Replace every direct FFmpeg call in the editor and the render worker
with the pure C ffmpeg_bridge API, wrapped in thin C++ adapters that
preserve the original interfaces:
- avframeptr.h: olive::AVFrame adapter around FBFrame handles
- ffmpegutils: format conversion helpers on FB_* constants; the int
overload is renamed GetCompatibleBridgePixelFormat to avoid a silent
overload-resolution trap with the PixelFormat enum
- ffmpegdecoder/ffmpegencoder: rewritten as handle-based adapters over
FBDecoder/FBProbe/FBEncoder/FBScaler/FBResampler
- audioprocessor: FBAudioGraph push/pull adapter
- pluginrenderer/OliveClip: sws/pixdesc usage converted to FBScaler and
fb_pix_fmt_* queries
- AudioParams/channel layouts are plain uint64_t masks everywhere
Build integration: the root project no longer links FFMPEG directly;
only ffmpeg_bridge does. Binaries resolve the bridge library at runtime
via @loader_path inside the macOS app bundle (copied there post-build)
and via $ORIGIN/../ffmpeg_bridge/bin on Linux; on Windows the DLL is
installed next to the executables, so packages on all three platforms
ship the bridge library.
ffmpeg_bridge gains the extra API the adapters need:
fb_frame_make_writable, fb_decoder_get_format_duration,
fb_resampler_convert_frame, FB_PIX_FMT_YUV440P, SRT validation in
fb_probe_read_subtitle_stream, packed/planar fixes in
fb_encoder_write_audio, and a component-size fix in
fb_pix_fmt_component_size.
The library lives outside of app/ and is the only component that includes
FFmpeg headers or links FFmpeg libraries. All objects (frames, packets,
decoder/encoder instances, scalers, resamplers, audio filter graphs) are
identified by opaque handles and never leave the library.
Public surface (include/ffmpeg_bridge/ffmpeg_bridge.h):
- FBFrame/FBPacket: AVFrame/AVPacket wrappers with field accessors
- FBDecoder: demux+decode instance with hwaccel fallback logic
- FBProbe: file probing, per-stream details, subtitle reading
- FBScaler/FBResampler/FBAudioGraph: swscale/swresample/avfilter wrappers
- FBEncoder: full export encoder (video filter graph, audio resampling,
subtitles) ported from FFmpegEncoder
- FB_* constants mirror AV_* values, verified by static_asserts against
the real FFmpeg headers inside the library
Two small bugs in the ported encoder were fixed: the resampler is now
properly freed with swr_free() (was re-initialized with swr_init() and
leaked), and codec option dictionaries are freed after avcodec_open2().
Mike-Solar