-frame-interval", &iFrameInterval);
 
     OMX_VIDEO_CONTROLRATETYPE bitrateMode = getBitrateMode(msg);
 
+    float frameRate;
+    if (!msg->findFloat("frame-rate", &frameRate)) {
+        int32_t tmp;
+        if (!msg->findInt32("frame-rate", &tmp)) {
+            return INVALID_OPERATION;
+        }
+        frameRate = (float)tmp;
+    }
+
+    AString tsSchema;
+    if (msg->findString("ts-schema", &tsSchema)) {
+        if (tsSchema == "webrtc.vp8.1-layer") {
+            pattern = OMX_VIDEO_VPXTemporalLayerPatternWebRTC;
+            tsLayers = 1;
+        } else if (tsSchema == "webrtc.vp8.2-layer") {
+            pattern = OMX_VIDEO_VPXTemporalLayerPatternWebRTC;
+            tsLayers = 2;
+        } else if (tsSchema == "webrtc.vp8.3-layer") {
+            pattern = OMX_VIDEO_VPXTemporalLayerPatternWebRTC;
+            tsLayers = 3;
+        } else {
+            ALOGW("Unsupported ts-schema [%s]", tsSchema.c_str());
+        }
+    }
+
+    OMX_VIDEO_PARAM_ANDROID_VP8ENCODERTYPE vp8type;
+    InitOMXParams(&vp8type);
+    vp8type.nPortIndex = kPortIndexOutput;
+    status_t err = mOMX->getParameter(
+            mNode, (OMX_INDEXTYPE)OMX_IndexParamVideoAndroidVp8Encoder,
+            &vp8type, sizeof(vp8type));
+
+    if (err == OK) {
+        if (iFrameInterval > 0) {
+            vp8type.nKeyFrameInterval = setPFramesSpacing(iFrameInterval, frameRate);
+        }
+        vp8type.eTemporalPattern = pattern;
+        vp8type.nTemporalLayerCount = tsLayers;
+        if (tsLayers > 0) {
+            for (size_t i = 0; i < OMX_VIDEO_ANDROID_MAXVP8TEMPORALLAYERS; i++) {
+                vp8type.nTemporalLayerBitrateRatio[i] =
+                    kVp8LayerRateAlloction[tsLayers - 1][i];
+            }
+        }
+        if (bitrateMode == OMX_Video_ControlRateConstant) {
+            vp8type.nMinQuantizer = 2;
+            vp8type.nMaxQuantizer = 63;
+        }
+
+        err = mOMX->setParameter(
+                mNode, (OMX_INDEXTYPE)OMX_IndexParamVideoAndroidVp8Encoder,
+                &vp8type, sizeof(vp8type));
+        if (err != OK) {
+            ALOGW("Extended VP8 parameters set failed: %d", err);
+        }
+    }
+
     return configureBitrate(bitrate, bitrateMode);
 }
 
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