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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "playbackengine/qffmpegcodec_p.h"
#include "qloggingcategory.h"
QT_BEGIN_NAMESPACE
static Q_LOGGING_CATEGORY(qLcPlaybackEngineCodec, "qt.multimedia.playbackengine.codec");
namespace QFFmpeg {
Codec::Data::Data(AVCodecContextUPtr context, AVStream *stream, AVFormatContext *formatContext,
std::unique_ptr<QFFmpeg::HWAccel> hwAccel)
: context(std::move(context)), stream(stream), hwAccel(std::move(hwAccel))
{
if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
pixelAspectRatio = av_guess_sample_aspect_ratio(formatContext, stream, nullptr);
}
Codec::Data::~Data()
{
// TODO: investigate if we can remove avcodec_close
// FFmpeg doc says that avcodec_free_context is enough
avcodec_close(context.get());
}
QMaybe<Codec> Codec::create(AVStream *stream, AVFormatContext *formatContext)
{
if (!stream)
return { "Invalid stream" };
const AVCodec *decoder = nullptr;
std::unique_ptr<QFFmpeg::HWAccel> hwAccel;
if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
std::tie(decoder, hwAccel) = HWAccel::findDecoderWithHwAccel(stream->codecpar->codec_id);
if (!decoder)
decoder = QFFmpeg::findAVDecoder(stream->codecpar->codec_id);
if (!decoder)
return { "Failed to find a valid FFmpeg decoder" };
qCDebug(qLcPlaybackEngineCodec) << "found decoder" << decoder->name << "for id" << decoder->id;
AVCodecContextUPtr context(avcodec_alloc_context3(decoder));
if (!context)
return { "Failed to allocate a FFmpeg codec context" };
if (hwAccel)
context->hw_device_ctx = av_buffer_ref(hwAccel->hwDeviceContextAsBuffer());
if (context->codec_type != AVMEDIA_TYPE_AUDIO && context->codec_type != AVMEDIA_TYPE_VIDEO
&& context->codec_type != AVMEDIA_TYPE_SUBTITLE) {
return { "Unknown codec type" };
}
int ret = avcodec_parameters_to_context(context.get(), stream->codecpar);
if (ret < 0)
return { "Failed to set FFmpeg codec parameters" };
// ### This still gives errors about wrong HW formats (as we accept all of them)
// But it would be good to get so we can filter out pixel format we don't support natively
context->get_format = QFFmpeg::getFormat;
/* Init the decoder, with reference counting and threading */
AVDictionaryHolder opts;
av_dict_set(opts, "refcounted_frames", "1", 0);
av_dict_set(opts, "threads", "auto", 0);
applyExperimentalCodecOptions(decoder, opts);
ret = avcodec_open2(context.get(), decoder, opts);
if (ret < 0)
return QString("Failed to open FFmpeg codec context " + err2str(ret));
return Codec(new Data(std::move(context), stream, formatContext, std::move(hwAccel)));
}
AVRational Codec::pixelAspectRatio(AVFrame *frame) const
{
// does the same as av_guess_sample_aspect_ratio, but more efficient
return d->pixelAspectRatio.num && d->pixelAspectRatio.den ? d->pixelAspectRatio
: frame->sample_aspect_ratio;
}
QT_END_NAMESPACE
} // namespace QFFmpeg
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