mikael-lovqvists-claude-agent
a29c556851
Modules (src/modules/): - common/error: App_Error struct with structured detail union, error codes, app_error_print(); designed for future upgrade to preprocessor-generated location codes - media_ctrl: media device enumeration, topology query (entities/pads/links), link enable/disable via Media Controller API (/dev/media*) - v4l2_ctrl: control enumeration (with menu item fetching), get/set via V4L2 ext controls API, device discovery (/dev/video*) All modules use -std=c11 -D_GNU_SOURCE, build artifacts go to build/ only. Kernel-version-dependent constants guarded with #ifdef + #warning. CLI drivers (dev/cli/): - media_ctrl_cli: list, info, topology, set-link subcommands - v4l2_ctrl_cli: list, controls, get, set subcommands Docs (docs/cli/): - media_ctrl_cli.md and v4l2_ctrl_cli.md with usage, examples, and context within the video routing system Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
#pragma once
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#include <stdint.h>
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#include "error.h"
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/* Opaque handle — defined in media_ctrl.c */
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struct Media_Ctrl;
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struct Media_Device_Info {
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char driver[16];
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char model[32];
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char serial[40];
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char bus_info[32];
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uint32_t media_version;
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uint32_t hw_revision;
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uint32_t driver_version;
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};
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struct Media_Entity {
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uint32_t id;
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char name[32];
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uint32_t type; /* MEDIA_ENT_F_* value from kernel */
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uint32_t flags;
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uint16_t pad_count;
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uint16_t link_count;
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uint32_t dev_major; /* associated device node major, 0 if none */
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uint32_t dev_minor;
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};
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struct Media_Pad {
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uint32_t entity_id;
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uint16_t index;
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uint32_t flags; /* MEDIA_PAD_FL_SINK / MEDIA_PAD_FL_SOURCE */
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};
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struct Media_Link {
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struct Media_Pad source;
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struct Media_Pad sink;
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uint32_t flags; /* MEDIA_LNK_FL_ENABLED, MEDIA_LNK_FL_IMMUTABLE */
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};
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/*
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* Enumerate all /dev/media* device nodes present on the system.
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* Calls callback once per device path found.
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*/
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struct App_Error media_ctrl_find_devices(
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void (*callback)(const char *device_path, void *userdata),
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void *userdata);
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struct App_Error media_ctrl_open(const char *device_path, struct Media_Ctrl **out);
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void media_ctrl_close(struct Media_Ctrl *ctrl);
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struct App_Error media_ctrl_get_info(
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struct Media_Ctrl *ctrl,
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struct Media_Device_Info *out);
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/*
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* Enumerate all entities in the media graph.
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*/
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struct App_Error media_ctrl_enum_entities(
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struct Media_Ctrl *ctrl,
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void (*callback)(const struct Media_Entity *entity, void *userdata),
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void *userdata);
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/*
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* Enumerate pads and links for a specific entity.
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* Pass the entity struct obtained from media_ctrl_enum_entities —
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* the pad and link counts are taken from it.
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* Either callback may be NULL if that information is not needed.
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*/
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struct App_Error media_ctrl_enum_entity_pads_and_links(
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struct Media_Ctrl *ctrl,
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const struct Media_Entity *entity,
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void (*pad_callback)(const struct Media_Pad *pad, void *userdata),
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void (*link_callback)(const struct Media_Link *link, void *userdata),
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void *userdata);
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/*
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* Enable or disable a link between two pads.
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* Immutable links cannot be changed and will return an error.
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*/
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struct App_Error media_ctrl_set_link(
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struct Media_Ctrl *ctrl,
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uint32_t source_entity_id, uint16_t source_pad_index,
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uint32_t sink_entity_id, uint16_t sink_pad_index,
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int enabled);
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/* Human-readable names for display */
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const char *media_entity_type_name(uint32_t type);
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const char *media_pad_flag_name(uint32_t flags);
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