From b1f01e85a92d401a9b29c79f23db36b7685e8c09 Mon Sep 17 00:00:00 2001 From: Mark Thompson Date: Thu, 18 Feb 2016 23:25:52 +0000 Subject: [PATCH] lavu: add a way to query hwcontext frame constraints Signed-off-by: Anton Khirnov --- doc/APIchanges | 3 ++ libavutil/hwcontext.c | 45 ++++++++++++++++++++++ libavutil/hwcontext.h | 69 ++++++++++++++++++++++++++++++++++ libavutil/hwcontext_internal.h | 10 +++++ libavutil/version.h | 2 +- 5 files changed, 128 insertions(+), 1 deletion(-) diff --git a/doc/APIchanges b/doc/APIchanges index 20fecb995d..759816bd70 100644 --- a/doc/APIchanges +++ b/doc/APIchanges @@ -13,6 +13,9 @@ libavutil: 2015-08-28 API changes, most recent first: +2016-xx-xx - xxxxxxx - lavu 55.7.0 - hwcontext.h + Add AVHWFramesConstraints and associated API. + 2016-02-23 - 9200514 - lavf 57.5.0 - avformat.h Add AVStream.codecpar, deprecate AVStream.codec. diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c index b6d05181c4..53e11b8eae 100644 --- a/libavutil/hwcontext.c +++ b/libavutil/hwcontext.c @@ -400,3 +400,48 @@ int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags) return 0; } + +void *av_hwdevice_hwconfig_alloc(AVBufferRef *ref) +{ + AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data; + const HWContextType *hw_type = ctx->internal->hw_type; + + if (hw_type->device_hwconfig_size == 0) + return NULL; + + return av_mallocz(hw_type->device_hwconfig_size); +} + +AVHWFramesConstraints *av_hwdevice_get_hwframe_constraints(AVBufferRef *ref, + const void *hwconfig) +{ + AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data; + const HWContextType *hw_type = ctx->internal->hw_type; + AVHWFramesConstraints *constraints; + + if (!hw_type->frames_get_constraints) + return NULL; + + constraints = av_mallocz(sizeof(*constraints)); + if (!constraints) + return NULL; + + constraints->min_width = constraints->min_height = 0; + constraints->max_width = constraints->max_height = INT_MAX; + + if (hw_type->frames_get_constraints(ctx, hwconfig, constraints) >= 0) { + return constraints; + } else { + av_hwframe_constraints_free(&constraints); + return NULL; + } +} + +void av_hwframe_constraints_free(AVHWFramesConstraints **constraints) +{ + if (*constraints) { + av_freep(&(*constraints)->valid_hw_formats); + av_freep(&(*constraints)->valid_sw_formats); + } + av_freep(constraints); +} diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h index 81ae817eb3..681b55566c 100644 --- a/libavutil/hwcontext.h +++ b/libavutil/hwcontext.h @@ -326,4 +326,73 @@ int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ctx, enum AVPixelFormat **formats, int flags); +/** + * This struct describes the constraints on hardware frames attached to + * a given device with a hardware-specific configuration. This is returned + * by av_hwdevice_get_hwframe_constraints() and must be freed by + * av_hwframe_constraints_free() after use. + */ +typedef struct AVHWFramesConstraints { + /** + * A list of possible values for format in the hw_frames_ctx, + * terminated by AV_PIX_FMT_NONE. This member will always be filled. + */ + enum AVPixelFormat *valid_hw_formats; + + /** + * A list of possible values for sw_format in the hw_frames_ctx, + * terminated by AV_PIX_FMT_NONE. Can be NULL if this information is + * not known. + */ + enum AVPixelFormat *valid_sw_formats; + + /** + * The minimum size of frames in this hw_frames_ctx. + * (Zero if not known.) + */ + int min_width; + int min_height; + + /** + * The maximum size of frames in this hw_frames_ctx. + * (INT_MAX if not known / no limit.) + */ + int max_width; + int max_height; +} AVHWFramesConstraints; + +/** + * Allocate a HW-specific configuration structure for a given HW device. + * After use, the user must free all members as required by the specific + * hardware structure being used, then free the structure itself with + * av_free(). + * + * @param device_ctx a reference to the associated AVHWDeviceContext. + * @return The newly created HW-specific configuration structure on + * success or NULL on failure. + */ +void *av_hwdevice_hwconfig_alloc(AVBufferRef *device_ctx); + +/** + * Get the constraints on HW frames given a device and the HW-specific + * configuration to be used with that device. If no HW-specific + * confgiuration is provided, returns the maximum possible capabilities + * of the device. + * + * @param device_ctx a reference to the associated AVHWDeviceContext. + * @param hwconfig a filled HW-specific configuration structure, or NULL + * to return the maximum possible capabilities of the device. + * @return AVHWFramesConstraints structure describing the constraints + * on the device, or NULL if not available. + */ +AVHWFramesConstraints *av_hwdevice_get_hwframe_constraints(AVBufferRef *ref, + const void *hwconfig); + +/** + * Free an AVHWFrameConstraints structure. + * + * @param constraints The (filled or unfilled) AVHWFrameConstraints structure. + */ +void av_hwframe_constraints_free(AVHWFramesConstraints **constraints); + #endif /* AVUTIL_HWCONTEXT_H */ diff --git a/libavutil/hwcontext_internal.h b/libavutil/hwcontext_internal.h index 641232f140..27de1f9e62 100644 --- a/libavutil/hwcontext_internal.h +++ b/libavutil/hwcontext_internal.h @@ -47,6 +47,12 @@ typedef struct HWContextType { */ size_t device_priv_size; + /** + * Size of the hardware-specific device configuration. + * (Used to query hwframe constraints.) + */ + size_t device_hwconfig_size; + /** * size of the public frame pool hardware-specific context, * i.e. AVHWFramesContext.hwctx @@ -61,6 +67,10 @@ typedef struct HWContextType { int (*device_init)(AVHWDeviceContext *ctx); void (*device_uninit)(AVHWDeviceContext *ctx); + int (*frames_get_constraints)(AVHWDeviceContext *ctx, + const void *hwconfig, + AVHWFramesConstraints *constraints); + int (*frames_init)(AVHWFramesContext *ctx); void (*frames_uninit)(AVHWFramesContext *ctx); diff --git a/libavutil/version.h b/libavutil/version.h index ebd548fe0d..b102e93fa0 100644 --- a/libavutil/version.h +++ b/libavutil/version.h @@ -54,7 +54,7 @@ */ #define LIBAVUTIL_VERSION_MAJOR 55 -#define LIBAVUTIL_VERSION_MINOR 6 +#define LIBAVUTIL_VERSION_MINOR 7 #define LIBAVUTIL_VERSION_MICRO 0 #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \