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// This file tracks sleek's copy in `android/src` closely enough that a fix can
// be moved between the two by eye, so it is deliberately not idiomatised to
// this workspace's clippy settings. The lints below are the ones that would
// rewrite it away from its original; everything else still applies.
#![allow(
clippy::chunks_exact_to_as_chunks,
clippy::identity_op,
clippy::manual_filter,
clippy::manual_is_multiple_of,
clippy::redundant_closure,
clippy::too_many_arguments,
clippy::unnecessary_sort_by
)]
//! Android Camera2 → MoQ video publish bridge.
//!
//! Java `CameraCapture` (in APK `classes.dex`) opens Camera2 / ImageReader and
//! calls native NV12 push methods implemented here. Frames land in a
//! latest-only [`PushCameraSource`] that implements iroh-live's [`VideoSource`].
//!
//! JNI note: never resolve `CameraCapture` with `Env::find_class` from a
//! native worker thread — that uses the system ClassLoader and misses APK
//! classes. Use [`android_jni::load_app_class`] (Activity ClassLoader).
//!
//! The `JavaVM` and the Activity come from [`crate::android_jni`], which the
//! glue fills in before a call can start — see the note there for why they
//! arrive by hand rather than out of `ndk_context`.
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::{Arc, Mutex, OnceLock};
use std::time::Duration;
use anyhow::{anyhow, Context, Result};
use iroh_live::media::{
format::{Nv12Planes, PixelFormat, VideoFormat, VideoFrame},
traits::VideoSource,
};
use crate::android_jni;
/// Java binary name for the Camera2 helper in APK `classes.dex`.
const CAMERA_CAPTURE_CLASS: &str = "uk.nandi.frq.CameraCapture";
/// What every camera call says when the glue never handed the handles over —
/// an APK packaging `libjoltmoq.so` but not calling `joltmoq_android_init`.
const NOT_INITIALISED: &str = "joltmoq_android_init has not run";
/// Shared sink written by JNI and read by the encoder thread.
struct FrameSink {
pending: Mutex<Option<VideoFrame>>,
format: Mutex<VideoFormat>,
/// Set true after Java reports the capture session is live.
opened: AtomicBool,
/// Last open error detail (empty when ok / idle).
last_error: Mutex<String>,
frames_pushed: AtomicU64,
}
impl FrameSink {
fn new(width: u32, height: u32) -> Self {
Self {
pending: Mutex::new(None),
format: Mutex::new(VideoFormat {
// Encoders that receive FrameData::Nv12 ignore this field;
// keep Rgba as the VideoFormat default (rusty-codecs has no Nv12 variant).
pixel_format: PixelFormat::Rgba,
dimensions: [width, height],
}),
opened: AtomicBool::new(false),
last_error: Mutex::new(String::new()),
frames_pushed: AtomicU64::new(0),
}
}
}
static SINK: OnceLock<Arc<FrameSink>> = OnceLock::new();
fn sink() -> Arc<FrameSink> {
SINK.get_or_init(|| Arc::new(FrameSink::new(640, 480)))
.clone()
}
/// Latest-frame-only [`VideoSource`] fed by Camera2 JNI callbacks.
pub struct PushCameraSource {
sink: Arc<FrameSink>,
name: String,
}
impl PushCameraSource {
pub fn new(label: impl Into<String>) -> Self {
Self {
sink: sink(),
name: label.into(),
}
}
}
impl VideoSource for PushCameraSource {
fn name(&self) -> &str {
&self.name
}
fn format(&self) -> VideoFormat {
self.sink
.format
.lock()
.map(|g| g.clone())
.unwrap_or(VideoFormat {
pixel_format: PixelFormat::Rgba,
dimensions: [640, 480],
})
}
fn pop_frame(&mut self) -> Result<Option<VideoFrame>> {
Ok(self.sink.pending.lock().ok().and_then(|mut g| g.take()))
}
fn start(&mut self) -> Result<()> {
Ok(())
}
fn stop(&mut self) -> Result<()> {
if let Ok(mut g) = self.sink.pending.lock() {
*g = None;
}
Ok(())
}
}
/// Enumerate cameras for the device picker (front first).
/// Returns `(id, label)` pairs.
pub fn list_cameras() -> Vec<(String, String)> {
match list_cameras_jni() {
Ok(list) => list,
Err(e) => {
// Warn: empty list makes AV report "camera unavailable" permanently.
log::warn!("android camera list: {e}");
Vec::new()
}
}
}
fn list_cameras_jni() -> Result<Vec<(String, String)>> {
let vm = android_jni::vm().context(NOT_INITIALISED)?;
let activity_ptr = android_jni::activity().context(NOT_INITIALISED)?;
use jni::objects::{JObject, JObjectArray, JString, JValue};
use jni::refs::Global;
use jni::{jni_sig, jni_str};
let mut out: Option<Result<Vec<(String, String)>>> = None;
vm.attach_current_thread(|env| -> jni::errors::Result<()> {
let activity = unsafe { env.as_cast_raw::<Global<JObject>>(&activity_ptr)? };
let cls = match android_jni::load_app_class(env, activity.as_ref(), CAMERA_CAPTURE_CLASS) {
Ok(c) => c,
Err(e) => {
out = Some(Err(anyhow!("CameraCapture class: {e}")));
return Ok(());
}
};
let arr_obj = env
.call_static_method(
&cls,
jni_str!("listCameras"),
jni_sig!((android.content.Context) -> [java.lang.String]),
&[JValue::Object(activity.as_ref())],
)?
.l()?;
let arr = env.cast_local::<JObjectArray>(arr_obj)?;
let n = arr.len(env)?;
let mut list = Vec::with_capacity(n);
for i in 0..n {
let obj = arr.get_element(env, i)?;
if obj.is_null() {
continue;
}
let jstr = env.cast_local::<JString>(obj)?;
let s = format!("{jstr}");
let (id, name) = match s.split_once('\t') {
Some((id, name)) => (id.to_string(), name.to_string()),
None => (s.clone(), s),
};
list.push((id, name));
}
out = Some(Ok(list));
Ok(())
})
.map_err(|e| anyhow!("list cameras JNI: {e}"))?;
out.unwrap_or_else(|| Err(anyhow!("list cameras JNI: no result")))
}
/// Start Camera2 capture. Returns when the open request is dispatched (session
/// readiness is async — wait with [`wait_until_opened`]).
pub fn start_capture(camera_id: Option<&str>) -> Result<()> {
let s = sink();
s.opened.store(false, Ordering::Relaxed);
s.frames_pushed.store(0, Ordering::Relaxed);
if let Ok(mut e) = s.last_error.lock() {
e.clear();
}
if let Ok(mut p) = s.pending.lock() {
*p = None;
}
let vm = android_jni::vm().context(NOT_INITIALISED)?;
let activity_ptr = android_jni::activity().context(NOT_INITIALISED)?;
use jni::objects::{JObject, JValue};
use jni::refs::Global;
use jni::{jni_sig, jni_str};
let id = camera_id.unwrap_or("").to_string();
let mut start_err: Option<anyhow::Error> = None;
vm.attach_current_thread(|env| -> jni::errors::Result<()> {
let activity = unsafe { env.as_cast_raw::<Global<JObject>>(&activity_ptr)? };
let cls = match android_jni::load_app_class(env, activity.as_ref(), CAMERA_CAPTURE_CLASS) {
Ok(c) => c,
Err(e) => {
start_err = Some(anyhow!("CameraCapture class: {e}"));
return Ok(());
}
};
let jid = env.new_string(&id)?;
env.call_static_method(
&cls,
jni_str!("start"),
jni_sig!((android.app.Activity, java.lang.String) -> void),
&[JValue::Object(activity.as_ref()), JValue::Object(&jid)],
)?;
Ok(())
})
.map_err(|e| anyhow!("CameraCapture.start: {e}"))?;
if let Some(e) = start_err {
return Err(e).context("CameraCapture.start");
}
Ok(())
}
/// Block briefly until Java reports the capture session is live.
pub fn wait_until_opened(timeout: Duration) -> Result<()> {
let s = sink();
let deadline = std::time::Instant::now() + timeout;
while std::time::Instant::now() < deadline {
if s.opened.load(Ordering::Relaxed) {
return Ok(());
}
let err = s
.last_error
.lock()
.ok()
.map(|g| g.clone())
.unwrap_or_default();
if !err.is_empty() {
return Err(anyhow!("camera open failed: {err}"));
}
std::thread::sleep(Duration::from_millis(20));
}
let err = s
.last_error
.lock()
.ok()
.map(|g| g.clone())
.unwrap_or_default();
if s.opened.load(Ordering::Relaxed) {
Ok(())
} else if !err.is_empty() {
Err(anyhow!("camera open failed: {err}"))
} else {
Err(anyhow!("camera open timed out"))
}
}
/// Stop Camera2 capture (idempotent).
pub fn stop_capture() {
let (Some(vm), Some(activity_ptr)) = (android_jni::vm(), android_jni::activity()) else {
return;
};
use jni::objects::{JObject, JValue};
use jni::refs::Global;
use jni::{jni_sig, jni_str};
let _ = vm.attach_current_thread(|env| -> jni::errors::Result<()> {
let activity = unsafe { env.as_cast_raw::<Global<JObject>>(&activity_ptr)? };
let cls = match android_jni::load_app_class(env, activity.as_ref(), CAMERA_CAPTURE_CLASS) {
Ok(c) => c,
Err(e) => {
log::warn!("android camera stop: CameraCapture class: {e}");
return Ok(());
}
};
env.call_static_method(
&cls,
jni_str!("stop"),
jni_sig!((android.app.Activity) -> void),
&[JValue::Object(activity.as_ref())],
)?;
Ok(())
});
let s = sink();
s.opened.store(false, Ordering::Relaxed);
if let Ok(mut p) = s.pending.lock() {
*p = None;
};
}
/// RAII guard that stops Camera2 when the media session ends.
pub struct CameraCaptureGuard;
impl Drop for CameraCaptureGuard {
fn drop(&mut self) {
stop_capture();
log::info!("android camera: capture stopped (guard drop)");
}
}
// ── JNI callbacks from CameraCapture.java ─────────────────────────────────
#[unsafe(no_mangle)]
pub extern "system" fn Java_uk_nandi_frq_CameraCapture_onNv12Frame<'local>(
mut unowned_env: jni::JNIEnv<'local>,
_class: jni::objects::JClass<'local>,
y_data: jni::objects::JByteArray<'local>,
uv_data: jni::objects::JByteArray<'local>,
width: jni::sys::jint,
height: jni::sys::jint,
y_stride: jni::sys::jint,
uv_stride: jni::sys::jint,
rotation_degrees: jni::sys::jint,
) {
if width <= 0 || height <= 0 {
return;
}
let _ = unowned_env
.with_env(|env| -> jni::errors::Result<()> {
let y_bytes = env.convert_byte_array(&y_data)?;
let uv_bytes = env.convert_byte_array(&uv_data)?;
let src_w = width as u32;
let src_h = height as u32;
let rot = if rotation_degrees < 0 {
0
} else {
rotation_degrees as u32
};
// Apply sensor/display orientation so published + preview frames
// are upright (Camera2 ImageReader buffers are sensor-oriented).
let (y_bytes, uv_bytes, w, h, y_str, uv_str) = match crate::nv12_orient::orient_nv12(
&y_bytes,
&uv_bytes,
src_w,
src_h,
y_stride as u32,
uv_stride as u32,
rot,
) {
Some((y, uv, w, h)) => (y, uv, w, h, w, w),
None => (
y_bytes,
uv_bytes,
src_w,
src_h,
y_stride as u32,
uv_stride as u32,
),
};
let frame = VideoFrame::new_nv12(
Nv12Planes {
y_data: y_bytes,
y_stride: y_str,
uv_data: uv_bytes,
uv_stride: uv_str,
width: w,
height: h,
},
Duration::ZERO,
);
let s = sink();
if let Ok(mut fmt) = s.format.lock() {
if fmt.dimensions != [w, h] {
*fmt = VideoFormat {
pixel_format: PixelFormat::Rgba,
dimensions: [w, h],
};
}
}
if let Ok(mut pending) = s.pending.lock() {
*pending = Some(frame);
}
let n = s.frames_pushed.fetch_add(1, Ordering::Relaxed);
if n == 0 {
log::info!(
"android camera: first NV12 frame {w}x{h} (src {src_w}x{src_h} rot={rot})"
);
}
Ok(())
})
.into_outcome();
}
#[unsafe(no_mangle)]
pub extern "system" fn Java_uk_nandi_frq_CameraCapture_onCameraState<'local>(
mut unowned_env: jni::JNIEnv<'local>,
_class: jni::objects::JClass<'local>,
opened: jni::sys::jboolean,
detail: jni::objects::JString<'local>,
) {
let _ = unowned_env
.with_env(|env| -> jni::errors::Result<()> {
let detail_str = format!("{detail}");
let s = sink();
let ok = opened != jni::sys::JNI_FALSE;
s.opened.store(ok, Ordering::Relaxed);
if let Ok(mut e) = s.last_error.lock() {
if ok {
e.clear();
} else {
*e = detail_str.clone();
}
}
if ok {
log::info!("android camera: opened ({detail_str})");
} else {
log::warn!("android camera: not opened ({detail_str})");
}
Ok(())
})
.into_outcome();
}
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