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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 //#define LOG_NDEBUG 0
     18 #define LOG_TAG "NuPlayerStreamListener"
     19 #include <utils/Log.h>
     20 
     21 #include "NuPlayerStreamListener.h"
     22 
     23 #include <binder/MemoryDealer.h>
     24 #include <media/stagefright/foundation/ADebug.h>
     25 #include <media/stagefright/foundation/AMessage.h>
     26 #include <media/stagefright/MediaErrors.h>
     27 
     28 namespace android {
     29 
     30 NuPlayer::NuPlayerStreamListener::NuPlayerStreamListener(
     31         const sp<IStreamSource> &source,
     32         const sp<AHandler> &targetHandler)
     33     : mSource(source),
     34       mTargetHandler(targetHandler),
     35       mEOS(false),
     36       mSendDataNotification(true) {
     37     mSource->setListener(this);
     38 
     39     mMemoryDealer = new MemoryDealer(kNumBuffers * kBufferSize);
     40     for (size_t i = 0; i < kNumBuffers; ++i) {
     41         sp<IMemory> mem = mMemoryDealer->allocate(kBufferSize);
     42         CHECK(mem != NULL);
     43 
     44         mBuffers.push(mem);
     45     }
     46     mSource->setBuffers(mBuffers);
     47 }
     48 
     49 void NuPlayer::NuPlayerStreamListener::start() {
     50     for (size_t i = 0; i < kNumBuffers; ++i) {
     51         mSource->onBufferAvailable(i);
     52     }
     53 }
     54 
     55 void NuPlayer::NuPlayerStreamListener::queueBuffer(size_t index, size_t size) {
     56     QueueEntry entry;
     57     entry.mIsCommand = false;
     58     entry.mIndex = index;
     59     entry.mSize = size;
     60     entry.mOffset = 0;
     61 
     62     Mutex::Autolock autoLock(mLock);
     63     mQueue.push_back(entry);
     64 
     65     if (mSendDataNotification) {
     66         mSendDataNotification = false;
     67 
     68         if (mTargetHandler != NULL) {
     69             (new AMessage(kWhatMoreDataQueued, mTargetHandler))->post();
     70         }
     71     }
     72 }
     73 
     74 void NuPlayer::NuPlayerStreamListener::issueCommand(
     75         Command cmd, bool synchronous, const sp<AMessage> &extra) {
     76     CHECK(!synchronous);
     77 
     78     QueueEntry entry;
     79     entry.mIsCommand = true;
     80     entry.mCommand = cmd;
     81     entry.mExtra = extra;
     82 
     83     Mutex::Autolock autoLock(mLock);
     84     mQueue.push_back(entry);
     85 
     86     if (mSendDataNotification) {
     87         mSendDataNotification = false;
     88 
     89         if (mTargetHandler != NULL) {
     90             (new AMessage(kWhatMoreDataQueued, mTargetHandler))->post();
     91         }
     92     }
     93 }
     94 
     95 ssize_t NuPlayer::NuPlayerStreamListener::read(
     96         void *data, size_t size, sp<AMessage> *extra) {
     97     CHECK_GT(size, 0u);
     98 
     99     extra->clear();
    100 
    101     Mutex::Autolock autoLock(mLock);
    102 
    103     if (mEOS) {
    104         return 0;
    105     }
    106 
    107     if (mQueue.empty()) {
    108         mSendDataNotification = true;
    109 
    110         return -EWOULDBLOCK;
    111     }
    112 
    113     QueueEntry *entry = &*mQueue.begin();
    114 
    115     if (entry->mIsCommand) {
    116         switch (entry->mCommand) {
    117             case EOS:
    118             {
    119                 mQueue.erase(mQueue.begin());
    120                 entry = NULL;
    121 
    122                 mEOS = true;
    123                 return 0;
    124             }
    125 
    126             case DISCONTINUITY:
    127             {
    128                 *extra = entry->mExtra;
    129 
    130                 mQueue.erase(mQueue.begin());
    131                 entry = NULL;
    132 
    133                 return INFO_DISCONTINUITY;
    134             }
    135 
    136             default:
    137                 TRESPASS();
    138                 break;
    139         }
    140     }
    141 
    142     size_t copy = entry->mSize;
    143     if (copy > size) {
    144         copy = size;
    145     }
    146 
    147     memcpy(data,
    148            (const uint8_t *)mBuffers.editItemAt(entry->mIndex)->pointer()
    149             + entry->mOffset,
    150            copy);
    151 
    152     entry->mOffset += copy;
    153     entry->mSize -= copy;
    154 
    155     if (entry->mSize == 0) {
    156         mSource->onBufferAvailable(entry->mIndex);
    157         mQueue.erase(mQueue.begin());
    158         entry = NULL;
    159     }
    160 
    161     return copy;
    162 }
    163 
    164 }  // namespace android
    165