output/recorder, test/*: invoke encoder_read() after _open()

Make sure the file header gets written at the beginning, before
_write() gets called.

src/encoder_plugin.h

@@ -119,6 +119,10 @@ encoder_finish(struct encoder *encoder)
  * Before you free it, you must call encoder_close().  You may open
  * and close (reuse) one encoder any number of times.
  *
+ * After this function returns successfully and before the first
+ * encoder_write() call, you should invoke encoder_read() to obtain
+ * the file header.
+ *
  * @param encoder the encoder
  * @param audio_format the encoder's input audio format; the plugin
  * may modify the struct to adapt it to its abilities

src/output/recorder_output_plugin.c

@@ -192,6 +192,13 @@ recorder_output_open(struct audio_output *ao,
 		return false;
 	}
 
+	if (!recorder_output_encoder_to_file(recorder, error_r)) {
+		encoder_close(recorder->encoder);
+		close(recorder->fd);
+		unlink(recorder->path);
+		return false;
+	}
+
 	return true;
 }
 

test/run_encoder.c

@@ -106,6 +106,8 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
+	encoder_to_stdout(encoder);
+
 	/* do it */
 
 	while ((nbytes = read(0, buffer, sizeof(buffer))) > 0) {

test/test_vorbis_encoder.c

@@ -67,6 +67,8 @@ main(G_GNUC_UNUSED int argc, G_GNUC_UNUSED char **argv)
 	success = encoder_open(encoder, &audio_format, NULL);
 	assert(success);
 
+	encoder_to_stdout(encoder);
+
 	/* write a block of data */
 
 	success = encoder_write(encoder, zero, sizeof(zero), NULL);