Initial checkin of AudioSource and AMRWriter, a pair of classes supporting pure-audio recording in stagefright.
related-to-bug: 2295449
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