Source/WebKit/android/plugins/ANPSoundInterface.cpp

/*
 * Copyright 2008, The Android Open Source Project
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// must include config.h first for webkit to fiddle with new/delete
#include "config.h"
#include "android_npapi.h"

#include "SkTypes.h"
#include "media/AudioTrack.h"

#include <system/audio.h>

struct ANPAudioTrack {
    void*                mUser;
    ANPAudioCallbackProc mProc;
    android::AudioTrack* mTrack;
    int                  mChannelCount;
};

static ANPSampleFormat toANPFormat(audio_format_t fm) {
    switch (fm) {
        case AUDIO_FORMAT_PCM_16_BIT:
            return kPCM16Bit_ANPSampleFormat;
        case AUDIO_FORMAT_PCM_8_BIT:
            return kPCM8Bit_ANPSampleFormat;
        default:
            return kUnknown_ANPSamleFormat;
    }
}

static audio_format_t fromANPFormat(ANPSampleFormat fm) {
    switch (fm) {
        case kPCM16Bit_ANPSampleFormat:
            return AUDIO_FORMAT_PCM_16_BIT;
        case kPCM8Bit_ANPSampleFormat:
            return AUDIO_FORMAT_PCM_8_BIT;
        default:
            return AUDIO_FORMAT_INVALID;
    }
}

static void callbackProc(int event, void* user, void* info) {
    ANPAudioTrack* track = reinterpret_cast<ANPAudioTrack*>(user);
    
    switch (event) {
        case android::AudioTrack::EVENT_MORE_DATA: {
            ANPAudioBuffer dst;
            android::AudioTrack::Buffer* src;
            
            src = reinterpret_cast<android::AudioTrack::Buffer*>(info);
            dst.bufferData      = src->raw;
            dst.channelCount    = track->mChannelCount;
            dst.format          = toANPFormat(AUDIO_FORMAT_PCM_16_BIT);
            dst.size            = src->size;
            track->mProc(kMoreData_ANPAudioEvent, track->mUser, &dst);
            // return the updated size field
            src->size = dst.size;
            break;
        }
        case android::AudioTrack::EVENT_UNDERRUN:
            track->mProc(kUnderRun_ANPAudioEvent, track->mUser, NULL);
            break;
        default:
            SkDebugf("------ unknown audio event for plugin %d\n", event);
            break;
    }
}

static ANPAudioTrack* ANPCreateTrack(uint32_t sampleRate,
                                     ANPSampleFormat format,
                                     int channelCount,
                                     ANPAudioCallbackProc proc,
                                     void* user) {
    
    ANPAudioTrack* track = new ANPAudioTrack;
    
    track->mUser = user;
    track->mProc = proc;
    track->mTrack = new android::AudioTrack(AUDIO_STREAM_MUSIC,
                                            sampleRate,
                                            fromANPFormat(format),
                                            audio_channel_out_mask_from_count(channelCount),
                                            0,  // frameCount
                                            (audio_output_flags_t) 0, // AUDIO_OUTPUT_FLAG_NONE,
                                            callbackProc,
                                            track,
                                            0);
    track->mChannelCount = channelCount;
    
    if (track->mTrack->initCheck() != 0) {  // failure
        delete track->mTrack;
        delete track;
        track = NULL;
    }
    return track;
}

static void ANPDeleteTrack(ANPAudioTrack* track) {
    if (track) {
        delete track->mTrack;
        delete track;
    }
}

static void ANPTrackStart(ANPAudioTrack* track) {
    track->mTrack->start();
}

static void ANPTrackPause(ANPAudioTrack* track) {
    track->mTrack->pause();
}

static void ANPTrackStop(ANPAudioTrack* track) {
    track->mTrack->stop();
}

static bool ANPTrackIsStopped(ANPAudioTrack* track) {
    return track->mTrack->stopped();
}

static uint32_t ANPTrackLatency(ANPAudioTrack* track) {
    return track->mTrack->latency();
}

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

void ANPAudioTrackInterfaceV0_Init(ANPInterface* value) {
    ANPAudioTrackInterfaceV0* si = reinterpret_cast<ANPAudioTrackInterfaceV0*>(value);
    si->newTrack    = ANPCreateTrack;
    si->deleteTrack = ANPDeleteTrack;
    si->start       = ANPTrackStart;
    si->pause       = ANPTrackPause;
    si->stop        = ANPTrackStop;
    si->isStopped   = ANPTrackIsStopped;
}

void ANPAudioTrackInterfaceV1_Init(ANPInterface* value) {
    // initialize the functions from the previous interface
    ANPAudioTrackInterfaceV0_Init(value);
    // add any new functions or override existing functions
    ANPAudioTrackInterfaceV1* si = reinterpret_cast<ANPAudioTrackInterfaceV1*>(value);
    si->trackLatency = ANPTrackLatency;
}