alsa_sound/AudioStreamOutALSA.cpp

/* AudioStreamOutALSA.cpp
 **
 ** Copyright 2008-2009 Wind River Systems
 ** Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 **
 ** 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 <errno.h>
#include <stdarg.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <dlfcn.h>
#include <math.h>

#define LOG_TAG "AudioStreamOutALSA"
//#define LOG_NDEBUG 0
#define LOG_NDDEBUG 0
#include <utils/Log.h>
#include <utils/String8.h>

#include <cutils/properties.h>
#include <media/AudioRecord.h>
#include <hardware_legacy/power.h>

#include "AudioHardwareALSA.h"

#ifndef ALSA_DEFAULT_SAMPLE_RATE
#define ALSA_DEFAULT_SAMPLE_RATE 44100 // in Hz
#endif

namespace android_audio_legacy
{

// ----------------------------------------------------------------------------

static const int DEFAULT_SAMPLE_RATE = ALSA_DEFAULT_SAMPLE_RATE;

// ----------------------------------------------------------------------------

AudioStreamOutALSA::AudioStreamOutALSA(AudioHardwareALSA *parent, alsa_handle_t *handle) :
    ALSAStreamOps(parent, handle),
    mParent(parent),
    mFrameCount(0)
{
}

AudioStreamOutALSA::~AudioStreamOutALSA()
{
    close();
}

uint32_t AudioStreamOutALSA::channels() const
{
    int c = ALSAStreamOps::channels();
    return c;
}

status_t AudioStreamOutALSA::setVolume(float left, float right)
{
    int vol;
    float volume;
    status_t status = NO_ERROR;

    volume = (left + right) / 2;
    if (volume < 0.0) {
        LOGW("AudioSessionOutALSA::setVolume(%f) under 0.0, assuming 0.0\n", volume);
        volume = 0.0;
    } else if (volume > 1.0) {
        LOGW("AudioSessionOutALSA::setVolume(%f) over 1.0, assuming 1.0\n", volume);
        volume = 1.0;
    }
    vol = lrint((volume * 0x2000)+0.5);

    if(!strcmp(mHandle->useCase, SND_USE_CASE_VERB_HIFI_LOW_POWER) ||
       !strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_LPA)) {
        LOGD("setLpaVolume(%f)\n", volume);
        LOGD("Setting LPA volume to %d (available range is 0 to 100)\n", vol);
        mHandle->module->setLpaVolume(vol);
        return status;
    }
    else if(!strcmp(mHandle->useCase, SND_USE_CASE_VERB_HIFI_TUNNEL) ||
            !strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_TUNNEL)) {
        LOGD("setCompressedVolume(%f)\n", volume);
        LOGD("Setting Compressed volume to %d (available range is 0 to 100)\n", vol);
        mHandle->module->setCompressedVolume(vol);
        return status;
    }
    else if(!strncmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL,
            sizeof(mHandle->useCase)) || !strncmp(mHandle->useCase,
            SND_USE_CASE_MOD_PLAY_VOIP, sizeof(mHandle->useCase))) {
        LOGV("Avoid Software volume by returning success\n");
        return status;
    }
    return INVALID_OPERATION;
}

ssize_t AudioStreamOutALSA::write(const void *buffer, size_t bytes)
{
    int period_size;
    char *use_case;

    LOGV("write:: buffer %p, bytes %d", buffer, bytes);

    snd_pcm_sframes_t n = 0;
    size_t            sent = 0;
    status_t          err;

    int write_pending = bytes;

    if((mHandle->handle == NULL) && (mHandle->rxHandle == NULL) &&
         (strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) &&
         (strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
        mParent->mLock.lock();
        /* PCM handle might be closed and reopened immediately to flush
         * the buffers, recheck and break if PCM handle is valid */
        if (mHandle->handle == NULL && mHandle->rxHandle == NULL) {
            snd_use_case_get(mHandle->ucMgr, "_verb", (const char **)&use_case);
            if ((use_case == NULL) || (!strcmp(use_case, SND_USE_CASE_VERB_INACTIVE))) {
                if(!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)){
                     strlcpy(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL,sizeof(mHandle->useCase));
                 }
                 else {
                     strlcpy(mHandle->useCase, SND_USE_CASE_VERB_HIFI, sizeof(mHandle->useCase));
                 }
            } else {
                if(!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP)) {
                    strlcpy(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP,sizeof(mHandle->useCase));
                 } else {
                     strlcpy(mHandle->useCase, SND_USE_CASE_MOD_PLAY_MUSIC, sizeof(mHandle->useCase));
                 }
            }
            free(use_case);
            if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) ||
               (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
#if 0
                if((mDevices & AudioSystem::DEVICE_OUT_ANLG_DOCK_HEADSET)||
                      (mDevices & AudioSystem::DEVICE_OUT_DGTL_DOCK_HEADSET)||
                      (mDevices & AudioSystem::DEVICE_OUT_PROXY)) {
                    mDevices |= AudioSystem::DEVICE_OUT_PROXY;
                    mHandle->module->route(mHandle, mDevices , mParent->mode());
                }else
#endif         
                {
                  mHandle->module->route(mHandle, mDevices , AudioSystem::MODE_IN_COMMUNICATION);
                }
#if 0
            } else if((mDevices & AudioSystem::DEVICE_OUT_ANLG_DOCK_HEADSET)||
                      (mDevices & AudioSystem::DEVICE_OUT_DGTL_DOCK_HEADSET)||
                      (mDevices & AudioSystem::DEVICE_OUT_PROXY)) {
                mDevices |= AudioSystem::DEVICE_OUT_PROXY;
                mHandle->module->route(mHandle, mDevices , mParent->mode());
#endif
            } else {
 
                  mHandle->module->route(mHandle, mDevices , mParent->mode());
            }
            if (!strcmp(mHandle->useCase, SND_USE_CASE_VERB_HIFI) ||
                !strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) {
                snd_use_case_set(mHandle->ucMgr, "_verb", mHandle->useCase);
            } else {
                snd_use_case_set(mHandle->ucMgr, "_enamod", mHandle->useCase);
            }
            if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) ||
              (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
                 err = mHandle->module->startVoipCall(mHandle);
            }
            else
                 mHandle->module->open(mHandle);
            if(mHandle->handle == NULL) {
                LOGE("write:: device open failed");
                mParent->mLock.unlock();
                return 0;
            }
#if 0
            if((mHandle->devices == AudioSystem::DEVICE_IN_ANLG_DOCK_HEADSET)||
                   (mHandle->devices == AudioSystem::DEVICE_OUT_ANLG_DOCK_HEADSET)){
                if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) ||
                   (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
                    mParent->musbPlaybackState |= USBPLAYBACKBIT_VOIPCALL;
                } else {
                    mParent->startUsbPlaybackIfNotStarted();
                    mParent->musbPlaybackState |= USBPLAYBACKBIT_MUSIC;
                }
            }
#endif
        }
        mParent->mLock.unlock();
    }

    if(((mDevices & AudioSystem::DEVICE_OUT_ANLG_DOCK_HEADSET) ||
        (mDevices & AudioSystem::DEVICE_OUT_DGTL_DOCK_HEADSET)) &&
        (!mParent->musbPlaybackState)) {
        mParent->mLock.lock();
        mParent->startUsbPlaybackIfNotStarted();
        LOGD("Starting playback on USB");
        if(!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL) ||
           !strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP)) {
            LOGE("Setting VOIPCALL bit here, musbPlaybackState %d", mParent->musbPlaybackState);
            mParent->musbPlaybackState |= USBPLAYBACKBIT_VOIPCALL;
        }else{
            LOGD("enabling music, musbPlaybackState: %d ", mParent->musbPlaybackState);
            mParent->musbPlaybackState |= USBPLAYBACKBIT_MUSIC;
        }
        mParent->mLock.unlock();
    }

    period_size = mHandle->periodSize;
    do {
        if (write_pending < period_size) {
            write_pending = period_size;
        }
        if((mParent->mVoipStreamCount) && (mHandle->rxHandle != 0)) {
            n = pcm_write(mHandle->rxHandle,
                     (char *)buffer + sent,
                      period_size);
        } else if (mHandle->handle != 0){
            n = pcm_write(mHandle->handle,
                     (char *)buffer + sent,
                      period_size);
        }
        if (n < 0) {
	    mParent->mLock.lock();
            LOGE("pcm_write returned error %d, trying to recover\n", n);
            pcm_close(mHandle->handle);
            mHandle->handle = NULL;
            if((!strncmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL, strlen(SND_USE_CASE_VERB_IP_VOICECALL))) ||
              (!strncmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP, strlen(SND_USE_CASE_MOD_PLAY_VOIP)))) {
                 pcm_close(mHandle->rxHandle);
                 mHandle->rxHandle = NULL;
                 mHandle->module->startVoipCall(mHandle);
            }
            else
            mHandle->module->open(mHandle);
            mParent->mLock.unlock();
            continue;
        }
        else {
            mFrameCount += n;
            sent += static_cast<ssize_t>((period_size));
            write_pending -= period_size;
        }

    } while ((mHandle->handle||(mHandle->rxHandle && mParent->mVoipStreamCount)) && sent < bytes);

    return sent;
}

status_t AudioStreamOutALSA::dump(int fd, const Vector<String16>& args)
{
    return NO_ERROR;
}

status_t AudioStreamOutALSA::open(int mode)
{
    Mutex::Autolock autoLock(mParent->mLock);

    return ALSAStreamOps::open(mode);
}

status_t AudioStreamOutALSA::close()
{
    Mutex::Autolock autoLock(mParent->mLock);

    LOGD("close");
    if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) ||
        (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
         if((mParent->mVoipStreamCount)) {
             if(mParent->mVoipStreamCount == 1) {
                 LOGD("Deregistering VOIP Call bit, musbPlaybackState:%d, musbRecordingState: %d",
                       mParent->musbPlaybackState, mParent->musbRecordingState);
                 mParent->musbPlaybackState &= ~USBPLAYBACKBIT_VOIPCALL;
                 mParent->musbRecordingState &= ~USBRECBIT_VOIPCALL;
                 mParent->closeUsbPlaybackIfNothingActive();
                 mParent->closeUsbRecordingIfNothingActive();
             }
                return NO_ERROR;
         }
         mParent->mVoipStreamCount = 0;
         mParent->mVoipMicMute = 0;
    } else if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_HIFI_LOW_POWER)) ||
              (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_LPA))) {
        mParent->musbPlaybackState &= ~USBPLAYBACKBIT_LPA;
    } else {
        mParent->musbPlaybackState &= ~USBPLAYBACKBIT_MUSIC;
    }

    mParent->closeUsbPlaybackIfNothingActive();

    ALSAStreamOps::close();

    return NO_ERROR;
}

status_t AudioStreamOutALSA::standby()
{
    Mutex::Autolock autoLock(mParent->mLock);

    LOGD("standby");

    if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_IP_VOICECALL)) ||
      (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_VOIP))) {
        return NO_ERROR;
    }

    if((!strcmp(mHandle->useCase, SND_USE_CASE_VERB_HIFI_LOW_POWER)) ||
        (!strcmp(mHandle->useCase, SND_USE_CASE_MOD_PLAY_LPA))) {
        LOGD("Deregistering LPA bit");
        mParent->musbPlaybackState &= ~USBPLAYBACKBIT_LPA;
    } else {
        LOGD("Deregistering MUSIC bit, musbPlaybackState: %d", mParent->musbPlaybackState);
        mParent->musbPlaybackState &= ~USBPLAYBACKBIT_MUSIC;
    }

    mHandle->module->standby(mHandle);

    mParent->closeUsbPlaybackIfNothingActive();

    mFrameCount = 0;

    return NO_ERROR;
}

#define USEC_TO_MSEC(x) ((x + 999) / 1000)

uint32_t AudioStreamOutALSA::latency() const
{
    // Android wants latency in milliseconds.
    return USEC_TO_MSEC (mHandle->latency);
}

// return the number of audio frames written by the audio dsp to DAC since
// the output has exited standby
status_t AudioStreamOutALSA::getRenderPosition(uint32_t *dspFrames)
{
    *dspFrames = mFrameCount;
    return NO_ERROR;
}

}       // namespace android_audio_legacy