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      1 /*
      2  * Copyright 2008, The Android Open Source Project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 // must include config.h first for webkit to fiddle with new/delete
     27 #include "config.h"
     28 #include "android_npapi.h"
     29 
     30 #include "SkTypes.h"
     31 #include "media/AudioTrack.h"
     32 
     33 #include <system/audio.h>
     34 
     35 struct ANPAudioTrack {
     36     void*                mUser;
     37     ANPAudioCallbackProc mProc;
     38     android::AudioTrack* mTrack;
     39     int                  mChannelCount;
     40 };
     41 
     42 static ANPSampleFormat toANPFormat(audio_format_t fm) {
     43     switch (fm) {
     44         case AUDIO_FORMAT_PCM_16_BIT:
     45             return kPCM16Bit_ANPSampleFormat;
     46         case AUDIO_FORMAT_PCM_8_BIT:
     47             return kPCM8Bit_ANPSampleFormat;
     48         default:
     49             return kUnknown_ANPSamleFormat;
     50     }
     51 }
     52 
     53 static audio_format_t fromANPFormat(ANPSampleFormat fm) {
     54     switch (fm) {
     55         case kPCM16Bit_ANPSampleFormat:
     56             return AUDIO_FORMAT_PCM_16_BIT;
     57         case kPCM8Bit_ANPSampleFormat:
     58             return AUDIO_FORMAT_PCM_8_BIT;
     59         default:
     60             return AUDIO_FORMAT_INVALID;
     61     }
     62 }
     63 
     64 static void callbackProc(int event, void* user, void* info) {
     65     ANPAudioTrack* track = reinterpret_cast<ANPAudioTrack*>(user);
     66 
     67     switch (event) {
     68         case android::AudioTrack::EVENT_MORE_DATA: {
     69             ANPAudioBuffer dst;
     70             android::AudioTrack::Buffer* src;
     71 
     72             src = reinterpret_cast<android::AudioTrack::Buffer*>(info);
     73             dst.bufferData      = src->raw;
     74             dst.channelCount    = track->mChannelCount;
     75             dst.format          = toANPFormat(AUDIO_FORMAT_PCM_16_BIT);
     76             dst.size            = src->size;
     77             track->mProc(kMoreData_ANPAudioEvent, track->mUser, &dst);
     78             // return the updated size field
     79             src->size = dst.size;
     80             break;
     81         }
     82         case android::AudioTrack::EVENT_UNDERRUN:
     83             track->mProc(kUnderRun_ANPAudioEvent, track->mUser, NULL);
     84             break;
     85         default:
     86             SkDebugf("------ unknown audio event for plugin %d\n", event);
     87             break;
     88     }
     89 }
     90 
     91 static ANPAudioTrack* ANPCreateTrack(uint32_t sampleRate,
     92                                      ANPSampleFormat format,
     93                                      int channelCount,
     94                                      ANPAudioCallbackProc proc,
     95                                      void* user) {
     96 
     97     ANPAudioTrack* track = new ANPAudioTrack;
     98 
     99     track->mUser = user;
    100     track->mProc = proc;
    101     track->mTrack = new android::AudioTrack(AUDIO_STREAM_MUSIC,
    102                                             sampleRate,
    103                                             fromANPFormat(format),
    104                                             audio_channel_out_mask_from_count(channelCount),
    105                                             0,  // frameCount
    106                                             (audio_output_flags_t) 0, // AUDIO_OUTPUT_FLAG_NONE,
    107                                             callbackProc,
    108                                             track,
    109                                             0);
    110     track->mChannelCount = channelCount;
    111 
    112     if (track->mTrack->initCheck() != 0) {  // failure
    113         delete track->mTrack;
    114         delete track;
    115         track = NULL;
    116     }
    117     return track;
    118 }
    119 
    120 static void ANPDeleteTrack(ANPAudioTrack* track) {
    121     if (track) {
    122         delete track->mTrack;
    123         delete track;
    124     }
    125 }
    126 
    127 static void ANPTrackStart(ANPAudioTrack* track) {
    128     track->mTrack->start();
    129 }
    130 
    131 static void ANPTrackPause(ANPAudioTrack* track) {
    132     track->mTrack->pause();
    133 }
    134 
    135 static void ANPTrackStop(ANPAudioTrack* track) {
    136     track->mTrack->stop();
    137 }
    138 
    139 static bool ANPTrackIsStopped(ANPAudioTrack* track) {
    140     return track->mTrack->stopped();
    141 }
    142 
    143 static uint32_t ANPTrackLatency(ANPAudioTrack* track) {
    144     return track->mTrack->latency();
    145 }
    146 
    147 ///////////////////////////////////////////////////////////////////////////////
    148 
    149 void ANPAudioTrackInterfaceV0_Init(ANPInterface* value) {
    150     ANPAudioTrackInterfaceV0* si = reinterpret_cast<ANPAudioTrackInterfaceV0*>(value);
    151     si->newTrack    = ANPCreateTrack;
    152     si->deleteTrack = ANPDeleteTrack;
    153     si->start       = ANPTrackStart;
    154     si->pause       = ANPTrackPause;
    155     si->stop        = ANPTrackStop;
    156     si->isStopped   = ANPTrackIsStopped;
    157 }
    158 
    159 void ANPAudioTrackInterfaceV1_Init(ANPInterface* value) {
    160     // initialize the functions from the previous interface
    161     ANPAudioTrackInterfaceV0_Init(value);
    162     // add any new functions or override existing functions
    163     ANPAudioTrackInterfaceV1* si = reinterpret_cast<ANPAudioTrackInterfaceV1*>(value);
    164     si->trackLatency = ANPTrackLatency;
    165 }
    166