xref: /frameworks/av/media/libstagefright/DataSource.cpp

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * 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.
 */
//#define LOG_NDEBUG 0
#define LOG_TAG "DataSource"

#include "include/AMRExtractor.h"

#include "include/AACExtractor.h"
#include "include/DRMExtractor.h"
#include "include/FLACExtractor.h"
#include "include/HTTPBase.h"
#include "include/MP3Extractor.h"
#include "include/MPEG2PSExtractor.h"
#include "include/MPEG2TSExtractor.h"
#include "include/MPEG4Extractor.h"
#include "include/NuCachedSource2.h"
#include "include/OggExtractor.h"
#include "include/WAVExtractor.h"
#include "include/WVMExtractor.h"

#include "matroska/MatroskaExtractor.h"

#include <media/IMediaHTTPConnection.h>
#include <media/IMediaHTTPService.h>
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/AMessage.h>
#include <media/stagefright/DataSource.h>
#include <media/stagefright/DataURISource.h>
#include <media/stagefright/FileSource.h>
#include <media/stagefright/MediaErrors.h>
#include <media/stagefright/MediaHTTP.h>
#include <utils/String8.h>

#include <cutils/properties.h>

namespace android {

bool DataSource::getUInt16(off64_t offset, uint16_t *x) {
    *x = 0;

    uint8_t byte[2];
    if (readAt(offset, byte, 2) != 2) {
        return false;
    }

    *x = (byte[0] << 8) | byte[1];

    return true;
}

bool DataSource::getUInt24(off64_t offset, uint32_t *x) {
    *x = 0;

    uint8_t byte[3];
    if (readAt(offset, byte, 3) != 3) {
        return false;
    }

    *x = (byte[0] << 16) | (byte[1] << 8) | byte[2];

    return true;
}

bool DataSource::getUInt32(off64_t offset, uint32_t *x) {
    *x = 0;

    uint32_t tmp;
    if (readAt(offset, &tmp, 4) != 4) {
        return false;
    }

    *x = ntohl(tmp);

    return true;
}

bool DataSource::getUInt64(off64_t offset, uint64_t *x) {
    *x = 0;

    uint64_t tmp;
    if (readAt(offset, &tmp, 8) != 8) {
        return false;
    }

    *x = ntoh64(tmp);

    return true;
}

status_t DataSource::getSize(off64_t *size) {
    *size = 0;

    return ERROR_UNSUPPORTED;
}

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

Mutex DataSource::gSnifferMutex;
List<DataSource::SnifferFunc> DataSource::gSniffers;
bool DataSource::gSniffersRegistered = false;

bool DataSource::sniff(
        String8 *mimeType, float *confidence, sp<AMessage> *meta) {
    *mimeType = "";
    *confidence = 0.0f;
    meta->clear();

    {
        Mutex::Autolock autoLock(gSnifferMutex);
        if (!gSniffersRegistered) {
            return false;
        }
    }

    for (List<SnifferFunc>::iterator it = gSniffers.begin();
         it != gSniffers.end(); ++it) {
        String8 newMimeType;
        float newConfidence;
        sp<AMessage> newMeta;
        if ((*it)(this, &newMimeType, &newConfidence, &newMeta)) {
            if (newConfidence > *confidence) {
                *mimeType = newMimeType;
                *confidence = newConfidence;
                *meta = newMeta;
            }
        }
    }

    return *confidence > 0.0;
}

// static
void DataSource::RegisterSniffer_l(SnifferFunc func) {
    for (List<SnifferFunc>::iterator it = gSniffers.begin();
         it != gSniffers.end(); ++it) {
        if (*it == func) {
            return;
        }
    }

    gSniffers.push_back(func);
}

// static
void DataSource::RegisterDefaultSniffers() {
    Mutex::Autolock autoLock(gSnifferMutex);
    if (gSniffersRegistered) {
        return;
    }

    RegisterSniffer_l(SniffMPEG4);
    RegisterSniffer_l(SniffMatroska);
    RegisterSniffer_l(SniffOgg);
    RegisterSniffer_l(SniffWAV);
    RegisterSniffer_l(SniffFLAC);
    RegisterSniffer_l(SniffAMR);
    RegisterSniffer_l(SniffMPEG2TS);
    RegisterSniffer_l(SniffMP3);
    RegisterSniffer_l(SniffAAC);
    RegisterSniffer_l(SniffMPEG2PS);
    RegisterSniffer_l(SniffWVM);

    char value[PROPERTY_VALUE_MAX];
    if (property_get("drm.service.enabled", value, NULL)
            && (!strcmp(value, "1") || !strcasecmp(value, "true"))) {
        RegisterSniffer_l(SniffDRM);
    }
    gSniffersRegistered = true;
}

// static
sp<DataSource> DataSource::CreateFromURI(
        const sp<IMediaHTTPService> &httpService,
        const char *uri,
        const KeyedVector<String8, String8> *headers,
        AString *sniffedMIME) {
    if (sniffedMIME != NULL) {
        *sniffedMIME = "";
    }

    bool isWidevine = !strncasecmp("widevine://", uri, 11);

    sp<DataSource> source;
    if (!strncasecmp("file://", uri, 7)) {
        source = new FileSource(uri + 7);
    } else if (!strncasecmp("http://", uri, 7)
            || !strncasecmp("https://", uri, 8)
            || isWidevine) {
        sp<HTTPBase> httpSource = new MediaHTTP(httpService->makeHTTPConnection());

        String8 tmp;
        if (isWidevine) {
            tmp = String8("http://");
            tmp.append(uri + 11);

            uri = tmp.string();
        }

        if (httpSource->connect(uri, headers) != OK) {
            ALOGE("Failed to connect http source!");
            return NULL;
        }

        if (!isWidevine) {
            String8 cacheConfig;
            bool disconnectAtHighwatermark;
            if (headers != NULL) {
                KeyedVector<String8, String8> copy = *headers;
                NuCachedSource2::RemoveCacheSpecificHeaders(
                        &copy, &cacheConfig, &disconnectAtHighwatermark);
            }

            sp<NuCachedSource2> cachedSource = new NuCachedSource2(
                    httpSource,
                    cacheConfig.isEmpty() ? NULL : cacheConfig.string());

            String8 contentType = httpSource->getMIMEType();

            if (strncasecmp(contentType.string(), "audio/", 6)) {
                // We're not doing this for streams that appear to be audio-only
                // streams to ensure that even low bandwidth streams start
                // playing back fairly instantly.

                // We're going to prefill the cache before trying to instantiate
                // the extractor below, as the latter is an operation that otherwise
                // could block on the datasource for a significant amount of time.
                // During that time we'd be unable to abort the preparation phase
                // without this prefill.

                // Initially make sure we have at least 192 KB for the sniff
                // to complete without blocking.
                static const size_t kMinBytesForSniffing = 192 * 1024;

                off64_t metaDataSize = -1ll;
                for (;;) {
                    status_t finalStatus;
                    size_t cachedDataRemaining =
                            cachedSource->approxDataRemaining(&finalStatus);

                    if (finalStatus != OK || (metaDataSize >= 0
                            && (off64_t)cachedDataRemaining >= metaDataSize)) {
                        ALOGV("stop caching, status %d, "
                                "metaDataSize %lld, cachedDataRemaining %zu",
                                finalStatus, metaDataSize, cachedDataRemaining);
                        break;
                    }

                    ALOGV("now cached %zu bytes of data", cachedDataRemaining);

                    if (metaDataSize < 0
                            && cachedDataRemaining >= kMinBytesForSniffing) {
                        String8 tmp;
                        float confidence;
                        sp<AMessage> meta;
                        if (!cachedSource->sniff(&tmp, &confidence, &meta)) {
                            return NULL;
                        }

                        // We successfully identified the file's extractor to
                        // be, remember this mime type so we don't have to
                        // sniff it again when we call MediaExtractor::Create()
                        if (sniffedMIME != NULL) {
                            *sniffedMIME = tmp.string();
                        }

                        if (meta == NULL
                                || !meta->findInt64("meta-data-size",
                                     reinterpret_cast<int64_t*>(&metaDataSize))) {
                            metaDataSize = kDefaultMetaSize;
                        }

                        if (metaDataSize < 0ll) {
                            ALOGE("invalid metaDataSize = %lld bytes", metaDataSize);
                            return NULL;
                        }
                    }

                    usleep(200000);
                }
            }

            source = cachedSource;
        } else {
            // We do not want that prefetching, caching, datasource wrapper
            // in the widevine:// case.
            source = httpSource;
        }
    } else if (!strncasecmp("data:", uri, 5)) {
        source = DataURISource::Create(uri);
    } else {
        // Assume it's a filename.
        source = new FileSource(uri);
    }

    if (source == NULL || source->initCheck() != OK) {
        return NULL;
    }

    return source;
}

String8 DataSource::getMIMEType() const {
    return String8("application/octet-stream");
}

}  // namespace android