tdesktop/Telegram/SourceFiles/media/streaming/media_streaming_utility.cpp

449 lines
12 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "media/streaming/media_streaming_utility.h"
#include "media/streaming/media_streaming_common.h"
#include "ui/image/image_prepare.h"
#include "ui/painter.h"
#include "ffmpeg/ffmpeg_utility.h"
namespace Media {
namespace Streaming {
namespace {
constexpr auto kSkipInvalidDataPackets = 10;
} // namespace
crl::time FramePosition(const Stream &stream) {
const auto pts = !stream.decodedFrame
? AV_NOPTS_VALUE
: (stream.decodedFrame->best_effort_timestamp != AV_NOPTS_VALUE)
? stream.decodedFrame->best_effort_timestamp
: (stream.decodedFrame->pts != AV_NOPTS_VALUE)
? stream.decodedFrame->pts
: stream.decodedFrame->pkt_dts;
const auto result = FFmpeg::PtsToTime(pts, stream.timeBase);
// Sometimes the result here may be larger than the stream duration.
return (stream.duration == kDurationUnavailable)
? result
: std::min(result, stream.duration);
}
FFmpeg::AvErrorWrap ProcessPacket(Stream &stream, FFmpeg::Packet &&packet) {
Expects(stream.codec != nullptr);
auto error = FFmpeg::AvErrorWrap();
const auto native = &packet.fields();
const auto guard = gsl::finally([
&,
size = native->size,
data = native->data
] {
native->size = size;
native->data = data;
packet = FFmpeg::Packet();
});
error = avcodec_send_packet(
stream.codec.get(),
native->data ? native : nullptr); // Drain on eof.
if (error) {
LogError(u"avcodec_send_packet"_q, error);
if (error.code() == AVERROR_INVALIDDATA
// There is a sample voice message where skipping such packet
// results in a crash (read_access to nullptr) in swr_convert().
&& stream.codec->codec_id != AV_CODEC_ID_OPUS) {
if (++stream.invalidDataPackets < kSkipInvalidDataPackets) {
return FFmpeg::AvErrorWrap(); // Try to skip a bad packet.
}
}
} else {
stream.invalidDataPackets = 0;
}
return error;
}
FFmpeg::AvErrorWrap ReadNextFrame(Stream &stream) {
Expects(stream.decodedFrame != nullptr);
auto error = FFmpeg::AvErrorWrap();
do {
error = avcodec_receive_frame(
stream.codec.get(),
stream.decodedFrame.get());
if (!error
|| error.code() != AVERROR(EAGAIN)
|| stream.queue.empty()) {
return error;
}
error = ProcessPacket(stream, std::move(stream.queue.front()));
stream.queue.pop_front();
} while (!error);
return error;
}
bool GoodForRequest(
const QImage &image,
bool hasAlpha,
int rotation,
const FrameRequest &request) {
if (image.isNull()
|| (hasAlpha && !request.keepAlpha)
|| request.colored.alpha() != 0) {
return false;
} else if (!request.blurredBackground && request.resize.isEmpty()) {
return true;
} else if (rotation != 0) {
return false;
} else if (!request.rounding.empty() || !request.mask.isNull()) {
return false;
}
const auto size = request.blurredBackground
? request.outer
: request.resize;
return (size == request.outer) && (size == image.size());
}
bool TransferFrame(
Stream &stream,
not_null<AVFrame*> decodedFrame,
not_null<AVFrame*> transferredFrame) {
Expects(decodedFrame->hw_frames_ctx != nullptr);
const auto error = FFmpeg::AvErrorWrap(
av_hwframe_transfer_data(transferredFrame, decodedFrame, 0));
if (error) {
LogError(u"av_hwframe_transfer_data"_q, error);
return false;
}
FFmpeg::ClearFrameMemory(decodedFrame);
return true;
}
QImage ConvertFrame(
Stream &stream,
not_null<AVFrame*> frame,
QSize resize,
QImage storage) {
const auto frameSize = QSize(frame->width, frame->height);
if (frameSize.isEmpty()) {
LOG(("Streaming Error: Bad frame size %1,%2"
).arg(frameSize.width()
).arg(frameSize.height()));
return QImage();
} else if (!FFmpeg::FrameHasData(frame)) {
LOG(("Streaming Error: Bad frame data."));
return QImage();
}
if (resize.isEmpty()) {
resize = frameSize;
} else if (FFmpeg::RotationSwapWidthHeight(stream.rotation)) {
resize.transpose();
}
if (!FFmpeg::GoodStorageForFrame(storage, resize)) {
storage = FFmpeg::CreateFrameStorage(resize);
}
const auto format = AV_PIX_FMT_BGRA;
const auto hasDesiredFormat = (frame->format == format);
if (frameSize == storage.size() && hasDesiredFormat) {
static_assert(sizeof(uint32) == FFmpeg::kPixelBytesSize);
auto to = reinterpret_cast<uint32*>(storage.bits());
auto from = reinterpret_cast<const uint32*>(frame->data[0]);
const auto deltaTo = (storage.bytesPerLine() / sizeof(uint32))
- storage.width();
const auto deltaFrom = (frame->linesize[0] / sizeof(uint32))
- frame->width;
for ([[maybe_unused]] const auto y : ranges::views::ints(0, frame->height)) {
for ([[maybe_unused]] const auto x : ranges::views::ints(0, frame->width)) {
// Wipe out possible alpha values.
*to++ = 0xFF000000U | *from++;
}
to += deltaTo;
from += deltaFrom;
}
} else {
stream.swscale = MakeSwscalePointer(
frame,
resize,
&stream.swscale);
if (!stream.swscale) {
return QImage();
}
// AV_NUM_DATA_POINTERS defined in AVFrame struct
uint8_t *data[AV_NUM_DATA_POINTERS] = { storage.bits(), nullptr };
int linesize[AV_NUM_DATA_POINTERS] = { int(storage.bytesPerLine()), 0 };
sws_scale(
stream.swscale.get(),
frame->data,
frame->linesize,
0,
frame->height,
data,
linesize);
if (frame->format == AV_PIX_FMT_YUVA420P) {
FFmpeg::PremultiplyInplace(storage);
}
}
FFmpeg::ClearFrameMemory(frame);
return storage;
}
FrameYUV ExtractYUV(Stream &stream, AVFrame *frame) {
return {
.size = { frame->width, frame->height },
.chromaSize = {
AV_CEIL_RSHIFT(frame->width, 1), // SWScale does that.
AV_CEIL_RSHIFT(frame->height, 1)
},
.y = { .data = frame->data[0], .stride = frame->linesize[0] },
.u = { .data = frame->data[1], .stride = frame->linesize[1] },
.v = { .data = frame->data[2], .stride = frame->linesize[2] },
};
}
void PaintFrameOuter(QPainter &p, const QRect &inner, QSize outer) {
const auto left = inner.x();
const auto right = outer.width() - inner.width() - left;
const auto top = inner.y();
const auto bottom = outer.height() - inner.height() - top;
if (left > 0) {
p.fillRect(0, 0, left, outer.height(), st::imageBg);
}
if (right > 0) {
p.fillRect(
outer.width() - right,
0,
right,
outer.height(),
st::imageBg);
}
if (top > 0) {
p.fillRect(left, 0, inner.width(), top, st::imageBg);
}
if (bottom > 0) {
p.fillRect(
left,
outer.height() - bottom,
inner.width(),
bottom,
st::imageBg);
}
}
void PaintFrameInner(
QPainter &p,
QRect to,
const QImage &original,
bool alpha,
int rotation) {
const auto rotated = [](QRect rect, int rotation) {
switch (rotation) {
case 0: return rect;
case 90: return QRect(
rect.y(),
-rect.x() - rect.width(),
rect.height(),
rect.width());
case 180: return QRect(
-rect.x() - rect.width(),
-rect.y() - rect.height(),
rect.width(),
rect.height());
case 270: return QRect(
-rect.y() - rect.height(),
rect.x(),
rect.height(),
rect.width());
}
Unexpected("Rotation in PaintFrameInner.");
};
PainterHighQualityEnabler hq(p);
if (rotation) {
p.rotate(rotation);
}
const auto rect = rotated(to, rotation);
if (alpha) {
p.fillRect(rect, Qt::white);
}
p.drawImage(rect, original);
}
QImage PrepareBlurredBackground(QSize outer, QImage frame) {
const auto bsize = frame.size();
const auto copyw = std::min(
bsize.width(),
std::max(outer.width() * bsize.height() / outer.height(), 1));
const auto copyh = std::min(
bsize.height(),
std::max(outer.height() * bsize.width() / outer.width(), 1));
auto copy = (bsize == QSize(copyw, copyh))
? std::move(frame)
: frame.copy(
(bsize.width() - copyw) / 2,
(bsize.height() - copyh) / 2,
copyw,
copyh);
auto scaled = (copy.width() <= 100 && copy.height() <= 100)
? std::move(copy)
: copy.scaled(40, 40, Qt::KeepAspectRatio, Qt::FastTransformation);
return Images::Blur(std::move(scaled), true);
}
void FillBlurredBackground(QPainter &p, QSize outer, QImage bg) {
auto hq = PainterHighQualityEnabler(p);
const auto rect = QRect(QPoint(), outer);
const auto ratio = p.device()->devicePixelRatio();
p.drawImage(
rect,
PrepareBlurredBackground(outer * ratio, std::move(bg)));
p.fillRect(rect, QColor(0, 0, 0, 48));
}
void PaintFrameContent(
QPainter &p,
const QImage &original,
bool hasAlpha,
const AVRational &aspect,
int rotation,
const FrameRequest &request) {
const auto outer = request.outer;
const auto full = request.outer.isEmpty() ? original.size() : outer;
const auto deAlpha = hasAlpha && !request.keepAlpha;
const auto resize = request.blurredBackground
? DecideVideoFrameResize(
outer,
FFmpeg::TransposeSizeByRotation(
FFmpeg::CorrectByAspect(original.size(), aspect), rotation))
: ExpandDecision{ request.resize.isEmpty()
? original.size()
: request.resize };
const auto size = resize.result;
const auto target = QRect(
(full.width() - size.width()) / 2,
(full.height() - size.height()) / 2,
size.width(),
size.height());
if (request.blurredBackground) {
if (!resize.expanding) {
FillBlurredBackground(p, full, original);
}
} else if (!hasAlpha || !request.keepAlpha) {
PaintFrameOuter(p, target, full);
}
PaintFrameInner(p, target, original, deAlpha, rotation);
}
void ApplyFrameRounding(QImage &storage, const FrameRequest &request) {
if (!request.mask.isNull()) {
auto p = QPainter(&storage);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.drawImage(
QRect(QPoint(), storage.size() / storage.devicePixelRatio()),
request.mask);
} else if (!request.rounding.empty()) {
storage = Images::Round(std::move(storage), request.rounding);
}
}
ExpandDecision DecideFrameResize(
QSize outer,
QSize original,
int minVisibleNominator,
int minVisibleDenominator) {
if (outer.isEmpty()) {
// Often "expanding" means that we don't need to fill the background.
return { .result = original, .expanding = true };
}
const auto big = original.scaled(outer, Qt::KeepAspectRatioByExpanding);
if ((big.width() <= outer.width())
&& (big.height() * minVisibleNominator
<= outer.height() * minVisibleDenominator)) {
return { .result = big, .expanding = true };
}
return { .result = original.scaled(outer, Qt::KeepAspectRatio) };
}
bool FrameResizeMayExpand(
QSize outer,
QSize original,
int minVisibleNominator,
int minVisibleDenominator) {
const auto min = std::min({
outer.width(),
outer.height(),
original.width(),
original.height(),
});
// Count for: (nominator / denominator) - (1 / min).
// In case the result is less than 1 / 2, just return.
if (2 * minVisibleNominator * min
< 2 * minVisibleDenominator + minVisibleDenominator * min) {
return false;
}
return DecideFrameResize(
outer,
original,
minVisibleNominator * min - minVisibleDenominator,
minVisibleDenominator * min).expanding;
}
ExpandDecision DecideVideoFrameResize(QSize outer, QSize original) {
return DecideFrameResize(outer, original, 1, 2);
}
QSize CalculateResizeFromOuter(QSize outer, QSize original) {
return DecideVideoFrameResize(outer, original).result;
}
QImage PrepareByRequest(
const QImage &original,
bool hasAlpha,
const AVRational &aspect,
int rotation,
const FrameRequest &request,
QImage storage) {
Expects(!request.outer.isEmpty() || hasAlpha);
const auto outer = request.outer.isEmpty()
? original.size()
: request.outer;
if (!FFmpeg::GoodStorageForFrame(storage, outer)) {
storage = FFmpeg::CreateFrameStorage(outer);
}
if (hasAlpha && request.keepAlpha) {
storage.fill(Qt::transparent);
}
QPainter p(&storage);
PaintFrameContent(p, original, hasAlpha, aspect, rotation, request);
p.end();
ApplyFrameRounding(storage, request);
if (request.colored.alpha() != 0) {
storage = Images::Colored(std::move(storage), request.colored);
}
return storage;
}
} // namespace Streaming
} // namespace Media