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lavc: Add device context field to AVCodecContext

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For use by codec implementations which can allocate frames internally.
This commit is contained in:
Mark Thompson 2017-02-11 15:13:04 +00:00
parent 07b5136c48
commit 44f2eda39f
4 changed files with 29 additions and 2 deletions
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3
doc/APIchanges
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@ -13,6 +13,9 @@ libavutil: 2015-08-28
API changes, most recent first:
2017-xx-xx - xxxxxxx - lavc 57.34.0 - avcodec.h
Add AVCodecContext.hw_device_ctx.
2017-02-11 - xxxxxxx - lavu 55.32.0 - frame.h
Add AVFrame.opaque_ref.

25
libavcodec/avcodec.h
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@ -3093,7 +3093,8 @@ typedef struct AVCodecContext {
/**
* A reference to the AVHWFramesContext describing the input (for encoding)
* or output (decoding) frames. The reference is set by the caller and
* afterwards owned (and freed) by libavcodec.
* afterwards owned (and freed) by libavcodec - it should never be read by
* the caller after being set.
*
* - decoding: This field should be set by the caller from the get_format()
* callback. The previous reference (if any) will always be
@ -3139,6 +3140,28 @@ typedef struct AVCodecContext {
* (with the display dimensions being determined by the crop_* fields).
*/
int apply_cropping;
/**
* A reference to the AVHWDeviceContext describing the device which will
* be used by a hardware encoder/decoder. The reference is set by the
* caller and afterwards owned (and freed) by libavcodec.
*
* This should be used if either the codec device does not require
* hardware frames or any that are used are to be allocated internally by
* libavcodec. If the user wishes to supply any of the frames used as
* encoder input or decoder output then hw_frames_ctx should be used
* instead. When hw_frames_ctx is set in get_format() for a decoder, this
* field will be ignored while decoding the associated stream segment, but
* may again be used on a following one after another get_format() call.
*
* For both encoders and decoders this field should be set before
* avcodec_open2() is called and must not be written to thereafter.
*
* Note that some decoders may require this field to be set initially in
* order to support hw_frames_ctx at all - in that case, all frames
* contexts used must be created on the same device.
*/
AVBufferRef *hw_device_ctx;
} AVCodecContext;
/**

1
libavcodec/utils.c
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@ -794,6 +794,7 @@ av_cold int avcodec_close(AVCodecContext *avctx)
avctx->nb_coded_side_data = 0;
av_buffer_unref(&avctx->hw_frames_ctx);
av_buffer_unref(&avctx->hw_device_ctx);
if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)
av_opt_free(avctx->priv_data);

2
libavcodec/version.h
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@ -28,7 +28,7 @@
#include "libavutil/version.h"
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 33
#define LIBAVCODEC_VERSION_MINOR 34
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \