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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 "StreamingSource"
     19 #include <utils/Log.h>
     20 
     21 #include "StreamingSource.h"
     22 
     23 #include "ATSParser.h"
     24 #include "AnotherPacketSource.h"
     25 #include "NuPlayerStreamListener.h"
     26 
     27 #include <media/stagefright/foundation/ABuffer.h>
     28 #include <media/stagefright/foundation/ADebug.h>
     29 #include <media/stagefright/foundation/AMessage.h>
     30 #include <media/stagefright/MediaSource.h>
     31 #include <media/stagefright/MetaData.h>
     32 
     33 namespace android {
     34 
     35 NuPlayer::StreamingSource::StreamingSource(const sp<IStreamSource> &source)
     36     : mSource(source),
     37       mFinalResult(OK) {
     38 }
     39 
     40 NuPlayer::StreamingSource::~StreamingSource() {
     41 }
     42 
     43 void NuPlayer::StreamingSource::start() {
     44     mStreamListener = new NuPlayerStreamListener(mSource, 0);
     45     mTSParser = new ATSParser(ATSParser::TS_TIMESTAMPS_ARE_ABSOLUTE);
     46 
     47     mStreamListener->start();
     48 }
     49 
     50 status_t NuPlayer::StreamingSource::feedMoreTSData() {
     51     if (mFinalResult != OK) {
     52         return mFinalResult;
     53     }
     54 
     55     for (int32_t i = 0; i < 50; ++i) {
     56         char buffer[188];
     57         sp<AMessage> extra;
     58         ssize_t n = mStreamListener->read(buffer, sizeof(buffer), &extra);
     59 
     60         if (n == 0) {
     61             ALOGI("input data EOS reached.");
     62             mTSParser->signalEOS(ERROR_END_OF_STREAM);
     63             mFinalResult = ERROR_END_OF_STREAM;
     64             break;
     65         } else if (n == INFO_DISCONTINUITY) {
     66             int32_t type = ATSParser::DISCONTINUITY_SEEK;
     67 
     68             int32_t mask;
     69             if (extra != NULL
     70                     && extra->findInt32(
     71                         IStreamListener::kKeyDiscontinuityMask, &mask)) {
     72                 if (mask == 0) {
     73                     ALOGE("Client specified an illegal discontinuity type.");
     74                     return ERROR_UNSUPPORTED;
     75                 }
     76 
     77                 type = mask;
     78             }
     79 
     80             mTSParser->signalDiscontinuity(
     81                     (ATSParser::DiscontinuityType)type, extra);
     82         } else if (n < 0) {
     83             CHECK_EQ(n, -EWOULDBLOCK);
     84             break;
     85         } else {
     86             if (buffer[0] == 0x00) {
     87                 // XXX legacy
     88                 mTSParser->signalDiscontinuity(
     89                         buffer[1] == 0x00
     90                             ? ATSParser::DISCONTINUITY_SEEK
     91                             : ATSParser::DISCONTINUITY_FORMATCHANGE,
     92                         extra);
     93             } else {
     94                 status_t err = mTSParser->feedTSPacket(buffer, sizeof(buffer));
     95 
     96                 if (err != OK) {
     97                     ALOGE("TS Parser returned error %d", err);
     98 
     99                     mTSParser->signalEOS(err);
    100                     mFinalResult = err;
    101                     break;
    102                 }
    103             }
    104         }
    105     }
    106 
    107     return OK;
    108 }
    109 
    110 sp<MetaData> NuPlayer::StreamingSource::getFormat(bool audio) {
    111     ATSParser::SourceType type =
    112         audio ? ATSParser::AUDIO : ATSParser::VIDEO;
    113 
    114     sp<AnotherPacketSource> source =
    115         static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
    116 
    117     if (source == NULL) {
    118         return NULL;
    119     }
    120 
    121     return source->getFormat();
    122 }
    123 
    124 status_t NuPlayer::StreamingSource::dequeueAccessUnit(
    125         bool audio, sp<ABuffer> *accessUnit) {
    126     ATSParser::SourceType type =
    127         audio ? ATSParser::AUDIO : ATSParser::VIDEO;
    128 
    129     sp<AnotherPacketSource> source =
    130         static_cast<AnotherPacketSource *>(mTSParser->getSource(type).get());
    131 
    132     if (source == NULL) {
    133         return -EWOULDBLOCK;
    134     }
    135 
    136     status_t finalResult;
    137     if (!source->hasBufferAvailable(&finalResult)) {
    138         return finalResult == OK ? -EWOULDBLOCK : finalResult;
    139     }
    140 
    141     return source->dequeueAccessUnit(accessUnit);
    142 }
    143 
    144 }  // namespace android
    145 
    146