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File ffmpeg-dlopen-openh264.patch of Package ffmpeg-5
From 4739b0c97b3378bdaf737171777fe9a71a53eff1 Mon Sep 17 00:00:00 2001 From: Neal Gompa <ngompa@fedoraproject.org> Date: Wed, 12 Oct 2022 09:41:27 -0400 Subject: [PATCH] avcodec/openh264: Add the ability to dlopen() OpenH264 We can't directly depend on OpenH264, but we can weakly link to it and gracefully expose the capability. Co-authored-by: Andreas Schneider <asn@cryptomilk.org> Co-authored-by: Neal Gompa <ngompa@fedoraproject.org> Signed-off-by: Andreas Schneider <asn@cryptomilk.org> Signed-off-by: Neal Gompa <ngompa@fedoraproject.org> --- configure | 3 + libavcodec/Makefile | 1 + libavcodec/libopenh264.c | 18 +++- libavcodec/libopenh264_dlopen.c | 147 ++++++++++++++++++++++++++++++++ libavcodec/libopenh264_dlopen.h | 58 +++++++++++++ libavcodec/libopenh264dec.c | 10 +++ libavcodec/libopenh264enc.c | 10 +++ 7 files changed, 245 insertions(+), 2 deletions(-) create mode 100644 libavcodec/libopenh264_dlopen.c create mode 100644 libavcodec/libopenh264_dlopen.h Index: ffmpeg-5.1.3/configure =================================================================== --- ffmpeg-5.1.3.orig/configure +++ ffmpeg-5.1.3/configure @@ -252,6 +252,7 @@ External library support: --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no] --enable-libopencv enable video filtering via libopencv [no] --enable-libopenh264 enable H.264 encoding via OpenH264 [no] + --enable-libopenh264-dlopen enable H.264 encoding via dlopen()'ed OpenH264 [no] --enable-libopenjpeg enable JPEG 2000 de/encoding via OpenJPEG [no] --enable-libopenmpt enable decoding tracked files via libopenmpt [no] --enable-libopenvino enable OpenVINO as a DNN module backend @@ -1846,6 +1847,7 @@ EXTERNAL_LIBRARY_LIST=" libmysofa libopencv libopenh264 + libopenh264_dlopen libopenjpeg libopenmpt libopenvino @@ -6599,6 +6601,7 @@ enabled libopencv && { check_hea require libopencv opencv2/core/core_c.h cvCreateImageHeader -lopencv_core -lopencv_imgproc; } || require_pkg_config libopencv opencv opencv/cxcore.h cvCreateImageHeader; } enabled libopenh264 && require_pkg_config libopenh264 openh264 wels/codec_api.h WelsGetCodecVersion +enabled libopenh264_dlopen && enable libopenh264 && add_cppflags "-I$(dirname `readlink -f $0`)/ffdlopenhdrs/include -DCONFIG_LIBOPENH264_DLOPEN=1" enabled libopenjpeg && { check_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version || { require_pkg_config libopenjpeg "libopenjp2 >= 2.1.0" openjpeg.h opj_version -DOPJ_STATIC && add_cppflags -DOPJ_STATIC; } } enabled libopenmpt && require_pkg_config libopenmpt "libopenmpt >= 0.2.6557" libopenmpt/libopenmpt.h openmpt_module_create -lstdc++ && append libopenmpt_extralibs "-lstdc++" Index: ffmpeg-5.1.3/libavcodec/Makefile =================================================================== --- ffmpeg-5.1.3.orig/libavcodec/Makefile +++ ffmpeg-5.1.3/libavcodec/Makefile @@ -1075,6 +1075,7 @@ OBJS-$(CONFIG_LIBMP3LAME_ENCODER) OBJS-$(CONFIG_LIBOPENCORE_AMRNB_DECODER) += libopencore-amr.o OBJS-$(CONFIG_LIBOPENCORE_AMRNB_ENCODER) += libopencore-amr.o OBJS-$(CONFIG_LIBOPENCORE_AMRWB_DECODER) += libopencore-amr.o +OBJS-$(CONFIG_LIBOPENH264_DLOPEN) += libopenh264_dlopen.o OBJS-$(CONFIG_LIBOPENH264_DECODER) += libopenh264dec.o libopenh264.o OBJS-$(CONFIG_LIBOPENH264_ENCODER) += libopenh264enc.o libopenh264.o OBJS-$(CONFIG_LIBOPENJPEG_DECODER) += libopenjpegdec.o Index: ffmpeg-5.1.3/libavcodec/libopenh264.c =================================================================== --- ffmpeg-5.1.3.orig/libavcodec/libopenh264.c +++ ffmpeg-5.1.3/libavcodec/libopenh264.c @@ -20,8 +20,13 @@ */ #include <string.h> + +#ifdef CONFIG_LIBOPENH264_DLOPEN +#include "libopenh264_dlopen.h" +#else #include <wels/codec_api.h> #include <wels/codec_ver.h> +#endif #include "libavutil/error.h" #include "libavutil/log.h" @@ -52,8 +57,17 @@ int ff_libopenh264_check_version(void *l // Mingw GCC < 4.7 on x86_32 uses an incorrect/buggy ABI for the WelsGetCodecVersion // function (for functions returning larger structs), thus skip the check in those // configurations. -#if !defined(_WIN32) || !defined(__GNUC__) || !ARCH_X86_32 || AV_GCC_VERSION_AT_LEAST(4, 7) - OpenH264Version libver = WelsGetCodecVersion(); + // Also, for dlopened OpenH264, we should not do the version check. It's too punitive. +#if !defined(_WIN32) || !defined(__GNUC__) || !ARCH_X86_32 || AV_GCC_VERSION_AT_LEAST(4, 7) || !defined(CONFIG_LIBOPENH264_DLOPEN) + OpenH264Version libver; + +#ifdef CONFIG_LIBOPENH264_DLOPEN + if (loadLibOpenH264(logctx)) { + return AVERROR_EXTERNAL; + } +#endif + + libver = WelsGetCodecVersion(); if (memcmp(&libver, &g_stCodecVersion, sizeof(libver))) { av_log(logctx, AV_LOG_ERROR, "Incorrect library version loaded\n"); return AVERROR(EINVAL); Index: ffmpeg-5.1.3/libavcodec/libopenh264_dlopen.c =================================================================== --- /dev/null +++ ffmpeg-5.1.3/libavcodec/libopenh264_dlopen.c @@ -0,0 +1,147 @@ +/* + * OpenH264 dlopen code + * + * Copyright (C) 2022 Andreas Schneider <asn@cryptomilk.org> + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <dlfcn.h> + +#include "libopenh264_dlopen.h" + +/* + * The symbol binding makes sure we do not run into strict aliasing issues which + * can lead into segfaults. + */ +typedef int (*__oh264_WelsCreateSVCEncoder)(ISVCEncoder **); +typedef void (*__oh264_WelsDestroySVCEncoder)(ISVCEncoder *); +typedef int (*__oh264_WelsGetDecoderCapability)(SDecoderCapability *); +typedef long (*__oh264_WelsCreateDecoder)(ISVCDecoder **); +typedef void (*__oh264_WelsDestroyDecoder)(ISVCDecoder *); +typedef OpenH264Version (*__oh264_WelsGetCodecVersion)(void); +typedef void (*__oh264_WelsGetCodecVersionEx)(OpenH264Version *); + +#define OH264_SYMBOL_ENTRY(i) \ + union { \ + __oh264_##i f; \ + void *obj; \ + } _oh264_##i + +struct oh264_symbols { + OH264_SYMBOL_ENTRY(WelsCreateSVCEncoder); + OH264_SYMBOL_ENTRY(WelsDestroySVCEncoder); + OH264_SYMBOL_ENTRY(WelsGetDecoderCapability); + OH264_SYMBOL_ENTRY(WelsCreateDecoder); + OH264_SYMBOL_ENTRY(WelsDestroyDecoder); + OH264_SYMBOL_ENTRY(WelsGetCodecVersion); + OH264_SYMBOL_ENTRY(WelsGetCodecVersionEx); +}; + +/* Symbols are bound by loadLibOpenH264() */ +static struct oh264_symbols openh264_symbols; + +int oh264_WelsCreateSVCEncoder(ISVCEncoder **ppEncoder) { + return openh264_symbols._oh264_WelsCreateSVCEncoder.f(ppEncoder); +} + +void oh264_WelsDestroySVCEncoder(ISVCEncoder *pEncoder) { + return openh264_symbols._oh264_WelsDestroySVCEncoder.f(pEncoder); +} + +int oh264_WelsGetDecoderCapability(SDecoderCapability *pDecCapability) { + return openh264_symbols._oh264_WelsGetDecoderCapability.f(pDecCapability); +} + +long oh264_WelsCreateDecoder(ISVCDecoder **ppDecoder) { + return openh264_symbols._oh264_WelsCreateDecoder.f(ppDecoder); +} + +void oh264_WelsDestroyDecoder(ISVCDecoder *pDecoder) { + return openh264_symbols._oh264_WelsDestroyDecoder.f(pDecoder); +} + +OpenH264Version oh264_WelsGetCodecVersion(void) { + return openh264_symbols._oh264_WelsGetCodecVersion.f(); +} + +void oh264_WelsGetCodecVersionEx(OpenH264Version *pVersion) { + openh264_symbols._oh264_WelsGetCodecVersionEx.f(pVersion); +} + +static void *_oh264_bind_symbol(AVCodecContext *avctx, + void *handle, + const char *sym_name) { + void *sym = NULL; + + sym = dlsym(handle, sym_name); + if (sym == NULL) { + const char *err = dlerror(); + av_log(avctx, + AV_LOG_WARNING, + "%s: Failed to bind %s\n", + err, + sym_name); + return NULL; + } + + return sym; +} + +#define oh264_bind_symbol(avctx, handle, sym_name) \ + if (openh264_symbols._oh264_##sym_name.obj == NULL) { \ + openh264_symbols._oh264_##sym_name.obj = _oh264_bind_symbol(avctx, handle, #sym_name); \ + if (openh264_symbols._oh264_##sym_name.obj == NULL) { \ + return 1; \ + } \ + } + +int loadLibOpenH264(AVCodecContext *avctx) { + static bool initialized = false; + void *libopenh264 = NULL; + const char *err = NULL; + + if (initialized) { + return 0; + } + +#define OPENH264_LIB "libopenh264.so.7" + libopenh264 = dlopen(OPENH264_LIB, RTLD_LAZY); + err = dlerror(); + if (err != NULL) { + av_log(avctx, AV_LOG_WARNING, + "%s: %s is missing, openh264 support will be disabled\n", err, + OPENH264_LIB); + + if (libopenh264 != NULL) { + dlclose(libopenh264); + } + return 1; + } + + oh264_bind_symbol(avctx, libopenh264, WelsCreateSVCEncoder); + oh264_bind_symbol(avctx, libopenh264, WelsDestroySVCEncoder); + oh264_bind_symbol(avctx, libopenh264, WelsGetDecoderCapability); + oh264_bind_symbol(avctx, libopenh264, WelsCreateDecoder); + oh264_bind_symbol(avctx, libopenh264, WelsDestroyDecoder); + oh264_bind_symbol(avctx, libopenh264, WelsGetCodecVersion); + oh264_bind_symbol(avctx, libopenh264, WelsGetCodecVersionEx); + + initialized = true; + + return 0; +} Index: ffmpeg-5.1.3/libavcodec/libopenh264_dlopen.h =================================================================== --- /dev/null +++ ffmpeg-5.1.3/libavcodec/libopenh264_dlopen.h @@ -0,0 +1,58 @@ +/* + * OpenH264 dlopen code + * + * Copyright (C) 2022 Andreas Schneider <asn@cryptomilk.org> + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef HAVE_LIBOPENH264_DLOPEN_H +#define HAVE_LIBOPENH264_DLOPEN_H + +#ifdef CONFIG_LIBOPENH264_DLOPEN + +#include <wels/codec_api.h> +#include <wels/codec_ver.h> + +#include "avcodec.h" + +int oh264_WelsCreateSVCEncoder(ISVCEncoder **ppEncoder); +#define WelsCreateSVCEncoder oh264_WelsCreateSVCEncoder + +void oh264_WelsDestroySVCEncoder(ISVCEncoder *pEncoder); +#define WelsDestroySVCEncoder oh264_WelsDestroySVCEncoder + +int oh264_WelsGetDecoderCapability(SDecoderCapability *pDecCapability); +#define WelsGetDecoderCapability oh264_WelsGetDecoderCapability + +long oh264_WelsCreateDecoder(ISVCDecoder **ppDecoder); +#define WelsCreateDecoder oh264_WelsCreateDecoder + +void oh264_WelsDestroyDecoder(ISVCDecoder *pDecoder); +#define WelsDestroyDecoder oh264_WelsDestroyDecoder + +OpenH264Version oh264_WelsGetCodecVersion(void); +#define WelsGetCodecVersion oh264_WelsGetCodecVersion + +void oh264_WelsGetCodecVersionEx(OpenH264Version *pVersion); +#define WelsGetCodecVersionEx oh264_WelsGetCodecVersionEx + +int loadLibOpenH264(AVCodecContext *avctx); + +#endif /* CONFIG_LIBOPENH264_DLOPEN */ + +#endif /* HAVE_LIBOPENH264_DLOPEN_H */ Index: ffmpeg-5.1.3/libavcodec/libopenh264dec.c =================================================================== --- ffmpeg-5.1.3.orig/libavcodec/libopenh264dec.c +++ ffmpeg-5.1.3/libavcodec/libopenh264dec.c @@ -19,8 +19,12 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#ifdef CONFIG_LIBOPENH264_DLOPEN +#include "libopenh264_dlopen.h" +#else #include <wels/codec_api.h> #include <wels/codec_ver.h> +#endif #include "libavutil/common.h" #include "libavutil/fifo.h" @@ -56,6 +60,12 @@ static av_cold int svc_decode_init(AVCod int log_level; WelsTraceCallback callback_function; +#ifdef CONFIG_LIBOPENH264_DLOPEN + if (loadLibOpenH264(avctx)) { + return AVERROR_DECODER_NOT_FOUND; + } +#endif + if ((err = ff_libopenh264_check_version(avctx)) < 0) return AVERROR_DECODER_NOT_FOUND; Index: ffmpeg-5.1.3/libavcodec/libopenh264enc.c =================================================================== --- ffmpeg-5.1.3.orig/libavcodec/libopenh264enc.c +++ ffmpeg-5.1.3/libavcodec/libopenh264enc.c @@ -19,8 +19,12 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#ifdef CONFIG_LIBOPENH264_DLOPEN +#include "libopenh264_dlopen.h" +#else #include <wels/codec_api.h> #include <wels/codec_ver.h> +#endif #include "libavutil/attributes.h" #include "libavutil/common.h" @@ -137,6 +141,12 @@ static av_cold int svc_encode_init(AVCod WelsTraceCallback callback_function; AVCPBProperties *props; +#ifdef CONFIG_LIBOPENH264_DLOPEN + if (loadLibOpenH264(avctx)) { + return AVERROR_ENCODER_NOT_FOUND; + } +#endif + if ((err = ff_libopenh264_check_version(avctx)) < 0) return AVERROR_ENCODER_NOT_FOUND;
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