diff --git a/src/native/vpx/org_jitsi_impl_neomedia_recording_WebmWriter.cc b/src/native/vpx/org_jitsi_impl_neomedia_recording_WebmWriter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a654ba2f8730f47c56ee32686b573b87f722448f
--- /dev/null
+++ b/src/native/vpx/org_jitsi_impl_neomedia_recording_WebmWriter.cc
@@ -0,0 +1,478 @@
+#include <assert.h>
+#include <jni.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <new>
+
+#include "vpx/vpx_codec.h"
+#include "vpx/vpx_encoder.h"
+
+extern "C" {
+#include "libmkv/EbmlWriter.h"
+#include "libmkv/EbmlIDs.h"
+}
+#define LITERALU64(n) n##LLU
+
+#ifdef NDEBUG
+# define printf(fmt, ...)
+#else
+# ifdef ANDROID_NDK
+# include <android/log.h>
+# define printf(fmt, ...) \
+ __android_log_print(ANDROID_LOG_DEBUG, "LIBVPX_WEBM", fmt, ##__VA_ARGS__)
+# else
+# define printf(fmt, ...) \
+ printf(fmt "\n", ##__VA_ARGS__)
+# endif
+#endif
+
+#define FUNC(RETURN_TYPE, NAME, ...) \
+ extern "C" { \
+ JNIEXPORT RETURN_TYPE Java_org_jitsi_impl_neomedia_recording_WebmWriter_ ## NAME \
+ (JNIEnv * env, jobject thiz, ##__VA_ARGS__);\
+ } \
+ JNIEXPORT RETURN_TYPE Java_org_jitsi_impl_neomedia_recording_WebmWriter_ ## NAME \
+ (JNIEnv * env, jobject thiz, ##__VA_ARGS__)\
+
+#define STRING_RETURN(JNI_NAME, LIBVPX_NAME) \
+ FUNC(jstring, JNI_NAME) { \
+ printf(#JNI_NAME); \
+ return env->NewStringUTF(LIBVPX_NAME()); \
+ }
+
+/* Stereo 3D packed frame format */
+typedef enum stereo_format {
+ STEREO_FORMAT_MONO = 0,
+ STEREO_FORMAT_LEFT_RIGHT = 1,
+ STEREO_FORMAT_BOTTOM_TOP = 2,
+ STEREO_FORMAT_TOP_BOTTOM = 3,
+ STEREO_FORMAT_RIGHT_LEFT = 11
+} stereo_format_t;
+
+typedef off_t EbmlLoc;
+
+struct cue_entry {
+ unsigned int time;
+ uint64_t loc;
+};
+
+extern "C" {
+struct EbmlGlobal {
+ FILE *stream;
+ int64_t last_pts_ms;
+
+ /* These pointers are to the start of an element */
+ off_t position_reference;
+ off_t seek_info_pos;
+ off_t segment_info_pos;
+ off_t track_pos;
+ off_t cue_pos;
+ off_t cluster_pos;
+
+ /* This pointer is to a specific element to be serialized */
+ off_t track_id_pos;
+
+ /* These pointers are to the size field of the element */
+ EbmlLoc startSegment;
+ EbmlLoc startCluster;
+
+ uint32_t cluster_timecode;
+ int cluster_open;
+
+ struct cue_entry *cue_list;
+ unsigned int cues;
+};
+}
+
+FUNC(jlong, allocCfg) {
+ EbmlGlobal *glob = new (std::nothrow) EbmlGlobal;
+
+ if (glob) {
+ memset(glob, 0, sizeof(*glob));
+ glob->last_pts_ms = -1;
+ }
+
+ return (intptr_t)glob;
+}
+
+FUNC(void, freeCfg, jlong jglob) {
+ const EbmlGlobal *glob = reinterpret_cast<EbmlGlobal*>(jglob);
+
+ if (glob != NULL) {
+ if (glob->stream)
+ fclose(glob->stream);
+
+ free(glob->cue_list);
+
+ delete glob;
+
+ glob = 0;
+ }
+}
+
+FUNC(jboolean, openFile, jlong jglob, jstring fileName) {
+ EbmlGlobal *glob = reinterpret_cast<EbmlGlobal*>(jglob);
+ const char *mfile = env->GetStringUTFChars(fileName, 0);
+
+ glob->stream = fopen(mfile, "wb");
+
+ env->ReleaseStringUTFChars(fileName, mfile);
+
+ if (!glob->stream)
+ return JNI_TRUE;
+
+ return JNI_FALSE;
+}
+
+extern "C" {
+void Ebml_Write(EbmlGlobal *glob, const void *buffer_in, unsigned long len) {
+ if (fwrite(buffer_in, 1, len, glob->stream))
+ ;
+}
+}
+
+#define WRITE_BUFFER(s) \
+ for (i = len - 1; i >= 0; i--) { \
+ x = *(const s *)buffer_in >> (i * CHAR_BIT); \
+ Ebml_Write(glob, &x, 1ULL); \
+ }
+extern "C" {
+void Ebml_Serialize(EbmlGlobal *glob, const void *buffer_in,
+ int buffer_size, unsigned long len) {
+ char x;
+ int i;
+
+ /* buffer_size:
+ * 1 - int8_t;
+ * 2 - int16_t;
+ * 3 - int32_t;
+ * 4 - int64_t;
+ */
+ switch (buffer_size) {
+ case 1:
+ WRITE_BUFFER(int8_t)
+ break;
+ case 2:
+ WRITE_BUFFER(int16_t)
+ break;
+ case 4:
+ WRITE_BUFFER(int32_t)
+ break;
+ case 8:
+ WRITE_BUFFER(int64_t)
+ break;
+ default:
+ break;
+ }
+}
+}
+#undef WRITE_BUFFER
+
+/* Need a fixed size serializer for the track ID. libmkv provides a 64 bit
+ * one, but not a 32 bit one.
+ */
+static void Ebml_SerializeUnsigned32(EbmlGlobal *glob,
+ uint64_t class_id, uint64_t ui) {
+ unsigned char sizeSerialized = 4 | 0x80;
+ Ebml_WriteID(glob, class_id);
+ Ebml_Serialize(glob, &sizeSerialized, sizeof(sizeSerialized), 1ULL);
+ Ebml_Serialize(glob, &ui, sizeof(ui), 4ULL);
+}
+
+static void Ebml_StartSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc,
+ uint64_t class_id) {
+ // todo this is always taking 8 bytes, this may need later optimization
+ // this is a key that says length unknown
+ uint64_t unknownLen = LITERALU64(0x01FFFFFFFFFFFFFF);
+
+ Ebml_WriteID(glob, class_id);
+ *ebmlLoc = ftello(glob->stream);
+ Ebml_Serialize(glob, &unknownLen, sizeof(unknownLen), 8ULL);
+}
+
+static void Ebml_EndSubElement(EbmlGlobal *glob, EbmlLoc *ebmlLoc) {
+ off_t pos;
+ uint64_t size;
+
+ /* Save the current stream pointer */
+ pos = ftello(glob->stream);
+
+ /* Calculate the size of this element */
+ size = pos - *ebmlLoc - 8;
+ size |= LITERALU64(0x0100000000000000);
+
+ /* Seek back to the beginning of the element and write the new size */
+ fseeko(glob->stream, *ebmlLoc, SEEK_SET);
+ Ebml_Serialize(glob, &size, sizeof(size), 8ULL);
+
+ /* Reset the stream pointer */
+ fseeko(glob->stream, pos, SEEK_SET);
+}
+
+static void write_webm_seek_element(EbmlGlobal *ebml, uint64_t id, off_t pos) {
+ uint64_t offset = pos - ebml->position_reference;
+ EbmlLoc start;
+ Ebml_StartSubElement(ebml, &start, Seek);
+ Ebml_SerializeBinary(ebml, SeekID, id);
+ Ebml_SerializeUnsigned64(ebml, SeekPosition, offset);
+ Ebml_EndSubElement(ebml, &start);
+}
+
+static void write_webm_seek_info(EbmlGlobal *ebml) {
+ off_t pos;
+
+ /* Save the current stream pointer */
+ pos = ftello(ebml->stream);
+
+ if (ebml->seek_info_pos)
+ fseeko(ebml->stream, ebml->seek_info_pos, SEEK_SET);
+ else
+ ebml->seek_info_pos = pos;
+
+ {
+ EbmlLoc start;
+
+ Ebml_StartSubElement(ebml, &start, SeekHead);
+ write_webm_seek_element(ebml, Tracks, ebml->track_pos);
+ write_webm_seek_element(ebml, Cues, ebml->cue_pos);
+ write_webm_seek_element(ebml, Info, ebml->segment_info_pos);
+ Ebml_EndSubElement(ebml, &start);
+ }
+ {
+ // segment info
+ EbmlLoc startInfo;
+ uint64_t frame_time = 45; //approx. the duration of a single frame (in ms).
+ char version_string[64];
+
+ /* Assemble version string */
+ strcpy(version_string, "vpxenc ");
+ strncat(version_string,
+ vpx_codec_version_str(),
+ sizeof(version_string) - 1 - strlen(version_string));
+
+ ebml->segment_info_pos = ftello(ebml->stream);
+ Ebml_StartSubElement(ebml, &startInfo, Info);
+ Ebml_SerializeUnsigned(ebml, TimecodeScale, 1000000);
+ Ebml_SerializeFloat(ebml, Segment_Duration,
+ ebml->last_pts_ms + frame_time);
+ Ebml_SerializeString(ebml, MuxingApp, version_string);
+ Ebml_SerializeString(ebml, WritingApp, version_string);
+ Ebml_EndSubElement(ebml, &startInfo);
+ }
+}
+
+FUNC(void, writeWebmFileHeader, jlong jglob,
+ jint width, jint height) {
+ EbmlGlobal *glob = reinterpret_cast<EbmlGlobal*>(jglob);
+ stereo_format_t stereo_fmt = STEREO_FORMAT_MONO;
+
+ EbmlLoc start;
+ Ebml_StartSubElement(glob, &start, EBML);
+ Ebml_SerializeUnsigned(glob, EBMLVersion, 1);
+ Ebml_SerializeUnsigned(glob, EBMLReadVersion, 1); // EBML Read Version
+ Ebml_SerializeUnsigned(glob, EBMLMaxIDLength, 4); // EBML Max ID Length
+ Ebml_SerializeUnsigned(glob, EBMLMaxSizeLength, 8); // EBML Max Size Length
+ Ebml_SerializeString(glob, DocType, "webm"); // Doc Type
+ Ebml_SerializeUnsigned(glob, DocTypeVersion, 2); // Doc Type Version
+ Ebml_SerializeUnsigned(glob, DocTypeReadVersion, 2); // Doc Type Read Version
+ Ebml_EndSubElement(glob, &start);
+
+ {
+ Ebml_StartSubElement(glob, &glob->startSegment, Segment); // segment
+ glob->position_reference = ftello(glob->stream);
+ write_webm_seek_info(glob);
+
+ {
+ EbmlLoc trackStart;
+ glob->track_pos = ftello(glob->stream);
+ Ebml_StartSubElement(glob, &trackStart, Tracks);
+ {
+ unsigned int trackNumber = 1;
+ uint64_t trackID = 0;
+
+ EbmlLoc start;
+ Ebml_StartSubElement(glob, &start, TrackEntry);
+ Ebml_SerializeUnsigned(glob, TrackNumber, trackNumber);
+ glob->track_id_pos = ftello(glob->stream);
+ Ebml_SerializeUnsigned32(glob, TrackUID, trackID);
+ Ebml_SerializeUnsigned(glob, TrackType, 1); // video is always 1
+ Ebml_SerializeString(glob, CodecID, "V_VP8");
+ {
+ unsigned int pixelWidth = width;
+ unsigned int pixelHeight = height;
+
+ EbmlLoc videoStart;
+ Ebml_StartSubElement(glob, &videoStart, Video);
+ Ebml_SerializeUnsigned(glob, PixelWidth, pixelWidth);
+ Ebml_SerializeUnsigned(glob, PixelHeight, pixelHeight);
+ Ebml_SerializeUnsigned(glob, StereoMode, stereo_fmt);
+ //Ebml_SerializeFloat(glob, FrameRate, frameRate);
+ Ebml_EndSubElement(glob, &videoStart); // Video
+ }
+ Ebml_EndSubElement(glob, &start); // Track Entry
+ }
+ Ebml_EndSubElement(glob, &trackStart);
+ }
+ // segment element is open
+ }
+}
+
+FUNC(void, writeWebmBlock, jlong jglob, jobject jfd) {
+ EbmlGlobal *glob = reinterpret_cast<EbmlGlobal*>(jglob);
+
+ jclass frameDescriptor = env->FindClass("org/jitsi/impl/neomedia/recording/WebmWriter$FrameDescriptor");
+ assert(frameDescriptor != NULL);
+
+ jfieldID bufferId = env->GetFieldID(frameDescriptor, "buffer", "[B");
+ assert(bufferId != NULL);
+
+ jfieldID offsetId = env->GetFieldID(frameDescriptor, "offset", "I");
+ assert(offsetId != NULL);
+
+ jfieldID lengthId = env->GetFieldID(frameDescriptor, "length", "J");
+ assert(lengthId != NULL);
+
+ jfieldID flagsId = env->GetFieldID(frameDescriptor, "flags", "I");
+ assert(flagsId != NULL);
+
+ jfieldID ptsId = env->GetFieldID(frameDescriptor, "pts", "J");
+ assert(ptsId != NULL);
+
+ jobject jba = env->GetObjectField(jfd, bufferId);
+ assert(jba != NULL);
+
+ jint offset = env->GetIntField(jfd, offsetId);
+
+ jint frameFlags = env->GetIntField(jfd, flagsId);
+
+ uint64_t block_length;
+ unsigned char track_number;
+ uint16_t block_timecode = 0;
+ unsigned char flags;
+ int64_t pts_ms;
+ int start_cluster = 0, is_keyframe;
+
+ /* Calculate the PTS of this frame in milliseconds */
+ pts_ms = env->GetLongField(jfd, ptsId);
+ if (pts_ms <= glob->last_pts_ms)
+ pts_ms = glob->last_pts_ms + 1;
+ glob->last_pts_ms = pts_ms;
+
+ /* Calculate the relative time of this block */
+ if (pts_ms - glob->cluster_timecode > SHRT_MAX)
+ start_cluster = 1;
+ else
+ block_timecode = pts_ms - glob->cluster_timecode;
+
+ is_keyframe = (frameFlags & VPX_FRAME_IS_KEY);
+ if (start_cluster || is_keyframe) {
+ if (glob->cluster_open)
+ Ebml_EndSubElement(glob, &glob->startCluster);
+
+ /* Open the new cluster */
+ block_timecode = 0;
+ glob->cluster_open = 1;
+ glob->cluster_timecode = pts_ms;
+ glob->cluster_pos = ftello(glob->stream);
+ Ebml_StartSubElement(glob, &glob->startCluster, Cluster); // cluster
+ Ebml_SerializeUnsigned(glob, Timecode, glob->cluster_timecode);
+
+ /* Save a cue point if this is a keyframe. */
+ if (is_keyframe) {
+ struct cue_entry *cue, *new_cue_list;
+
+ new_cue_list = reinterpret_cast<cue_entry*>(realloc(glob->cue_list,
+ (glob->cues+1) * sizeof(struct cue_entry)));
+ if (new_cue_list) {
+ glob->cue_list = new_cue_list;
+ } else {
+ // TODO(frkoenig) : Handle this error better/correctly
+ fprintf(stderr, "\nFailed to realloc cue list.\n");
+ exit(EXIT_FAILURE);
+ }
+
+ cue = &glob->cue_list[glob->cues];
+ cue->time = glob->cluster_timecode;
+ cue->loc = glob->cluster_pos;
+ glob->cues++;
+ }
+ }
+
+ /* Write the Simple Block */
+ Ebml_WriteID(glob, SimpleBlock);
+
+ jlong frameSz = env->GetLongField(jfd, lengthId);
+
+ block_length = frameSz + 4;
+ block_length |= 0x10000000;
+ Ebml_Serialize(glob, &block_length, sizeof(block_length), 4ULL);
+
+ track_number = 1;
+ track_number |= 0x80;
+ Ebml_Write(glob, &track_number, 1ULL);
+
+ Ebml_Serialize(glob, &block_timecode, sizeof(block_timecode), 2ULL);
+
+ flags = 0;
+ if (is_keyframe)
+ flags |= 0x80;
+ if (frameFlags & VPX_FRAME_IS_INVISIBLE)
+ flags |= 0x08;
+ Ebml_Write(glob, &flags, 1ULL);
+
+ jbyte *frameBuf = env->GetByteArrayElements((jbyteArray)jba, 0);
+
+ Ebml_Write(glob, frameBuf + offset, static_cast<uint64_t>(frameSz));
+
+ env->ReleaseByteArrayElements((jbyteArray)jba, frameBuf, 0);
+}
+
+FUNC(void, writeWebmFileFooter, jlong jglob, jlong hash) {
+ EbmlGlobal *glob = reinterpret_cast<EbmlGlobal*>(jglob);
+
+ //1
+ if (glob->cluster_open)
+ Ebml_EndSubElement(glob, &glob->startCluster);
+
+ {
+ EbmlLoc start;
+ unsigned int i;
+
+ glob->cue_pos = ftello(glob->stream);
+ Ebml_StartSubElement(glob, &start, Cues);
+ //2
+ for (i = 0; i < glob->cues; i++) {
+ struct cue_entry *cue = &glob->cue_list[i];
+ EbmlLoc start;
+
+ Ebml_StartSubElement(glob, &start, CuePoint);
+ {
+ EbmlLoc start;
+
+ Ebml_SerializeUnsigned(glob, CueTime, cue->time);
+
+ Ebml_StartSubElement(glob, &start, CueTrackPositions);
+ Ebml_SerializeUnsigned(glob, CueTrack, 1);
+ Ebml_SerializeUnsigned64(glob, CueClusterPosition,
+ cue->loc - glob->position_reference);
+ // Ebml_SerializeUnsigned(glob, CueBlockNumber, cue->blockNumber);
+ Ebml_EndSubElement(glob, &start);
+ }
+ Ebml_EndSubElement(glob, &start);
+ }
+ Ebml_EndSubElement(glob, &start);
+ }
+
+ Ebml_EndSubElement(glob, &glob->startSegment);
+
+ /* Patch up the seek info block */
+ write_webm_seek_info(glob);
+
+ /* Patch up the track id */
+ fseeko(glob->stream, glob->track_id_pos, SEEK_SET);
+ Ebml_SerializeUnsigned32(glob, TrackUID, hash);
+
+ fseeko(glob->stream, 0, SEEK_END);
+}
diff --git a/src/org/jitsi/impl/neomedia/recording/WebmWriter.java b/src/org/jitsi/impl/neomedia/recording/WebmWriter.java
new file mode 100644
index 0000000000000000000000000000000000000000..c3b930ada7b83ddc5dd908b8f8ff050889cdc4b4
--- /dev/null
+++ b/src/org/jitsi/impl/neomedia/recording/WebmWriter.java
@@ -0,0 +1,78 @@
+package org.jitsi.impl.neomedia.recording;
+
+import java.io.*;
+
+public class WebmWriter
+{
+ static
+ {
+ System.loadLibrary("jnvpx");
+ }
+
+ /**
+ * Constant corresponding to <tt>VPX_FRAME_IS_KEY</tt> from libvpx's
+ * <tt>vpx/vpx_encoder.h</tt>
+ */
+ public static int FLAG_FRAME_IS_KEY = 0x01;
+
+ /**
+ * Constant corresponding to <tt>VPX_FRAME_IS_INVISIBLE</tt> from libvpx's
+ * <tt>vpx/vpx_encoder.h</tt>
+ */
+ public static int FLAG_FRAME_IS_INVISIBLE = 0x04;
+
+ private long glob;
+
+ private native long allocCfg();
+
+ /**
+ * Free-s <tt>glob</tt> and closes the file opened for writing.
+ * @param glob
+ */
+ private native void freeCfg(long glob);
+
+ private native boolean openFile(long glob, String fileName);
+ private native void writeWebmFileHeader(long glob, int width, int height);
+ public void writeWebmFileHeader(int width, int height)
+ {
+ writeWebmFileHeader(glob, width, height);
+ }
+ private native void writeWebmBlock(long glob, FrameDescriptor fd);
+ private native void writeWebmFileFooter(long glob, long hash);
+
+ public WebmWriter(String filename)
+ throws IOException
+ {
+ glob = allocCfg();
+
+ if (glob == 0)
+ {
+ throw new IOException("allocCfg() failed");
+ }
+
+ if (openFile(glob, filename))
+ {
+ throw new IOException("Can not open " + filename + " for writing");
+ }
+ }
+
+ public void close()
+ {
+ writeWebmFileFooter(glob, 0);
+ freeCfg(glob); //also closes the file
+ }
+
+ public void writeFrame(FrameDescriptor fd)
+ {
+ writeWebmBlock(glob, fd);
+ }
+
+ public static class FrameDescriptor
+ {
+ public byte[] buffer;
+ public int offset;
+ public long length;
+ public long pts;
+ public int flags;
+ }
+}