e8e152799b
This CL changes libvpx to call a function when a frame buffer is needed for decode. Libvpx will call a release callback when no other frames reference the frame buffer. This CL adds a default implementation of the frame buffer callbacks. Currently only VP9 is supported. A future CL will add support for applications to supply their own frame buffer callbacks. Change-Id: I1405a320118f1cdd95f80c670d52b085a62cb10d
75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
/*
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* Copyright (c) 2014 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_VPX_FRAME_BUFFER_H_
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#define VPX_VPX_FRAME_BUFFER_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "./vpx_integer.h"
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/*!\brief The maximum number of work buffers used by libvpx.
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*/
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#define VPX_MAXIMUM_WORK_BUFFERS 1
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/*!\brief The maximum number of reference buffers that a VP9 encoder may use.
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*/
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#define VP9_MAXIMUM_REF_BUFFERS 8
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/*!\brief External frame buffer
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*
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* This structure holds allocated frame buffers used by the decoder.
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*/
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typedef struct vpx_codec_frame_buffer {
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uint8_t *data; /**< Pointer to the data buffer */
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size_t size; /**< Size of data in bytes */
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void *priv; /**< Frame's private data */
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} vpx_codec_frame_buffer_t;
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/*!\brief get frame buffer callback prototype
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*
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* This callback is invoked by the decoder to retrieve data for the frame
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* buffer in order for the decode call to complete. The callback must
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* allocate at least min_size in bytes and assign it to fb->data. Then the
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* callback must set fb->size to the allocated size. The application does not
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* need to align the allocated data. The callback is triggered when the
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* decoder needs a frame buffer to decode a compressed image into. This
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* function may be called more than once for every call to vpx_codec_decode.
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* The application may set fb->priv to some data which will be passed
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* back in the ximage and the release function call. On success the callback
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* must return 0. Any failure the callback must return a value less than 0.
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*
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* \param[in] priv Callback's private data
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* \param[in] new_size Size in bytes needed by the buffer
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* \param[in,out] fb Pointer to vpx_codec_frame_buffer_t
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*/
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typedef int (*vpx_get_frame_buffer_cb_fn_t)(
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void *priv, size_t min_size, vpx_codec_frame_buffer_t *fb);
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/*!\brief release frame buffer callback prototype
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*
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* This callback is invoked by the decoder when the frame buffer is not
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* referenced by any other buffers. On success the callback must return 0.
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* Any failure the callback must return a value less than 0.
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*
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* \param[in] priv Callback's private data
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* \param[in] fb Pointer to vpx_codec_frame_buffer_t
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*/
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typedef int (*vpx_release_frame_buffer_cb_fn_t)(
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void *priv, vpx_codec_frame_buffer_t *fb);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_VPX_FRAME_BUFFER_H_
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