Julian Smith
5627b135b4
Uses ffmpeg libraries to provide video encoding of an osg::GraphicsContext (which could be for Flightgear's main window) to file. The video codec is specified as a string at runtime. Success depends on what is supported by the system's ffmpeg installation. Handling of resize doesn't always work. We finish current stream and create a new encoder and continue. Works ok with mpeg2, but with more modern codecs vlc usually fails to handle the change. We call the encoder on a separate thread to avoid latency. If SG_FFMPEG is not defined, we don't make calls to ffmpeg libraries and VideoEncoder class's constructor always throws an exception.
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
#pragma once
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#include <memory>
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#include <string>
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#include <osg/GraphicsContext>
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namespace simgear
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{
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/* Compressed video encoder.
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Generated video contains information about frame times, and also copes with
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changes to the width and/or height of the frames.
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So replay will replicate variable frame rates and window resizing. */
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struct VideoEncoder
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{
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/* Constructor; sets things up to write compressed video to file <path>.
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Args:
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path
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Name of output file. Container type is inferred from suffix using
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avformat_alloc_output_context2()). List of supported containers can
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be found with 'ffmpeg -formats'.
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codec_name
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Name of codec, passed to avcodec_find_encoder_by_name(). List of
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supported codecs can be found with 'ffmpeg -codecs'.
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quality
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Encoding quality in range 0..1 or -1 to use codec's default.
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speed:
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Encoding speed in range 0..1 or -1 to use codec's default.
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bitrate
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Target bitratae in bits/sec or -1 to use codex's default.
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Throws exception if we cannot set up encoding, e.g. unrecognised
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codec. Other configuration errors may be detected only when encode() is
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called.
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*/
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VideoEncoder(
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const std::string& path,
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const std::string& codec,
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double quality,
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double speed,
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int bitrate
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);
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/* Appends gc's current bitmap to compressed video. Works by scheduling a
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callback with gc->add(). <dt> must be non-zero.
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Throws exception if error has occurred previously - for example sometimes a
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configuration doesn't fail until we start sending frames. */
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void encode(double dt, osg::GraphicsContext* gc);
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~VideoEncoder();
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private:
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osg::ref_ptr<struct VideoEncoderInternal> m_internal;
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};
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}
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