Apple VideToolbox list supported hardware accelerated video encoders

hardware_accel_vidtoolbox.c

#include <CoreFoundation/CoreFoundation.h>
#include <CoreMedia/CoreMedia.h>
#include <CoreVideo/CoreVideo.h>
#include <VideoToolbox/VideoToolbox.h>
#include <stdbool.h>
#include <stdio.h>

void printAvailableVideoEncoders();

int main(void) {
  bool vp9hardware = VTIsHardwareDecodeSupported(kCMVideoCodecType_VP9);
  printf("Is VP9 hardware decode: %d\n", vp9hardware);
  printAvailableVideoEncoders();
  return 0;
}

void printAvailableVideoEncoders() {
  CFArrayRef encoderList = NULL;
  CFDictionaryRef encoderDict = NULL;
  CFStringRef encoderName = NULL;
  CFBooleanRef isHardware = NULL;

  OSStatus status = VTCopyVideoEncoderList(NULL, &encoderList);
  if (status != 0) {
    printf("Failed to fetch encoder list\n");
    return;
  }

  CFIndex encoderCount = CFArrayGetCount(encoderList);
  for (CFIndex i = 0; i < encoderCount; i++) {
    encoderDict = CFArrayGetValueAtIndex(encoderList, i);
    if (encoderDict) {
      encoderName =
          CFDictionaryGetValue(encoderDict, kVTVideoEncoderList_EncoderName);
      isHardware = CFDictionaryGetValue(
          encoderDict, kVTVideoEncoderList_IsHardwareAccelerated);

      if (encoderName) {
        printf("Encoder: %s\n",
               CFStringGetCStringPtr(encoderName, kCFStringEncodingUTF8));
      }

      if (isHardware) {
        if (CFBooleanGetValue(isHardware)) {
          printf("Hardware Accelerated: Yes\n");
        } else {
          printf("Hardware Accelerated: No\n");
        }
      } else {
        printf("Hardware Accelerated: No\n");
      }
    }
  }
  if (encoderList) {
    CFRelease(encoderList);
  }
}