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ffmpeg/ffmpeg-dlopen-openh264.patch

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From 6cd7b3f91c45176b48c1138a3534cf7b63010952 Mon Sep 17 00:00:00 2001
From: Neal Gompa <ngompa@fedoraproject.org>
Date: Thu, 17 Feb 2022 07:44:32 -0500
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: Neal Gompa <ngompa@fedoraproject.org>
---
configure | 3 +
libavcodec/libopenh264.c | 11 +++
libavcodec/libopenh264_dlopen.h | 164 ++++++++++++++++++++++++++++++++
libavcodec/libopenh264dec.c | 9 ++
libavcodec/libopenh264enc.c | 9 ++
5 files changed, 196 insertions(+)
create mode 100644 libavcodec/libopenh264_dlopen.h
diff --git a/configure b/configure
index 6b5ef6332e..f08e566e98 100755
--- a/configure
+++ b/configure
@@ -250,6 +250,7 @@ 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
@@ -1839,6 +1840,7 @@ EXTERNAL_LIBRARY_LIST="
libmysofa
libopencv
libopenh264
+ libopenh264_dlopen
libopenjpeg
libopenmpt
libopenvino
@@ -6575,6 +6577,7 @@ enabled libopencv && { check_headers opencv2/core/core_c.h &&
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++"
diff --git a/libavcodec/libopenh264.c b/libavcodec/libopenh264.c
index 59c61a3a4c..1dcf8e17d0 100644
--- a/libavcodec/libopenh264.c
+++ b/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/log.h"
@@ -52,6 +57,12 @@ int ff_libopenh264_check_version(void *logctx)
// 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)
+
+#ifdef CONFIG_LIBOPENH264_DLOPEN
+ if (loadLibOpenH264(logctx))
+ return AVERROR_EXTERNAL;
+#endif
+
OpenH264Version libver = WelsGetCodecVersion();
if (memcmp(&libver, &g_stCodecVersion, sizeof(libver))) {
av_log(logctx, AV_LOG_ERROR, "Incorrect library version loaded\n");
diff --git a/libavcodec/libopenh264_dlopen.h b/libavcodec/libopenh264_dlopen.h
new file mode 100644
index 0000000000..c58fcd704d
--- /dev/null
+++ b/libavcodec/libopenh264_dlopen.h
@@ -0,0 +1,164 @@
+/*!
+ *@page License
+ *
+ * \copy
+ * Copyright (c) 2022, Andreas Schneider <asn@cryptomilk.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifdef CONFIG_LIBOPENH264_DLOPEN
+
+#include <dlfcn.h>
+
+#include <wels/codec_api.h>
+#include <wels/codec_ver.h>
+
+#include "avcodec.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;
+
+static int oh264_WelsCreateSVCEncoder(ISVCEncoder **ppEncoder) {
+ return openh264_symbols._oh264_WelsCreateSVCEncoder.f(ppEncoder);
+}
+#define WelsCreateSVCEncoder oh264_WelsCreateSVCEncoder
+
+static void oh264_WelsDestroySVCEncoder(ISVCEncoder *pEncoder) {
+ return openh264_symbols._oh264_WelsDestroySVCEncoder.f(pEncoder);
+}
+#define WelsDestroySVCEncoder oh264_WelsDestroySVCEncoder
+
+static int oh264_WelsGetDecoderCapability(SDecoderCapability *pDecCapability) {
+ return openh264_symbols._oh264_WelsGetDecoderCapability.f(pDecCapability);
+}
+#define WelsGetDecoderCapability oh264_WelsGetDecoderCapability
+
+static long oh264_WelsCreateDecoder(ISVCDecoder **ppDecoder) {
+ return openh264_symbols._oh264_WelsCreateDecoder.f(ppDecoder);
+}
+#define WelsCreateDecoder oh264_WelsCreateDecoder
+
+static void oh264_WelsDestroyDecoder(ISVCDecoder *pDecoder) {
+ return openh264_symbols._oh264_WelsDestroyDecoder.f(pDecoder);
+}
+#define WelsDestroyDecoder oh264_WelsDestroyDecoder
+
+static OpenH264Version oh264_WelsGetCodecVersion(void) {
+ return openh264_symbols._oh264_WelsGetCodecVersion.f();
+}
+#define WelsGetCodecVersion oh264_WelsGetCodecVersion
+
+static void oh264_WelsGetCodecVersionEx(OpenH264Version *pVersion) {
+ openh264_symbols._oh264_WelsGetCodecVersionEx.f(pVersion);
+}
+#define WelsGetCodecVersionEx oh264_WelsGetCodecVersionEx
+
+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; \
+ } \
+ }
+
+static int loadLibOpenH264(AVCodecContext *avctx) {
+ void *libopenh264 = NULL;
+ const char *err = NULL;
+
+#define OPENH264_LIB "libopenh264.so.6"
+ 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) {
+ 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);
+
+ return 0;
+}
+
+#endif // CONFIG_LIBOPENH264_DLOPEN
diff --git a/libavcodec/libopenh264dec.c b/libavcodec/libopenh264dec.c
index 7f5e85402a..34b238519e 100644
--- a/libavcodec/libopenh264dec.c
+++ b/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"
@@ -55,6 +59,11 @@ static av_cold int svc_decode_init(AVCodecContext *avctx)
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 err;
diff --git a/libavcodec/libopenh264enc.c b/libavcodec/libopenh264enc.c
index de4b85c411..644458a5bb 100644
--- a/libavcodec/libopenh264enc.c
+++ b/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"
@@ -136,6 +140,11 @@ static av_cold int svc_encode_init(AVCodecContext *avctx)
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 err;
--
2.34.1
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