mikael-lovqvists-claude-agent
4ba2a8118d
The CLI is a separate translation unit that doesn't include <linux/media.h>,
so the kernel flag constants were undefined there. Fix by defining our own
public constants in media_ctrl.h:
- MEDIA_LINK_FL_{ENABLED,IMMUTABLE,DYNAMIC} for link flags
- MEDIA_PAD_FLAG_{SINK,SOURCE} for pad flags (distinct names avoid
redefinition conflict with kernel's MEDIA_PAD_FL_* in media_ctrl.c)
media_ctrl.c now translates kernel flags to our constants on the way out.
Added fallback #defines for kernel constants that were missing them.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
100 lines
2.7 KiB
C
100 lines
2.7 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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/* Link flags for Media_Link.flags */
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#define MEDIA_LINK_FL_ENABLED (1u << 0)
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#define MEDIA_LINK_FL_IMMUTABLE (1u << 1)
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#define MEDIA_LINK_FL_DYNAMIC (1u << 2)
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/* Pad flags for Media_Pad.flags */
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#define MEDIA_PAD_FLAG_SINK (1u << 0)
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#define MEDIA_PAD_FLAG_SOURCE (1u << 1)
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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;
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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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