itsmattkc
af702835da
Rather than convoluting the MediaInput node, te MediaInput is now an abstract base class that provides access to a Decoder and derived classes are responsible for handling it
151 lines
4.1 KiB
C++
151 lines
4.1 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2019 Olive Team
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#ifndef FFMPEGDECODER_H
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#define FFMPEGDECODER_H
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extern "C" {
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#include <libavformat/avformat.h>
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#include <libswscale/swscale.h>
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#include <libswresample/swresample.h>
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}
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#include <QVector>
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#include "decoder/decoder.h"
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#include "audio/sampleformat.h"
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/**
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* @brief A Decoder derivative that wraps FFmpeg functions as on Olive decoder
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*/
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class FFmpegDecoder : public Decoder
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{
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public:
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// Constructor
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FFmpegDecoder();
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// Destructor
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virtual ~FFmpegDecoder() override;
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virtual bool Probe(Footage *f) override;
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virtual bool Open() override;
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virtual FramePtr Retrieve(const rational &timecode, const rational &length = 0) override;
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virtual void Close() override;
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virtual QString id() override;
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virtual int64_t GetTimestampFromTime(const rational& time) override;
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private:
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/**
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* @brief Handle an error
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*
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* Immediately closes the Decoder (freeing memory resources) and sends the string provided to the warning stream.
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* As this function closes the Decoder, no further Decoder functions should be performed after this is called
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* (unless the Decoder is opened again first).
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*/
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void Error(const QString& s);
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/**
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* @brief Handle an FFmpeg error code
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*
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* Uses the FFmpeg API to retrieve a descriptive string for this error code and sends it to Error(). As such, this
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* function also automatically closes the Decoder.
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*
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* @param error_code
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*/
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void FFmpegError(int error_code);
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/**
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* @brief Uses the FFmpeg API to retrieve a packet (stored in pkt_) and decode it (stored in frame_)
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*
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* @return
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*
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* An FFmpeg error code, or >= 0 on success
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*/
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int GetFrame();
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/**
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* @brief Create an index for this media
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*
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* Indexes are used to improve speed and reliability of imported media. Calling Retrieve() will automatically check
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* for an index and create one if it doesn't exist.
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*
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* Indexing is slow so it's recommended to do it in a background thread. Index() must be called while the Decoder is
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* open, and does not automatically call Open() and Close() the Decoder. The caller must call thse manually.
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*
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* FIXME: This should perhaps become a common function for the base Decoder class
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*/
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void Index();
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/**
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* @brief Returns the filename for the index
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*
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* Retrieves the absolute filename of the index file for this stream. Decoder must be open for this to work correctly.
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*
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* @return
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*/
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QString GetIndexFilename();
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/**
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* @brief Used internally to load a frame index into frame_index_ (video only)
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*
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* @return
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*
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* TRUE if a frame index was successfully loaded. FALSE usually means the file didn't exist and Index() should be
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* run to create it.
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*/
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bool LoadFrameIndex();
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/**
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* @brief Used in Index() to save the just created frame index to a file that can be loaded later
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*/
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void SaveFrameIndex();
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int64_t GetClosestTimestampInIndex(const int64_t& ts);
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void Seek(int64_t timestamp);
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/**
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* @brief Returns an AVPixelFormat that can be
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* @param pix_fmt
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* @return
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*/
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AVPixelFormat GetCompatiblePixelFormat(const AVPixelFormat& pix_fmt);
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olive::SampleFormat GetNativeSampleRate(const AVSampleFormat& smp_fmt);
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AVFormatContext* fmt_ctx_;
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AVCodecContext* codec_ctx_;
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AVStream* avstream_;
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AVDictionary* opts_;
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AVFrame* frame_;
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AVPacket* pkt_;
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SwsContext* scale_ctx_;
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int output_fmt_;
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QVector<int64_t> frame_index_;
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};
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#endif // FFMPEGDECODER_H
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