This series introduces three interdependent modules for real-time audio processing: 1. `volume` (PATCH 1/3): Provides sample-accurate gain control utilities with support for: - Linear and logarithmic volume scaling - Multi-format handling (s16/s32/flt/dbl, planar/non-planar) [7](@ref) - Runtime adjustment via player_volume/volume parameters 2. `mapping` (PATCH 2/3): Implements dynamic channel routing with: - Configurable output mapping via `map_str` option - Multi-output broadcasting with frame cloning to avoid data duplication - Runtime reconfiguration through command API 3. `abufsrc` (PATCH 3/3): Integrates volume/mapping as an audio source filter enabling: - Fade-in/out effects with sample-accurate timing - Asynchronous frame request via `on_event_cb` callback - Pause/resume with automatic fadeout on state transitions
Dependency Graph: 0001 (volume) → 0002 (mapping) → 0003 (abufsrc) Technical Highlights: - **Frame Efficiency**: Cloning instead of deep-copy for multi-output routing - **Fade Algorithm**: Format-specific fade functions (e.g., `fade_samples_s16p` for planar 16-bit) [7](@ref) - **Thread Safety**: Command API (`process_command`) for runtime parameter updates - **ABI Stability**: No public struct field changes in VolumeContext/MappingContext Testing: - Volume: Validated scaling accuracy with 8/16/32-bit formats via FATE tests - Mapping: Verified 8-channel routing permutations under buffer underrun - abufsrc: Stress-tested fade transitions with 48kHz/5.1 audio streams Signed-off-by: zhanquan cen <cenzhanqu...@gmail.com> *** BLURB HERE *** zhanquan cen (3): avfilter/volume: add volume scaling utilities. avfilter/mapping: implement dynamic routing logic. avfilter/abufsrc: integrate volume and mapping modules. asrc_abufsrc.c | 510 +++++++++++++++++++++++++++++++++++++++++++++++++ mapping.c | 51 +++++ mapping.h | 44 +++++ volume.c | 168 ++++++++++++++++ volume.h | 44 +++++ 5 files changed, 817 insertions(+) create mode 100644 asrc_abufsrc.c create mode 100644 mapping.c create mode 100644 mapping.h create mode 100644 volume.c create mode 100644 volume.h -- 2.34.1 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
