Initial checkin of preliminary rtsp support for stagefright.

Change-Id: I0722aa888098c0c1361c97a4c1b123d910afc207

1 files changed, 166 insertions, 0 deletions

diff --git a/media/libstagefright/rtsp/AMPEG4AudioAssembler.cpp b/media/libstagefright/rtsp/AMPEG4AudioAssembler.cpp
new file mode 100644
index 0000000..0549d84
--- /dev/null
+++ b/media/libstagefright/rtsp/AMPEG4AudioAssembler.cpp
@@ -0,0 +1,166 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "AMPEG4AudioAssembler.h"
+
+#include "ARTPSource.h"
+
+#include <media/stagefright/foundation/ABuffer.h>
+#include <media/stagefright/foundation/ADebug.h>
+#include <media/stagefright/foundation/AMessage.h>
+
+namespace android {
+
+AMPEG4AudioAssembler::AMPEG4AudioAssembler(const sp<AMessage> &notify)
+    : mNotifyMsg(notify),
+      mAccessUnitRTPTime(0),
+      mNextExpectedSeqNoValid(false),
+      mNextExpectedSeqNo(0),
+      mAccessUnitDamaged(false) {
+}
+
+AMPEG4AudioAssembler::~AMPEG4AudioAssembler() {
+}
+
+ARTPAssembler::AssemblyStatus AMPEG4AudioAssembler::assembleMore(
+        const sp<ARTPSource> &source) {
+    AssemblyStatus status = addPacket(source);
+    if (status == MALFORMED_PACKET) {
+        mAccessUnitDamaged = true;
+    }
+    return status;
+}
+
+ARTPAssembler::AssemblyStatus AMPEG4AudioAssembler::addPacket(
+        const sp<ARTPSource> &source) {
+    List<sp<ABuffer> > *queue = source->queue();
+
+    if (queue->empty()) {
+        return NOT_ENOUGH_DATA;
+    }
+
+    if (mNextExpectedSeqNoValid) {
+        List<sp<ABuffer> >::iterator it = queue->begin();
+        while (it != queue->end()) {
+            if ((uint32_t)(*it)->int32Data() >= mNextExpectedSeqNo) {
+                break;
+            }
+
+            it = queue->erase(it);
+        }
+
+        if (queue->empty()) {
+            return NOT_ENOUGH_DATA;
+        }
+    }
+
+    sp<ABuffer> buffer = *queue->begin();
+
+    if (!mNextExpectedSeqNoValid) {
+        mNextExpectedSeqNoValid = true;
+        mNextExpectedSeqNo = (uint32_t)buffer->int32Data();
+    } else if ((uint32_t)buffer->int32Data() != mNextExpectedSeqNo) {
+#if VERBOSE
+        LOG(VERBOSE) << "Not the sequence number I expected";
+#endif
+
+        return WRONG_SEQUENCE_NUMBER;
+    }
+
+    uint32_t rtpTime;
+    CHECK(buffer->meta()->findInt32("rtp-time", (int32_t *)&rtpTime));
+
+    if (mPackets.size() > 0 && rtpTime != mAccessUnitRTPTime) {
+        submitAccessUnit();
+    }
+    mAccessUnitRTPTime = rtpTime;
+
+    mPackets.push_back(buffer);
+
+    queue->erase(queue->begin());
+    ++mNextExpectedSeqNo;
+
+    return OK;
+}
+
+void AMPEG4AudioAssembler::submitAccessUnit() {
+    CHECK(!mPackets.empty());
+
+#if VERBOSE
+    LOG(VERBOSE) << "Access unit complete (" << mPackets.size() << " packets)";
+#endif
+
+    uint64_t ntpTime;
+    CHECK((*mPackets.begin())->meta()->findInt64(
+                "ntp-time", (int64_t *)&ntpTime));
+
+    size_t totalSize = 0;
+    List<sp<ABuffer> >::iterator it = mPackets.begin();
+    while (it != mPackets.end()) {
+        const sp<ABuffer> &unit = *it;
+
+        size_t n = 0;
+        while (unit->data()[n] == 0xff) {
+            ++n;
+        }
+        ++n;
+
+        totalSize += unit->size() - n;
+        ++it;
+    }
+
+    sp<ABuffer> accessUnit = new ABuffer(totalSize);
+    size_t offset = 0;
+    it = mPackets.begin();
+    while (it != mPackets.end()) {
+        const sp<ABuffer> &unit = *it;
+
+        size_t n = 0;
+        while (unit->data()[n] == 0xff) {
+            ++n;
+        }
+        ++n;
+
+        memcpy((uint8_t *)accessUnit->data() + offset,
+               unit->data() + n, unit->size() - n);
+
+        offset += unit->size() - n;
+
+        ++it;
+    }
+
+    accessUnit->meta()->setInt64("ntp-time", ntpTime);
+
+    if (mAccessUnitDamaged) {
+        accessUnit->meta()->setInt32("damaged", true);
+    }
+
+    mPackets.clear();
+    mAccessUnitDamaged = false;
+
+    sp<AMessage> msg = mNotifyMsg->dup();
+    msg->setObject("access-unit", accessUnit);
+    msg->post();
+}
+
+void AMPEG4AudioAssembler::packetLost() {
+    CHECK(mNextExpectedSeqNoValid);
+    ++mNextExpectedSeqNo;
+
+    mAccessUnitDamaged = true;
+}
+
+}  // namespace android