services/audiopolicy/managerdefault/Ports.h

/*
 * Copyright (C) 2015 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.
 */

namespace android {

class HwModule;

class AudioPort: public virtual RefBase
{
public:
    AudioPort(const String8& name, audio_port_type_t type,
            audio_port_role_t role, const sp<HwModule>& module);
    virtual ~AudioPort() {}

    audio_port_handle_t getHandle() { return mId; }

    void attach(const sp<HwModule>& module);
    bool isAttached() { return mId != 0; }

    virtual void toAudioPort(struct audio_port *port) const;

    void importAudioPort(const sp<AudioPort> port);
    void clearCapabilities();

    void loadSamplingRates(char *name);
    void loadFormats(char *name);
    void loadOutChannels(char *name);
    void loadInChannels(char *name);

    audio_gain_mode_t loadGainMode(char *name);
    void loadGain(cnode *root, int index);
    virtual void loadGains(cnode *root);

    // searches for an exact match
    status_t checkExactSamplingRate(uint32_t samplingRate) const;
    // searches for a compatible match, and returns the best match via updatedSamplingRate
    status_t checkCompatibleSamplingRate(uint32_t samplingRate,
            uint32_t *updatedSamplingRate) const;
    // searches for an exact match
    status_t checkExactChannelMask(audio_channel_mask_t channelMask) const;
    // searches for a compatible match, currently implemented for input channel masks only
    status_t checkCompatibleChannelMask(audio_channel_mask_t channelMask) const;
    status_t checkFormat(audio_format_t format) const;
    status_t checkGain(const struct audio_gain_config *gainConfig, int index) const;

    uint32_t pickSamplingRate() const;
    audio_channel_mask_t pickChannelMask() const;
    audio_format_t pickFormat() const;

    static const audio_format_t sPcmFormatCompareTable[];
    static int compareFormats(audio_format_t format1, audio_format_t format2);

    void dump(int fd, int spaces) const;

    String8           mName;
    audio_port_type_t mType;
    audio_port_role_t mRole;
    bool              mUseInChannelMask;
    // by convention, "0' in the first entry in mSamplingRates, mChannelMasks or mFormats
    // indicates the supported parameters should be read from the output stream
    // after it is opened for the first time
    Vector <uint32_t> mSamplingRates; // supported sampling rates
    Vector <audio_channel_mask_t> mChannelMasks; // supported channel masks
    Vector <audio_format_t> mFormats; // supported audio formats
    Vector < sp<AudioGain> > mGains; // gain controllers
    sp<HwModule> mModule;                 // audio HW module exposing this I/O stream
    uint32_t mFlags; // attribute flags (e.g primary output,
                     // direct output...).


protected:
    //TODO - clarify the role of mId in this case, both an "attached" indicator
    // and a unique ID for identifying a port to the (upcoming) selection API,
    // and its relationship to the mId in AudioOutputDescriptor and AudioInputDescriptor.
    audio_port_handle_t mId;
};

class AudioPortConfig: public virtual RefBase
{
public:
    AudioPortConfig();
    virtual ~AudioPortConfig() {}

    status_t applyAudioPortConfig(const struct audio_port_config *config,
            struct audio_port_config *backupConfig = NULL);
    virtual void toAudioPortConfig(struct audio_port_config *dstConfig,
            const struct audio_port_config *srcConfig = NULL) const = 0;
    virtual sp<AudioPort> getAudioPort() const = 0;
    uint32_t mSamplingRate;
    audio_format_t mFormat;
    audio_channel_mask_t mChannelMask;
    struct audio_gain_config mGain;
};


class AudioPatch: public RefBase
{
public:
    AudioPatch(audio_patch_handle_t handle, const struct audio_patch *patch, uid_t uid);

    status_t dump(int fd, int spaces, int index) const;

    audio_patch_handle_t mHandle;
    struct audio_patch mPatch;
    uid_t mUid;
    audio_patch_handle_t mAfPatchHandle;
};

}; // namespace android