From e7c9cb48fec02697227bd847cd2e69432659adfd Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Mon, 25 Jan 2010 14:27:12 -0800
Subject: Initial checkin of AudioSource and AMRWriter, a pair of classes
 supporting pure-audio recording in stagefright.

related-to-bug: 2295449
---
 media/libstagefright/AMRWriter.cpp | 184 +++++++++++++++++++++++++++++++++++++
 1 file changed, 184 insertions(+)
 create mode 100644 media/libstagefright/AMRWriter.cpp

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

diff --git a/media/libstagefright/AMRWriter.cpp b/media/libstagefright/AMRWriter.cpp
new file mode 100644
index 0000000..7b681f1
--- /dev/null
+++ b/media/libstagefright/AMRWriter.cpp
@@ -0,0 +1,184 @@
+/*
+ * 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 <media/stagefright/AMRWriter.h>
+
+#include <media/stagefright/MediaBuffer.h>
+#include <media/stagefright/MediaDebug.h>
+#include <media/stagefright/MediaDefs.h>
+#include <media/stagefright/MediaErrors.h>
+#include <media/stagefright/MediaSource.h>
+#include <media/stagefright/MetaData.h>
+
+namespace android {
+
+AMRWriter::AMRWriter(const char *filename)
+    : mFile(fopen(filename, "wb")),
+      mInitCheck(mFile != NULL ? OK : NO_INIT),
+      mStarted(false) {
+}
+
+AMRWriter::AMRWriter(int fd)
+    : mFile(fdopen(fd, "wb")),
+      mInitCheck(mFile != NULL ? OK : NO_INIT),
+      mStarted(false) {
+}
+
+AMRWriter::~AMRWriter() {
+    if (mStarted) {
+        stop();
+    }
+
+    if (mFile != NULL) {
+        fclose(mFile);
+        mFile = NULL;
+    }
+}
+
+status_t AMRWriter::initCheck() const {
+    return mInitCheck;
+}
+
+status_t AMRWriter::addSource(const sp<MediaSource> &source) {
+    Mutex::Autolock autoLock(mLock);
+
+    if (mInitCheck != OK) {
+        return mInitCheck;
+    }
+
+    if (mSource != NULL) {
+        // AMR files only support a single track of audio.
+        return UNKNOWN_ERROR;
+    }
+
+    sp<MetaData> meta = source->getFormat();
+
+    const char *mime;
+    CHECK(meta->findCString(kKeyMIMEType, &mime));
+
+    bool isWide = false;
+    if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
+        isWide = true;
+    } else if (strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)) {
+        return ERROR_UNSUPPORTED;
+    }
+
+    int32_t channelCount;
+    int32_t sampleRate;
+    CHECK(meta->findInt32(kKeyChannelCount, &channelCount));
+    CHECK_EQ(channelCount, 1);
+    CHECK(meta->findInt32(kKeySampleRate, &sampleRate));
+    CHECK_EQ(sampleRate, (isWide ? 16000 : 8000));
+
+    mSource = source;
+
+    const char *kHeader = isWide ? "#!AMR-WB\n" : "#!AMR\n";
+    size_t n = strlen(kHeader);
+    if (fwrite(kHeader, 1, n, mFile) != n) {
+        return ERROR_IO;
+    }
+
+    return OK;
+}
+
+status_t AMRWriter::start() {
+    Mutex::Autolock autoLock(mLock);
+
+    if (mInitCheck != OK) {
+        return mInitCheck;
+    }
+
+    if (mStarted || mSource == NULL) {
+        return UNKNOWN_ERROR;
+    }
+
+    status_t err = mSource->start();
+
+    if (err != OK) {
+        return err;
+    }
+
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+
+    mDone = false;
+
+    pthread_create(&mThread, &attr, ThreadWrapper, this);
+    pthread_attr_destroy(&attr);
+
+    mStarted = true;
+
+    return OK;
+}
+
+void AMRWriter::stop() {
+    {
+        Mutex::Autolock autoLock(mLock);
+
+        if (!mStarted) {
+            return;
+        }
+
+        mDone = true;
+    }
+
+    void *dummy;
+    pthread_join(mThread, &dummy);
+
+    mSource->stop();
+
+    mStarted = false;
+}
+
+// static
+void *AMRWriter::ThreadWrapper(void *me) {
+    static_cast<AMRWriter *>(me)->threadFunc();
+
+    return NULL;
+}
+
+void AMRWriter::threadFunc() {
+    for (;;) {
+        Mutex::Autolock autoLock(mLock);
+
+        if (mDone) {
+            break;
+        }
+
+        MediaBuffer *buffer;
+        status_t err = mSource->read(&buffer);
+
+        if (err != OK) {
+            break;
+        }
+
+        ssize_t n = fwrite(
+                (const uint8_t *)buffer->data() + buffer->range_offset(),
+                1,
+                buffer->range_length(),
+                mFile);
+
+        buffer->release();
+        buffer = NULL;
+
+        if (n < (ssize_t)buffer->range_length()) {
+            break;
+        }
+    }
+}
+
+}  // namespace android
-- 
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