1 files changed, 82 insertions, 0 deletions
diff --git a/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegcodec.cpp b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegcodec.cpp
new file mode 100644
index 000000000..457b3603d
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/playbackengine/qffmpegcodec.cpp
@@ -0,0 +1,82 @@
+// 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);
+}
+
+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