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218 lines
7 KiB
C
218 lines
7 KiB
C
/*
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* Copyright (c) 2012 FXI Technologies
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*
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* This library is licensed under 2 different licenses and you
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* can choose to use it under the terms of any one of them. The
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* two licenses are the Apache License 2.0 and the LGPL.
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*
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* Apache License 2.0:
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* LGPL:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/*
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* Author: Haavard Kvaalen <havardk@fxitech.com>
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*/
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/*
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* Interface for decoding of various video formats using the Samsung
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* Multi-Format Video Codec (MFC).
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*/
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#ifndef VIDEO_EXYNOS4_MFC_V4L2_INCLUDE_MFC_DECODER_H
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#define VIDEO_EXYNOS4_MFC_V4L2_INCLUDE_MFC_DECODER_H
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#include <sys/time.h>
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struct mfc_buffer;
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struct mfc_dec_context;
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enum mfc_codec_type {
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CODEC_TYPE_H264,
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CODEC_TYPE_VC1, /* VC1 advanced profile */
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CODEC_TYPE_VC1_RCV, /* VC1 simple/main profile */
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CODEC_TYPE_MPEG4,
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CODEC_TYPE_MPEG1,
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CODEC_TYPE_MPEG2,
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CODEC_TYPE_H263,
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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void mfc_dec_init_debug (void);
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/*
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* Open the MFC decoding device node, and allocate input buffers.
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*
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* Returns a mfc_dec_context. Note that the context can only be used
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* for decoding one stream, i.e. mfc_dec_init can only be called once.
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*
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* Args:
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* codec: Codec type (this can later be changed with mfc_set_codec()).
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* num_input_buffers: Numbers of input buffers. There is never any
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* need to enqueue more than one buffer for correct decoding.
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*
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* Returns: A new mfc_dec_context if successful, NULL on error. This
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* context is needed for most other calls below, and should be
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* deallocated with mfc_dec_destroy().
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*/
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struct mfc_dec_context* mfc_dec_create(enum mfc_codec_type codec);
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int mfc_dec_init_input(struct mfc_dec_context*, int num_input_buffers);
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/*
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* Destroy context created with mfc_dec_create().
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*/
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void mfc_dec_destroy(struct mfc_dec_context*);
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/*
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* Initialize video decode. Before this function is called, the
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* initial input frame (which contains the header) must be enqueued.
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*
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* This function allocate output buffers. All output buffers will be
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* enqueued initially. The actual number of output buffers depend on the
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*
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* Args:
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* extra_buffers: Numbers of output buffers that can be kept
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* dequeued at any time.
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*
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* Returns: Zero for success, negative value on failure.
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*/
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int mfc_dec_init_output(struct mfc_dec_context*, int extra_buffers);
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/*
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* This function may be called only before mfc_dec_init(). It is only
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* necessary to call if the codec type is different from the one
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* supplied to mfc_dec_create().
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*
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* Args:
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* codec: Codec type
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*
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* Returns: Zero for success, negative value on failure.
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*/
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int mfc_dec_set_codec(struct mfc_dec_context*, enum mfc_codec_type codec);
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/*
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* Get size of image output from the MFC. The data might be larger
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* than the actual video because of MFC alignment requirements (see
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* the crop size below). This function can only be called after
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* mfc_dec_init() has been called.
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*
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* Args:
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* w: Width (output).
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* h: Height (output).
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*
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* Returns: Zero for success, negative value on failure.
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*/
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void mfc_dec_get_output_size(struct mfc_dec_context*, int *w, int *h);
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void mfc_dec_get_output_stride(struct mfc_dec_context*, int *ystride, int *uvstride);
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void mfc_dec_get_crop_size(struct mfc_dec_context*,
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int *left, int *top, int *w, int *h);
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/*
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* Check if there are output frames that can be dequeued.
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*
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* Returns: Positive value if a frame is available, zero if not.
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*/
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int mfc_dec_output_available(struct mfc_dec_context*);
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/*
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* This module use 'input' and 'output' for input to, and output from
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* the MFC. The VFL2 names for these interfaces are OUTPUT (for the
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* input) and CAPTURE (for the output).
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*
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* These functions return zero for success, negative value on failure.
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*
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* When the end of stream has been reached, an empty input frame
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* should be enqueued after the last valid input frame. This signal
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* to the MFC that EOS has been reached. After this no more input
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* frames can be enqueued.
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*/
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/* Enqueue frame containing compressed data */
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int mfc_dec_enqueue_input(struct mfc_dec_context*, struct mfc_buffer *buffer, struct timeval *timestamp);
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/*
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* Dequeue a processed input frame. Will block until one is available.
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*
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* Returns 0 on success, -1 on failure, and -2 on timeout. A timeout
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* typically happens if there are no free output buffers available.
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*/
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int mfc_dec_dequeue_input(struct mfc_dec_context*, struct mfc_buffer **buffer);
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/* Enqueue empty output frame */
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int mfc_dec_enqueue_output(struct mfc_dec_context*, struct mfc_buffer *buffer);
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/*
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* Dequeue output frame with image data. This should only be called
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* when mfc_dec_output_available() returns true. If this is called
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* when mfc_dec_output_available() is not true, subsequent video
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* frames may not decode correctly.
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*/
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int mfc_dec_dequeue_output(struct mfc_dec_context*, struct mfc_buffer **buffer, struct timeval *timestamp);
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/*
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* Flush (discard) all enqueued output and input frames. This is
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* typically used if we want to seek.
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*
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* Calling flush resets the "end of stream" state that is entered by
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* enqueuing an empty input frame. Thus it is safe to seek at the end
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* of the stream as long as mfc_dec_flush() is called first.
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*/
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int mfc_dec_flush(struct mfc_dec_context*);
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/*
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* Get pointer to the input data in 'buffer'.
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*/
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void* mfc_buffer_get_input_data(struct mfc_buffer *buffer);
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/*
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* Get maximum size of input buffer 'buffer' in bytes.
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*/
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int mfc_buffer_get_input_max_size(struct mfc_buffer *buffer);
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/*
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* Set size of data that has been put into 'buffer' in bytes.
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*/
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void mfc_buffer_set_input_size(struct mfc_buffer *buffer, int size);
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/*
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* Get pointers to data in output buffer 'buffer'.
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*/
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void mfc_buffer_get_output_data(struct mfc_buffer *buffer,
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void **ybuf, void **uvbuf);
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#ifdef __cplusplus
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}
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#endif
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#endif /* VIDEO_EXYNOS4_MFC_V4L2_INCLUDE_MFC_DECODER_H */
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