From: wang-bin <wbse...@gmail.com>
hevc is supported on macOS 10.12+ and iOS11+. sw implementaion is
provided for old devices. vt sw decoder is more energy effecient than
ffmpeg sw decoder. the sum of program and vt service cpu usage is about
50% lower than ffmpeg. decoding speed is faster sometimes(if opengl
compatiblility attribute is disabled)
---
libavcodec/videotoolbox.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/libavcodec/videotoolbox.c b/libavcodec/videotoolbox.c
index e66cd23451..9d2f0afa20 100644
--- a/libavcodec/videotoolbox.c
+++ b/libavcodec/videotoolbox.c
@@ -40,6 +40,9 @@
#ifndef kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
# define kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder
CFSTR("RequireHardwareAcceleratedVideoDecoder")
#endif
+#ifndef kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
+# define kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
CFSTR("EnableHardwareAcceleratedVideoDecoder")
+#endif
#if !HAVE_KCMVIDEOCODECTYPE_HEVC
enum { kCMVideoCodecType_HEVC = 'hvc1' };
@@ -684,7 +687,9 @@ static CFDictionaryRef
videotoolbox_decoder_config_create(CMVideoCodecType codec
&kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(config_info,
-
kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
+ (avctx->hwaccel_flags &
AV_HWACCEL_FLAG_ALLOW_SOFTWARE)
+ ?
kVTVideoDecoderSpecification_EnableHardwareAcceleratedVideoDecoder
+ :
kVTVideoDecoderSpecification_RequireHardwareAcceleratedVideoDecoder,
kCFBooleanTrue);
CFMutableDictionaryRef avc_info;
--
2.15.1
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