refactor(codec): de-Qt oakcodec and wrap it in a pure C ABI; switch common handles to refcounted value structs

- oakcodec: de-Qt all 20 sources (QThread decode loop -> std::thread,
  QObject/signals -> callbacks), pure C ABI in include/codec with
  refcounted neutral handles (OakFrame/OakDecoder/OakEncoder),
  framemanager moved in from render, frame_to_buffer/buffer_to_frame
  moved in from oakcommon oiioutils, codec->task via submit callback
  (M8 will register), all cross-module calls go through the other
  side's C API, -fvisibility=hidden + OAKCODEC_API
- oakcommon: handles become refcounted value structs
  {ctx, addref, release, abi_version} (FFmpeg-style), pass-by-value
  signatures, free() as release wrapper; init_from_native/get_native
  for copyable value objects; OakCommonXxx renamed to OakXxx
- oakcommon: add logging (log_debug/info/warning/critical with level
  filtering and sink injection) + printf-style oakcommon_log C wrapper
- oakrender: add CancelAtom C API family; complete
  oakrender_color_processor_convert_frame; fix get_processor() missing
  definition and OCIO env var lookup
- tests: oakcommon 174, oaknode 96, oakrender 42, oakcodec 18, all
  green in their standalone builds

src/node/c_api/colormanager.cpp

@@ -28,13 +28,6 @@
 #include "colortransform.h"
 #include "project.h"
 
-// Same handle-echo pattern as sequence.cpp: oakcommon defines
-// `struct OakCommonColorTransform { olive::ColorTransform impl; }`
-// (src/common/c_api/colortransform.cpp) without exporting the definition.
-struct OakCommonColorTransform {
-	olive::ColorTransform impl;
-};
-
 struct OakNodeColorManager {
 	olive::ColorManager impl;
 };
@@ -349,21 +342,30 @@ int oaknode_colormanager_get_default_luma_coefs(OakNodeColorManager *manager,
 }
 
 int oaknode_colormanager_get_compliant_color_transform(
-	OakNodeColorManager *manager, const OakCommonColorTransform *transform,
-	int force_display, OakCommonColorTransform **out)
+	OakNodeColorManager *manager, OakColorTransform transform,
+	int force_display, OakColorTransform *out)
 {
-	if (!manager || !transform || !out) {
+	if (!manager || !out) {
+		return OAKNODE_E_INVALID;
+	}
+	const olive::ColorTransform *native =
+		oakcommon_colortransform_get_native(transform);
+	if (!native) {
 		return OAKNODE_E_INVALID;
 	}
 	if (!has_config(&manager->impl)) {
 		return OAKNODE_E_STATE;
 	}
 	try {
-		*out = new OakCommonColorTransform{
-			manager->impl.get_compliant_color_space(transform->impl,
-													force_display != 0)};
+		const olive::ColorTransform compliant =
+			manager->impl.get_compliant_color_space(*native,
+													force_display != 0);
+		*out = oakcommon_colortransform_init_from_native(&compliant);
 	} catch (...) {
 		return OAKNODE_E_NOMEM;
 	}
+	if (!out->ctx) {
+		return OAKNODE_E_NOMEM;
+	}
 	return OAKNODE_OK;
 }

src/node/c_api/sequence.cpp

@@ -28,15 +28,6 @@
 #include "project/sequence/sequence.h"
 #include "videoparams.h"
 
-// oakcommon defines its handle as `struct OakCommonVideoParams {
-// olive::VideoParams impl; }` (src/common/c_api/videoparams.cpp) without
-// exporting the definition. Echoing the identical layout here is the only
-// way to hand native VideoParams values across without a field-by-field
-// copy; keep in sync with oakcommon (flagged in the family-C report).
-struct OakCommonVideoParams {
-	olive::VideoParams impl;
-};
-
 namespace
 {
 
@@ -244,7 +235,7 @@ int oaknode_sequence_get_audio_stream_count(OakNodeSequence *sequence,
 }
 
 int oaknode_sequence_get_video_params(OakNodeSequence *sequence, int index,
-									  OakCommonVideoParams **out)
+									  OakVideoParams *out)
 {
 	if (!sequence || !out || index < 0) {
 		return OAKNODE_E_INVALID;
@@ -253,24 +244,34 @@ int oaknode_sequence_get_video_params(OakNodeSequence *sequence, int index,
 		return OAKNODE_E_NOT_FOUND;
 	}
 	try {
-		*out = new OakCommonVideoParams{impl(sequence)->get_video_params(index)};
+		const olive::VideoParams params =
+			impl(sequence)->get_video_params(index);
+		*out = oakcommon_videoparams_init_from_native(&params);
 	} catch (...) {
 		return OAKNODE_E_NOMEM;
 	}
+	if (!out->ctx) {
+		return OAKNODE_E_NOMEM;
+	}
 	return OAKNODE_OK;
 }
 
 int oaknode_sequence_set_video_params(OakNodeSequence *sequence, int index,
-									  const OakCommonVideoParams *params)
+									  OakVideoParams params)
 {
-	if (!sequence || !params || index < 0) {
+	if (!sequence || index < 0) {
+		return OAKNODE_E_INVALID;
+	}
+	const olive::VideoParams *native =
+		oakcommon_videoparams_get_native(params);
+	if (!native) {
 		return OAKNODE_E_INVALID;
 	}
 	if (index >= impl(sequence)->get_video_stream_count()) {
 		return OAKNODE_E_NOT_FOUND;
 	}
 	try {
-		impl(sequence)->set_video_params(params->impl, index);
+		impl(sequence)->set_video_params(*native, index);
 	} catch (...) {
 		return OAKNODE_E_FAILED;
 	}