refactor: 重构 ffmpeg 编码器探测模块

src/video/encoder/mod.rs

@@ -3,12 +3,15 @@
 //! This module provides video encoding capabilities including:
 //! - JPEG encoding for raw frames (YUYV, NV12, etc.)
 //! - H264 encoding (hardware + software)
-//! - H265 encoding (hardware only)
-//! - VP8 encoding (hardware only - VAAPI)
-//! - VP9 encoding (hardware only - VAAPI)
+//! - H265 encoding (hardware + software)
+//! - VP8 encoding (hardware + software)
+//! - VP9 encoding (hardware + software)
 //! - WebRTC video codec abstraction
 //! - Encoder registry for automatic detection
 
+use hwcodec::common::DataFormat;
+use hwcodec::ffmpeg_ram::CodecInfo;
+
 pub mod codec;
 pub mod h264;
 pub mod h265;
@@ -32,14 +35,45 @@ pub use registry::{AvailableEncoder, EncoderBackend, EncoderRegistry, VideoEncod
 // H264 encoder
 pub use h264::{H264Config, H264Encoder, H264EncoderType, H264InputFormat};
 
-// H265 encoder (hardware only)
+// H265 encoder
 pub use h265::{H265Config, H265Encoder, H265EncoderType, H265InputFormat};
 
-// VP8 encoder (hardware only)
+// VP8 encoder
 pub use vp8::{VP8Config, VP8Encoder, VP8EncoderType, VP8InputFormat};
 
-// VP9 encoder (hardware only)
+// VP9 encoder
 pub use vp9::{VP9Config, VP9Encoder, VP9EncoderType, VP9InputFormat};
 
 // JPEG encoder
 pub use jpeg::JpegEncoder;
+
+pub(crate) fn select_codec_for_format<F>(
+    encoders: &[CodecInfo],
+    format: DataFormat,
+    preferred: F,
+) -> Option<&CodecInfo>
+where
+    F: Fn(&CodecInfo) -> bool,
+{
+    encoders
+        .iter()
+        .find(|codec| codec.format == format && preferred(codec))
+        .or_else(|| encoders.iter().find(|codec| codec.format == format))
+}
+
+pub(crate) fn detect_best_codec_for_format<T, F>(
+    encoders: &[CodecInfo],
+    format: DataFormat,
+    preferred: F,
+) -> Option<(T, String)>
+where
+    T: From<EncoderBackend>,
+    F: Fn(&CodecInfo) -> bool,
+{
+    select_codec_for_format(encoders, format, preferred).map(|codec| {
+        (
+            T::from(EncoderBackend::from_codec_name(&codec.name)),
+            codec.name.clone(),
+        )
+    })
+}