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avcodec/videotoolbox: allow not setting the kCVPixelBufferPixelFormatTypeKey 

If AVVideotoolboxContext.cv_pix_fmt_type is set to 0, don't set the
kCVPixelBufferPixelFormatTypeKey value on the VT decoder.

This makes VT output its native format, which can be much faster on
some hardware iterations (if the native format does not match with
the requested format, it will be converted, which is slow).

The default is still forcing nv12.
This commit is contained in:
wm4 2017-02-24 10:17:34 +01:00
parent 227f6e1e8d
commit ade7c1a232
4 changed files with 9 additions and 3 deletions
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4
doc/APIchanges
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@ -15,6 +15,10 @@ libavutil: 2015-08-28
API changes, most recent first:
2017-03-02 - xxxxxxx - lavc 57.81.104 - videotoolbox.h
AVVideotoolboxContext.cv_pix_fmt_type can now be set to 0 to output the
native decoder format. (The default value is not changed.)
2017-03-02 - xxxxxxx - lavu 55.47.101, lavc 57.81.102, lavf 57.66.103
Remove requirement to use AVOption or accessors to access certain fields
in AVFrame, AVCodecContext, and AVFormatContext that were previously

2
libavcodec/version.h
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@ -29,7 +29,7 @@
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 81
#define LIBAVCODEC_VERSION_MICRO 102
#define LIBAVCODEC_VERSION_MICRO 103
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \

1
libavcodec/videotoolbox.c
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@ -472,6 +472,7 @@ static CFDictionaryRef videotoolbox_buffer_attributes_create(int width,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (pix_fmt)
CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt);
CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties);
CFDictionarySetValue(buffer_attributes, kCVPixelBufferWidthKey, w);

3
libavcodec/videotoolbox.h
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@ -58,7 +58,8 @@ typedef struct AVVideotoolboxContext {
/**
* CVPixelBuffer Format Type that Videotoolbox will use for decoded frames.
* set by the caller.
* set by the caller. If this is set to 0, then no specific format is
* requested from the decoder, and its native format is output.
*/
OSType cv_pix_fmt_type;