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impement android.media.MediaCodec using libavcodec

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The current implementation requires a VA-API driver and a Wayland
compositor with YUV-buffer support. GNOME supports YUV-buffers
since the recent version 45 release
This commit is contained in:
Julian Winkler
2023-10-08 16:09:27 +02:00
parent 23c0b006ef
commit b340032e9f
13 changed files with 834 additions and 13 deletions
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40
src/api-impl-jni/util.c
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@@ -1,7 +1,9 @@
#include <stdint.h>
#include <dlfcn.h>
#include <pthread.h>
#include "util.h"
#include "src/api-impl-jni/defines.h"
struct handle_cache handle_cache = {0};
@@ -193,3 +195,41 @@ int android_log_printf(android_LogPriority prio, const char *tag, const char *fm
return ret;
}
void *get_nio_buffer(JNIEnv *env, jobject buffer, jarray *array_ref, jbyte **array) {
jclass class;
void *pointer;
int elementSizeShift, position;
if (!buffer) {
*array_ref = NULL;
return NULL;
}
class = _CLASS(buffer);
pointer = _PTR((*env)->GetLongField(env, buffer, _FIELD_ID(class, "address", "J")));
elementSizeShift = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "_elementSizeShift", "I"));
position = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "position", "I"));
if (pointer) { // buffer is direct
*array_ref = NULL;
pointer += position << elementSizeShift;
} else { // buffer is indirect
*array_ref = (*env)->CallObjectMethod(env, buffer, _METHOD(class, "array", "()Ljava/lang/Object;"));
pointer = *array = (*env)->GetPrimitiveArrayCritical(env, *array_ref, NULL);
jint offset = (*env)->CallIntMethod(env, buffer, _METHOD(class, "arrayOffset", "()I"));
pointer += (offset + position) << elementSizeShift;
}
return pointer;
}
void release_nio_buffer(JNIEnv *env, jarray array_ref, jbyte *array) {
if (array_ref)
(*env)->ReleasePrimitiveArrayCritical(env, array_ref, array, 0);
}
int get_nio_buffer_size(JNIEnv *env, jobject buffer) {
jclass class = _CLASS(buffer);;
int limit = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "limit", "I"));
int position = (*env)->GetIntField(env, buffer, _FIELD_ID(class, "position", "I"));
return limit - position;
}