C++ (Cpp) buildSampleEntriesTable Examples

Example #1

File: SampleTable.cpp Project: ghostrider96/platform_frameworks_av

status_t SampleTable::findSampleAtTime(
        uint64_t req_time, uint64_t scale_num, uint64_t scale_den,
        uint32_t *sample_index, uint32_t flags) {
    buildSampleEntriesTable();

    if (mSampleTimeEntries == NULL) {
        return ERROR_OUT_OF_RANGE;
    }

    uint32_t left = 0;
    uint32_t right_plus_one = mNumSampleSizes;
    while (left < right_plus_one) {
        uint32_t center = left + (right_plus_one - left) / 2;
        uint64_t centerTime =
            getSampleTime(center, scale_num, scale_den);

        if (req_time < centerTime) {
            right_plus_one = center;
        } else if (req_time > centerTime) {
            left = center + 1;
        } else {
            *sample_index = mSampleTimeEntries[center].mSampleIndex;
            return OK;
        }
    }

    uint32_t closestIndex = left;

    if (closestIndex == mNumSampleSizes) {
        if (flags == kFlagAfter) {
            return ERROR_OUT_OF_RANGE;
        }
        flags = kFlagBefore;
    } else if (closestIndex == 0) {
        if (flags == kFlagBefore) {
            // normally we should return out of range, but that is
            // treated as end-of-stream.  instead return first sample
            //
            // return ERROR_OUT_OF_RANGE;
        }
        flags = kFlagAfter;
    }

    switch (flags) {
        case kFlagBefore:
        {
            --closestIndex;
            break;
        }

        case kFlagAfter:
        {
            // nothing to do
            break;
        }

        default:
        {
            CHECK(flags == kFlagClosest);
            // pick closest based on timestamp. use abs_difference for safety
            if (abs_difference(
                    getSampleTime(closestIndex, scale_num, scale_den), req_time) >
                abs_difference(
                    req_time, getSampleTime(closestIndex - 1, scale_num, scale_den))) {
                --closestIndex;
            }
            break;
        }
    }

    *sample_index = mSampleTimeEntries[closestIndex].mSampleIndex;
    return OK;
}

Example #2

File: SampleTable.cpp Project: dagix5/android_frameworks_av

status_t SampleTable::findSampleAtTime(
        uint32_t req_time, uint32_t *sample_index, uint32_t flags) {
    buildSampleEntriesTable();

    uint32_t left = 0;
    uint32_t right = mNumSampleSizes;
    while (left < right) {
        uint32_t center = (left + right) / 2;
        uint32_t centerTime = mSampleTimeEntries[center].mCompositionTime;

        if (req_time < centerTime) {
            right = center;
        } else if (req_time > centerTime) {
            left = center + 1;
        } else {
            left = center;
            break;
        }
    }

    if (left == mNumSampleSizes) {
        if (flags == kFlagAfter) {
            return ERROR_OUT_OF_RANGE;
        }

        --left;
    }

    uint32_t closestIndex = left;

    switch (flags) {
        case kFlagBefore:
        {
            while (closestIndex > 0
                    && mSampleTimeEntries[closestIndex].mCompositionTime
                            > req_time) {
                --closestIndex;
            }
            break;
        }

        case kFlagAfter:
        {
            while (closestIndex + 1 < mNumSampleSizes
                    && mSampleTimeEntries[closestIndex].mCompositionTime
                            < req_time) {
                ++closestIndex;
            }
            break;
        }

        default:
        {
            CHECK(flags == kFlagClosest);

            if (closestIndex > 0) {
                // Check left neighbour and pick closest.
                uint32_t absdiff1 =
                    abs_difference(
                            mSampleTimeEntries[closestIndex].mCompositionTime,
                            req_time);

                uint32_t absdiff2 =
                    abs_difference(
                            mSampleTimeEntries[closestIndex - 1].mCompositionTime,
                            req_time);

                if (absdiff1 > absdiff2) {
                    closestIndex = closestIndex - 1;
                }
            }

            break;
        }
    }

    *sample_index = mSampleTimeEntries[closestIndex].mSampleIndex;

    return OK;
}