feat: Media decoder and fetcher options in the MDC (#4094)

Signed-off-by: Alexandre Milesi <milesial@users.noreply.github.com>

lib/bindings/python/rust/lib.rs

@@ -39,6 +39,7 @@ use dynamo_llm::{self as llm_rs};
 use dynamo_llm::{entrypoint::RouterConfig, kv_router::KvRouterConfig};
 
 use crate::llm::local_model::ModelRuntimeConfig;
+use crate::llm::preprocessor::{MediaDecoder, MediaFetcher};
 
 #[pyclass(eq, eq_int)]
 #[derive(Clone, Debug, PartialEq)]
@@ -161,6 +162,8 @@ fn _core(m: &Bound<'_, PyModule>) -> PyResult<()> {
     m.add_class::<llm::model_card::ModelDeploymentCard>()?;
     m.add_class::<llm::local_model::ModelRuntimeConfig>()?;
     m.add_class::<llm::preprocessor::OAIChatPreprocessor>()?;
+    m.add_class::<llm::preprocessor::MediaDecoder>()?;
+    m.add_class::<llm::preprocessor::MediaFetcher>()?;
     m.add_class::<llm::backend::Backend>()?;
     m.add_class::<llm::kv::OverlapScores>()?;
     m.add_class::<llm::kv::KvIndexer>()?;
@@ -217,7 +220,7 @@ fn log_message(level: &str, message: &str, module: &str, file: &str, line: u32)
 /// Create an engine and attach it to an endpoint to make it visible to the frontend.
 /// This is the main way you create a Dynamo worker / backend.
 #[pyfunction]
-#[pyo3(signature = (model_input, model_type, endpoint, model_path, model_name=None, context_length=None, kv_cache_block_size=None, router_mode=None, migration_limit=0, runtime_config=None, user_data=None, custom_template_path=None))]
+#[pyo3(signature = (model_input, model_type, endpoint, model_path, model_name=None, context_length=None, kv_cache_block_size=None, router_mode=None, migration_limit=0, runtime_config=None, user_data=None, custom_template_path=None, media_decoder=None, media_fetcher=None))]
 #[allow(clippy::too_many_arguments)]
 fn register_llm<'p>(
     py: Python<'p>,
@@ -233,6 +236,8 @@ fn register_llm<'p>(
     runtime_config: Option<ModelRuntimeConfig>,
     user_data: Option<&Bound<'p, PyDict>>,
     custom_template_path: Option<&str>,
+    media_decoder: Option<MediaDecoder>,
+    media_fetcher: Option<MediaFetcher>,
 ) -> PyResult<Bound<'p, PyAny>> {
     // Validate Prefill model type requirements
     if model_type.inner == llm_rs::model_type::ModelType::Prefill {
@@ -305,7 +310,9 @@ fn register_llm<'p>(
             .migration_limit(Some(migration_limit))
             .runtime_config(runtime_config.unwrap_or_default().inner)
             .user_data(user_data_json)
-            .custom_template_path(custom_template_path_owned);
+            .custom_template_path(custom_template_path_owned)
+            .media_decoder(media_decoder.map(|m| m.inner))
+            .media_fetcher(media_fetcher.map(|m| m.inner));
         // Load the ModelDeploymentCard
         let mut local_model = builder.build().await.map_err(to_pyerr)?;
         // Advertise ourself on etcd so ingress can find us

lib/bindings/python/rust/llm/preprocessor.rs

@@ -3,9 +3,11 @@
 
 use super::*;
 use crate::llm::model_card::ModelDeploymentCard;
+use std::time::Duration;
 
 use llm_rs::{
     preprocessor::OpenAIPreprocessor,
+    preprocessor::media::{MediaDecoder as RsMediaDecoder, MediaFetcher as RsMediaFetcher},
     protocols::common::llm_backend::{BackendOutput, PreprocessedRequest},
     types::{
         Annotated,
@@ -74,3 +76,62 @@ impl OAIChatPreprocessor {
         })
     }
 }
+
+#[pyclass]
+#[derive(Clone)]
+pub struct MediaDecoder {
+    pub(crate) inner: RsMediaDecoder,
+}
+
+#[pymethods]
+impl MediaDecoder {
+    #[new]
+    fn new() -> Self {
+        Self {
+            inner: RsMediaDecoder::default(),
+        }
+    }
+
+    fn image_decoder(&mut self, image_decoder: &Bound<'_, PyDict>) -> PyResult<()> {
+        let image_decoder = pythonize::depythonize(image_decoder).map_err(|err| {
+            PyErr::new::<PyException, _>(format!("Failed to parse image_decoder: {}", err))
+        })?;
+        self.inner.image_decoder = image_decoder;
+        Ok(())
+    }
+}
+
+#[pyclass]
+#[derive(Clone)]
+pub struct MediaFetcher {
+    pub(crate) inner: RsMediaFetcher,
+}
+
+#[pymethods]
+impl MediaFetcher {
+    #[new]
+    fn new() -> Self {
+        Self {
+            inner: RsMediaFetcher::default(),
+        }
+    }
+    fn user_agent(&mut self, user_agent: String) {
+        self.inner.user_agent = user_agent;
+    }
+
+    fn allow_direct_ip(&mut self, allow: bool) {
+        self.inner.allow_direct_ip = allow;
+    }
+
+    fn allow_direct_port(&mut self, allow: bool) {
+        self.inner.allow_direct_port = allow;
+    }
+
+    fn allowed_media_domains(&mut self, domains: Vec<String>) {
+        self.inner.allowed_media_domains = Some(domains.into_iter().collect());
+    }
+
+    fn timeout_ms(&mut self, timeout_ms: u64) {
+        self.inner.timeout = Some(Duration::from_millis(timeout_ms));
+    }
+}

lib/bindings/python/src/dynamo/llm/__init__.py

@@ -18,6 +18,8 @@ from dynamo._core import KvPushRouter as KvPushRouter
 from dynamo._core import KvRecorder as KvRecorder
 from dynamo._core import KvRouterConfig as KvRouterConfig
 from dynamo._core import KvStats as KvStats
+from dynamo._core import MediaDecoder as MediaDecoder
+from dynamo._core import MediaFetcher as MediaFetcher
 from dynamo._core import ModelInput as ModelInput
 from dynamo._core import ModelRuntimeConfig as ModelRuntimeConfig
 from dynamo._core import ModelType as ModelType

lib/llm/src/local_model.rs

@@ -14,6 +14,7 @@ use crate::entrypoint::RouterConfig;
 use crate::mocker::protocols::MockEngineArgs;
 use crate::model_card::{self, ModelDeploymentCard};
 use crate::model_type::{ModelInput, ModelType};
+use crate::preprocessor::media::{MediaDecoder, MediaFetcher};
 use crate::request_template::RequestTemplate;
 
 pub mod runtime_config;
@@ -52,6 +53,8 @@ pub struct LocalModelBuilder {
     namespace: Option<String>,
     custom_backend_metrics_endpoint: Option<String>,
     custom_backend_metrics_polling_interval: Option<f64>,
+    media_decoder: Option<MediaDecoder>,
+    media_fetcher: Option<MediaFetcher>,
 }
 
 impl Default for LocalModelBuilder {
@@ -77,6 +80,8 @@ impl Default for LocalModelBuilder {
             namespace: Default::default(),
             custom_backend_metrics_endpoint: Default::default(),
             custom_backend_metrics_polling_interval: Default::default(),
+            media_decoder: Default::default(),
+            media_fetcher: Default::default(),
         }
     }
 }
@@ -184,6 +189,16 @@ impl LocalModelBuilder {
         self
     }
 
+    pub fn media_decoder(&mut self, media_decoder: Option<MediaDecoder>) -> &mut Self {
+        self.media_decoder = media_decoder;
+        self
+    }
+
+    pub fn media_fetcher(&mut self, media_fetcher: Option<MediaFetcher>) -> &mut Self {
+        self.media_fetcher = media_fetcher;
+        self
+    }
+
     /// Make an LLM ready for use:
     /// - Download it from Hugging Face (and NGC in future) if necessary
     /// - Resolve the path
@@ -219,6 +234,8 @@ impl LocalModelBuilder {
             self.runtime_config.max_num_batched_tokens =
                 mocker_engine_args.max_num_batched_tokens.map(|v| v as u64);
             self.runtime_config.data_parallel_size = mocker_engine_args.dp_size;
+            self.media_decoder = Some(MediaDecoder::default());
+            self.media_fetcher = Some(MediaFetcher::default());
         }
 
         // frontend and echo engine don't need a path.
@@ -230,6 +247,8 @@ impl LocalModelBuilder {
             card.migration_limit = self.migration_limit;
             card.user_data = self.user_data.take();
             card.runtime_config = self.runtime_config.clone();
+            card.media_decoder = self.media_decoder.clone();
+            card.media_fetcher = self.media_fetcher.clone();
 
             return Ok(LocalModel {
                 card,
@@ -280,6 +299,8 @@ impl LocalModelBuilder {
         card.migration_limit = self.migration_limit;
         card.user_data = self.user_data.take();
         card.runtime_config = self.runtime_config.clone();
+        card.media_decoder = self.media_decoder.clone();
+        card.media_fetcher = self.media_fetcher.clone();
 
         Ok(LocalModel {
             card,

lib/llm/src/model_card.rs

@@ -25,6 +25,7 @@ use dynamo_runtime::{slug::Slug, storage::key_value_store::Versioned};
 use serde::{Deserialize, Serialize};
 use tokenizers::Tokenizer as HfTokenizer;
 
+use crate::preprocessor::media::{MediaDecoder, MediaFetcher};
 use crate::protocols::TokenIdType;
 
 /// Identify model deployment cards in the key-value store
@@ -217,6 +218,14 @@ pub struct ModelDeploymentCard {
     #[serde(default)]
     pub runtime_config: ModelRuntimeConfig,
 
+    /// Media decoding configuration
+    #[serde(default)]
+    pub media_decoder: Option<MediaDecoder>,
+
+    /// Media fetching configuration
+    #[serde(default)]
+    pub media_fetcher: Option<MediaFetcher>,
+
     #[serde(skip, default)]
     checksum: OnceLock<String>,
 }
@@ -520,6 +529,8 @@ impl ModelDeploymentCard {
             model_input: Default::default(), // set later
             user_data: None,
             runtime_config: ModelRuntimeConfig::default(),
+            media_decoder: None,
+            media_fetcher: None,
             checksum: OnceLock::new(),
         })
     }

lib/llm/src/preprocessor/media.rs

@@ -7,4 +7,4 @@ mod loader;
 
 pub use common::EncodedMediaData;
 pub use decoders::{Decoder, ImageDecoder, MediaDecoder};
-pub use loader::MediaLoader;
+pub use loader::{MediaFetcher, MediaLoader};