Docs file normalization.
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# Audio engine requirements
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# Audio Engine Requirements
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## Real-time callback rules
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## Real-Time Callback Rules
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The callback must not allocate/free memory, lock blocking mutexes, perform
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filesystem/network/console I/O, log, load plugins or samples, call GUI APIs,
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or wait for another thread.
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filesystem/network/console I/O, log, load plugins or samples, call GUI APIs, or
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wait for another thread.
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Use preallocated buffers and bounded work. Publish parameter and graph changes
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through a documented real-time-safe mechanism. Verify atomics are lock-free
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where required on the target platform.
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## Processing model
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---
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## Processing Model
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Process a bounded number of frames per block. Do not assume a fixed block size
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unless the backend guarantees it. Define maximum frame and event counts and
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safe behavior when those limits are reached.
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unless the backend guarantees it. Define maximum frame and event counts and safe
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behavior when those limits are reached.
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The initial milestone is offline processing, then a test oscillator -> gain ->
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meter/output graph, then a hardware backend.
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## Clock and transport
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---
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## Clock and Transport
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Audio sample position is the authoritative playback clock. Use integer or
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rational timeline representations to avoid cumulative floating-point drift.
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Define tempo-map conversion and behavior at tempo changes before implementing
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tempo automation.
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---
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## Offline API
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`xtc_graph_create` accepts 1..256 nodes; IDs are monotonic stable identifiers, never reused
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within a graph's lifetime. Enumeration indexes are dense and distinct from IDs. Supported nodes are gain (any finite multiplier), sine
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`xtc_graph_create` accepts 1..256 nodes; IDs are monotonic stable identifiers,
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never reused within a graph's lifetime. Enumeration indexes are dense and
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distinct from IDs. Supported nodes are gain (any finite multiplier), sine
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oscillator (finite nonnegative Hz), pass-through peak meter and audio output.
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Ports carry mono float audio: input 0, output 1. Oscillators have no input and
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output nodes have no output. Port lookup reports direction, signal type and
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channel count. MIDI/control ports and channel conversion are not implemented;
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invalid ports/directions, duplicate edges and cycles are rejected before an
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edit becomes visible. Fan-out copies a source to consumers; fan-in sums inputs
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invalid ports/directions, duplicate edges and cycles are rejected before an edit
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becomes visible. Fan-out copies a source to consumers; fan-in sums inputs
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without normalization. Failed additions leave IDs and graph contents unchanged.
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`xtc_graph_compile(graph, sample_rate, max_frames, &plan)` runs on the control
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thread. Empty graphs compile to silence. Sample rate must be finite and positive,
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oscillators must be at or below Nyquist, and max_frames is 1..65536. Compilation
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allocates and copies topology/parameters, builds a topological schedule and
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input adjacency, and allocates paired max_frames float buffers per node for stereo. The
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maximum buffer storage is 128 MiB per plan (32 MiB for the GUI 64-node limit). Compilation may fail with an
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allocation error; output plan is then NULL. Destroy a plan on the control thread.
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thread. Empty graphs compile to silence. Sample rate must be finite and
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positive, oscillators must be at or below Nyquist, and max_frames is 1..65536.
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Compilation allocates and copies topology/parameters, builds a topological
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schedule and input adjacency, and allocates paired max_frames float buffers per
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node for stereo. The maximum buffer storage is 128 MiB per plan (32 MiB for the
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GUI 64-node limit). Compilation may fail with an allocation error; output plan
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is then NULL. Destroy a plan on the control thread.
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`xtc_plan_process` uses only prepared state: no allocation/free, sorting,
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logging, I/O or locks. Each call accepts up to max_frames; oversized calls
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return capacity errors without modifying output or state. Output storage must
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hold frame_count floats. NULL input means silence; input/output may alias.
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Zero frames leaves all state unchanged. No plan operations may run concurrently
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with processing, including reset, meter reads or destruction.
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hold frame_count floats. NULL input means silence; input/output may alias. Zero
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frames leaves all state unchanged. No plan operations may run concurrently with
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processing, including reset, meter reads or destruction.
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Unconnected non-oscillator nodes receive external input. Connected inputs
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receive only the sum of their upstream buffers. Explicit output nodes are
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summed to the caller's output. If none exist, terminal nodes are summed for
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receive only the sum of their upstream buffers. Explicit output nodes are summed
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to the caller's output. If none exist, terminal nodes are summed for
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compatibility with the original gain-chain API, unless
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`xtc_graph_require_output_nodes(graph, 1)` is set. The GUI uses that policy;
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no output nodes means silence. Disconnected components cannot
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contribute when explicit outputs exist, but they are still processed. Floating
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point overflow and nonfinite input become silence per sample. No clipping or
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normalization is applied to finite samples.
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`xtc_graph_require_output_nodes(graph, 1)` is set. The GUI uses that policy; no
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output nodes means silence. Disconnected components cannot contribute when
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explicit outputs exist, but they are still processed. Floating point overflow
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and nonfinite input become silence per sample. No clipping or normalization is
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applied to finite samples.
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Oscillators start at phase zero and carry phase continuously across blocks;
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reset clears phases and meter peaks. Meter reads return the last nonempty
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block's absolute peak. These are same-thread reads, not a thread-safe GUI
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meter bridge. Rendering is deterministic on the same build/platform regardless
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of block partitioning; libm results need not be bit-identical across platforms.
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block's absolute peak. These are same-thread reads, not a thread-safe GUI meter
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bridge. Rendering is deterministic on the same build/platform regardless of
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block partitioning; libm results need not be bit-identical across platforms.
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`xtc_graph_process_offline` remains a convenience helper, compiling at 48000 Hz
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and destroying the plan after one block. It accepts a finite external-input
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gain and requires non-NULL input/output. It now follows routing rather than
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and destroying the plan after one block. It accepts a finite external-input gain
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and requires non-NULL input/output. It now follows routing rather than
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multiplying every gain in insertion order. It allocates and is not suitable for
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an audio callback. Use a persistent plan for phase continuity and repeated blocks.
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an audio callback. Use a persistent plan for phase continuity and repeated
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blocks.
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Tests in `tests/unit/test_offline.c` cover known oscillator samples, gain and
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meter output, reset and partition equivalence, fan-out/fan-in, reverse insertion
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order, disconnected nodes, in-place processing, nonfinite input, invalid ports,
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cycles, capacity limits, plan lifetime and repeated compilation/cleanup.
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The offline API remains single-owner. The realtime/backend APIs below add
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cycles, capacity limits, plan lifetime and repeated compilation/cleanup. The
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offline API remains single-owner. The realtime/backend APIs below add
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publication and JACK processing; offline tests alone do not qualify hardware.
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## Backend and realtime bridge
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---
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## Backend and Realtime Bridge
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Use `xtc_backend.h` on one serialized control thread:
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1. Open a config with `XTC_BACKEND_JACK`, a client name, channel_count 1 (or 2 for stereo output), and
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max_frames 1..65536. It must accommodate the server's current buffer size.
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The actual rate and buffer size are returned through get_status. Open does
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not start the server or acquire devices directly. Invalid config returns
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invalid argument, missing build support returns unsupported, and JACK setup
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failures return I/O error. If cleanup itself fails, a non-NULL output handle
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is preserved for close retry; no other operation is allowed on that handle.
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2. Submit a graph (copied/compiled at the server rate), then start. Starting
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an already running client is an invalid-state error; stopping a stopped
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client succeeds. With no submitted graph, callbacks produce silence.
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1. Open a config with `XTC_BACKEND_JACK`, a client name, channel_count 1 (or 2
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for stereo output), and max_frames 1..65536. It must accommodate the server's
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current buffer size. The actual rate and buffer size are returned through
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get_status. Open does not start the server or acquire devices directly.
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Invalid config returns invalid argument, missing build support returns
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unsupported, and JACK setup failures return I/O error. If cleanup itself
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fails, a non-NULL output handle is preserved for close retry; no other
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operation is allowed on that handle.
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2. Submit a graph (copied/compiled at the server rate), then start. Starting an
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already running client is an invalid-state error; stopping a stopped client
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succeeds. With no submitted graph, callbacks produce silence.
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3. Enumerate available audio ports with visit_ports. Names are borrowed only
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during the visitor; do not reenter backend operations from the visitor.
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Connect the client's input to a remote output or its output to a remote
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input explicitly. JACK maps device selection to server/device port routes;
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ALSA device identifiers are not accepted here. The server controls rate,
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period and hardware configuration outside this API. Names/ports can disappear
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between enumeration and connection; route failures are returned as I/O errors.
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Connect the client's input to a remote output or its output to a remote input
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explicitly. JACK maps device selection to server/device port routes; ALSA
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device identifiers are not accepted here. The server controls rate, period
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and hardware configuration outside this API. Names/ports can disappear
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between enumeration and connection; route failures are returned as I/O
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errors.
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4. During playback, submit edited graphs and periodically collect retired
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resources. Capacity means one pending graph is still awaiting adoption;
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keep the current graph and retry later. Stopped submissions instead compile
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a replacement engine off-thread and swap only after success, while callbacks
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are quiescent. Its block/revision counters restart and oscillator phase resets;
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no edit is blocked behind a plan that cannot be adopted until playback. get_status is a nonblocking snapshot
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of rate, frames, running/server-loss/rate-change flags, xruns, processed
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blocks and last process result. No active DSP memory is exposed.
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resources. Capacity means one pending graph is still awaiting adoption; keep
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the current graph and retry later. Stopped submissions instead compile a
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replacement engine off-thread and swap only after success, while callbacks
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are quiescent. Its block/revision counters restart and oscillator phase
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resets; no edit is blocked behind a plan that cannot be adopted until
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playback. get_status is a nonblocking snapshot of rate, frames,
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running/server-loss/rate-change flags, xruns, processed blocks and last
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process result. No active DSP memory is exposed.
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5. Stop pauses the retained DSP state after deactivation. Restart resumes it.
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Close removes the JACK client, synchronizes all callbacks, then destroys
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plans. Stop/close failures preserve the handle for recovery/retry. No plan
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is freed on the audio thread. Sample-rate change or server loss requires
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plans. Stop/close failures preserve the handle for recovery/retry. No plan is
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freed on the audio thread. Sample-rate change or server loss requires
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close/reopen and a fresh submission; there is no automatic reconnect.
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Buffers can change size. In-limit changes process normally; oversized blocks
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are silent and report capacity errors until the size is supported again.
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Rate changes latch silence and invalid-state processing results. A missing input
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Buffers can change size. In-limit changes process normally; oversized blocks are
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silent and report capacity errors until the size is supported again. Rate
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changes latch silence and invalid-state processing results. A missing input
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buffer is treated as unavailable input (silence). A missing output buffer is
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reported as an I/O process error. Shutdown callbacks only set the loss flag;
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the control thread closes the client. No JACK or GUI types cross the C API.
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reported as an I/O process error. Shutdown callbacks only set the loss flag; the
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control thread closes the client. No JACK or GUI types cross the C API.
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The standalone `xtc_realtime.h` API allows hardware-independent consumers and
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stress tests. Submit compiles on the producer; process adopts at a block
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@ -134,12 +148,15 @@ JACK notification callbacks were audited for prohibited operations; JACK's own
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internal realtime guarantees depend on the installed implementation/server.
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Validation commands and results are recorded in BUILD.md and the integration
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test README. Current limitations: mono input, no crossfaded graph changes, no automatic reconnect,
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no physical-device or long-duration endurance qualification. The FLTK shell is
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connected to backend controls and status; see GUI.md. Its editors remain
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placeholders except the modular editor described below.
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test README. Current limitations: mono input, no crossfaded graph changes, no
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automatic reconnect, no physical-device or long-duration endurance
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qualification. The FLTK shell is connected to backend controls and status; see
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GUI.md. Its editors remain placeholders except the modular editor described
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below.
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## Graph snapshots and edits
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---
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## Graph Snapshots and Edits
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The control-thread API exposes copies through get_counts, get_node(index) and
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get_connection(index), including node IDs/types/values and port endpoints. No
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@ -154,17 +171,17 @@ and returns a caller-owned candidate on success. On failure candidate is NULL,
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source and added_id are unchanged. added_id is optional and written only for
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ADD_NODE. ADD_NODE validates type and the used parameter (finite gain, or finite
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nonnegative oscillator Hz). Meter/output do not use the value field. Compile
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additionally checks the oscillator against the actual sample rate. Removing
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a node removes its incident connections; disconnecting a nonexistent edge
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returns not-found. Missing nodes/ports, reversed directions, duplicate edges,
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cycles and unknown command/type values are rejected without visible edits.
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additionally checks the oscillator against the actual sample rate. Removing a
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node removes its incident connections; disconnecting a nonexistent edge returns
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not-found. Missing nodes/ports, reversed directions, duplicate edges, cycles and
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unknown command/type values are rejected without visible edits.
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The GUI keeps a 64-node graph requiring explicit output nodes. It creates a
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candidate, submits that exact candidate to the backend, then swaps its owned
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graph and refreshes the canvas only if submission succeeds. Failed compile or
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pending-slot pressure destroys the candidate and retains both the displayed
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graph and previously submitted engine plan. When disconnected at startup,
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edits can be stored locally and are submitted on reconnect. Lost/changed active
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graph and previously submitted engine plan. When disconnected at startup, edits
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can be stored locally and are submitted on reconnect. Lost/changed active
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backends reject edits until reconnect. Reconnect submits the retained graph.
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Submitted/active revision counters expose adoption without exposing plan
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@ -181,20 +198,21 @@ silent under the GUI policy. Terminal fallback remains the default for earlier
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offline/standalone callers. Input on unconnected nodes retains the existing
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external-input contract; the GUI does not connect external JACK ports.
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---
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## Transport
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Backend status includes a uint64 sample_position. Each successful processing
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callback advances it by its exact frame count (including silence); errors do
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not advance it. The counter uses compiler atomics, verified always lock-free
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before backend setup, with overflow detected rather than wrapped. No extra
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allocation, I/O, mutex or GUI work occurs in callbacks. Fields remain individually
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coherent snapshots.
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callback advances it by its exact frame count (including silence); errors do not
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advance it. The counter uses compiler atomics, verified always lock-free before
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backend setup, with overflow detected rather than wrapped. No extra allocation,
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I/O, mutex or GUI work occurs in callbacks. Fields remain individually coherent
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snapshots.
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Stop pauses the clock. Start resumes; stopped and running graph submissions
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preserve position even when plan/revision counters reset. Reopen starts at zero.
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xtc_backend_seek changes position only on a healthy stopped backend; it does
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not rewind oscillator phase. Project tick/sample conversions use integer floor
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xtc_backend_seek changes position only on a healthy stopped backend; it does not
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rewind oscillator phase. Project tick/sample conversions use integer floor
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arithmetic at constant tempo, with explicit capacity errors and rates 1..768000.
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The GUI observes the counter every 100 ms, so visual updates are block-quantized
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and delayed by polling. No external JACK transport synchronization is provided.
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@ -203,8 +221,9 @@ Silent clip metadata is control-thread data, never traversed by the callback.
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Audio/MIDI scheduling uses compiled event/clip plans rather than direct callback
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access to the editable project.
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---
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## Audio source and recording
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## Audio Source and Recording
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xtc_audio.h provides control-thread import and immutable preloaded clip plans.
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The backend prepares a project only while stopped: build audio candidate,
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@ -214,31 +233,33 @@ assets produce explicit issue metadata and silence; OOM/capacity fails.
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Graph-only edits still use the existing pending/retired mechanism while running.
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Each callback renders the plan into a preallocated mono timeline buffer using
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the authoritative sample position. xtc_realtime_process_audio passes that
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buffer into the compiled graph; XTC_NODE_AUDIO (output port only) reads it,
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the authoritative sample position. xtc_realtime_process_audio passes that buffer
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into the compiled graph; XTC_NODE_AUDIO (output port only) reads it,
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independently from external JACK input. The old process APIs remain wrappers
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with a silent timeline. Import creates a source/output route if necessary.
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No samples or GUI/project arrays are shared with editable state. Clip mixing,
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rate conversion and graph processing are bounded; see AUDIO_FILES.md for limits.
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with a silent timeline. Import creates a source/output route if necessary. No
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samples or GUI/project arrays are shared with editable state. Clip mixing, rate
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conversion and graph processing are bounded; see AUDIO_FILES.md for limits.
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A borrowed recorder can be attached/detached only while stopped. Raw JACK input
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is copied to its SPSC ring before graph processing. Producer and consumer index
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release/acquire operations protect payload ownership; all atomics are checked
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always lock-free. The control thread drains to a temporary float32 WAV, then
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finalizes only after successful stop/close has synchronized the callback.
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An overflowing ring or unavailable input creates a sticky error; later input is
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dropped, reported and never silently joined into a continuous-looking take.
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A partial overflow take is finalized for manual recovery. File errors retain
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the previous destination and remove unfinished temporaries.
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finalizes only after successful stop/close has synchronized the callback. An
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overflowing ring or unavailable input creates a sticky error; later input is
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dropped, reported and never silently joined into a continuous-looking take. A
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partial overflow take is finalized for manual recovery. File errors retain the
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previous destination and remove unfinished temporaries.
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GUI recording uses a two-second ring and 100 ms control-thread draining, with
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no worker thread. A GUI stall can overflow it. No callback allocation/free, file
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GUI recording uses a two-second ring and 100 ms control-thread draining, with no
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worker thread. A GUI stall can overflow it. No callback allocation/free, file
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I/O, logging, locks or FLTK calls were added. Backend stop failure preserves the
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borrowed recorder; the caller must not free it before successful quiescence.
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Live software source/capture acceptance and concurrent ring tests pass; physical
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recording, latency compensation and disk endurance remain unverified.
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## MIDI source
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---
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## MIDI Source
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The C MIDI plan prepares bounded source-relative notes into sample spans and
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renders a separate instrument buffer. `xtc_plan_process_sources` and
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@ -247,10 +268,12 @@ instrument input; older wrappers supply silence for omitted sources. Graph
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instrument nodes consume the shared mono instrument buffer. The backend owns
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prepared MIDI runtime state exclusively while active, with lock-free panic
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requests and no callback allocation/I/O. Stop/seek clear live voices; scheduled
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notes chase their absolute phase. See MIDI.md for event ordering, panic semantics,
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capacities and test coverage. No new dependency is required.
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notes chase their absolute phase. See MIDI.md for event ordering, panic
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semantics, capacities and test coverage. No new dependency is required.
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## Stereo mixing and automation
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---
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## Stereo Mixing and Automation
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Track settings and automation are copied into immutable source-plan snapshots.
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`xtc_audio_plan_render_stereo` and `xtc_midi_plan_render_stereo` pan track audio
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@ -260,11 +283,13 @@ retain gain/mute/solo/automation but ignore pan. `xtc_plan_process_stereo` and
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with one oscillator phase advance, preserving mono APIs and graph publication.
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The backend preallocates paired buffers, registers an optional output_right port
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and publishes independently atomic output peak snapshots. Callback work remains
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bounded and allocation/I/O/lock free. Meter UI reads no active plan memory.
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See MIXER.md for exact pan law, automation interpolation, event/source exceptions,
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bounded and allocation/I/O/lock free. Meter UI reads no active plan memory. See
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MIXER.md for exact pan law, automation interpolation, event/source exceptions,
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memory/history bounds and verification. Input/recording remain mono.
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## Native processing
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---
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## Native Processing
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Graph-native effects/sources use copied versioned descriptors, two independently
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prepared mono instances and the existing plan ownership/retirement protocol.
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@ -274,19 +299,24 @@ without rolling back already advanced DSP. Native event instruments can render
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explicitly into graph instrument buffers. See NATIVE_API.md for exact lifecycle
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and serialization limits and PERFORMANCE.md for measured workload and budgets.
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## Ownership audit
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---
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|
||||
## Ownership Audit
|
||||
|
||||
[RELIABILITY.md](RELIABILITY.md) records resource owners, publication and
|
||||
reclamation ordering, callback work bounds and repeatable diagnostic tests.
|
||||
Graph stereo rendering completes both channels before writing caller outputs;
|
||||
either output may equal a source, but the output buffers must not overlap.
|
||||
|
||||
## Quality policy
|
||||
---
|
||||
|
||||
[AUDIO_QUALITY.md](AUDIO_QUALITY.md) defines absolute musical timing, tempo snapshot
|
||||
changes, scheduled source envelopes and configurable master transitions. The GUI
|
||||
enables 5 ms fades; low-level defaults remain raw. `xtc_backend_request_stop` is
|
||||
asynchronous and does not establish quiescence; control-thread collection after
|
||||
its callback acknowledgement deactivates JACK. Immediate stop/close remain
|
||||
available. Sample rate and buffer frames are reported, but end-to-end latency
|
||||
and native-node delay compensation are not implemented.
|
||||
## Quality Policy
|
||||
|
||||
[AUDIO_QUALITY.md](AUDIO_QUALITY.md) defines absolute musical timing, tempo
|
||||
snapshot changes, scheduled source envelopes and configurable master
|
||||
transitions. The GUI enables 5 ms fades; low-level defaults remain raw.
|
||||
`xtc_backend_request_stop` is asynchronous and does not establish quiescence;
|
||||
control-thread collection after its callback acknowledgement deactivates JACK.
|
||||
Immediate stop/close remain available. Sample rate and buffer frames are
|
||||
reported, but end-to-end latency and native-node delay compensation are not
|
||||
implemented.
|
||||
|
|
|
|||
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