FFmpegUtilities.h

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/**
 * @file
 * @brief Header file for FFmpegUtilities
 * @author Jonathan Thomas <jonathan@openshot.org>
 *
 * @section LICENSE
 *
 * Copyright (c) 2008-2014 OpenShot Studios, LLC
 * <http://www.openshotstudios.com/>. This file is part of
 * OpenShot Library (libopenshot), an open-source project dedicated to
 * delivering high quality video editing and animation solutions to the
 * world. For more information visit <http://www.openshot.org/>.
 *
 * OpenShot Library (libopenshot) is free software: you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * OpenShot Library (libopenshot) is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef OPENSHOT_FFMPEG_UTILITIES_H
#define OPENSHOT_FFMPEG_UTILITIES_H

        // Required for libavformat to build on Windows
        #ifndef INT64_C
        #define INT64_C(c) (c ## LL)
        #define UINT64_C(c) (c ## ULL)
        #endif

        // Include the FFmpeg headers
        extern "C" {
                #include <libavcodec/avcodec.h>
                #include <libavformat/avformat.h>
                #include <libswscale/swscale.h>
                #include <libavresample/avresample.h>
                #include <libavutil/mathematics.h>
                #include <libavutil/pixfmt.h>
                #include <libavutil/pixdesc.h>

                // libavutil changed folders at some point
                #if LIBAVFORMAT_VERSION_MAJOR >= 53
                        #include <libavutil/opt.h>
                #else
                        #include <libavcodec/opt.h>
                #endif

                // channel header refactored
                #if LIBAVFORMAT_VERSION_MAJOR >= 54
                        #include <libavutil/channel_layout.h>
                #endif
        }

        // This was removed from newer versions of FFmpeg (but still used in libopenshot)
        #ifndef AVCODEC_MAX_AUDIO_FRAME_SIZE
                #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
        #endif
        #ifndef AV_ERROR_MAX_STRING_SIZE
                #define AV_ERROR_MAX_STRING_SIZE 64
        #endif
        #ifndef AUDIO_PACKET_ENCODING_SIZE
                #define AUDIO_PACKET_ENCODING_SIZE 768000               // 48khz * S16 (2 bytes) * max channels (8)
        #endif

        // This wraps an unsafe C macro to be C++ compatible function
        static const std::string av_make_error_string(int errnum)
        {
                char errbuf[AV_ERROR_MAX_STRING_SIZE];
                av_strerror(errnum, errbuf, AV_ERROR_MAX_STRING_SIZE);
                std::string errstring(errbuf);
                return errstring;
        }

        // Redefine the C macro to use our new C++ function
        #undef av_err2str
        #define av_err2str(errnum) av_make_error_string(errnum).c_str()

        // Define this for compatibility
        #ifndef PixelFormat
                #define PixelFormat AVPixelFormat
    #endif
        #ifndef PIX_FMT_RGBA
                #define PIX_FMT_RGBA AV_PIX_FMT_RGBA
    #endif
        #ifndef PIX_FMT_NONE
                #define PIX_FMT_NONE AV_PIX_FMT_NONE
    #endif
        #ifndef PIX_FMT_RGB24
                #define PIX_FMT_RGB24 AV_PIX_FMT_RGB24
        #endif
        #ifndef PIX_FMT_YUV420P
                #define PIX_FMT_YUV420P AV_PIX_FMT_YUV420P
        #endif

        #if LIBAVFORMAT_VERSION_MAJOR >= 55
                #define AV_ALLOCATE_FRAME() av_frame_alloc()
                #define AV_RESET_FRAME(av_frame) av_frame_unref(av_frame)
        #define AV_FREE_FRAME(av_frame) av_frame_free(av_frame)
        #else
                #define AV_ALLOCATE_FRAME() avcodec_alloc_frame()
                #define AV_RESET_FRAME(av_frame) avcodec_get_frame_defaults(av_frame)
                #define AV_FREE_FRAME(av_frame) avcodec_free_frame(av_frame)
    #endif


#endif