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https://github.com/mpv-player/mpv
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This is somewhat imperfect, because detection of hw decoding APIs is mostly done on demand, and often avoided if not necessary. (For example, we know very well that there are no hw decoders for certain codecs.) This also requires every hwdec backend to identify itself (see hwdec.h changes).
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
#ifndef MP_HWDEC_H_
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#define MP_HWDEC_H_
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struct mp_image_pool;
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// keep in sync with --hwdec option
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enum hwdec_type {
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HWDEC_AUTO = -1,
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HWDEC_NONE = 0,
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HWDEC_VDPAU = 1,
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HWDEC_VDA = 2,
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HWDEC_VAAPI = 4,
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HWDEC_VAAPI_COPY = 5,
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HWDEC_DXVA2_COPY = 6,
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};
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struct mp_hwdec_ctx {
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enum hwdec_type type;
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void *priv; // for free use by hwdec implementation
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// API-specific, not needed by all backends.
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struct mp_vdpau_ctx *vdpau_ctx;
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struct mp_vaapi_ctx *vaapi_ctx;
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// Optional.
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// Allocates a software image from the pool, downloads the hw image from
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// mpi, and returns it.
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// pool can be NULL (then just use straight allocation).
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// Return NULL on error or if mpi has the wrong format.
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struct mp_image *(*download_image)(struct mp_hwdec_ctx *ctx,
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struct mp_image *mpi,
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struct mp_image_pool *swpool);
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};
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// Used to communicate hardware decoder API handles from VO to video decoder.
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// The VO can set the context pointer for supported APIs.
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struct mp_hwdec_info {
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// (Since currently only 1 hwdec API is loaded at a time, this pointer
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// simply maps to the loaded one.)
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struct mp_hwdec_ctx *hwctx;
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// Can be used to lazily load a requested API.
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// api_name is e.g. "vdpau" (like the fields above, without "_ctx")
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// Can be NULL, is idempotent, caller checks hwctx fields for success/access.
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// Due to threading, the callback is the only code that is allowed to
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// change fields in this struct after initialization.
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void (*load_api)(struct mp_hwdec_info *info, const char *api_name);
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void *load_api_ctx;
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};
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// Trivial helper to call info->load_api().
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// Implemented in vd_lavc.c.
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void hwdec_request_api(struct mp_hwdec_info *info, const char *api_name);
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#endif
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