build: add android content uri support to FFmpeg

configure.py

@@ -121,6 +121,14 @@ def _gen_android_cross_file(cfg):
         url="https://ffmpeg.org/releases/ffmpeg-@[email protected]",
         dst_file="ffmpeg-@[email protected]",
         sha256="8684f4b00f94b85461884c3719382f1261f0d9eb3d59640a1f4ac0873616f968",
+        patches=[
+            "0001-avcodec-add-av_jni_-get-set-_android_app_ctx-helper.patch",
+            "0002-avformat-add-Android-content-resolver-protocol-suppo.patch",
+            "0003-avcodec-jni-use-size_t-to-store-structure-offsets.patch",
+            "0004-avcodec-jni-remove-unnecessary-NULL-checks-before-ca.patch",
+            "0005-avcodec-mediacodec_wrapper-use-an-OFFSET-macro-where.patch",
+            "0006-avcodec-mediacodec_wrapper-remove-unnecessary-NULL-c.patch",
+        ],
     ),
     ffmpeg_Windows=dict(
         version="6.1.1",
@@ -317,13 +325,15 @@ def _download_extract(args, dep_item):
         assert _file_chk(dst_path, chksum)
 
     # Extract
+    extracted = False
     if tarfile.is_tarfile(dst_path):
         with tarfile.open(dst_path) as tar:
             dirs = {f.name for f in tar.getmembers() if f.isdir()}
             extract_dir = op.join(dst_base, dst_dir or _guess_base_dir(dirs))
             if not op.exists(extract_dir):
                 logging.info("extracting %s", dst_file)
                 tar.extractall(op.join(dst_base, dst_dir))
+                extracted = True
 
     elif zipfile.is_zipfile(dst_path):
         with zipfile.ZipFile(dst_path) as zip_:
@@ -332,9 +342,17 @@ def _download_extract(args, dep_item):
             if not op.exists(extract_dir):
                 logging.info("extracting %s", dst_file)
                 zip_.extractall(op.join(dst_base, dst_dir))
+                extracted = True
     else:
         assert False
 
+    # Patch
+    if extracted:
+        patch_basedir = op.join(_ROOTDIR, "patches", name)
+        for patch in dep.get("patches", []):
+            patch_path = op.join(patch_basedir, patch)
+            run(["patch", "-p1", "-i", patch_path], cwd=extract_dir)
+
     # Remove previous link if needed
     target = op.join(dst_base, name)
     rel_extract_dir = op.basename(extract_dir)
@@ -513,6 +531,7 @@ def _ffmpeg_setup(cfg):
             "http",
             "https",
             "pipe",
+            "android_content",
         ]
         filters = [
             "aformat",

patches/ffmpeg/0001-avcodec-add-av_jni_-get-set-_android_app_ctx-helper.patch

@@ -0,0 +1,97 @@
+From 15533f90bc98b4cebd84b4ead2d0dd322b4f8ea7 Mon Sep 17 00:00:00 2001
+From: Matthieu Bouron <[email protected]>
+Date: Mon, 12 Feb 2024 23:13:09 +0100
+Subject: [PATCH 1/6] avcodec: add av_jni_{get,set}_android_app_ctx helper
+
+This will allow users to pass the Android ApplicationContext which is mandatory
+to retrieve the ContentResolver responsible to resolve/open Android content-uri.
+---
+ libavcodec/jni.c | 40 ++++++++++++++++++++++++++++++++++++++++
+ libavcodec/jni.h | 17 +++++++++++++++++
+ 2 files changed, 57 insertions(+)
+
+diff --git a/libavcodec/jni.c b/libavcodec/jni.c
+index ae6490de9d..7d04d0a268 100644
+--- a/libavcodec/jni.c
++++ b/libavcodec/jni.c
+@@ -64,6 +64,36 @@ void *av_jni_get_java_vm(void *log_ctx)
+     return vm;
+ }
+
++int av_jni_set_android_app_ctx(void *app_ctx, void *log_ctx)
++{
++    JNIEnv *env = avpriv_jni_get_env(c);
++    if (!env)
++        return AVERROR(EINVAL);
++
++    jobjectRefType type = (*env)->GetObjectRefType(env, app_ctx);
++    if (type != JNIGlobalRefType) {
++        av_log(log_ctx, AV_LOG_ERROR, "Application context must be passed as a global reference");
++        return AVERROR(EINVAL);
++    }
++
++    pthread_mutex_lock(&lock);
++    android_app_ctx = app_ctx;
++    pthread_mutex_unlock(&lock);
++
++    return 0;
++}
++
++void *av_jni_get_android_app_ctx(void)
++{
++    void *ctx;
++
++    pthread_mutex_lock(&lock);
++    ctx = android_app_ctx;
++    pthread_mutex_unlock(&lock);
++
++    return ctx;
++}
++
+ #else
+
+ int av_jni_set_java_vm(void *vm, void *log_ctx)
+@@ -76,4 +106,14 @@ void *av_jni_get_java_vm(void *log_ctx)
+     return NULL;
+ }
+
++int av_jni_set_android_app_ctx(void *app_ctx, void *log_ctx)
++{
++    return AVERROR(ENOSYS);
++}
++
++void *av_jni_get_android_app_ctx(void)
++{
++    return NULL;
++}
++
+ #endif
+diff --git a/libavcodec/jni.h b/libavcodec/jni.h
+index dd99e92611..da8025f830 100644
+--- a/libavcodec/jni.h
++++ b/libavcodec/jni.h
+@@ -43,4 +43,21 @@ int av_jni_set_java_vm(void *vm, void *log_ctx);
+  */
+ void *av_jni_get_java_vm(void *log_ctx);
+
++/*
++ * Set the Android application context which will be used to retrieve the Android
++ * content resolver to resolve content uris.
++ *
++ * @param app_ctx global JNI reference to the Android application context
++ * @return 0 on success, < 0 otherwise
++ */
++int av_jni_set_android_app_ctx(void *app_ctx, void *log_ctx);
++
++/*
++ * Get the Android application context that has been set with
++ * av_jni_set_android_app_ctx.
++ *
++ * @return a pointer the the Android application context
++ */
++void *av_jni_get_android_app_ctx(void);
++
+ #endif /* AVCODEC_JNI_H */
+-- 
+2.44.0
+