From dacaa73ae5010b66f4224d70a520945e5b653544 Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Mon, 7 Dec 2009 09:56:32 -0800
Subject: Initial check in of stagefright software AAC decoder based on PV
 source code.

---
 media/libstagefright/codecs/aacdec/AACDecoder.cpp | 202 ++++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 media/libstagefright/codecs/aacdec/AACDecoder.cpp

(limited to 'media/libstagefright/codecs/aacdec/AACDecoder.cpp')

diff --git a/media/libstagefright/codecs/aacdec/AACDecoder.cpp b/media/libstagefright/codecs/aacdec/AACDecoder.cpp
new file mode 100644
index 0000000..03ac88d
--- /dev/null
+++ b/media/libstagefright/codecs/aacdec/AACDecoder.cpp
@@ -0,0 +1,202 @@
+#include "AACDecoder.h"
+
+#include "../../include/ESDS.h"
+
+#include "pvmp4audiodecoder_api.h"
+
+#include <media/stagefright/MediaBufferGroup.h>
+#include <media/stagefright/MediaDebug.h>
+#include <media/stagefright/MediaDefs.h>
+#include <media/stagefright/MetaData.h>
+
+namespace android {
+
+AACDecoder::AACDecoder(const sp<MediaSource> &source)
+    : mSource(source),
+      mStarted(false),
+      mBufferGroup(NULL),
+      mConfig(new tPVMP4AudioDecoderExternal),
+      mDecoderBuf(NULL),
+      mLastSeekTimeUs(0),
+      mNumSamplesOutput(0),
+      mInputBuffer(NULL) {
+}
+
+AACDecoder::~AACDecoder() {
+    if (mStarted) {
+        stop();
+    }
+
+    delete mConfig;
+    mConfig = NULL;
+}
+
+status_t AACDecoder::start(MetaData *params) {
+    CHECK(!mStarted);
+
+    mBufferGroup = new MediaBufferGroup;
+    mBufferGroup->add_buffer(new MediaBuffer(2048 * 2));
+
+    mConfig->outputFormat = OUTPUTFORMAT_16PCM_INTERLEAVED;
+    mConfig->aacPlusUpsamplingFactor = 0;
+    mConfig->aacPlusEnabled = false;
+
+    int32_t numChannels;
+    CHECK(mSource->getFormat()->findInt32(kKeyChannelCount, &numChannels));
+    mConfig->desiredChannels = numChannels;
+
+    UInt32 memRequirements = PVMP4AudioDecoderGetMemRequirements();
+    mDecoderBuf = malloc(memRequirements);
+
+    CHECK_EQ(PVMP4AudioDecoderInitLibrary(mConfig, mDecoderBuf),
+             MP4AUDEC_SUCCESS);
+
+    uint32_t type;
+    const void *data;
+    size_t size;
+    if (mSource->getFormat()->findData(kKeyESDS, &type, &data, &size)) {
+        ESDS esds((const char *)data, size);
+        CHECK_EQ(esds.InitCheck(), OK);
+
+        const void *codec_specific_data;
+        size_t codec_specific_data_size;
+        esds.getCodecSpecificInfo(
+                &codec_specific_data, &codec_specific_data_size);
+
+        mConfig->pInputBuffer = (UChar *)codec_specific_data;
+        mConfig->inputBufferCurrentLength = codec_specific_data_size;
+        mConfig->inputBufferMaxLength = 0;
+        mConfig->inputBufferUsedLength = 0;
+        mConfig->remainderBits = 0;
+
+        mConfig->pOutputBuffer = NULL;
+        mConfig->pOutputBuffer_plus = NULL;
+        mConfig->repositionFlag = false;
+
+        CHECK_EQ(PVMP4AudioDecoderConfig(mConfig, mDecoderBuf),
+                 MP4AUDEC_SUCCESS);
+    }
+
+    mSource->start();
+
+    mLastSeekTimeUs = 0;
+    mNumSamplesOutput = 0;
+    mStarted = true;
+
+    return OK;
+}
+
+status_t AACDecoder::stop() {
+    CHECK(mStarted);
+
+    if (mInputBuffer) {
+        mInputBuffer->release();
+        mInputBuffer = NULL;
+    }
+
+    free(mDecoderBuf);
+    mDecoderBuf = NULL;
+
+    delete mBufferGroup;
+    mBufferGroup = NULL;
+
+    mSource->stop();
+
+    mStarted = false;
+
+    return OK;
+}
+
+sp<MetaData> AACDecoder::getFormat() {
+    sp<MetaData> srcFormat = mSource->getFormat();
+
+    int32_t numChannels;
+    int32_t sampleRate;
+    CHECK(srcFormat->findInt32(kKeyChannelCount, &numChannels));
+    CHECK(srcFormat->findInt32(kKeySampleRate, &sampleRate));
+
+    sp<MetaData> meta = new MetaData;
+    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
+    meta->setInt32(kKeyChannelCount, numChannels);
+    meta->setInt32(kKeySampleRate, sampleRate);
+
+    return meta;
+}
+
+status_t AACDecoder::read(
+        MediaBuffer **out, const ReadOptions *options) {
+    status_t err;
+
+    *out = NULL;
+
+    int64_t seekTimeUs;
+    if (options && options->getSeekTo(&seekTimeUs)) {
+        CHECK(seekTimeUs >= 0);
+
+        mNumSamplesOutput = 0;
+
+        if (mInputBuffer) {
+            mInputBuffer->release();
+            mInputBuffer = NULL;
+        }
+    } else {
+        seekTimeUs = -1;
+    }
+
+    if (mInputBuffer == NULL) {
+        err = mSource->read(&mInputBuffer, options);
+
+        if (err != OK) {
+            return err;
+        }
+
+        if (seekTimeUs >= 0) {
+            CHECK(mInputBuffer->meta_data()->findInt64(
+                        kKeyTime, &mLastSeekTimeUs));
+
+            mNumSamplesOutput = 0;
+        }
+    }
+
+    MediaBuffer *buffer;
+    CHECK_EQ(mBufferGroup->acquire_buffer(&buffer), OK);
+
+    mConfig->pInputBuffer =
+        (UChar *)mInputBuffer->data() + mInputBuffer->range_offset();
+
+    mConfig->inputBufferCurrentLength = mInputBuffer->range_length();
+    mConfig->inputBufferMaxLength = 0;
+    mConfig->inputBufferUsedLength = 0;
+    mConfig->remainderBits = 0;
+
+    mConfig->pOutputBuffer = static_cast<Int16 *>(buffer->data());
+    mConfig->pOutputBuffer_plus = NULL;
+    mConfig->repositionFlag = false;
+
+    CHECK_EQ(PVMP4AudioDecodeFrame(mConfig, mDecoderBuf), MP4AUDEC_SUCCESS);
+
+    buffer->set_range(
+            0, mConfig->frameLength * sizeof(int16_t) * mConfig->desiredChannels);
+
+    mInputBuffer->set_range(
+            mInputBuffer->range_offset() + mConfig->inputBufferUsedLength,
+            mInputBuffer->range_length() - mConfig->inputBufferUsedLength);
+
+    if (mInputBuffer->range_length() == 0) {
+        mInputBuffer->release();
+        mInputBuffer = NULL;
+    }
+
+    buffer->meta_data()->setInt64(
+            kKeyTime,
+            mLastSeekTimeUs
+                + (mNumSamplesOutput * 1000000) / mConfig->samplingRate);
+
+    mNumSamplesOutput += mConfig->frameLength;
+
+    *out = buffer;
+
+    return OK;
+}
+
+}  // namespace android
-- 
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