VAAPI VASurfaceFormatAttribDRMFormatModifiers query

main.c

/* gcc main.c -o vaapi-modif $(pkg-config --cflags --libs libva libva-drm libdrm) */

#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <va/va.h>
#include <va/va_drm.h>
#include <va/va_drmcommon.h>
#include <xf86drm.h>

#define VA_CHECK(x) { if (x != VA_STATUS_SUCCESS) abort(); }

int main(int argc, char *argv[])
{
    int fd = open("/dev/dri/renderD128", O_RDWR);
    VADisplay dpy = vaGetDisplayDRM(fd);
    int major_ver, minor_ver;
    VA_CHECK(vaInitialize(dpy, &major_ver, &minor_ver));

    VAConfigID config;
    VA_CHECK(vaCreateConfig(dpy, VAProfileNone, VAEntrypointVideoProc, NULL, 0, &config));

    unsigned int num_attribs;
    VA_CHECK(vaQuerySurfaceAttributes(dpy, config, NULL, &num_attribs));

    VASurfaceAttrib *attrib_list = calloc(num_attribs, sizeof(VASurfaceAttrib));
    VA_CHECK(vaQuerySurfaceAttributes(dpy, config, attrib_list, &num_attribs));

    for (unsigned int i = 0; i < num_attribs; i++) {
        if (attrib_list[i].type != VASurfaceAttribPixelFormat)
            continue;
        VADRMFormatModifierList drm_list = {0};
        uint32_t fourcc = attrib_list[i].value.value.i;
        VASurfaceFormatAttrib format_attrib;
        format_attrib.type == VASurfaceFormatAttribDRMFormatModifiers;
        format_attrib.value.value.p = &drm_list;
        VA_CHECK(vaGetSurfaceFormatAttributes(dpy, config, fourcc, &format_attrib, 1));
        drm_list.modifiers = malloc(sizeof(uint64_t) * drm_list.num_modifiers);
        VA_CHECK(vaGetSurfaceFormatAttributes(dpy, config, fourcc, &format_attrib, 1));

        printf("Format %.4s:\n", &fourcc);
        for (unsigned int j = 0; j < drm_list.num_modifiers; j++)
            printf("\t%"PRIx64" : %s\n", drm_list.modifiers[j], drmGetFormatModifierName(drm_list.modifiers[j]));
        printf("\n");
    }

    return 0;
}