Ubuntu (FFmpeg 7.0) build failure: the public FB_PIX_FMT_* values were
hardcoded to AVPixelFormat enum values, but those shift between FFmpeg
releases (new formats are inserted mid-enum: X2RGB10 in 7.0,
RGBF16/GRAYF16 later), so the static_asserts in internal.h failed and
RGBF16LE/GRAYF16LE did not exist at all.
The FB pixel format values are now fixed identifiers translated inside
the library by pixel format name (stable across releases):
- fb::PixFmtToAV/PixFmtFromAV resolve the static table by name;
formats a decoder produces that have no static identifier (hardware
downloads like nv12/p010le/p210le) receive process-local dynamic ids
>= 1000 so they keep round-tripping through the API (scaler etc.)
instead of collapsing to NONE and crashing sws.
- All crossing points translated: scaler, frame get/set format,
decoder/probe stream info, encoder config and write_video_frame,
fb_pix_fmt_* utilities, fb_find_best_pix_fmt_of_list (which also
reinterpret_cast the caller's list; now translated element-wise and
properly NONE-terminated).
- nv12 and p010le get static identifiers as the common hardware
download formats.
- Hardware frame detection no longer compares pixel formats (breaks
across format spaces); it uses the existing fb_frame_is_hw().
macOS test failures (FFmpegBridgeEncoder.WritePngVideoAndProbeBack,
WritePcmAudioAndProbeBack): config.filename held a dangling pointer to
a temporary QByteArray (UB; happened to work on Linux). Keep the
QByteArray alive for the encoder's lifetime.
Windows (MSYS2 UCRT64) build failure: timecodefunctions.h used int64_t
without including <cstdint> (previously pulled in transitively).
Full gtest suite: 584 passed.
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