Adds a WAVExtractor for 16-bit signed PCM audio wave files.

include/media/stagefright/MediaDefs.h

@@ -34,6 +34,7 @@ extern const char *MEDIA_MIMETYPE_AUDIO_AAC;
 extern const char *MEDIA_MIMETYPE_AUDIO_RAW;
 
 extern const char *MEDIA_MIMETYPE_CONTAINER_MPEG4;
+extern const char *MEDIA_MIMETYPE_CONTAINER_WAV;
 
 }  // namespace android
 

media/libstagefright/Android.mk

@@ -16,6 +16,7 @@ ifeq ($(BUILD_WITH_FULL_STAGEFRIGHT),true)
 
 LOCAL_SRC_FILES +=                \
         AMRExtractor.cpp          \
+        AudioPlayer.cpp           \
         CachingDataSource.cpp     \
         CameraSource.cpp          \
         DataSource.cpp            \
@@ -23,17 +24,17 @@ LOCAL_SRC_FILES +=                \
         HTTPDataSource.cpp        \
         HTTPStream.cpp            \
         JPEGSource.cpp            \
-        MediaExtractor.cpp        \
         MP3Extractor.cpp          \
         MPEG4Extractor.cpp        \
         MPEG4Writer.cpp           \
+        MediaExtractor.cpp        \
         MediaPlayerImpl.cpp       \
         MmapSource.cpp            \
         SampleTable.cpp           \
         ShoutcastSource.cpp       \
         TimeSource.cpp            \
         TimedEventQueue.cpp       \
-        AudioPlayer.cpp           \
+        WAVExtractor.cpp          \
         string.cpp
 
 endif

media/libstagefright/DataSource.cpp

@@ -17,6 +17,7 @@
 #include "include/AMRExtractor.h"
 #include "include/MP3Extractor.h"
 #include "include/MPEG4Extractor.h"
+#include "include/WAVExtractor.h"
 
 #include <media/stagefright/DataSource.h>
 #include <media/stagefright/MediaErrors.h>
@@ -87,6 +88,7 @@ void DataSource::RegisterDefaultSniffers() {
     RegisterSniffer(SniffMP3);
     RegisterSniffer(SniffMPEG4);
     RegisterSniffer(SniffAMR);
+    RegisterSniffer(SniffWAV);
 }
 
 }  // namespace android

media/libstagefright/MPEG4Extractor.cpp

@@ -1001,7 +1001,8 @@ bool SniffMPEG4(
     }
 
     if (!memcmp(header, "ftyp3gp", 7) || !memcmp(header, "ftypmp42", 8)
-        || !memcmp(header, "ftypisom", 8) || !memcmp(header, "ftypM4V ", 8)) {
+        || !memcmp(header, "ftypisom", 8) || !memcmp(header, "ftypM4V ", 8)
+        || !memcmp(header, "ftypM4A ", 8)) {
         *mimeType = MEDIA_MIMETYPE_CONTAINER_MPEG4;
         *confidence = 0.1;
 

media/libstagefright/MediaDefs.cpp

@@ -32,5 +32,6 @@ const char *MEDIA_MIMETYPE_AUDIO_AAC = "audio/mp4a-latm";
 const char *MEDIA_MIMETYPE_AUDIO_RAW = "audio/raw";
 
 const char *MEDIA_MIMETYPE_CONTAINER_MPEG4 = "video/mpeg4";
+const char *MEDIA_MIMETYPE_CONTAINER_WAV = "audio/wav";
 
 }  // namespace android

media/libstagefright/MediaExtractor.cpp

@@ -21,6 +21,7 @@
 #include "include/AMRExtractor.h"
 #include "include/MP3Extractor.h"
 #include "include/MPEG4Extractor.h"
+#include "include/WAVExtractor.h"
 
 #include <media/stagefright/CachingDataSource.h>
 #include <media/stagefright/DataSource.h>
@@ -57,6 +58,8 @@ sp<MediaExtractor> MediaExtractor::Create(
     } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
             || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
         return new AMRExtractor(source);
+    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
+        return new WAVExtractor(source);
     }
 
     return NULL;

media/libstagefright/WAVExtractor.cpp

@@ -0,0 +1,317 @@
+/*
+ * 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 "WAVExtractor"
+#include <utils/Log.h>
+
+#include "include/WAVExtractor.h"
+
+#include <media/stagefright/DataSource.h>
+#include <media/stagefright/MediaBufferGroup.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>
+#include <utils/String8.h>
+
+namespace android {
+
+static uint16_t WAVE_FORMAT_PCM = 1;
+
+static uint32_t U32_LE_AT(const uint8_t *ptr) {
+    return ptr[3] << 24 | ptr[2] << 16 | ptr[1] << 8 | ptr[0];
+}
+
+static uint16_t U16_LE_AT(const uint8_t *ptr) {
+    return ptr[1] << 8 | ptr[0];
+}
+
+struct WAVSource : public MediaSource {
+    WAVSource(
+            const sp<DataSource> &dataSource,
+            int32_t sampleRate, int32_t numChannels,
+            off_t offset, size_t size);
+
+    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 ~WAVSource();
+
+private:
+    static const size_t kMaxFrameSize;
+
+    sp<DataSource> mDataSource;
+    int32_t mSampleRate;
+    int32_t mNumChannels;
+    off_t mOffset;
+    size_t mSize;
+    bool mStarted;
+    MediaBufferGroup *mGroup;
+    off_t mCurrentPos;
+
+    WAVSource(const WAVSource &);
+    WAVSource &operator=(const WAVSource &);
+};
+
+WAVExtractor::WAVExtractor(const sp<DataSource> &source)
+    : mDataSource(source),
+      mValidFormat(false) {
+    mInitCheck = init();
+}
+
+WAVExtractor::~WAVExtractor() {
+}
+
+size_t WAVExtractor::countTracks() {
+    return mInitCheck == OK ? 1 : 0;
+}
+
+sp<MediaSource> WAVExtractor::getTrack(size_t index) {
+    if (mInitCheck != OK || index > 0) {
+        return NULL;
+    }
+
+    return new WAVSource(
+            mDataSource, mSampleRate, mNumChannels, mDataOffset, mDataSize);
+}
+
+sp<MetaData> WAVExtractor::getTrackMetaData(
+        size_t index, uint32_t flags) {
+    if (mInitCheck != OK || index > 0) {
+        return NULL;
+    }
+
+    sp<MetaData> meta = new MetaData;
+    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
+    meta->setInt32(kKeyChannelCount, mNumChannels);
+    meta->setInt32(kKeySampleRate, mSampleRate);
+
+    int64_t durationUs =
+        1000000LL * (mDataSize / (mNumChannels * 2)) / mSampleRate;
+
+    meta->setInt64(kKeyDuration, durationUs);
+
+    return meta;
+}
+
+status_t WAVExtractor::init() {
+    uint8_t header[12];
+    if (mDataSource->readAt(
+                0, header, sizeof(header)) < (ssize_t)sizeof(header)) {
+        return NO_INIT;
+    }
+
+    if (memcmp(header, "RIFF", 4) || memcmp(&header[8], "WAVE", 4)) {
+        return NO_INIT;
+    }
+
+    size_t totalSize = U32_LE_AT(&header[4]);
+
+    off_t offset = 12;
+    size_t remainingSize = totalSize;
+    while (remainingSize >= 8) {
+        uint8_t chunkHeader[8];
+        if (mDataSource->readAt(offset, chunkHeader, 8) < 8) {
+            return NO_INIT;
+        }
+
+        remainingSize -= 8;
+        offset += 8;
+        
+        uint32_t chunkSize = U32_LE_AT(&chunkHeader[4]);
+
+        if (chunkSize > remainingSize) {
+            return NO_INIT;
+        }
+
+        if (!memcmp(chunkHeader, "fmt ", 4)) {
+            if (chunkSize < 16) {
+                return NO_INIT;
+            }
+
+            uint8_t formatSpec[16];
+            if (mDataSource->readAt(offset, formatSpec, 16) < 16) {
+                return NO_INIT;
+            }
+
+            uint16_t format = U16_LE_AT(formatSpec);
+            if (format != WAVE_FORMAT_PCM) {
+                return ERROR_UNSUPPORTED;
+            }
+
+            mNumChannels = U16_LE_AT(&formatSpec[2]);
+            if (mNumChannels != 1 && mNumChannels != 2) {
+                return ERROR_UNSUPPORTED;
+            }
+
+            mSampleRate = U32_LE_AT(&formatSpec[4]);
+
+            if (U16_LE_AT(&formatSpec[14]) != 16) {
+                return ERROR_UNSUPPORTED;
+            }
+
+            mValidFormat = true;
+        } else if (!memcmp(chunkHeader, "data", 4)) {
+            if (mValidFormat) {
+                mDataOffset = offset;
+                mDataSize = chunkSize;
+
+                return OK;
+            }
+        }
+
+        offset += chunkSize;
+    }
+
+    return NO_INIT;
+}
+
+const size_t WAVSource::kMaxFrameSize = 32768;
+
+WAVSource::WAVSource(
+        const sp<DataSource> &dataSource,
+        int32_t sampleRate, int32_t numChannels,
+        off_t offset, size_t size)
+    : mDataSource(dataSource),
+      mSampleRate(sampleRate),
+      mNumChannels(numChannels),
+      mOffset(offset),
+      mSize(size),
+      mStarted(false),
+      mGroup(NULL) {
+}
+
+WAVSource::~WAVSource() {
+    if (mStarted) {
+        stop();
+    }
+}
+
+status_t WAVSource::start(MetaData *params) {
+    LOGV("WAVSource::start");
+
+    CHECK(!mStarted);
+
+    mGroup = new MediaBufferGroup;
+    mGroup->add_buffer(new MediaBuffer(kMaxFrameSize));
+
+    mCurrentPos = mOffset;
+
+    mStarted = true;
+
+    return OK;
+}
+
+status_t WAVSource::stop() {
+    LOGV("WAVSource::stop");
+
+    CHECK(mStarted);
+
+    delete mGroup;
+    mGroup = NULL;
+
+    mStarted = false;
+
+    return OK;
+}
+
+sp<MetaData> WAVSource::getFormat() {
+    LOGV("WAVSource::getFormat");
+
+    sp<MetaData> meta = new MetaData;
+    meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_RAW);
+    meta->setInt32(kKeyChannelCount, mNumChannels);
+    meta->setInt32(kKeySampleRate, mSampleRate);
+
+    int64_t durationUs =
+        1000000LL * (mSize / (mNumChannels * 2)) / mSampleRate;
+
+    meta->setInt64(kKeyDuration, durationUs);
+
+    return meta;
+}
+
+status_t WAVSource::read(
+        MediaBuffer **out, const ReadOptions *options) {
+    *out = NULL;
+
+    int64_t seekTimeUs;
+    if (options != NULL && options->getSeekTo(&seekTimeUs)) {
+        int64_t pos = (seekTimeUs * mSampleRate) / 1000000 * mNumChannels * 2;
+        if (pos > mSize) {
+            pos = mSize;
+        }
+        mCurrentPos = pos + mOffset;
+    }
+
+    MediaBuffer *buffer;
+    status_t err = mGroup->acquire_buffer(&buffer);
+    if (err != OK) {
+        return err;
+    }
+
+    ssize_t n = mDataSource->readAt(
+            mCurrentPos, buffer->data(), kMaxFrameSize);
+
+    if (n <= 0) {
+        buffer->release();
+        buffer = NULL;
+
+        return ERROR_END_OF_STREAM;
+    }
+
+    mCurrentPos += n;
+
+    buffer->set_range(0, n);
+    buffer->meta_data()->setInt64(
+            kKeyTime,
+            1000000LL * (mCurrentPos - mOffset)
+                / (mNumChannels * 2) / mSampleRate);
+
+
+    *out = buffer;
+
+    return OK;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+bool SniffWAV(
+        const sp<DataSource> &source, String8 *mimeType, float *confidence) {
+    char header[12];
+    if (source->readAt(0, header, sizeof(header)) < (ssize_t)sizeof(header)) {
+        return false;
+    }
+
+    if (memcmp(header, "RIFF", 4) || memcmp(&header[8], "WAVE", 4)) {
+        return false;
+    }
+
+    *mimeType = MEDIA_MIMETYPE_CONTAINER_WAV;
+    *confidence = 0.3f;
+
+    return true;
+}
+
+}  // namespace android
+

media/libstagefright/include/WAVExtractor.h

@@ -0,0 +1,61 @@
+/*
+ * 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 WAV_EXTRACTOR_H_
+
+#define WAV_EXTRACTOR_H_
+
+#include <media/stagefright/MediaExtractor.h>
+
+namespace android {
+
+class DataSource;
+class String8;
+
+class WAVExtractor : public MediaExtractor {
+public:
+    // Extractor assumes ownership of "source".
+    WAVExtractor(const sp<DataSource> &source);
+
+    virtual size_t countTracks();
+    virtual sp<MediaSource> getTrack(size_t index);
+    virtual sp<MetaData> getTrackMetaData(size_t index, uint32_t flags);
+
+protected:
+    virtual ~WAVExtractor();
+
+private:
+    sp<DataSource> mDataSource;
+    status_t mInitCheck;
+    bool mValidFormat;
+    uint16_t mNumChannels;
+    uint32_t mSampleRate;
+    off_t mDataOffset;
+    size_t mDataSize;
+
+    status_t init();
+
+    WAVExtractor(const WAVExtractor &);
+    WAVExtractor &operator=(const WAVExtractor &);
+};
+
+bool SniffWAV(
+        const sp<DataSource> &source, String8 *mimeType, float *confidence);
+
+}  // namespace android
+
+#endif  // WAV_EXTRACTOR_H_
+