encoderd: fix crash when filename is null (#29748)

Use publish_name for thread name and debugging messages

system/loggerd/encoder/ffmpeg_encoder.cc

@@ -135,7 +135,7 @@ int FfmpegEncoder::encode_frame(VisionBuf* buf, VisionIpcBufExtra *extra) {
     }
 
     if (env_debug_encoder) {
-      printf("%20s got %8d bytes flags %8x idx %4d id %8d\n", encoder_info.filename, pkt.size, pkt.flags, counter, extra->frame_id);
+      printf("%20s got %8d bytes flags %8x idx %4d id %8d\n", encoder_info.publish_name, pkt.size, pkt.flags, counter, extra->frame_id);
     }
 
     publisher_publish(this, segment_num, counter, *extra,

system/loggerd/encoder/v4l_encoder.cc

@@ -75,7 +75,7 @@ static void request_buffers(int fd, v4l2_buf_type buf_type, unsigned int count)
 }
 
 void V4LEncoder::dequeue_handler(V4LEncoder *e) {
-  std::string dequeue_thread_name = "dq-"+std::string(e->encoder_info.filename);
+  std::string dequeue_thread_name = "dq-"+std::string(e->encoder_info.publish_name);
   util::set_thread_name(dequeue_thread_name.c_str());
 
   e->segment_num++;
@@ -105,7 +105,7 @@ void V4LEncoder::dequeue_handler(V4LEncoder *e) {
     }
 
     if (env_debug_encoder >= 2) {
-      printf("%20s poll %x at %.2f ms\n", e->encoder_info.filename, pfd.revents, millis_since_boot());
+      printf("%20s poll %x at %.2f ms\n", e->encoder_info.publish_name, pfd.revents, millis_since_boot());
     }
 
     int frame_id = -1;
@@ -133,7 +133,7 @@ void V4LEncoder::dequeue_handler(V4LEncoder *e) {
 
       if (env_debug_encoder) {
         printf("%20s got(%d) %6d bytes flags %8x idx %3d/%4d id %8d ts %ld lat %.2f ms (%lu frames free)\n",
-          e->encoder_info.filename, index, bytesused, flags, e->segment_num, idx, frame_id, ts, millis_since_boot()-(ts/1000.), e->free_buf_in.size());
+          e->encoder_info.publish_name, index, bytesused, flags, e->segment_num, idx, frame_id, ts, millis_since_boot()-(ts/1000.), e->free_buf_in.size());
       }
 
       // requeue the buffer

system/loggerd/loggerd.cc

@@ -116,6 +116,7 @@ int handle_encoder_msg(LoggerdState *s, Message *msg, std::string &name, struct
         }
         // if we aren't actually recording, don't create the writer
         if (encoder_info.record) {
+          assert(encoder_info.filename != NULL);
           re.writer.reset(new VideoWriter(s->segment_path,
             encoder_info.filename, idx.getType() != cereal::EncodeIndex::Type::FULL_H_E_V_C,
             encoder_info.frame_width, encoder_info.frame_height, encoder_info.fps, idx.getType()));