am 5a65a6e2: Added a .amr file extractor (for AMR-NB and AMR-WB content). (c32e8762) · Commits · e / os / android_frameworks_av

include/media/stagefright/AMRExtractor.h

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		/*
		* Copyright (C) 2009 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.
		*/

		#ifndef AMR_EXTRACTOR_H_

		#define AMR_EXTRACTOR_H_

		#include <media/stagefright/MediaExtractor.h>

		namespace android {

		class String8;

		class AMRExtractor : public MediaExtractor {
		public:
		AMRExtractor(const sp<DataSource> &source);

		virtual size_t countTracks();
		virtual sp<MediaSource> getTrack(size_t index);
		virtual sp<MetaData> getTrackMetaData(size_t index);

		static sp<MetaData> makeAMRFormat(bool isWide);

		protected:
		virtual ~AMRExtractor();

		private:
		sp<DataSource> mDataSource;
		status_t mInitCheck;
		bool mIsWide;

		AMRExtractor(const AMRExtractor &);
		AMRExtractor &operator=(const AMRExtractor &);
		};

		bool SniffAMR(
		const sp<DataSource> &source, String8 mimeType, float confidence);

		} // namespace android

		#endif // AMR_EXTRACTOR_H_

include/media/stagefright/MP3Extractor.h

+3 −3

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		@@ -30,9 +30,9 @@ public:
		// Extractor assumes ownership of "source".
		MP3Extractor(const sp<DataSource> &source);

		size_t countTracks();
		sp<MediaSource> getTrack(size_t index);
		sp<MetaData> getTrackMetaData(size_t index);
		virtual size_t countTracks();
		virtual sp<MediaSource> getTrack(size_t index);
		virtual sp<MetaData> getTrackMetaData(size_t index);

		protected:
		virtual ~MP3Extractor();

media/libstagefright/AMRExtractor.cpp

0 → 100644

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		/*
		* Copyright (C) 2009 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.
		*/

		//#define LOG_NDEBUG 0
		#define LOG_TAG "AMRExtractor"
		#include <utils/Log.h>

		#include <media/stagefright/AMRExtractor.h>
		#include <media/stagefright/DataSource.h>
		#include <media/stagefright/MediaBufferGroup.h>
		#include <media/stagefright/MediaDebug.h>
		#include <media/stagefright/MediaErrors.h>
		#include <media/stagefright/MediaSource.h>
		#include <media/stagefright/MetaData.h>
		#include <utils/String8.h>

		namespace android {

		class AMRSource : public MediaSource {
		public:
		AMRSource(const sp<DataSource> &source, bool isWide);

		virtual status_t start(MetaData *params = NULL);
		virtual status_t stop();

		virtual sp<MetaData> getFormat();

		virtual status_t read(
		MediaBuffer *buffer, const ReadOptions options = NULL);

		protected:
		virtual ~AMRSource();

		private:
		sp<DataSource> mDataSource;
		bool mIsWide;

		off_t mOffset;
		int64_t mCurrentTimeUs;
		bool mStarted;
		MediaBufferGroup *mGroup;

		AMRSource(const AMRSource &);
		AMRSource &operator=(const AMRSource &);
		};

		////////////////////////////////////////////////////////////////////////////////

		AMRExtractor::AMRExtractor(const sp<DataSource> &source)
		: mDataSource(source),
		mInitCheck(NO_INIT) {
		String8 mimeType;
		float confidence;
		if (SniffAMR(mDataSource, &mimeType, &confidence)) {
		mInitCheck = OK;
		mIsWide = (mimeType == "audio/amr-wb");
		}
		}

		AMRExtractor::~AMRExtractor() {
		}

		size_t AMRExtractor::countTracks() {
		return mInitCheck == OK ? 1 : 0;
		}

		sp<MediaSource> AMRExtractor::getTrack(size_t index) {
		if (mInitCheck != OK \|\| index != 0) {
		return NULL;
		}

		return new AMRSource(mDataSource, mIsWide);
		}

		sp<MetaData> AMRExtractor::getTrackMetaData(size_t index) {
		if (mInitCheck != OK \|\| index != 0) {
		return NULL;
		}

		return makeAMRFormat(mIsWide);
		}

		// static
		sp<MetaData> AMRExtractor::makeAMRFormat(bool isWide) {
		sp<MetaData> meta = new MetaData;
		meta->setCString(kKeyMIMEType, isWide ? "audio/amr-wb" : "audio/3gpp");
		meta->setInt32(kKeyChannelCount, 1);
		meta->setInt32(kKeySampleRate, isWide ? 16000 : 8000);

		return meta;
		}

		////////////////////////////////////////////////////////////////////////////////

		AMRSource::AMRSource(const sp<DataSource> &source, bool isWide)
		: mDataSource(source),
		mIsWide(isWide),
		mOffset(mIsWide ? 9 : 6),
		mCurrentTimeUs(0),
		mStarted(false),
		mGroup(NULL) {
		}

		AMRSource::~AMRSource() {
		if (mStarted) {
		stop();
		}
		}

		status_t AMRSource::start(MetaData *params) {
		CHECK(!mStarted);

		mOffset = mIsWide ? 9 : 6;
		mCurrentTimeUs = 0;
		mGroup = new MediaBufferGroup;
		mGroup->add_buffer(new MediaBuffer(128));
		mStarted = true;

		return OK;
		}

		status_t AMRSource::stop() {
		CHECK(mStarted);

		delete mGroup;
		mGroup = NULL;

		mStarted = false;
		return OK;
		}

		sp<MetaData> AMRSource::getFormat() {
		return AMRExtractor::makeAMRFormat(mIsWide);
		}

		status_t AMRSource::read(
		MediaBuffer *out, const ReadOptions options) {
		*out = NULL;

		uint8_t header;
		ssize_t n = mDataSource->read_at(mOffset, &header, 1);

		if (n < 1) {
		return ERROR_IO;
		}

		MediaBuffer *buffer;
		status_t err = mGroup->acquire_buffer(&buffer);
		if (err != OK) {
		return err;
		}

		if (header & 0x83) {
		// Padding bits must be 0.

		return ERROR_MALFORMED;
		}

		unsigned FT = (header >> 3) & 0x0f;

		if (FT > 8 \|\| (!mIsWide && FT > 7)) {
		return ERROR_MALFORMED;
		}

		static const size_t kFrameSizeNB[8] = {
		95, 103, 118, 134, 148, 159, 204, 244
		};
		static const size_t kFrameSizeWB[9] = {
		132, 177, 253, 285, 317, 365, 397, 461, 477
		};

		size_t frameSize = mIsWide ? kFrameSizeWB[FT] : kFrameSizeNB[FT];

		// Round up bits to bytes and add 1 for the header byte.
		frameSize = (frameSize + 7) / 8 + 1;

		n = mDataSource->read_at(mOffset, buffer->data(), frameSize);

		if (n != (ssize_t)frameSize) {
		buffer->release();
		buffer = NULL;

		return ERROR_IO;
		}

		buffer->set_range(0, frameSize);
		buffer->meta_data()->setInt32(
		kKeyTimeUnits, (mCurrentTimeUs + 500) / 1000);
		buffer->meta_data()->setInt32(
		kKeyTimeScale, 1000);

		mOffset += frameSize;
		mCurrentTimeUs += 20000; // Each frame is 20ms

		*out = buffer;

		return OK;
		}

		////////////////////////////////////////////////////////////////////////////////

		bool SniffAMR(
		const sp<DataSource> &source, String8 mimeType, float confidence) {
		char header[9];

		if (source->read_at(0, header, sizeof(header)) != sizeof(header)) {
		return false;
		}

		if (!memcmp(header, "#!AMR\n", 6)) {
		*mimeType = "audio/3gpp";
		*confidence = 0.5;

		return true;
		} else if (!memcmp(header, "#!AMR-WB\n", 9)) {
		*mimeType = "audio/amr-wb";
		*confidence = 0.5;

		return true;
		}

		return false;
		}

		} // namespace android

media/libstagefright/Android.mk

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		@@ -2,6 +2,7 @@ LOCAL_PATH:= $(call my-dir)
		include $(CLEAR_VARS)

		LOCAL_SRC_FILES:= \
		AMRExtractor.cpp \
		CachingDataSource.cpp \
		DataSource.cpp \
		FileSource.cpp \

media/libstagefright/DataSource.cpp

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		@@ -14,6 +14,7 @@
		* limitations under the License.
		*/

		#include <media/stagefright/AMRExtractor.h>
		#include <media/stagefright/DataSource.h>
		#include <media/stagefright/MediaErrors.h>
		#include <media/stagefright/MP3Extractor.h>
		@@ -84,6 +85,7 @@ void DataSource::RegisterSniffer(SnifferFunc func) {
		void DataSource::RegisterDefaultSniffers() {
		RegisterSniffer(SniffMP3);
		RegisterSniffer(SniffMPEG4);
		RegisterSniffer(SniffAMR);
		}

		} // namespace android