package org.webrtc;
import android.media.MediaCodec;
+import android.media.MediaCodecInfo.CodecCapabilities;
import android.media.MediaCodecInfo;
import android.media.MediaCodecList;
import android.media.MediaFormat;
// This class is an implementation detail of the Java PeerConnection API.
// MediaCodec is thread-hostile so this class must be operated on a single
// thread.
-class MediaCodecVideoEncoder {
+public class MediaCodecVideoEncoder {
// This class is constructed, operated, and destroyed by its C++ incarnation,
// so the class and its methods have non-public visibility. The API this
// class exposes aims to mimic the webrtc::VideoEncoder API as closely as
private static final String TAG = "MediaCodecVideoEncoder";
private static final int DEQUEUE_TIMEOUT = 0; // Non-blocking, no wait.
+ private Thread mediaCodecThread;
private MediaCodec mediaCodec;
private ByteBuffer[] outputBuffers;
private static final String VP8_MIME_TYPE = "video/x-vnd.on2.vp8";
- private Thread mediaCodecThread;
+ // List of supported HW VP8 codecs.
+ private static final String[] supportedHwCodecPrefixes =
+ {"OMX.qcom.", "OMX.Nvidia." };
+ // Bitrate mode
+ private static final int VIDEO_ControlRateConstant = 2;
+ // NV12 color format supported by QCOM codec, but not declared in MediaCodec -
+ // see /hardware/qcom/media/mm-core/inc/OMX_QCOMExtns.h
+ private static final int
+ COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m = 0x7FA30C04;
+ // Allowable color formats supported by codec - in order of preference.
+ private static final int[] supportedColorList = {
+ CodecCapabilities.COLOR_FormatYUV420Planar,
+ CodecCapabilities.COLOR_FormatYUV420SemiPlanar,
+ CodecCapabilities.COLOR_QCOM_FormatYUV420SemiPlanar,
+ COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m
+ };
+ private int colorFormat;
private MediaCodecVideoEncoder() {}
- private static boolean isPlatformSupported() {
- if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT)
- return false; // MediaCodec.setParameters is missing.
-
- if (!Build.MODEL.equals("Nexus 5")) {
- // TODO(fischman): Currently the N5 is the only >=KK device containing a
- // HW VP8 encoder, so don't bother with any others. When this list grows,
- // update the KEY_COLOR_FORMAT logic below.
- return false;
+ // Helper struct for findVp8HwEncoder() below.
+ private static class EncoderProperties {
+ public EncoderProperties(String codecName, int colorFormat) {
+ this.codecName = codecName;
+ this.colorFormat = colorFormat;
}
+ public final String codecName; // OpenMax component name for VP8 codec.
+ public final int colorFormat; // Color format supported by codec.
+ }
+
+ private static EncoderProperties findVp8HwEncoder() {
+ if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT)
+ return null; // MediaCodec.setParameters is missing.
for (int i = 0; i < MediaCodecList.getCodecCount(); ++i) {
MediaCodecInfo info = MediaCodecList.getCodecInfoAt(i);
- if (!info.isEncoder())
+ if (!info.isEncoder()) {
continue;
+ }
String name = null;
for (String mimeType : info.getSupportedTypes()) {
if (mimeType.equals(VP8_MIME_TYPE)) {
break;
}
}
- if (name == null)
+ if (name == null) {
continue; // No VP8 support in this codec; try the next one.
- if (name.startsWith("OMX.google.") || name.startsWith("OMX.SEC.")) {
- // SW encoder is highest priority VP8 codec; unlikely we can get HW.
- // "OMX.google." is known-software, while "OMX.SEC." is sometimes SW &
- // sometimes HW, although not VP8 HW in any known device, so treat as SW
- // here (b/9735008 #20).
- return false;
}
- return true; // Yay, passed the gauntlet of pre-requisites!
+ Log.d(TAG, "Found candidate encoder " + name);
+
+ // Check if this is supported HW encoder.
+ boolean supportedCodec = false;
+ for (String hwCodecPrefix : supportedHwCodecPrefixes) {
+ if (name.startsWith(hwCodecPrefix)) {
+ supportedCodec = true;
+ break;
+ }
+ }
+ if (!supportedCodec) {
+ continue;
+ }
+
+ CodecCapabilities capabilities =
+ info.getCapabilitiesForType(VP8_MIME_TYPE);
+ for (int colorFormat : capabilities.colorFormats) {
+ Log.d(TAG, " Color: 0x" + Integer.toHexString(colorFormat));
+ }
+
+ // Check if codec supports either yuv420 or nv12.
+ for (int supportedColorFormat : supportedColorList) {
+ for (int codecColorFormat : capabilities.colorFormats) {
+ if (codecColorFormat == supportedColorFormat) {
+ // Found supported HW VP8 encoder.
+ Log.d(TAG, "Found target encoder " + name +
+ ". Color: 0x" + Integer.toHexString(codecColorFormat));
+ return new EncoderProperties(name, codecColorFormat);
+ }
+ }
+ }
}
- return false; // No VP8 encoder.
+ return null; // No HW VP8 encoder.
}
- private static int bitRate(int kbps) {
- // webrtc "kilo" means 1000, not 1024. Apparently.
- // (and the price for overshooting is frame-dropping as webrtc enforces its
- // bandwidth estimation, which is unpleasant).
- // Since the HW encoder in the N5 overshoots, we clamp to a bit less than
- // the requested rate. Sad but true. Bug 3194.
- return kbps * 950;
+ public static boolean isPlatformSupported() {
+ return findVp8HwEncoder() != null;
}
private void checkOnMediaCodecThread() {
}
}
+ static MediaCodec createByCodecName(String codecName) {
+ try {
+ // In the L-SDK this call can throw IOException so in order to work in
+ // both cases catch an exception.
+ return MediaCodec.createByCodecName(codecName);
+ } catch (Exception e) {
+ return null;
+ }
+ }
+
// Return the array of input buffers, or null on failure.
- private ByteBuffer[] initEncode(int width, int height, int kbps) {
+ private ByteBuffer[] initEncode(int width, int height, int kbps, int fps) {
+ Log.d(TAG, "Java initEncode: " + width + " x " + height +
+ ". @ " + kbps + " kbps. Fps: " + fps +
+ ". Color: 0x" + Integer.toHexString(colorFormat));
if (mediaCodecThread != null) {
throw new RuntimeException("Forgot to release()?");
}
+ EncoderProperties properties = findVp8HwEncoder();
+ if (properties == null) {
+ throw new RuntimeException("Can not find HW VP8 encoder");
+ }
mediaCodecThread = Thread.currentThread();
try {
MediaFormat format =
MediaFormat.createVideoFormat(VP8_MIME_TYPE, width, height);
- format.setInteger(MediaFormat.KEY_BIT_RATE, bitRate(kbps));
- // Arbitrary choices.
- format.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
- format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 450);
- // TODO(fischman): when there is more than just the N5 with a VP8 HW
- // encoder, negotiate input colorformats with the codec. For now
- // hard-code qcom's supported value. See isPlatformSupported above.
- format.setInteger(
- MediaFormat.KEY_COLOR_FORMAT,
- MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar);
- mediaCodec = MediaCodec.createEncoderByType(VP8_MIME_TYPE);
+ format.setInteger(MediaFormat.KEY_BIT_RATE, 1000 * kbps);
+ format.setInteger("bitrate-mode", VIDEO_ControlRateConstant);
+ format.setInteger(MediaFormat.KEY_COLOR_FORMAT, properties.colorFormat);
+ // Default WebRTC settings
+ format.setInteger(MediaFormat.KEY_FRAME_RATE, fps);
+ format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 100);
+ Log.d(TAG, " Format: " + format);
+ mediaCodec = createByCodecName(properties.codecName);
if (mediaCodec == null) {
return null;
}
mediaCodec.configure(
format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mediaCodec.start();
+ colorFormat = properties.colorFormat;
outputBuffers = mediaCodec.getOutputBuffers();
- return mediaCodec.getInputBuffers();
+ ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
+ Log.d(TAG, "Input buffers: " + inputBuffers.length +
+ ". Output buffers: " + outputBuffers.length);
+ return inputBuffers;
} catch (IllegalStateException e) {
Log.e(TAG, "initEncode failed", e);
return null;
// indicate this in queueInputBuffer() below and guarantee _this_ frame
// be encoded as a key frame, but sadly that flag is ignored. Instead,
// we request a key frame "soon".
+ Log.d(TAG, "Sync frame request");
Bundle b = new Bundle();
b.putInt(MediaCodec.PARAMETER_KEY_REQUEST_SYNC_FRAME, 0);
mediaCodec.setParameters(b);
}
private void release() {
+ Log.d(TAG, "Java releaseEncoder");
checkOnMediaCodecThread();
try {
mediaCodec.stop();
}
private boolean setRates(int kbps, int frameRateIgnored) {
+ // frameRate argument is ignored - HW encoder is supposed to use
+ // video frame timestamps for bit allocation.
checkOnMediaCodecThread();
+ Log.v(TAG, "setRates: " + kbps + " kbps. Fps: " + frameRateIgnored);
try {
Bundle params = new Bundle();
- params.putInt(MediaCodec.PARAMETER_KEY_VIDEO_BITRATE, bitRate(kbps));
+ params.putInt(MediaCodec.PARAMETER_KEY_VIDEO_BITRATE, 1000 * kbps);
mediaCodec.setParameters(params);
- // Sure would be nice to honor the frameRate argument to this function,
- // but MediaCodec doesn't expose that particular knob. b/12977358
return true;
} catch (IllegalStateException e) {
Log.e(TAG, "setRates failed", e);
outputBuffer.limit(info.offset + info.size);
boolean isKeyFrame =
(info.flags & MediaCodec.BUFFER_FLAG_SYNC_FRAME) != 0;
+ if (isKeyFrame) {
+ Log.d(TAG, "Sync frame generated");
+ }
return new OutputBufferInfo(
result, outputBuffer.slice(), isKeyFrame, info.presentationTimeUs);
} else if (result == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED) {
projects / platform / framework / web / crosswalk.git / blobdiff