Add function to read or set FFmpeg logging level

Author: scriptorian

package.json

@@ -1,6 +1,6 @@
 {
   "name": "beamcoder",
-  "version": "0.6.6",
+  "version": "0.6.7",
   "description": "Node.js native bindings to FFmpeg.",
   "main": "index.js",
   "types": "index.d.ts",

src/beamcoder.cc

@@ -252,6 +252,59 @@ napi_value licenses(napi_env env, napi_callback_info info) {
   return result;
 }
 
+napi_value logging(napi_env env, napi_callback_info info) {
+  napi_status status;
+  napi_value result;
+  int logLevel;
+  char* logLevelStr;
+  size_t strLen;
+
+  napi_value args[1];
+  size_t argc = 1;
+  status = napi_get_cb_info(env, info, &argc, args, nullptr, nullptr);
+  CHECK_STATUS;
+
+  if (argc == 0) {
+    logLevel = av_log_get_level();
+    status = napi_create_string_utf8(env,
+      (char*) beam_lookup_name(beam_logging_level->forward, logLevel),
+      NAPI_AUTO_LENGTH, &result);
+    CHECK_STATUS;
+  } else {
+    if (argc != 1) {
+      status = napi_throw_error(env, nullptr, "Wrong number of arguments to set log level.");
+      return nullptr;
+    }
+
+    napi_value params = args[0];
+    napi_valuetype t;
+    status = napi_typeof(env, params, &t);
+    CHECK_STATUS;
+    if (t != napi_string) {
+      status = napi_throw_type_error(env, nullptr, "Logging level parameter must be a string.");
+      return nullptr;
+    }
+
+    status = napi_get_value_string_utf8(env, args[0], nullptr, 0, &strLen);
+    CHECK_STATUS;
+    logLevelStr = (char*) malloc(sizeof(char) * (strLen + 1));
+    CHECK_STATUS;
+    status = napi_get_value_string_utf8(env, args[0], logLevelStr, strLen + 1, &strLen);
+    CHECK_STATUS;
+
+    logLevel = beam_lookup_enum(beam_logging_level->inverse, logLevelStr);
+    if (logLevel == BEAM_ENUM_UNKNOWN) {
+      NAPI_THROW_ERROR("Logging level string unrecognised");
+    }
+    av_log_set_level(logLevel);
+
+    status = napi_get_undefined(env, &result);
+    CHECK_STATUS;
+  }
+
+  return result;
+}
+
 napi_status fromAVCodec(napi_env env, const AVCodec* codec, napi_value *result) {
   napi_status status;
   napi_value array, element, subel, value, props, nullval;
@@ -890,11 +943,12 @@ napi_value Init(napi_env env, napi_value exports) {
     DECLARE_NAPI_METHOD("versionStrings", versionStrings),
     DECLARE_NAPI_METHOD("configurations", configurations),
     DECLARE_NAPI_METHOD("licenses", licenses),
+    DECLARE_NAPI_METHOD("logging", logging),
     DECLARE_NAPI_METHOD("governor", governor),
     DECLARE_NAPI_METHOD("format", makeFormat),
     DECLARE_NAPI_METHOD("decoder", decoder),
-    DECLARE_NAPI_METHOD("filterer", filterer),
-    DECLARE_NAPI_METHOD("encoder", encoder), // 10
+    DECLARE_NAPI_METHOD("filterer", filterer), // 10
+    DECLARE_NAPI_METHOD("encoder", encoder),
     DECLARE_NAPI_METHOD("codecs", codecs),
     DECLARE_NAPI_METHOD("decoders", decoders),
     DECLARE_NAPI_METHOD("encoders", encoders),
@@ -903,8 +957,8 @@ napi_value Init(napi_env env, napi_value exports) {
     DECLARE_NAPI_METHOD("pix_fmts", pix_fmts),
     DECLARE_NAPI_METHOD("sample_fmts", sampleFormats),
     DECLARE_NAPI_METHOD("protocols", protocols),
-    DECLARE_NAPI_METHOD("filters", filters),
-    DECLARE_NAPI_METHOD("bsfs", bsfs), // 20
+    DECLARE_NAPI_METHOD("filters", filters), // 20
+    DECLARE_NAPI_METHOD("bsfs", bsfs),
     DECLARE_NAPI_METHOD("packet", makePacket),
     DECLARE_NAPI_METHOD("frame", makeFrame),
     DECLARE_NAPI_METHOD("codecParameters", makeCodecParameters),
@@ -916,7 +970,7 @@ napi_value Init(napi_env env, napi_value exports) {
     { "AV_NOPTS_VALUE", nullptr, nullptr, nullptr, nullptr,
       noopts, napi_enumerable, nullptr }
   };
-  status = napi_define_properties(env, exports, 28, desc);
+  status = napi_define_properties(env, exports, 29, desc);
   CHECK_STATUS;
 
   avdevice_register_all();

src/beamcoder_util.cc

@@ -1129,3 +1129,16 @@ std::unordered_map<int, std::string> beam_frame_side_data_type_fmap = {
   { AV_FRAME_DATA_S12M_TIMECODE, "s12m_timecode" }
 };
 const beamEnum* beam_frame_side_data_type = new beamEnum(beam_frame_side_data_type_fmap);
+
+std::unordered_map<int, std::string> beam_logging_level_fmap = {
+  { AV_LOG_QUIET, "quiet" },
+  { AV_LOG_PANIC, "panic" },
+  { AV_LOG_FATAL, "fatal" },
+  { AV_LOG_ERROR, "error" },
+  { AV_LOG_WARNING, "warning" },
+  { AV_LOG_INFO, "info" },
+  { AV_LOG_VERBOSE, "verbose" },
+  { AV_LOG_DEBUG, "debug" },
+  { AV_LOG_TRACE, "trace" }
+};
+const beamEnum* beam_logging_level = new beamEnum(beam_logging_level_fmap);

src/beamcoder_util.h

@@ -186,6 +186,7 @@ extern const beamEnum* beam_avoid_neg_ts;
 extern const beamEnum* beam_avfmt_duration2;
 extern const beamEnum* beam_packet_side_data_type;
 extern const beamEnum* beam_frame_side_data_type;
+extern const beamEnum* beam_logging_level;
 
 napi_value makeFrame(napi_env env, napi_callback_info info);