Fix timeout

Author: NicolasHug

src/torchcodec/_core/AVIOContextHolder.cpp

@@ -14,6 +14,7 @@ void AVIOContextHolder::createAVIOContext(
     AVIOWriteFunction write,
     AVIOSeekFunction seek,
     void* heldData,
+    bool isForWriting,
     int bufferSize) {
   TORCH_CHECK(
       bufferSize > 0,
@@ -23,14 +24,18 @@ void AVIOContextHolder::createAVIOContext(
       buffer != nullptr,
       "Failed to allocate buffer of size " + std::to_string(bufferSize));
 
-  TORCH_CHECK(
-      (seek != nullptr) && ((write != nullptr) || (read != nullptr)),
-      "seek method must be defined, and at least one of write or read must be "
-      "defined too");
+  TORCH_CHECK(seek != nullptr, "seek method must be defined");
+
+  if (isForWriting) {
+    TORCH_CHECK(write != nullptr, "write method must be defined for writing");
+  } else {
+    TORCH_CHECK(read != nullptr, "read method must be defined for reading");
+  }
+
   avioContext_.reset(avioAllocContext(
       buffer,
       bufferSize,
-      /*write_flag=*/write != nullptr,
+      /*write_flag=*/isForWriting,
       heldData,
       read,
       write,

src/torchcodec/_core/AVIOContextHolder.h

@@ -51,6 +51,7 @@ class AVIOContextHolder {
       AVIOWriteFunction write,
       AVIOSeekFunction seek,
       void* heldData,
+      bool isForWriting,
       int bufferSize = defaultBufferSize);
 
  private:

src/torchcodec/_core/AVIOFileLikeContext.cpp

@@ -9,25 +9,29 @@
 
 namespace facebook::torchcodec {
 
-AVIOFileLikeContext::AVIOFileLikeContext(
-    py::object fileLike,
-    std::string_view neededMethod)
+AVIOFileLikeContext::AVIOFileLikeContext(py::object fileLike, bool isForWriting)
     : fileLike_{UniquePyObject(new py::object(fileLike))} {
   {
     // TODO: Is it necessary to acquire the GIL here? Is it maybe even
     // harmful? At the moment, this is only called from within a pybind
     // function, and pybind guarantees we have the GIL.
     py::gil_scoped_acquire gil;
-    TORCH_CHECK(
-        py::hasattr(fileLike, neededMethod.data()),
-        "File like object must implement a ",
-        neededMethod,
-        " method.");
+
+    if (isForWriting) {
+      TORCH_CHECK(
+          py::hasattr(fileLike, "write"),
+          "File like object must implement a write method for writing.");
+    } else {
+      TORCH_CHECK(
+          py::hasattr(fileLike, "read"),
+          "File like object must implement a read method for reading.");
+    }
+
     TORCH_CHECK(
         py::hasattr(fileLike, "seek"),
         "File like object must implement a seek method.");
   }
-  createAVIOContext(&read, &write, &seek, &fileLike_);
+  createAVIOContext(&read, &write, &seek, &fileLike_, isForWriting);
 }
 
 int AVIOFileLikeContext::read(void* opaque, uint8_t* buf, int buf_size) {

src/torchcodec/_core/AVIOFileLikeContext.h

@@ -21,9 +21,7 @@ namespace facebook::torchcodec {
 class __attribute__((visibility("default"))) AVIOFileLikeContext
     : public AVIOContextHolder {
  public:
-  explicit AVIOFileLikeContext(
-      py::object fileLike,
-      std::string_view neededMethod);
+  explicit AVIOFileLikeContext(py::object fileLike, bool isForWriting);
 
  private:
   static int read(void* opaque, uint8_t* buf, int buf_size);

src/torchcodec/_core/AVIOTensorContext.cpp

@@ -105,12 +105,14 @@ AVIOFromTensorContext::AVIOFromTensorContext(torch::Tensor data)
   TORCH_CHECK(data.numel() > 0, "data must not be empty");
   TORCH_CHECK(data.is_contiguous(), "data must be contiguous");
   TORCH_CHECK(data.scalar_type() == torch::kUInt8, "data must be kUInt8");
-  createAVIOContext(&read, nullptr, &seek, &tensorContext_);
+  createAVIOContext(
+      &read, nullptr, &seek, &tensorContext_, /*isForWriting=*/false);
 }
 
 AVIOToTensorContext::AVIOToTensorContext()
     : tensorContext_{torch::empty({INITIAL_TENSOR_SIZE}, {torch::kUInt8}), 0} {
-  createAVIOContext(nullptr, &write, &seek, &tensorContext_);
+  createAVIOContext(
+      nullptr, &write, &seek, &tensorContext_, /*isForWriting=*/true);
 }
 
 torch::Tensor AVIOToTensorContext::getOutputTensor() {

src/torchcodec/_core/pybind_ops.cpp

@@ -34,7 +34,7 @@ int64_t create_from_file_like(
   }
 
   auto avioContextHolder =
-      std::make_unique<AVIOFileLikeContext>(file_like, /*neededMethod=*/"read");
+      std::make_unique<AVIOFileLikeContext>(file_like, /*isForWriting=*/false);
 
   SingleStreamDecoder* decoder =
       new SingleStreamDecoder(std::move(avioContextHolder), realSeek);
@@ -61,8 +61,8 @@ void encode_audio_to_file_like(
   audioStreamOptions.bitRate = bit_rate;
   audioStreamOptions.numChannels = num_channels;
 
-  auto avioContextHolder = std::make_unique<AVIOFileLikeContext>(
-      file_like, /*neededMethod=*/"write");
+  auto avioContextHolder =
+      std::make_unique<AVIOFileLikeContext>(file_like, /*isForWriting=*/true);
 
   AudioEncoder encoder(
       samples,