mirror of
https://github.com/Droid-Deck/DroidDeck.git
synced 2026-11-11 02:51:10 +00:00
maxjivi05
916a39585f
Steam's arm64 streaming_client only decodes through a V4L2 stateful decoder and libdrm dumb buffers, neither of which exist on Android, so streams from a PC never showed a picture. The preload now offers it a /dev/video-dec0 and a libdrm stand-in backed by dma-heap buffers, and each frame is decoded by the app's MediaCodec (Qualcomm low-latency mode) over the encoder socket, falling back to the FFmpeg in Steam's runtime.
100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* Ported from WinNative (maxjivi05, feature/wayland-gamescope, 2026-09-18/19), GPL-3.0.
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*/
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <string.h>
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#include <sys/types.h>
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int bl_status_without_tracer(const char *path, int flags, const void *caller) __attribute__((visibility("hidden")));
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int bl_writable_retry(int dirfd, const char *path, int flags) __attribute__((visibility("hidden")));
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int bl_ntsync_open(const char *path, int flags) __attribute__((visibility("hidden")));
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int bl_venc_open(const char *path, int flags) __attribute__((visibility("hidden")));
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int bl_vdec_open(const char *path, int flags) __attribute__((visibility("hidden")));
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int bl_dircache_create(int dirfd, const char *path, int flags, mode_t mode,
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int (*real)(int, const char *, int, mode_t)) __attribute__((visibility("hidden")));
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static int (*real_open)(const char *, int, ...);
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static int (*real_openat)(int, const char *, int, ...);
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static int via_open(int dirfd, const char *path, int flags, mode_t mode) {
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(void)dirfd;
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return real_open(path, flags, mode);
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}
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static int via_openat(int dirfd, const char *path, int flags, mode_t mode) {
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return real_openat(dirfd, path, flags, mode);
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}
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static int retry_without_noatime(int fd, int flags) {
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return fd < 0 && errno == EPERM && (flags & O_NOATIME);
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}
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static int is_trace_marker(const char *path) {
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return path != NULL
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&& (strcmp(path, "/sys/kernel/tracing/trace_marker") == 0
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|| strcmp(path, "/sys/kernel/debug/tracing/trace_marker") == 0);
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}
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int open(const char *path, int flags, ...) {
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va_list ap;
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mode_t mode;
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int fd;
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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if (is_trace_marker(path)) {
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errno = EACCES;
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return -1;
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}
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if ((fd = bl_status_without_tracer(path, flags, __builtin_return_address(0))) >= 0) return fd;
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if ((fd = bl_ntsync_open(path, flags)) != -2) return fd;
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if ((fd = bl_venc_open(path, flags)) != -2) return fd;
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if ((fd = bl_vdec_open(path, flags)) != -2) return fd;
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if (real_open == NULL) real_open = dlsym(RTLD_NEXT, "open");
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if (real_open == NULL) {
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errno = ENOSYS;
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return -1;
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}
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fd = bl_dircache_create(AT_FDCWD, path, flags, mode, via_open);
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if (retry_without_noatime(fd, flags)) fd = real_open(path, flags & ~O_NOATIME, mode);
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if (fd < 0 && bl_writable_retry(AT_FDCWD, path, flags)) fd = real_open(path, flags & ~O_NOATIME, mode);
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return fd;
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}
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int openat(int dirfd, const char *path, int flags, ...) {
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va_list ap;
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mode_t mode;
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int fd;
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va_start(ap, flags);
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mode = va_arg(ap, mode_t);
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va_end(ap);
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if (is_trace_marker(path)) {
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errno = EACCES;
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return -1;
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}
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if ((fd = bl_status_without_tracer(path, flags, __builtin_return_address(0))) >= 0) return fd;
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if ((fd = bl_ntsync_open(path, flags)) != -2) return fd;
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if ((fd = bl_venc_open(path, flags)) != -2) return fd;
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if ((fd = bl_vdec_open(path, flags)) != -2) return fd;
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if (real_openat == NULL) real_openat = dlsym(RTLD_NEXT, "openat");
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if (real_openat == NULL) {
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errno = ENOSYS;
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return -1;
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}
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fd = bl_dircache_create(dirfd, path, flags, mode, via_openat);
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if (retry_without_noatime(fd, flags)) fd = real_openat(dirfd, path, flags & ~O_NOATIME, mode);
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if (fd < 0 && bl_writable_retry(dirfd, path, flags)) fd = real_openat(dirfd, path, flags & ~O_NOATIME, mode);
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return fd;
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}
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int open64(const char *path, int flags, ...) __attribute__((alias("open")));
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int openat64(int dirfd, const char *path, int flags, ...) __attribute__((alias("openat")));
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