/*
 * Copyright (C) 2016 Glyptodon, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef GUACENC_FFMPEG_COMPAT_H
#define GUACENC_FFMPEG_COMPAT_H

#include "config.h"
#include "video.h"

#include <libavcodec/avcodec.h>

/*
 * For a full list of FFmpeg API changes over the years, see:
 *
 *     https://github.com/FFmpeg/FFmpeg/blob/master/doc/APIchanges
 */

/* For libavcodec < 55.28.1: av_frame_*() was avcodec_*_frame(). */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)
#define av_frame_alloc avcodec_alloc_frame
#define av_frame_free avcodec_free_frame
#endif

/* For libavcodec < 54.28.0: old avcodec_free_frame() did not exist. */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(54,28,0)
#define avcodec_free_frame av_freep
#endif

/* For libavcodec < 55.52.0: avcodec_free_context did not exist */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,52,0)
#define avcodec_free_context av_freep
#endif

/* For libavcodec < 57.7.0: av_packet_unref() was av_free_packet() */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57,7,0)
#define av_packet_unref av_free_packet
#endif

/* For libavutil < 51.42.0: AV_PIX_FMT_* was PIX_FMT_* */
#if LIBAVUTIL_VERSION_INT < AV_VERSION_INT(51,42,0)
#define AV_PIX_FMT_RGB32 PIX_FMT_RGB32
#define AV_PIX_FMT_YUV420P PIX_FMT_YUV420P
#endif

/**
 * Writes the specied frame as a new frame of video. If pending frames of the
 * video are being flushed, the given frame may be NULL (as required by
 * avcodec_encode_video2()). If avcodec_encode_video2() does not exist, this
 * function will transparently use avcodec_encode_video().
 *
 * @param video
 *     The video to write the given frame to.
 *
 * @param frame
 *     The frame to write to the video, or NULL if previously-written frames
 *     are being flushed.
 *
 * @return
 *     A positive value if the frame was successfully written, zero if the
 *     frame has been saved for later writing / reordering, negative if an
 *     error occurs.
 */
int guacenc_avcodec_encode_video(guacenc_video* video, AVFrame* frame);

#endif