611 lines
20 KiB
C++
611 lines
20 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop version of Telegram messaging app, see https://telegram.org
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Telegram Desktop is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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It is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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In addition, as a special exception, the copyright holders give permission
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to link the code of portions of this program with the OpenSSL library.
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Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
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Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
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*/
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#include "media/media_clip_ffmpeg.h"
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#include "media/media_audio.h"
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#include "media/media_child_ffmpeg_loader.h"
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#include "storage/file_download.h"
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namespace Media {
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namespace Clip {
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namespace internal {
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namespace {
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constexpr int kSkipInvalidDataPackets = 10;
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constexpr int kAlignImageBy = 16;
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void alignedImageBufferCleanupHandler(void *data) {
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auto buffer = static_cast<uchar*>(data);
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delete[] buffer;
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}
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// Create a QImage of desired size where all the data is aligned to 16 bytes.
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QImage createAlignedImage(QSize size) {
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auto width = size.width();
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auto height = size.height();
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auto widthalign = kAlignImageBy / 4;
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auto neededwidth = width + ((width % widthalign) ? (widthalign - (width % widthalign)) : 0);
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auto bytesperline = neededwidth * 4;
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auto buffer = new uchar[bytesperline * height + kAlignImageBy];
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auto cleanupdata = static_cast<void*>(buffer);
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auto bufferval = reinterpret_cast<uintptr_t>(buffer);
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auto alignedbuffer = buffer + ((bufferval % kAlignImageBy) ? (kAlignImageBy - (bufferval % kAlignImageBy)) : 0);
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return QImage(alignedbuffer, width, height, bytesperline, QImage::Format_ARGB32, alignedImageBufferCleanupHandler, cleanupdata);
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}
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bool isAlignedImage(const QImage &image) {
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return !(reinterpret_cast<uintptr_t>(image.constBits()) % kAlignImageBy) && !(image.bytesPerLine() % kAlignImageBy);
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}
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} // namespace
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FFMpegReaderImplementation::FFMpegReaderImplementation(FileLocation *location, QByteArray *data, const AudioMsgId &audio) : ReaderImplementation(location, data)
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, _audioMsgId(audio) {
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_frame = av_frame_alloc();
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av_init_packet(&_packetNull);
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_packetNull.data = nullptr;
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_packetNull.size = 0;
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}
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ReaderImplementation::ReadResult FFMpegReaderImplementation::readNextFrame() {
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if (_frameRead) {
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av_frame_unref(_frame);
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_frameRead = false;
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}
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do {
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int res = avcodec_receive_frame(_codecContext, _frame);
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if (res >= 0) {
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processReadFrame();
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return ReadResult::Success;
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}
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if (res == AVERROR_EOF) {
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clearPacketQueue();
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if (_mode == Mode::Normal) {
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return ReadResult::EndOfFile;
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}
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if (!_hadFrame) {
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LOG(("Gif Error: Got EOF before a single frame was read!"));
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return ReadResult::Error;
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}
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if ((res = avformat_seek_file(_fmtContext, _streamId, std::numeric_limits<int64_t>::min(), 0, std::numeric_limits<int64_t>::max(), 0)) < 0) {
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if ((res = av_seek_frame(_fmtContext, _streamId, 0, AVSEEK_FLAG_BYTE)) < 0) {
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if ((res = av_seek_frame(_fmtContext, _streamId, 0, AVSEEK_FLAG_FRAME)) < 0) {
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if ((res = av_seek_frame(_fmtContext, _streamId, 0, 0)) < 0) {
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char err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
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LOG(("Gif Error: Unable to av_seek_frame() to the start %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return ReadResult::Error;
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}
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}
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}
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}
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avcodec_flush_buffers(_codecContext);
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_hadFrame = false;
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_frameMs = 0;
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_lastReadVideoMs = _lastReadAudioMs = 0;
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_skippedInvalidDataPackets = 0;
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continue;
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} else if (res != AVERROR(EAGAIN)) {
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char err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
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LOG(("Gif Error: Unable to avcodec_receive_frame() %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return ReadResult::Error;
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}
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while (_packetQueue.isEmpty()) {
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auto packetResult = readAndProcessPacket();
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if (packetResult == PacketResult::Error) {
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return ReadResult::Error;
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} else if (packetResult == PacketResult::EndOfFile) {
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break;
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}
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}
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if (_packetQueue.isEmpty()) {
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avcodec_send_packet(_codecContext, nullptr); // drain
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continue;
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}
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startPacket();
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AVPacket packet;
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FFMpeg::packetFromDataWrap(packet, _packetQueue.head());
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res = avcodec_send_packet(_codecContext, &packet);
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if (res < 0) {
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finishPacket();
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char err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
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LOG(("Gif Error: Unable to avcodec_send_packet() %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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if (res == AVERROR_INVALIDDATA) {
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if (++_skippedInvalidDataPackets < kSkipInvalidDataPackets) {
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continue; // try to skip bad packet
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}
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}
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return ReadResult::Error;
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}
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finishPacket();
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} while (true);
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return ReadResult::Error;
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}
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void FFMpegReaderImplementation::processReadFrame() {
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int64 duration = _frame->pkt_duration;
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int64 framePts = _frame->pts;
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TimeMs frameMs = (framePts * 1000LL * _fmtContext->streams[_streamId]->time_base.num) / _fmtContext->streams[_streamId]->time_base.den;
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_currentFrameDelay = _nextFrameDelay;
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if (_frameMs + _currentFrameDelay < frameMs) {
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_currentFrameDelay = int32(frameMs - _frameMs);
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} else if (frameMs < _frameMs + _currentFrameDelay) {
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frameMs = _frameMs + _currentFrameDelay;
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}
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if (duration == AV_NOPTS_VALUE) {
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_nextFrameDelay = 0;
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} else {
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_nextFrameDelay = (duration * 1000LL * _fmtContext->streams[_streamId]->time_base.num) / _fmtContext->streams[_streamId]->time_base.den;
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}
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_frameMs = frameMs;
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_hadFrame = _frameRead = true;
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_frameTime += _currentFrameDelay;
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}
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ReaderImplementation::ReadResult FFMpegReaderImplementation::readFramesTill(TimeMs frameMs, TimeMs systemMs) {
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if (_audioStreamId < 0) { // just keep up
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if (_frameRead && _frameTime > frameMs) {
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return ReadResult::Success;
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}
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auto readResult = readNextFrame();
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if (readResult != ReadResult::Success || _frameTime > frameMs) {
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return readResult;
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}
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readResult = readNextFrame();
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if (_frameTime <= frameMs) {
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_frameTime = frameMs + 5; // keep up
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}
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return readResult;
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}
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// sync by audio stream
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auto correctMs = (frameMs >= 0) ? Player::mixer()->getVideoCorrectedTime(_audioMsgId, frameMs, systemMs) : frameMs;
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if (!_frameRead) {
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auto readResult = readNextFrame();
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if (readResult != ReadResult::Success) {
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return readResult;
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}
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}
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while (_frameTime <= correctMs) {
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auto readResult = readNextFrame();
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if (readResult != ReadResult::Success) {
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return readResult;
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}
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}
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if (frameMs >= 0) {
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_frameTimeCorrection = frameMs - correctMs;
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}
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return ReadResult::Success;
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}
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TimeMs FFMpegReaderImplementation::frameRealTime() const {
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return _frameMs;
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}
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TimeMs FFMpegReaderImplementation::framePresentationTime() const {
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return qMax(_frameTime + _frameTimeCorrection, 0LL);
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}
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TimeMs FFMpegReaderImplementation::durationMs() const {
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if (_fmtContext->streams[_streamId]->duration == AV_NOPTS_VALUE) return 0;
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return (_fmtContext->streams[_streamId]->duration * 1000LL * _fmtContext->streams[_streamId]->time_base.num) / _fmtContext->streams[_streamId]->time_base.den;
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}
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bool FFMpegReaderImplementation::renderFrame(QImage &to, bool &hasAlpha, const QSize &size) {
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Expects(_frameRead);
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_frameRead = false;
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if (!_width || !_height) {
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_width = _frame->width;
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_height = _frame->height;
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if (!_width || !_height) {
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LOG(("Gif Error: Bad frame size %1").arg(logData()));
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return false;
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}
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}
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QSize toSize(size.isEmpty() ? QSize(_width, _height) : size);
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if (!size.isEmpty() && rotationSwapWidthHeight()) {
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toSize.transpose();
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}
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if (to.isNull() || to.size() != toSize || !to.isDetached() || !isAlignedImage(to)) {
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to = createAlignedImage(toSize);
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}
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hasAlpha = (_frame->format == AV_PIX_FMT_BGRA || (_frame->format == -1 && _codecContext->pix_fmt == AV_PIX_FMT_BGRA));
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if (_frame->width == toSize.width() && _frame->height == toSize.height() && hasAlpha) {
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int32 sbpl = _frame->linesize[0], dbpl = to.bytesPerLine(), bpl = qMin(sbpl, dbpl);
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uchar *s = _frame->data[0], *d = to.bits();
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for (int32 i = 0, l = _frame->height; i < l; ++i) {
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memcpy(d + i * dbpl, s + i * sbpl, bpl);
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}
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} else {
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if ((_swsSize != toSize) || (_frame->format != -1 && _frame->format != _codecContext->pix_fmt) || !_swsContext) {
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_swsSize = toSize;
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_swsContext = sws_getCachedContext(_swsContext, _frame->width, _frame->height, AVPixelFormat(_frame->format), toSize.width(), toSize.height(), AV_PIX_FMT_BGRA, 0, 0, 0, 0);
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}
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// AV_NUM_DATA_POINTERS defined in AVFrame struct
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uint8_t *toData[AV_NUM_DATA_POINTERS] = { to.bits(), nullptr };
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int toLinesize[AV_NUM_DATA_POINTERS] = { to.bytesPerLine(), 0 };
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int res;
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if ((res = sws_scale(_swsContext, _frame->data, _frame->linesize, 0, _frame->height, toData, toLinesize)) != _swsSize.height()) {
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LOG(("Gif Error: Unable to sws_scale to good size %1, height %2, should be %3").arg(logData()).arg(res).arg(_swsSize.height()));
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return false;
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}
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}
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if (_rotation != Rotation::None) {
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QTransform rotationTransform;
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switch (_rotation) {
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case Rotation::Degrees90: rotationTransform.rotate(90); break;
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case Rotation::Degrees180: rotationTransform.rotate(180); break;
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case Rotation::Degrees270: rotationTransform.rotate(270); break;
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}
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to = to.transformed(rotationTransform);
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}
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// Read some future packets for audio stream.
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if (_audioStreamId >= 0) {
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while (_frameMs + 5000 > _lastReadAudioMs
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&& _frameMs + 15000 > _lastReadVideoMs) {
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auto packetResult = readAndProcessPacket();
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if (packetResult != PacketResult::Ok) {
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break;
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}
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}
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}
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av_frame_unref(_frame);
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return true;
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}
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FFMpegReaderImplementation::Rotation FFMpegReaderImplementation::rotationFromDegrees(int degrees) const {
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switch (degrees) {
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case 90: return Rotation::Degrees90;
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case 180: return Rotation::Degrees180;
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case 270: return Rotation::Degrees270;
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}
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return Rotation::None;
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}
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bool FFMpegReaderImplementation::start(Mode mode, TimeMs &positionMs) {
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_mode = mode;
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initDevice();
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if (!_device->open(QIODevice::ReadOnly)) {
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LOG(("Gif Error: Unable to open device %1").arg(logData()));
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return false;
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}
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_ioBuffer = (uchar*)av_malloc(AVBlockSize);
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_ioContext = avio_alloc_context(_ioBuffer, AVBlockSize, 0, static_cast<void*>(this), &FFMpegReaderImplementation::_read, 0, &FFMpegReaderImplementation::_seek);
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_fmtContext = avformat_alloc_context();
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if (!_fmtContext) {
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LOG(("Gif Error: Unable to avformat_alloc_context %1").arg(logData()));
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return false;
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}
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_fmtContext->pb = _ioContext;
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int res = 0;
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char err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
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if ((res = avformat_open_input(&_fmtContext, 0, 0, 0)) < 0) {
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_ioBuffer = 0;
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LOG(("Gif Error: Unable to avformat_open_input %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return false;
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}
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_opened = true;
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if ((res = avformat_find_stream_info(_fmtContext, 0)) < 0) {
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LOG(("Gif Error: Unable to avformat_find_stream_info %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return false;
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}
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_streamId = av_find_best_stream(_fmtContext, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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if (_streamId < 0) {
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LOG(("Gif Error: Unable to av_find_best_stream %1, error %2, %3").arg(logData()).arg(_streamId).arg(av_make_error_string(err, sizeof(err), _streamId)));
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return false;
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}
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_packetNull.stream_index = _streamId;
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auto rotateTag = av_dict_get(_fmtContext->streams[_streamId]->metadata, "rotate", NULL, 0);
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if (rotateTag && *rotateTag->value) {
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auto stringRotateTag = QString::fromUtf8(rotateTag->value);
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auto toIntSucceeded = false;
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auto rotateDegrees = stringRotateTag.toInt(&toIntSucceeded);
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if (toIntSucceeded) {
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_rotation = rotationFromDegrees(rotateDegrees);
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}
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}
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_codecContext = avcodec_alloc_context3(nullptr);
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if (!_codecContext) {
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LOG(("Gif Error: Unable to avcodec_alloc_context3 %1").arg(logData()));
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return false;
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}
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if ((res = avcodec_parameters_to_context(_codecContext, _fmtContext->streams[_streamId]->codecpar)) < 0) {
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LOG(("Gif Error: Unable to avcodec_parameters_to_context %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return false;
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}
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av_codec_set_pkt_timebase(_codecContext, _fmtContext->streams[_streamId]->time_base);
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av_opt_set_int(_codecContext, "refcounted_frames", 1, 0);
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_codec = avcodec_find_decoder(_codecContext->codec_id);
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_audioStreamId = av_find_best_stream(_fmtContext, AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
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if (_mode == Mode::Inspecting) {
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_hasAudioStream = (_audioStreamId >= 0);
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_audioStreamId = -1;
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} else if (_mode == Mode::Silent || !_audioMsgId.playId()) {
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_audioStreamId = -1;
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}
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if ((res = avcodec_open2(_codecContext, _codec, 0)) < 0) {
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LOG(("Gif Error: Unable to avcodec_open2 %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return false;
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}
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std::unique_ptr<VideoSoundData> soundData;
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if (_audioStreamId >= 0) {
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auto audioContext = avcodec_alloc_context3(nullptr);
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if (!audioContext) {
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LOG(("Audio Error: Unable to avcodec_alloc_context3 %1").arg(logData()));
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return false;
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}
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if ((res = avcodec_parameters_to_context(audioContext, _fmtContext->streams[_audioStreamId]->codecpar)) < 0) {
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LOG(("Audio Error: Unable to avcodec_parameters_to_context %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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return false;
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}
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av_codec_set_pkt_timebase(audioContext, _fmtContext->streams[_audioStreamId]->time_base);
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av_opt_set_int(audioContext, "refcounted_frames", 1, 0);
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auto audioCodec = avcodec_find_decoder(audioContext->codec_id);
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if ((res = avcodec_open2(audioContext, audioCodec, 0)) < 0) {
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avcodec_free_context(&audioContext);
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LOG(("Gif Error: Unable to avcodec_open2 %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
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_audioStreamId = -1;
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} else {
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soundData = std::make_unique<VideoSoundData>();
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soundData->context = audioContext;
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soundData->frequency = _fmtContext->streams[_audioStreamId]->codecpar->sample_rate;
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if (_fmtContext->streams[_audioStreamId]->duration == AV_NOPTS_VALUE) {
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soundData->length = (_fmtContext->duration * soundData->frequency) / AV_TIME_BASE;
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} else {
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soundData->length = (_fmtContext->streams[_audioStreamId]->duration * soundData->frequency * _fmtContext->streams[_audioStreamId]->time_base.num) / _fmtContext->streams[_audioStreamId]->time_base.den;
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}
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}
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}
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if (positionMs > 0) {
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const auto timeBase = _fmtContext->streams[_streamId]->time_base;
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const auto timeStamp = (positionMs * timeBase.den)
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/ (1000LL * timeBase.num);
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if (av_seek_frame(_fmtContext, _streamId, timeStamp, 0) < 0) {
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if (av_seek_frame(_fmtContext, _streamId, timeStamp, AVSEEK_FLAG_BACKWARD) < 0) {
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return false;
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}
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}
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}
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AVPacket packet;
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auto readResult = readPacket(&packet);
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if (readResult == PacketResult::Ok && positionMs > 0) {
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positionMs = countPacketMs(&packet);
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}
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if (hasAudio()) {
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Player::mixer()->play(_audioMsgId, std::move(soundData), positionMs);
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}
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if (readResult == PacketResult::Ok) {
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processPacket(&packet);
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}
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return true;
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}
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bool FFMpegReaderImplementation::inspectAt(TimeMs &positionMs) {
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if (positionMs > 0) {
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const auto timeBase = _fmtContext->streams[_streamId]->time_base;
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const auto timeStamp = (positionMs * timeBase.den)
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/ (1000LL * timeBase.num);
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if (av_seek_frame(_fmtContext, _streamId, timeStamp, 0) < 0) {
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if (av_seek_frame(_fmtContext, _streamId, timeStamp, AVSEEK_FLAG_BACKWARD) < 0) {
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return false;
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}
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}
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}
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|
_packetQueue.clear();
|
|
|
|
AVPacket packet;
|
|
auto readResult = readPacket(&packet);
|
|
if (readResult == PacketResult::Ok && positionMs > 0) {
|
|
positionMs = countPacketMs(&packet);
|
|
}
|
|
|
|
if (readResult == PacketResult::Ok) {
|
|
processPacket(&packet);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool FFMpegReaderImplementation::isGifv() const {
|
|
if (_hasAudioStream) {
|
|
return false;
|
|
}
|
|
if (dataSize() > Storage::kMaxAnimationInMemory) {
|
|
return false;
|
|
}
|
|
if (_codecContext->codec_id != AV_CODEC_ID_H264) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
QString FFMpegReaderImplementation::logData() const {
|
|
return qsl("for file '%1', data size '%2'").arg(_location ? _location->name() : QString()).arg(_data->size());
|
|
}
|
|
|
|
FFMpegReaderImplementation::~FFMpegReaderImplementation() {
|
|
clearPacketQueue();
|
|
|
|
if (_frameRead) {
|
|
av_frame_unref(_frame);
|
|
_frameRead = false;
|
|
}
|
|
if (_codecContext) avcodec_free_context(&_codecContext);
|
|
if (_swsContext) sws_freeContext(_swsContext);
|
|
if (_opened) {
|
|
avformat_close_input(&_fmtContext);
|
|
}
|
|
if (_ioContext) {
|
|
av_freep(&_ioContext->buffer);
|
|
av_freep(&_ioContext);
|
|
} else if (_ioBuffer) {
|
|
av_freep(&_ioBuffer);
|
|
}
|
|
if (_fmtContext) avformat_free_context(_fmtContext);
|
|
av_frame_free(&_frame);
|
|
}
|
|
|
|
FFMpegReaderImplementation::PacketResult FFMpegReaderImplementation::readPacket(AVPacket *packet) {
|
|
av_init_packet(packet);
|
|
packet->data = nullptr;
|
|
packet->size = 0;
|
|
|
|
int res = 0;
|
|
if ((res = av_read_frame(_fmtContext, packet)) < 0) {
|
|
if (res == AVERROR_EOF) {
|
|
if (_audioStreamId >= 0) {
|
|
// queue terminating packet to audio player
|
|
VideoSoundPart part;
|
|
part.packet = &_packetNull;
|
|
part.audio = _audioMsgId;
|
|
Player::mixer()->feedFromVideo(std::move(part));
|
|
}
|
|
return PacketResult::EndOfFile;
|
|
}
|
|
char err[AV_ERROR_MAX_STRING_SIZE] = { 0 };
|
|
LOG(("Gif Error: Unable to av_read_frame() %1, error %2, %3").arg(logData()).arg(res).arg(av_make_error_string(err, sizeof(err), res)));
|
|
return PacketResult::Error;
|
|
}
|
|
return PacketResult::Ok;
|
|
}
|
|
|
|
void FFMpegReaderImplementation::processPacket(AVPacket *packet) {
|
|
auto videoPacket = (packet->stream_index == _streamId);
|
|
auto audioPacket = (_audioStreamId >= 0 && packet->stream_index == _audioStreamId);
|
|
if (audioPacket || videoPacket) {
|
|
if (videoPacket) {
|
|
_lastReadVideoMs = countPacketMs(packet);
|
|
|
|
_packetQueue.enqueue(FFMpeg::dataWrapFromPacket(*packet));
|
|
} else if (audioPacket) {
|
|
_lastReadAudioMs = countPacketMs(packet);
|
|
|
|
// queue packet to audio player
|
|
VideoSoundPart part;
|
|
part.packet = packet;
|
|
part.audio = _audioMsgId;
|
|
Player::mixer()->feedFromVideo(std::move(part));
|
|
}
|
|
} else {
|
|
av_packet_unref(packet);
|
|
}
|
|
}
|
|
|
|
TimeMs FFMpegReaderImplementation::countPacketMs(AVPacket *packet) const {
|
|
int64 packetPts = (packet->pts == AV_NOPTS_VALUE) ? packet->dts : packet->pts;
|
|
TimeMs packetMs = (packetPts * 1000LL * _fmtContext->streams[packet->stream_index]->time_base.num) / _fmtContext->streams[packet->stream_index]->time_base.den;
|
|
return packetMs;
|
|
}
|
|
|
|
FFMpegReaderImplementation::PacketResult FFMpegReaderImplementation::readAndProcessPacket() {
|
|
AVPacket packet;
|
|
auto result = readPacket(&packet);
|
|
if (result == PacketResult::Ok) {
|
|
processPacket(&packet);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void FFMpegReaderImplementation::startPacket() {
|
|
if (!_packetStarted && !_packetQueue.isEmpty()) {
|
|
AVPacket packet;
|
|
FFMpeg::packetFromDataWrap(packet, _packetQueue.head());
|
|
_packetStartedSize = packet.size;
|
|
_packetStartedData = packet.data;
|
|
_packetStarted = true;
|
|
}
|
|
}
|
|
|
|
void FFMpegReaderImplementation::finishPacket() {
|
|
if (_packetStarted) {
|
|
AVPacket packet;
|
|
FFMpeg::packetFromDataWrap(packet, _packetQueue.head());
|
|
packet.size = _packetStartedSize;
|
|
packet.data = _packetStartedData;
|
|
_packetStarted = false;
|
|
av_packet_unref(&packet);
|
|
_packetQueue.dequeue();
|
|
}
|
|
}
|
|
|
|
void FFMpegReaderImplementation::clearPacketQueue() {
|
|
finishPacket();
|
|
auto packets = base::take(_packetQueue);
|
|
for (auto &packetData : packets) {
|
|
AVPacket packet;
|
|
FFMpeg::packetFromDataWrap(packet, packetData);
|
|
av_packet_unref(&packet);
|
|
}
|
|
}
|
|
|
|
int FFMpegReaderImplementation::_read(void *opaque, uint8_t *buf, int buf_size) {
|
|
FFMpegReaderImplementation *l = reinterpret_cast<FFMpegReaderImplementation*>(opaque);
|
|
return int(l->_device->read((char*)(buf), buf_size));
|
|
}
|
|
|
|
int64_t FFMpegReaderImplementation::_seek(void *opaque, int64_t offset, int whence) {
|
|
FFMpegReaderImplementation *l = reinterpret_cast<FFMpegReaderImplementation*>(opaque);
|
|
|
|
switch (whence) {
|
|
case SEEK_SET: return l->_device->seek(offset) ? l->_device->pos() : -1;
|
|
case SEEK_CUR: return l->_device->seek(l->_device->pos() + offset) ? l->_device->pos() : -1;
|
|
case SEEK_END: return l->_device->seek(l->_device->size() + offset) ? l->_device->pos() : -1;
|
|
case AVSEEK_SIZE: {
|
|
// Special whence for determining filesize without any seek.
|
|
return l->_dataSize;
|
|
} break;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
} // namespace internal
|
|
} // namespace Clip
|
|
} // namespace Media
|