From 30c08634416a99a0f627e4de3a5f49dcf0a72fd3 Mon Sep 17 00:00:00 2001
From: Johann <johannkoenig@google.com>
Date: Fri, 27 Sep 2013 17:42:12 -0700
Subject: Change VP8 encoder bitrate

Allow the bitrate to be updated while the encoder is running.

Bug: 8422347
Change-Id: I8427fe20921b00f92b8f99fe21691709fab354b0
---
 .../codecs/on2/enc/SoftVPXEncoder.cpp              | 32 ++++++++++++++++++++++
 .../libstagefright/codecs/on2/enc/SoftVPXEncoder.h |  5 +++-
 2 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.cpp b/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.cpp
index 16f0f30..8375cac 100644
--- a/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.cpp
+++ b/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.cpp
@@ -141,6 +141,7 @@ SoftVPXEncoder::SoftVPXEncoder(const char *name,
       mWidth(176),
       mHeight(144),
       mBitrate(192000),  // in bps
+      mBitrateUpdated(false),
       mBitrateControlMode(VPX_VBR),  // variable bitrate
       mFrameDurationUs(33333),  // Defaults to 30 fps
       mDCTPartitions(0),
@@ -536,6 +537,22 @@ OMX_ERRORTYPE SoftVPXEncoder::setConfig(
             return OMX_ErrorNone;
         }
 
+        case OMX_IndexConfigVideoBitrate:
+        {
+            OMX_VIDEO_CONFIG_BITRATETYPE *params =
+                (OMX_VIDEO_CONFIG_BITRATETYPE *)_params;
+
+            if (params->nPortIndex != kOutputPortIndex) {
+                return OMX_ErrorBadPortIndex;
+            }
+
+            if (mBitrate != params->nEncodeBitrate) {
+                mBitrate = params->nEncodeBitrate;
+                mBitrateUpdated = true;
+            }
+            return OMX_ErrorNone;
+        }
+
         default:
             return SimpleSoftOMXComponent::setConfig(index, _params);
     }
@@ -779,6 +796,21 @@ void SoftVPXEncoder::onQueueFilled(OMX_U32 portIndex) {
             mKeyFrameRequested = false;
         }
 
+        if (mBitrateUpdated) {
+            mCodecConfiguration->rc_target_bitrate = mBitrate/1000;
+            vpx_codec_err_t res = vpx_codec_enc_config_set(mCodecContext,
+                                                           mCodecConfiguration);
+            if (res != VPX_CODEC_OK) {
+                ALOGE("vp8 encoder failed to update bitrate: %s",
+                      vpx_codec_err_to_string(res));
+                notify(OMX_EventError,
+                       OMX_ErrorUndefined,
+                       0, // Extra notification data
+                       NULL); // Notification data pointer
+            }
+            mBitrateUpdated = false;
+        }
+
         codec_return = vpx_codec_encode(
                 mCodecContext,
                 &raw_frame,
diff --git a/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.h b/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.h
index 4ee5e51..076830f 100644
--- a/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.h
+++ b/media/libstagefright/codecs/on2/enc/SoftVPXEncoder.h
@@ -128,7 +128,10 @@ private:
     int32_t mHeight;
 
     // Target bitrate set for the encoder, in bits per second.
-    int32_t mBitrate;
+    uint32_t mBitrate;
+
+    // If a request for a change it bitrate has been received.
+    bool mBitrateUpdated;
 
     // Bitrate control mode, either constant or variable
     vpx_rc_mode mBitrateControlMode;
-- 
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