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207 lines
5.9 KiB
207 lines
5.9 KiB
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//#define LOG_NDEBUG 0
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#define LOG_TAG "SkipCutBuffer"
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#include <utils/Log.h>
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#include <media/stagefright/foundation/ADebug.h>
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#include <media/stagefright/MediaBuffer.h>
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#include <media/stagefright/SkipCutBuffer.h>
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namespace android {
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SkipCutBuffer::SkipCutBuffer(size_t skip, size_t cut, size_t num16BitChannels) {
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mWriteHead = 0;
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mReadHead = 0;
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mCapacity = 0;
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mCutBuffer = NULL;
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if (num16BitChannels == 0 || num16BitChannels > INT32_MAX / 2) {
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ALOGW("# channels out of range: %zu, using passthrough instead", num16BitChannels);
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return;
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}
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size_t frameSize = num16BitChannels * 2;
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if (skip > INT32_MAX / frameSize || cut > INT32_MAX / frameSize
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|| cut * frameSize > INT32_MAX - 4096) {
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ALOGW("out of range skip/cut: %zu/%zu, using passthrough instead",
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skip, cut);
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return;
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}
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skip *= frameSize;
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cut *= frameSize;
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mFrontPadding = mSkip = skip;
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mBackPadding = cut;
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mCapacity = cut + 4096;
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mCutBuffer = new (std::nothrow) char[mCapacity];
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ALOGV("skipcutbuffer %zu %zu %d", skip, cut, mCapacity);
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}
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SkipCutBuffer::~SkipCutBuffer() {
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delete[] mCutBuffer;
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}
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void SkipCutBuffer::submit(MediaBuffer *buffer) {
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if (mCutBuffer == NULL) {
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// passthrough mode
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return;
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}
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int32_t offset = buffer->range_offset();
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int32_t buflen = buffer->range_length();
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// drop the initial data from the buffer if needed
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if (mFrontPadding > 0) {
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// still data left to drop
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int32_t to_drop = (buflen < mFrontPadding) ? buflen : mFrontPadding;
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offset += to_drop;
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buflen -= to_drop;
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buffer->set_range(offset, buflen);
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mFrontPadding -= to_drop;
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}
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// append data to cutbuffer
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char *src = ((char*) buffer->data()) + offset;
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write(src, buflen);
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// the mediabuffer is now empty. Fill it from cutbuffer, always leaving
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// at least mBackPadding bytes in the cutbuffer
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char *dst = (char*) buffer->data();
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size_t copied = read(dst, buffer->size());
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buffer->set_range(0, copied);
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}
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template <typename T>
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void SkipCutBuffer::submitInternal(const sp<T>& buffer) {
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if (mCutBuffer == NULL) {
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// passthrough mode
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return;
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}
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int32_t offset = buffer->offset();
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int32_t buflen = buffer->size();
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// drop the initial data from the buffer if needed
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if (mFrontPadding > 0) {
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// still data left to drop
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int32_t to_drop = (buflen < mFrontPadding) ? buflen : mFrontPadding;
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offset += to_drop;
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buflen -= to_drop;
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buffer->setRange(offset, buflen);
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mFrontPadding -= to_drop;
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}
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// append data to cutbuffer
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char *src = (char*) buffer->data();
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write(src, buflen);
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// the mediabuffer is now empty. Fill it from cutbuffer, always leaving
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// at least mBackPadding bytes in the cutbuffer
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char *dst = (char*) buffer->base();
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size_t copied = read(dst, buffer->capacity());
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buffer->setRange(0, copied);
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}
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void SkipCutBuffer::submit(const sp<ABuffer>& buffer) {
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submitInternal(buffer);
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}
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void SkipCutBuffer::submit(const sp<MediaCodecBuffer>& buffer) {
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submitInternal(buffer);
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}
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void SkipCutBuffer::clear() {
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mWriteHead = mReadHead = 0;
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mFrontPadding = mSkip;
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}
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void SkipCutBuffer::write(const char *src, size_t num) {
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int32_t sizeused = (mWriteHead - mReadHead);
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if (sizeused < 0) sizeused += mCapacity;
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// Everything must fit. Make sure the buffer is a little larger than needed,
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// so there is no ambiguity as to whether mWriteHead == mReadHead means buffer
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// full or empty
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size_t available = mCapacity - sizeused - 32;
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if (available < num) {
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int32_t newcapacity = mCapacity + (num - available);
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char * newbuffer = new char[newcapacity];
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memcpy(newbuffer, mCutBuffer, mCapacity);
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delete [] mCutBuffer;
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mCapacity = newcapacity;
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mCutBuffer = newbuffer;
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ALOGV("reallocated buffer at size %d", newcapacity);
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}
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size_t copyfirst = (mCapacity - mWriteHead);
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if (copyfirst > num) copyfirst = num;
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if (copyfirst) {
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memcpy(mCutBuffer + mWriteHead, src, copyfirst);
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num -= copyfirst;
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src += copyfirst;
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mWriteHead += copyfirst;
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CHECK_LE(mWriteHead, mCapacity);
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if (mWriteHead == mCapacity) mWriteHead = 0;
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if (num) {
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memcpy(mCutBuffer, src, num);
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mWriteHead += num;
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}
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}
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}
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size_t SkipCutBuffer::read(char *dst, size_t num) {
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int32_t available = (mWriteHead - mReadHead);
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if (available < 0) available += mCapacity;
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available -= mBackPadding;
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if (available <=0) {
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return 0;
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}
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if (available < int32_t(num)) {
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num = available;
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}
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size_t copyfirst = (mCapacity - mReadHead);
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if (copyfirst > num) copyfirst = num;
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if (copyfirst) {
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memcpy(dst, mCutBuffer + mReadHead, copyfirst);
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num -= copyfirst;
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dst += copyfirst;
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mReadHead += copyfirst;
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CHECK_LE(mReadHead, mCapacity);
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if (mReadHead == mCapacity) mReadHead = 0;
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if (num) {
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memcpy(dst, mCutBuffer, num);
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mReadHead += num;
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}
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}
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return available;
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}
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size_t SkipCutBuffer::size() {
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int32_t available = (mWriteHead - mReadHead);
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if (available < 0) available += mCapacity;
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return available;
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}
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} // namespace android
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